DatabaseSQLTest.php

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<?php
 
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\LikeMatch;
use Wikimedia\Rdbms\Database;
use Wikimedia\TestingAccessWrapper;
use Wikimedia\Rdbms\DBTransactionStateError;
use Wikimedia\Rdbms\DBUnexpectedError;
use Wikimedia\Rdbms\DBTransactionError;
 
class DatabaseSQLTest extends PHPUnit\Framework\TestCase {
 
    use MediaWikiCoversValidator;
    use PHPUnit4And6Compat;
 
    private $database;
 
    protected function setUp() {
        parent::setUp();
        $this->database = new DatabaseTestHelper( __CLASS__, [ 'cliMode' => true ] );
    }
 
    protected function assertLastSql( $sqlText ) {
        $this->assertEquals(
            $sqlText,
            $this->database->getLastSqls()
        );
    }
 
    protected function assertLastSqlDb( $sqlText, DatabaseTestHelper $db ) {
        $this->assertEquals( $sqlText, $db->getLastSqls() );
    }
 
    public function testSelect( $sql, $sqlText ) {
        $this->database->select(
            $sql['tables'],
            $sql['fields'],
            isset( $sql['conds'] ) ? $sql['conds'] : [],
            __METHOD__,
            isset( $sql['options'] ) ? $sql['options'] : [],
            isset( $sql['join_conds'] ) ? $sql['join_conds'] : []
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideSelect() {
        return [
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field', 'alias' => 'field2' ],
                    'conds' => [ 'alias' => 'text' ],
                ],
                "SELECT field,field2 AS alias " .
                    "FROM table " .
                    "WHERE alias = 'text'"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field', 'alias' => 'field2' ],
                    'conds' => 'alias = \'text\'',
                ],
                "SELECT field,field2 AS alias " .
                "FROM table " .
                "WHERE alias = 'text'"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field', 'alias' => 'field2' ],
                    'conds' => [],
                ],
                "SELECT field,field2 AS alias " .
                "FROM table"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field', 'alias' => 'field2' ],
                    'conds' => '',
                ],
                "SELECT field,field2 AS alias " .
                "FROM table"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field', 'alias' => 'field2' ],
                    'conds' => '0', // T188314
                ],
                "SELECT field,field2 AS alias " .
                "FROM table " .
                "WHERE 0"
            ],
            [
                [
                    // 'tables' with space prepended indicates pre-escaped table name
                    'tables' => ' table LEFT JOIN table2',
                    'fields' => [ 'field' ],
                    'conds' => [ 'field' => 'text' ],
                ],
                "SELECT field FROM  table LEFT JOIN table2 WHERE field = 'text'"
            ],
            [
                [
                    // Empty 'tables' is allowed
                    'tables' => '',
                    'fields' => [ 'SPECIAL_QUERY()' ],
                ],
                "SELECT SPECIAL_QUERY()"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field', 'alias' => 'field2' ],
                    'conds' => [ 'alias' => 'text' ],
                    'options' => [ 'LIMIT' => 1, 'ORDER BY' => 'field' ],
                ],
                "SELECT field,field2 AS alias " .
                    "FROM table " .
                    "WHERE alias = 'text' " .
                    "ORDER BY field " .
                    "LIMIT 1"
            ],
            [
                [
                    'tables' => [ 'table', 't2' => 'table2' ],
                    'fields' => [ 'tid', 'field', 'alias' => 'field2', 't2.id' ],
                    'conds' => [ 'alias' => 'text' ],
                    'options' => [ 'LIMIT' => 1, 'ORDER BY' => 'field' ],
                    'join_conds' => [ 't2' => [
                        'LEFT JOIN', 'tid = t2.id'
                    ] ],
                ],
                "SELECT tid,field,field2 AS alias,t2.id " .
                    "FROM table LEFT JOIN table2 t2 ON ((tid = t2.id)) " .
                    "WHERE alias = 'text' " .
                    "ORDER BY field " .
                    "LIMIT 1"
            ],
            [
                [
                    'tables' => [ 'table', 't2' => 'table2' ],
                    'fields' => [ 'tid', 'field', 'alias' => 'field2', 't2.id' ],
                    'conds' => [ 'alias' => 'text' ],
                    'options' => [ 'LIMIT' => 1, 'GROUP BY' => 'field', 'HAVING' => 'COUNT(*) > 1' ],
                    'join_conds' => [ 't2' => [
                        'LEFT JOIN', 'tid = t2.id'
                    ] ],
                ],
                "SELECT tid,field,field2 AS alias,t2.id " .
                    "FROM table LEFT JOIN table2 t2 ON ((tid = t2.id)) " .
                    "WHERE alias = 'text' " .
                    "GROUP BY field HAVING COUNT(*) > 1 " .
                    "LIMIT 1"
            ],
            [
                [
                    'tables' => [ 'table', 't2' => 'table2' ],
                    'fields' => [ 'tid', 'field', 'alias' => 'field2', 't2.id' ],
                    'conds' => [ 'alias' => 'text' ],
                    'options' => [
                        'LIMIT' => 1,
                        'GROUP BY' => [ 'field', 'field2' ],
                        'HAVING' => [ 'COUNT(*) > 1', 'field' => 1 ]
                    ],
                    'join_conds' => [ 't2' => [
                        'LEFT JOIN', 'tid = t2.id'
                    ] ],
                ],
                "SELECT tid,field,field2 AS alias,t2.id " .
                    "FROM table LEFT JOIN table2 t2 ON ((tid = t2.id)) " .
                    "WHERE alias = 'text' " .
                    "GROUP BY field,field2 HAVING (COUNT(*) > 1) AND field = '1' " .
                    "LIMIT 1"
            ],
            [
                [
                    'tables' => [ 'table' ],
                    'fields' => [ 'alias' => 'field' ],
                    'conds' => [ 'alias' => [ 1, 2, 3, 4 ] ],
                ],
                "SELECT field AS alias " .
                    "FROM table " .
                    "WHERE alias IN ('1','2','3','4')"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field' ],
                    'options' => [ 'USE INDEX' => [ 'table' => 'X' ] ],
                ],
                // No-op by default
                "SELECT field FROM table"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field' ],
                    'options' => [ 'IGNORE INDEX' => [ 'table' => 'X' ] ],
                ],
                // No-op by default
                "SELECT field FROM table"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field' ],
                    'options' => [ 'DISTINCT', 'LOCK IN SHARE MODE' ],
                ],
                "SELECT DISTINCT field FROM table      LOCK IN SHARE MODE"
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field' ],
                    'options' => [ 'EXPLAIN' => true ],
                ],
                'EXPLAIN SELECT field FROM table'
            ],
            [
                [
                    'tables' => 'table',
                    'fields' => [ 'field' ],
                    'options' => [ 'FOR UPDATE' ],
                ],
                "SELECT field FROM table      FOR UPDATE"
            ],
        ];
    }
 
    public function testSelectRowCount( $sql, $sqlText ) {
        $this->database->selectRowCount(
            $sql['tables'],
            $sql['field'],
            isset( $sql['conds'] ) ? $sql['conds'] : [],
            __METHOD__,
            isset( $sql['options'] ) ? $sql['options'] : [],
            isset( $sql['join_conds'] ) ? $sql['join_conds'] : []
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideSelectRowCount() {
        return [
            [
                [
                    'tables' => 'table',
                    'field' => [ '*' ],
                    'conds' => [ 'field' => 'text' ],
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE field = 'text'  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'column' ],
                    'conds' => [ 'field' => 'text' ],
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE field = 'text' AND (column IS NOT NULL)  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'alias' => 'column' ],
                    'conds' => [ 'field' => 'text' ],
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE field = 'text' AND (column IS NOT NULL)  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'alias' => 'column' ],
                    'conds' => '',
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE (column IS NOT NULL)  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'alias' => 'column' ],
                    'conds' => false,
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE (column IS NOT NULL)  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'alias' => 'column' ],
                    'conds' => null,
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE (column IS NOT NULL)  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'alias' => 'column' ],
                    'conds' => '1',
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE (1) AND (column IS NOT NULL)  ) tmp_count"
            ],
            [
                [
                    'tables' => 'table',
                    'field' => [ 'alias' => 'column' ],
                    'conds' => '0',
                ],
                "SELECT COUNT(*) AS rowcount FROM " .
                "(SELECT 1 FROM table WHERE (0) AND (column IS NOT NULL)  ) tmp_count"
            ],
        ];
    }
 
    public function testUpdate( $sql, $sqlText ) {
        $this->database->update(
            $sql['table'],
            $sql['values'],
            $sql['conds'],
            __METHOD__,
            isset( $sql['options'] ) ? $sql['options'] : []
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideUpdate() {
        return [
            [
                [
                    'table' => 'table',
                    'values' => [ 'field' => 'text', 'field2' => 'text2' ],
                    'conds' => [ 'alias' => 'text' ],
                ],
                "UPDATE table " .
                    "SET field = 'text'" .
                    ",field2 = 'text2' " .
                    "WHERE alias = 'text'"
            ],
            [
                [
                    'table' => 'table',
                    'values' => [ 'field = other', 'field2' => 'text2' ],
                    'conds' => [ 'id' => '1' ],
                ],
                "UPDATE table " .
                    "SET field = other" .
                    ",field2 = 'text2' " .
                    "WHERE id = '1'"
            ],
            [
                [
                    'table' => 'table',
                    'values' => [ 'field = other', 'field2' => 'text2' ],
                    'conds' => '*',
                ],
                "UPDATE table " .
                    "SET field = other" .
                    ",field2 = 'text2'"
            ],
        ];
    }
 
    public function testDelete( $sql, $sqlText ) {
        $this->database->delete(
            $sql['table'],
            $sql['conds'],
            __METHOD__
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideDelete() {
        return [
            [
                [
                    'table' => 'table',
                    'conds' => [ 'alias' => 'text' ],
                ],
                "DELETE FROM table " .
                    "WHERE alias = 'text'"
            ],
            [
                [
                    'table' => 'table',
                    'conds' => '*',
                ],
                "DELETE FROM table"
            ],
        ];
    }
 
    public function testUpsert( $sql, $sqlText ) {
        $this->database->upsert(
            $sql['table'],
            $sql['rows'],
            $sql['uniqueIndexes'],
            $sql['set'],
            __METHOD__
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideUpsert() {
        return [
            [
                [
                    'table' => 'upsert_table',
                    'rows' => [ 'field' => 'text', 'field2' => 'text2' ],
                    'uniqueIndexes' => [ 'field' ],
                    'set' => [ 'field' => 'set' ],
                ],
                "BEGIN; " .
                    "UPDATE upsert_table " .
                    "SET field = 'set' " .
                    "WHERE ((field = 'text')); " .
                    "INSERT IGNORE INTO upsert_table " .
                    "(field,field2) " .
                    "VALUES ('text','text2'); " .
                    "COMMIT"
            ],
        ];
    }
 
    public function testDeleteJoin( $sql, $sqlText ) {
        $this->database->deleteJoin(
            $sql['delTable'],
            $sql['joinTable'],
            $sql['delVar'],
            $sql['joinVar'],
            $sql['conds'],
            __METHOD__
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideDeleteJoin() {
        return [
            [
                [
                    'delTable' => 'table',
                    'joinTable' => 'table_join',
                    'delVar' => 'field',
                    'joinVar' => 'field_join',
                    'conds' => [ 'alias' => 'text' ],
                ],
                "DELETE FROM table " .
                    "WHERE field IN (" .
                    "SELECT field_join FROM table_join WHERE alias = 'text'" .
                    ")"
            ],
            [
                [
                    'delTable' => 'table',
                    'joinTable' => 'table_join',
                    'delVar' => 'field',
                    'joinVar' => 'field_join',
                    'conds' => '*',
                ],
                "DELETE FROM table " .
                    "WHERE field IN (" .
                    "SELECT field_join FROM table_join " .
                    ")"
            ],
        ];
    }
 
    public function testInsert( $sql, $sqlText ) {
        $this->database->insert(
            $sql['table'],
            $sql['rows'],
            __METHOD__,
            isset( $sql['options'] ) ? $sql['options'] : []
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideInsert() {
        return [
            [
                [
                    'table' => 'table',
                    'rows' => [ 'field' => 'text', 'field2' => 2 ],
                ],
                "INSERT INTO table " .
                    "(field,field2) " .
                    "VALUES ('text','2')"
            ],
            [
                [
                    'table' => 'table',
                    'rows' => [ 'field' => 'text', 'field2' => 2 ],
                    'options' => 'IGNORE',
                ],
                "INSERT IGNORE INTO table " .
                    "(field,field2) " .
                    "VALUES ('text','2')"
            ],
            [
                [
                    'table' => 'table',
                    'rows' => [
                        [ 'field' => 'text', 'field2' => 2 ],
                        [ 'field' => 'multi', 'field2' => 3 ],
                    ],
                    'options' => 'IGNORE',
                ],
                "INSERT IGNORE INTO table " .
                    "(field,field2) " .
                    "VALUES " .
                    "('text','2')," .
                    "('multi','3')"
            ],
        ];
    }
 
    public function testInsertSelect( $sql, $sqlTextNative, $sqlSelect, $sqlInsert ) {
        $this->database->insertSelect(
            $sql['destTable'],
            $sql['srcTable'],
            $sql['varMap'],
            $sql['conds'],
            __METHOD__,
            isset( $sql['insertOptions'] ) ? $sql['insertOptions'] : [],
            isset( $sql['selectOptions'] ) ? $sql['selectOptions'] : [],
            isset( $sql['selectJoinConds'] ) ? $sql['selectJoinConds'] : []
        );
        $this->assertLastSql( $sqlTextNative );
 
        $dbWeb = new DatabaseTestHelper( __CLASS__, [ 'cliMode' => false ] );
        $dbWeb->forceNextResult( [
            array_flip( array_keys( $sql['varMap'] ) )
        ] );
        $dbWeb->insertSelect(
            $sql['destTable'],
            $sql['srcTable'],
            $sql['varMap'],
            $sql['conds'],
            __METHOD__,
            isset( $sql['insertOptions'] ) ? $sql['insertOptions'] : [],
            isset( $sql['selectOptions'] ) ? $sql['selectOptions'] : [],
            isset( $sql['selectJoinConds'] ) ? $sql['selectJoinConds'] : []
        );
        $this->assertLastSqlDb( implode( '; ', [ $sqlSelect, 'BEGIN', $sqlInsert, 'COMMIT' ] ), $dbWeb );
    }
 
    public static function provideInsertSelect() {
        return [
            [
                [
                    'destTable' => 'insert_table',
                    'srcTable' => 'select_table',
                    'varMap' => [ 'field_insert' => 'field_select', 'field' => 'field2' ],
                    'conds' => '*',
                ],
                "INSERT INTO insert_table " .
                    "(field_insert,field) " .
                    "SELECT field_select,field2 " .
                    "FROM select_table WHERE *",
                "SELECT field_select AS field_insert,field2 AS field " .
                "FROM select_table WHERE *   FOR UPDATE",
                "INSERT INTO insert_table (field_insert,field) VALUES ('0','1')"
            ],
            [
                [
                    'destTable' => 'insert_table',
                    'srcTable' => 'select_table',
                    'varMap' => [ 'field_insert' => 'field_select', 'field' => 'field2' ],
                    'conds' => [ 'field' => 2 ],
                ],
                "INSERT INTO insert_table " .
                    "(field_insert,field) " .
                    "SELECT field_select,field2 " .
                    "FROM select_table " .
                    "WHERE field = '2'",
                "SELECT field_select AS field_insert,field2 AS field FROM " .
                "select_table WHERE field = '2'   FOR UPDATE",
                "INSERT INTO insert_table (field_insert,field) VALUES ('0','1')"
            ],
            [
                [
                    'destTable' => 'insert_table',
                    'srcTable' => 'select_table',
                    'varMap' => [ 'field_insert' => 'field_select', 'field' => 'field2' ],
                    'conds' => [ 'field' => 2 ],
                    'insertOptions' => 'IGNORE',
                    'selectOptions' => [ 'ORDER BY' => 'field' ],
                ],
                "INSERT IGNORE INTO insert_table " .
                    "(field_insert,field) " .
                    "SELECT field_select,field2 " .
                    "FROM select_table " .
                    "WHERE field = '2' " .
                    "ORDER BY field",
                "SELECT field_select AS field_insert,field2 AS field " .
                "FROM select_table WHERE field = '2' ORDER BY field  FOR UPDATE",
                "INSERT IGNORE INTO insert_table (field_insert,field) VALUES ('0','1')"
            ],
            [
                [
                    'destTable' => 'insert_table',
                    'srcTable' => [ 'select_table1', 'select_table2' ],
                    'varMap' => [ 'field_insert' => 'field_select', 'field' => 'field2' ],
                    'conds' => [ 'field' => 2 ],
                    'insertOptions' => [ 'NO_AUTO_COLUMNS' ],
                    'selectOptions' => [ 'ORDER BY' => 'field', 'FORCE INDEX' => [ 'select_table1' => 'index1' ] ],
                    'selectJoinConds' => [
                        'select_table2' => [ 'LEFT JOIN', [ 'select_table1.foo = select_table2.bar' ] ],
                    ],
                ],
                "INSERT INTO insert_table " .
                    "(field_insert,field) " .
                    "SELECT field_select,field2 " .
                    "FROM select_table1 LEFT JOIN select_table2 ON ((select_table1.foo = select_table2.bar)) " .
                    "WHERE field = '2' " .
                    "ORDER BY field",
                "SELECT field_select AS field_insert,field2 AS field " .
                "FROM select_table1 LEFT JOIN select_table2 ON ((select_table1.foo = select_table2.bar)) " .
                "WHERE field = '2' ORDER BY field  FOR UPDATE",
                "INSERT INTO insert_table (field_insert,field) VALUES ('0','1')"
            ],
        ];
    }
 
    public function testInsertSelectBatching() {
        $dbWeb = new DatabaseTestHelper( __CLASS__, [ 'cliMode' => false ] );
        $rows = [];
        for ( $i = 0; $i <= 25000; $i++ ) {
            $rows[] = [ 'field' => $i ];
        }
        $dbWeb->forceNextResult( $rows );
        $dbWeb->insertSelect(
            'insert_table',
            'select_table',
            [ 'field' => 'field2' ],
            '*',
            __METHOD__
        );
        $this->assertLastSqlDb( implode( '; ', [
            'SELECT field2 AS field FROM select_table WHERE *   FOR UPDATE',
            'BEGIN',
            "INSERT INTO insert_table (field) VALUES ('" . implode( "'),('", range( 0, 9999 ) ) . "')",
            "INSERT INTO insert_table (field) VALUES ('" . implode( "'),('", range( 10000, 19999 ) ) . "')",
            "INSERT INTO insert_table (field) VALUES ('" . implode( "'),('", range( 20000, 25000 ) ) . "')",
            'COMMIT'
        ] ), $dbWeb );
    }
 
    public function testReplace( $sql, $sqlText ) {
        $this->database->replace(
            $sql['table'],
            $sql['uniqueIndexes'],
            $sql['rows'],
            __METHOD__
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideReplace() {
        return [
            [
                [
                    'table' => 'replace_table',
                    'uniqueIndexes' => [ 'field' ],
                    'rows' => [ 'field' => 'text', 'field2' => 'text2' ],
                ],
                "BEGIN; DELETE FROM replace_table " .
                    "WHERE (field = 'text'); " .
                    "INSERT INTO replace_table " .
                    "(field,field2) " .
                    "VALUES ('text','text2'); COMMIT"
            ],
            [
                [
                    'table' => 'module_deps',
                    'uniqueIndexes' => [ [ 'md_module', 'md_skin' ] ],
                    'rows' => [
                        'md_module' => 'module',
                        'md_skin' => 'skin',
                        'md_deps' => 'deps',
                    ],
                ],
                "BEGIN; DELETE FROM module_deps " .
                    "WHERE (md_module = 'module' AND md_skin = 'skin'); " .
                    "INSERT INTO module_deps " .
                    "(md_module,md_skin,md_deps) " .
                    "VALUES ('module','skin','deps'); COMMIT"
            ],
            [
                [
                    'table' => 'module_deps',
                    'uniqueIndexes' => [ [ 'md_module', 'md_skin' ] ],
                    'rows' => [
                        [
                            'md_module' => 'module',
                            'md_skin' => 'skin',
                            'md_deps' => 'deps',
                        ], [
                            'md_module' => 'module2',
                            'md_skin' => 'skin2',
                            'md_deps' => 'deps2',
                        ],
                    ],
                ],
                "BEGIN; DELETE FROM module_deps " .
                    "WHERE (md_module = 'module' AND md_skin = 'skin'); " .
                    "INSERT INTO module_deps " .
                    "(md_module,md_skin,md_deps) " .
                    "VALUES ('module','skin','deps'); " .
                    "DELETE FROM module_deps " .
                    "WHERE (md_module = 'module2' AND md_skin = 'skin2'); " .
                    "INSERT INTO module_deps " .
                    "(md_module,md_skin,md_deps) " .
                    "VALUES ('module2','skin2','deps2'); COMMIT"
            ],
            [
                [
                    'table' => 'module_deps',
                    'uniqueIndexes' => [ 'md_module', 'md_skin' ],
                    'rows' => [
                        [
                            'md_module' => 'module',
                            'md_skin' => 'skin',
                            'md_deps' => 'deps',
                        ], [
                            'md_module' => 'module2',
                            'md_skin' => 'skin2',
                            'md_deps' => 'deps2',
                        ],
                    ],
                ],
                "BEGIN; DELETE FROM module_deps " .
                    "WHERE (md_module = 'module') OR (md_skin = 'skin'); " .
                    "INSERT INTO module_deps " .
                    "(md_module,md_skin,md_deps) " .
                    "VALUES ('module','skin','deps'); " .
                    "DELETE FROM module_deps " .
                    "WHERE (md_module = 'module2') OR (md_skin = 'skin2'); " .
                    "INSERT INTO module_deps " .
                    "(md_module,md_skin,md_deps) " .
                    "VALUES ('module2','skin2','deps2'); COMMIT"
            ],
            [
                [
                    'table' => 'module_deps',
                    'uniqueIndexes' => [],
                    'rows' => [
                        'md_module' => 'module',
                        'md_skin' => 'skin',
                        'md_deps' => 'deps',
                    ],
                ],
                "BEGIN; INSERT INTO module_deps " .
                    "(md_module,md_skin,md_deps) " .
                    "VALUES ('module','skin','deps'); COMMIT"
            ],
        ];
    }
 
    public function testNativeReplace( $sql, $sqlText ) {
        $this->database->nativeReplace(
            $sql['table'],
            $sql['rows'],
            __METHOD__
        );
        $this->assertLastSql( $sqlText );
    }
 
    public static function provideNativeReplace() {
        return [
            [
                [
                    'table' => 'replace_table',
                    'rows' => [ 'field' => 'text', 'field2' => 'text2' ],
                ],
                "REPLACE INTO replace_table " .
                    "(field,field2) " .
                    "VALUES ('text','text2')"
            ],
        ];
    }
 
    public function testConditional( $sql, $sqlText ) {
        $this->assertEquals( trim( $this->database->conditional(
            $sql['conds'],
            $sql['true'],
            $sql['false']
        ) ), $sqlText );
    }
 
    public static function provideConditional() {
        return [
            [
                [
                    'conds' => [ 'field' => 'text' ],
                    'true' => 1,
                    'false' => 'NULL',
                ],
                "(CASE WHEN field = 'text' THEN 1 ELSE NULL END)"
            ],
            [
                [
                    'conds' => [ 'field' => 'text', 'field2' => 'anothertext' ],
                    'true' => 1,
                    'false' => 'NULL',
                ],
                "(CASE WHEN field = 'text' AND field2 = 'anothertext' THEN 1 ELSE NULL END)"
            ],
            [
                [
                    'conds' => 'field=1',
                    'true' => 1,
                    'false' => 'NULL',
                ],
                "(CASE WHEN field=1 THEN 1 ELSE NULL END)"
            ],
        ];
    }
 
    public function testBuildConcat( $stringList, $sqlText ) {
        $this->assertEquals( trim( $this->database->buildConcat(
            $stringList
        ) ), $sqlText );
    }
 
    public static function provideBuildConcat() {
        return [
            [
                [ 'field', 'field2' ],
                "CONCAT(field,field2)"
            ],
            [
                [ "'test'", 'field2' ],
                "CONCAT('test',field2)"
            ],
        ];
    }
 
    public function testBuildLike( $array, $sqlText ) {
        $this->assertEquals( trim( $this->database->buildLike(
            $array
        ) ), $sqlText );
    }
 
    public static function provideBuildLike() {
        return [
            [
                'text',
                "LIKE 'text' ESCAPE '`'"
            ],
            [
                [ 'text', new LikeMatch( '%' ) ],
                "LIKE 'text%' ESCAPE '`'"
            ],
            [
                [ 'text', new LikeMatch( '%' ), 'text2' ],
                "LIKE 'text%text2' ESCAPE '`'"
            ],
            [
                [ 'text', new LikeMatch( '_' ) ],
                "LIKE 'text_' ESCAPE '`'"
            ],
            [
                'more_text',
                "LIKE 'more`_text' ESCAPE '`'"
            ],
            [
                [ 'C:\\Windows\\', new LikeMatch( '%' ) ],
                "LIKE 'C:\\Windows\\%' ESCAPE '`'"
            ],
            [
                [ 'accent`_test`', new LikeMatch( '%' ) ],
                "LIKE 'accent```_test``%' ESCAPE '`'"
            ],
        ];
    }
 
    public function testUnionQueries( $sql, $sqlText ) {
        $this->assertEquals( trim( $this->database->unionQueries(
            $sql['sqls'],
            $sql['all']
        ) ), $sqlText );
    }
 
    public static function provideUnionQueries() {
        return [
            [
                [
                    'sqls' => [ 'RAW SQL', 'RAW2SQL' ],
                    'all' => true,
                ],
                "(RAW SQL) UNION ALL (RAW2SQL)"
            ],
            [
                [
                    'sqls' => [ 'RAW SQL', 'RAW2SQL' ],
                    'all' => false,
                ],
                "(RAW SQL) UNION (RAW2SQL)"
            ],
            [
                [
                    'sqls' => [ 'RAW SQL', 'RAW2SQL', 'RAW3SQL' ],
                    'all' => false,
                ],
                "(RAW SQL) UNION (RAW2SQL) UNION (RAW3SQL)"
            ],
        ];
    }
 
    public function testUnionConditionPermutations( $params, $expect ) {
        if ( isset( $params['unionSupportsOrderAndLimit'] ) ) {
            $this->database->setUnionSupportsOrderAndLimit( $params['unionSupportsOrderAndLimit'] );
        }
 
        $sql = trim( $this->database->unionConditionPermutations(
            $params['table'],
            $params['vars'],
            $params['permute_conds'],
            isset( $params['extra_conds'] ) ? $params['extra_conds'] : '',
            'FNAME',
            isset( $params['options'] ) ? $params['options'] : [],
            isset( $params['join_conds'] ) ? $params['join_conds'] : []
        ) );
        $this->assertEquals( $expect, $sql );
    }
 
    public static function provideUnionConditionPermutations() {
        // phpcs:disable Generic.Files.LineLength
        return [
            [
                [
                    'table' => [ 'table1', 'table2' ],
                    'vars' => [ 'field1', 'alias' => 'field2' ],
                    'permute_conds' => [
                        'field3' => [ 1, 2, 3 ],
                        'duplicates' => [ 4, 5, 4 ],
                        'empty' => [],
                        'single' => [ 0 ],
                    ],
                    'extra_conds' => 'table2.bar > 23',
                    'options' => [
                        'ORDER BY' => [ 'field1', 'alias' ],
                        'INNER ORDER BY' => [ 'field1', 'field2' ],
                        'LIMIT' => 100,
                    ],
                    'join_conds' => [
                        'table2' => [ 'JOIN', 'table1.foo_id = table2.foo_id' ],
                    ],
                ],
                "(SELECT  field1,field2 AS alias  FROM table1 JOIN table2 ON ((table1.foo_id = table2.foo_id))   WHERE field3 = '1' AND duplicates = '4' AND single = '0' AND (table2.bar > 23)  ORDER BY field1,field2 LIMIT 100  ) UNION ALL " .
                "(SELECT  field1,field2 AS alias  FROM table1 JOIN table2 ON ((table1.foo_id = table2.foo_id))   WHERE field3 = '1' AND duplicates = '5' AND single = '0' AND (table2.bar > 23)  ORDER BY field1,field2 LIMIT 100  ) UNION ALL " .
                "(SELECT  field1,field2 AS alias  FROM table1 JOIN table2 ON ((table1.foo_id = table2.foo_id))   WHERE field3 = '2' AND duplicates = '4' AND single = '0' AND (table2.bar > 23)  ORDER BY field1,field2 LIMIT 100  ) UNION ALL " .
                "(SELECT  field1,field2 AS alias  FROM table1 JOIN table2 ON ((table1.foo_id = table2.foo_id))   WHERE field3 = '2' AND duplicates = '5' AND single = '0' AND (table2.bar > 23)  ORDER BY field1,field2 LIMIT 100  ) UNION ALL " .
                "(SELECT  field1,field2 AS alias  FROM table1 JOIN table2 ON ((table1.foo_id = table2.foo_id))   WHERE field3 = '3' AND duplicates = '4' AND single = '0' AND (table2.bar > 23)  ORDER BY field1,field2 LIMIT 100  ) UNION ALL " .
                "(SELECT  field1,field2 AS alias  FROM table1 JOIN table2 ON ((table1.foo_id = table2.foo_id))   WHERE field3 = '3' AND duplicates = '5' AND single = '0' AND (table2.bar > 23)  ORDER BY field1,field2 LIMIT 100  ) " .
                "ORDER BY field1,alias LIMIT 100"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [
                        'bar' => [ 1, 2, 3 ],
                    ],
                    'extra_conds' => [ 'baz' => null ],
                    'options' => [
                        'NOTALL',
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                    ],
                ],
                "(SELECT  foo_id  FROM foo    WHERE bar = '1' AND baz IS NULL  ORDER BY foo_id LIMIT 25  ) UNION " .
                "(SELECT  foo_id  FROM foo    WHERE bar = '2' AND baz IS NULL  ORDER BY foo_id LIMIT 25  ) UNION " .
                "(SELECT  foo_id  FROM foo    WHERE bar = '3' AND baz IS NULL  ORDER BY foo_id LIMIT 25  ) " .
                "ORDER BY foo_id LIMIT 25"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [
                        'bar' => [ 1, 2, 3 ],
                    ],
                    'extra_conds' => [ 'baz' => null ],
                    'options' => [
                        'NOTALL' => true,
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                    ],
                    'unionSupportsOrderAndLimit' => false,
                ],
                "(SELECT  foo_id  FROM foo    WHERE bar = '1' AND baz IS NULL  ) UNION " .
                "(SELECT  foo_id  FROM foo    WHERE bar = '2' AND baz IS NULL  ) UNION " .
                "(SELECT  foo_id  FROM foo    WHERE bar = '3' AND baz IS NULL  ) " .
                "ORDER BY foo_id LIMIT 25"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [],
                    'extra_conds' => [ 'baz' => null ],
                    'options' => [
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                    ],
                ],
                "SELECT  foo_id  FROM foo    WHERE baz IS NULL  ORDER BY foo_id LIMIT 25"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [
                        'bar' => [],
                    ],
                    'extra_conds' => [ 'baz' => null ],
                    'options' => [
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                    ],
                ],
                "SELECT  foo_id  FROM foo    WHERE baz IS NULL  ORDER BY foo_id LIMIT 25"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [
                        'bar' => [ 1 ],
                    ],
                    'options' => [
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                        'OFFSET' => 150,
                    ],
                ],
                "SELECT  foo_id  FROM foo    WHERE bar = '1'  ORDER BY foo_id LIMIT 150,25"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [],
                    'extra_conds' => [ 'baz' => null ],
                    'options' => [
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                        'OFFSET' => 150,
                        'INNER ORDER BY' => [ 'bar_id' ],
                    ],
                ],
                "(SELECT  foo_id  FROM foo    WHERE baz IS NULL  ORDER BY bar_id LIMIT 175  ) ORDER BY foo_id LIMIT 150,25"
            ],
            [
                [
                    'table' => 'foo',
                    'vars' => [ 'foo_id' ],
                    'permute_conds' => [],
                    'extra_conds' => [ 'baz' => null ],
                    'options' => [
                        'ORDER BY' => [ 'foo_id' ],
                        'LIMIT' => 25,
                        'OFFSET' => 150,
                        'INNER ORDER BY' => [ 'bar_id' ],
                    ],
                    'unionSupportsOrderAndLimit' => false,
                ],
                "SELECT  foo_id  FROM foo    WHERE baz IS NULL  ORDER BY foo_id LIMIT 150,25"
            ],
        ];
        // phpcs:enable
    }
 
    public function testTransactionCommit() {
        $this->database->begin( __METHOD__ );
        $this->database->commit( __METHOD__ );
        $this->assertLastSql( 'BEGIN; COMMIT' );
    }
 
    public function testTransactionRollback() {
        $this->database->begin( __METHOD__ );
        $this->database->rollback( __METHOD__ );
        $this->assertLastSql( 'BEGIN; ROLLBACK' );
    }
 
    public function testDropTable() {
        $this->database->setExistingTables( [ 'table' ] );
        $this->database->dropTable( 'table', __METHOD__ );
        $this->assertLastSql( 'DROP TABLE table CASCADE' );
    }
 
    public function testDropNonExistingTable() {
        $this->assertFalse(
            $this->database->dropTable( 'non_existing', __METHOD__ )
        );
    }
 
    public function testMakeList( $list, $mode, $sqlText ) {
        $this->assertEquals( trim( $this->database->makeList(
            $list, $mode
        ) ), $sqlText );
    }
 
    public static function provideMakeList() {
        return [
            [
                [ 'value', 'value2' ],
                LIST_COMMA,
                "'value','value2'"
            ],
            [
                [ 'field', 'field2' ],
                LIST_NAMES,
                "field,field2"
            ],
            [
                [ 'field' => 'value', 'field2' => 'value2' ],
                LIST_AND,
                "field = 'value' AND field2 = 'value2'"
            ],
            [
                [ 'field' => null, "field2 != 'value2'" ],
                LIST_AND,
                "field IS NULL AND (field2 != 'value2')"
            ],
            [
                [ 'field' => [ 'value', null, 'value2' ], 'field2' => 'value2' ],
                LIST_AND,
                "(field IN ('value','value2')  OR field IS NULL) AND field2 = 'value2'"
            ],
            [
                [ 'field' => [ null ], 'field2' => null ],
                LIST_AND,
                "field IS NULL AND field2 IS NULL"
            ],
            [
                [ 'field' => 'value', 'field2' => 'value2' ],
                LIST_OR,
                "field = 'value' OR field2 = 'value2'"
            ],
            [
                [ 'field' => 'value', 'field2' => null ],
                LIST_OR,
                "field = 'value' OR field2 IS NULL"
            ],
            [
                [ 'field' => [ 'value', 'value2' ], 'field2' => [ 'value' ] ],
                LIST_OR,
                "field IN ('value','value2')  OR field2 = 'value'"
            ],
            [
                [ 'field' => [ null, 'value', null, 'value2' ], "field2 != 'value2'" ],
                LIST_OR,
                "(field IN ('value','value2')  OR field IS NULL) OR (field2 != 'value2')"
            ],
            [
                [ 'field' => 'value', 'field2' => 'value2' ],
                LIST_SET,
                "field = 'value',field2 = 'value2'"
            ],
            [
                [ 'field' => 'value', 'field2' => null ],
                LIST_SET,
                "field = 'value',field2 = NULL"
            ],
            [
                [ 'field' => 'value', "field2 != 'value2'" ],
                LIST_SET,
                "field = 'value',field2 != 'value2'"
            ],
        ];
    }
 
    public function testSessionTempTables() {
        $temp1 = $this->database->tableName( 'tmp_table_1' );
        $temp2 = $this->database->tableName( 'tmp_table_2' );
        $temp3 = $this->database->tableName( 'tmp_table_3' );
 
        $this->database->query( "CREATE TEMPORARY TABLE $temp1 LIKE orig_tbl", __METHOD__ );
        $this->database->query( "CREATE TEMPORARY TABLE $temp2 LIKE orig_tbl", __METHOD__ );
        $this->database->query( "CREATE TEMPORARY TABLE $temp3 LIKE orig_tbl", __METHOD__ );
 
        $this->assertTrue( $this->database->tableExists( "tmp_table_1", __METHOD__ ) );
        $this->assertTrue( $this->database->tableExists( "tmp_table_2", __METHOD__ ) );
        $this->assertTrue( $this->database->tableExists( "tmp_table_3", __METHOD__ ) );
 
        $this->database->dropTable( 'tmp_table_1', __METHOD__ );
        $this->database->dropTable( 'tmp_table_2', __METHOD__ );
        $this->database->dropTable( 'tmp_table_3', __METHOD__ );
 
        $this->assertFalse( $this->database->tableExists( "tmp_table_1", __METHOD__ ) );
        $this->assertFalse( $this->database->tableExists( "tmp_table_2", __METHOD__ ) );
        $this->assertFalse( $this->database->tableExists( "tmp_table_3", __METHOD__ ) );
 
        $this->database->query( "CREATE TEMPORARY TABLE tmp_table_1 LIKE orig_tbl", __METHOD__ );
        $this->database->query( "CREATE TEMPORARY TABLE 'tmp_table_2' LIKE orig_tbl", __METHOD__ );
        $this->database->query( "CREATE TEMPORARY TABLE `tmp_table_3` LIKE orig_tbl", __METHOD__ );
 
        $this->assertTrue( $this->database->tableExists( "tmp_table_1", __METHOD__ ) );
        $this->assertTrue( $this->database->tableExists( "tmp_table_2", __METHOD__ ) );
        $this->assertTrue( $this->database->tableExists( "tmp_table_3", __METHOD__ ) );
 
        $this->database->query( "DROP TEMPORARY TABLE tmp_table_1 LIKE orig_tbl", __METHOD__ );
        $this->database->query( "DROP TEMPORARY TABLE 'tmp_table_2' LIKE orig_tbl", __METHOD__ );
        $this->database->query( "DROP TABLE `tmp_table_3` LIKE orig_tbl", __METHOD__ );
 
        $this->assertFalse( $this->database->tableExists( "tmp_table_1", __METHOD__ ) );
        $this->assertFalse( $this->database->tableExists( "tmp_table_2", __METHOD__ ) );
        $this->assertFalse( $this->database->tableExists( "tmp_table_3", __METHOD__ ) );
    }
 
    public function provideBuildSubstring() {
        yield [ 'someField', 1, 2, 'SUBSTRING(someField FROM 1 FOR 2)' ];
        yield [ 'someField', 1, null, 'SUBSTRING(someField FROM 1)' ];
    }
 
    public function testBuildSubstring( $input, $start, $length, $expected ) {
        $output = $this->database->buildSubstring( $input, $start, $length );
        $this->assertSame( $expected, $output );
    }
 
    public function provideBuildSubstring_invalidParams() {
        yield [ -1, 1 ];
        yield [ 1, -1 ];
        yield [ 1, 'foo' ];
        yield [ 'foo', 1 ];
        yield [ null, 1 ];
        yield [ 0, 1 ];
    }
 
    public function testBuildSubstring_invalidParams( $start, $length ) {
        $this->setExpectedException( InvalidArgumentException::class );
        $this->database->buildSubstring( 'foo', $start, $length );
    }
 
    public function testBuildIntegerCast() {
        $output = $this->database->buildIntegerCast( 'fieldName' );
        $this->assertSame( 'CAST( fieldName AS INTEGER )', $output );
    }
 
    public function testAtomicSections() {
        $this->database->startAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->assertLastSql( 'BEGIN; COMMIT' );
 
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->cancelAtomic( __METHOD__ );
        $this->assertLastSql( 'BEGIN; ROLLBACK' );
 
        $this->database->begin( __METHOD__ );
        $this->database->startAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->database->commit( __METHOD__ );
        $this->assertLastSql( 'BEGIN; COMMIT' );
 
        $this->database->begin( __METHOD__ );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->endAtomic( __METHOD__ );
        $this->database->commit( __METHOD__ );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; RELEASE SAVEPOINT wikimedia_rdbms_atomic1; COMMIT' );
 
        $this->database->begin( __METHOD__ );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->commit( __METHOD__ );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; COMMIT' );
 
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; COMMIT' );
 
        $noOpCallack = function () {
        };
 
        $this->database->doAtomicSection( __METHOD__, $noOpCallack, IDatabase::ATOMIC_CANCELABLE );
        $this->assertLastSql( 'BEGIN; COMMIT' );
 
        $this->database->doAtomicSection( __METHOD__, $noOpCallack );
        $this->assertLastSql( 'BEGIN; COMMIT' );
 
        $this->database->begin( __METHOD__ );
        $this->database->doAtomicSection( __METHOD__, $noOpCallack, IDatabase::ATOMIC_CANCELABLE );
        $this->database->rollback( __METHOD__ );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; RELEASE SAVEPOINT wikimedia_rdbms_atomic1; ROLLBACK' );
 
        $fname = __METHOD__;
        $triggerMap = [
            '-' => '-',
            IDatabase::TRIGGER_COMMIT => 'tCommit',
            IDatabase::TRIGGER_ROLLBACK => 'tRollback'
        ];
        $callback1 = function ( $trigger = '-' ) use ( $fname, $triggerMap ) {
            $this->database->query( "SELECT 1, {$triggerMap[$trigger]} AS t", $fname );
        };
        $callback2 = function ( $trigger = '-' ) use ( $fname, $triggerMap ) {
            $this->database->query( "SELECT 2, {$triggerMap[$trigger]} AS t", $fname );
        };
        $callback3 = function ( $trigger = '-' ) use ( $fname, $triggerMap ) {
            $this->database->query( "SELECT 3, {$triggerMap[$trigger]} AS t", $fname );
        };
 
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionPreCommitOrIdle( $callback1, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->assertLastSql( 'BEGIN; ROLLBACK' );
 
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->assertLastSql( 'BEGIN; ROLLBACK' );
 
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionResolution( $callback1, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->assertLastSql( 'BEGIN; ROLLBACK; SELECT 1, tRollback AS t' );
 
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->onTransactionPreCommitOrIdle( $callback1, __METHOD__ );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback3, __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertLastSql( implode( "; ", [
            'BEGIN',
            'SAVEPOINT wikimedia_rdbms_atomic1',
            'ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1',
            'SELECT 1, - AS t',
            'SELECT 3, - AS t',
            'COMMIT'
        ] ) );
 
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionIdle( $callback2, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->onTransactionIdle( $callback3, __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertLastSql( implode( "; ", [
            'BEGIN',
            'SAVEPOINT wikimedia_rdbms_atomic1',
            'ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1',
            'COMMIT',
            'SELECT 1, tCommit AS t',
            'SELECT 3, tCommit AS t'
        ] ) );
 
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->onTransactionResolution( $callback1, __METHOD__ );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionResolution( $callback2, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertLastSql( implode( "; ", [
            'BEGIN',
            'SAVEPOINT wikimedia_rdbms_atomic1',
            'ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1',
            'COMMIT',
            'SELECT 1, tCommit AS t',
            'SELECT 2, tRollback AS t',
            'SELECT 3, tCommit AS t'
        ] ) );
 
        $makeCallback = function ( $id ) use ( $fname, $triggerMap ) {
            return function ( $trigger = '-' ) use ( $id, $fname, $triggerMap ) {
                $this->database->query( "SELECT $id, {$triggerMap[$trigger]} AS t", $fname );
            };
        };
 
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionResolution( $makeCallback( 1 ), __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertLastSql( implode( "; ", [
            'BEGIN',
            'SAVEPOINT wikimedia_rdbms_atomic1',
            'ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1',
            'COMMIT',
            'SELECT 1, tRollback AS t'
        ] ) );
 
        $this->database->startAtomic( __METHOD__ . '_level1', IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionResolution( $makeCallback( 1 ), __METHOD__ );
        $this->database->startAtomic( __METHOD__ . '_level2' );
        $this->database->startAtomic( __METHOD__ . '_level3', IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionResolution( $makeCallback( 2 ), __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->database->onTransactionResolution( $makeCallback( 3 ), __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ . '_level3' );
        $this->database->endAtomic( __METHOD__ . '_level2' );
        $this->database->onTransactionResolution( $makeCallback( 4 ), __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_level1' );
        $this->assertLastSql( implode( "; ", [
            'BEGIN',
            'SAVEPOINT wikimedia_rdbms_atomic1',
            'SAVEPOINT wikimedia_rdbms_atomic2',
            'RELEASE SAVEPOINT wikimedia_rdbms_atomic2',
            'ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1',
            'COMMIT; SELECT 1, tCommit AS t',
            'SELECT 2, tRollback AS t',
            'SELECT 3, tRollback AS t',
            'SELECT 4, tCommit AS t'
        ] ) );
    }
 
    public function testAtomicSectionsRecovery() {
        $this->database->begin( __METHOD__ );
        try {
            $this->database->doAtomicSection(
                __METHOD__,
                function () {
                    $this->database->startAtomic( 'inner_func1' );
                    $this->database->startAtomic( 'inner_func2' );
 
                    throw new RuntimeException( 'Test exception' );
                },
                IDatabase::ATOMIC_CANCELABLE
            );
            $this->fail( 'Expected exception not thrown' );
        } catch ( RuntimeException $ex ) {
            $this->assertSame( 'Test exception', $ex->getMessage() );
        }
        $this->database->commit( __METHOD__ );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; COMMIT' );
 
        $this->database->begin( __METHOD__ );
        try {
            $this->database->doAtomicSection(
                __METHOD__,
                function () {
                    throw new RuntimeException( 'Test exception' );
                }
            );
            $this->fail( 'Test exception not thrown' );
        } catch ( RuntimeException $ex ) {
            $this->assertSame( 'Test exception', $ex->getMessage() );
        }
        try {
            $this->database->commit( __METHOD__ );
            $this->fail( 'Test exception not thrown' );
        } catch ( DBTransactionError $ex ) {
            $this->assertSame(
                'Cannot execute query from ' . __METHOD__ . ' while transaction status is ERROR.',
                $ex->getMessage()
            );
        }
        $this->database->rollback( __METHOD__ );
        $this->assertLastSql( 'BEGIN; ROLLBACK' );
    }
 
    public function testAtomicSectionsCallbackCancellation() {
        $fname = __METHOD__;
        $callback1Called = null;
        $callback1 = function ( $trigger = '-' ) use ( $fname, &$callback1Called ) {
            $callback1Called = $trigger;
            $this->database->query( "SELECT 1", $fname );
        };
        $callback2Called = null;
        $callback2 = function ( $trigger = '-' ) use ( $fname, &$callback2Called ) {
            $callback2Called = $trigger;
            $this->database->query( "SELECT 2", $fname );
        };
        $callback3Called = null;
        $callback3 = function ( $trigger = '-' ) use ( $fname, &$callback3Called ) {
            $callback3Called = $trigger;
            $this->database->query( "SELECT 3", $fname );
        };
 
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__ . '_inner' );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_inner' );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertNull( $callback1Called );
        $this->assertNull( $callback2Called );
        $this->assertEquals( IDatabase::TRIGGER_ROLLBACK, $callback3Called );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; COMMIT; SELECT 3' );
 
        $callback1Called = null;
        $callback2Called = null;
        $callback3Called = null;
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__ . '_inner', IDatabase::ATOMIC_CANCELABLE );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_inner' );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertNull( $callback1Called );
        $this->assertNull( $callback2Called );
        $this->assertEquals( IDatabase::TRIGGER_ROLLBACK, $callback3Called );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; SAVEPOINT wikimedia_rdbms_atomic2; RELEASE SAVEPOINT wikimedia_rdbms_atomic2; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; COMMIT; SELECT 3' );
 
        $callback1Called = null;
        $callback2Called = null;
        $callback3Called = null;
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $atomicId = $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__ . '_inner' );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__, $atomicId );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertNull( $callback1Called );
        $this->assertNull( $callback2Called );
        $this->assertEquals( IDatabase::TRIGGER_ROLLBACK, $callback3Called );
 
        $callback1Called = null;
        $callback2Called = null;
        $callback3Called = null;
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $atomicId = $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__ . '_inner' );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        try {
            $this->database->cancelAtomic( __METHOD__ . '_X', $atomicId );
        } catch ( DBUnexpectedError $e ) {
            $m = __METHOD__;
            $this->assertSame(
                "Invalid atomic section ended (got {$m}_X but expected {$m}).",
                $e->getMessage()
            );
        }
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertNull( $callback1Called );
        $this->assertNull( $callback2Called );
        $this->assertEquals( IDatabase::TRIGGER_ROLLBACK, $callback3Called );
 
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__ . '_inner' );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        $this->database->cancelAtomic( __METHOD__ . '_inner' );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertNull( $callback1Called );
        $this->assertNull( $callback2Called );
        $this->assertEquals( IDatabase::TRIGGER_ROLLBACK, $callback3Called );
 
        $wrapper = TestingAccessWrapper::newFromObject( $this->database );
        $callback1Called = null;
        $callback2Called = null;
        $callback3Called = null;
        $this->database->startAtomic( __METHOD__ . '_outer' );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->startAtomic( __METHOD__ . '_inner' );
        $this->database->onTransactionIdle( $callback1, __METHOD__ );
        $this->database->onTransactionPreCommitOrIdle( $callback2, __METHOD__ );
        $this->database->onTransactionResolution( $callback3, __METHOD__ );
        $wrapper->trxStatus = Database::STATUS_TRX_ERROR;
        $this->database->cancelAtomic( __METHOD__ . '_inner' );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->endAtomic( __METHOD__ . '_outer' );
        $this->assertNull( $callback1Called );
        $this->assertNull( $callback2Called );
        $this->assertEquals( IDatabase::TRIGGER_ROLLBACK, $callback3Called );
    }
 
    public function testAtomicSectionsTrxRound() {
        $this->database->setFlag( IDatabase::DBO_TRX );
        $this->database->startAtomic( __METHOD__, IDatabase::ATOMIC_CANCELABLE );
        $this->database->query( 'SELECT 1', __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->database->commit( __METHOD__, IDatabase::FLUSHING_ALL_PEERS );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; SELECT 1; RELEASE SAVEPOINT wikimedia_rdbms_atomic1; COMMIT' );
    }
 
    public static function provideAtomicSectionMethodsForErrors() {
        return [
            [ 'endAtomic' ],
            [ 'cancelAtomic' ],
        ];
    }
 
    public function testNoAtomicSection( $method ) {
        try {
            $this->database->$method( __METHOD__ );
            $this->fail( 'Expected exception not thrown' );
        } catch ( DBUnexpectedError $ex ) {
            $this->assertSame(
                'No atomic section is open (got ' . __METHOD__ . ').',
                $ex->getMessage()
            );
        }
    }
 
    public function testInvalidAtomicSectionEnded( $method ) {
        $this->database->startAtomic( __METHOD__ . 'X' );
        try {
            $this->database->$method( __METHOD__ );
            $this->fail( 'Expected exception not thrown' );
        } catch ( DBUnexpectedError $ex ) {
            $this->assertSame(
                'Invalid atomic section ended (got ' . __METHOD__ . ' but expected ' .
                    __METHOD__ . 'X' . ').',
                $ex->getMessage()
            );
        }
    }
 
    public function testUncancellableAtomicSection() {
        $this->database->startAtomic( __METHOD__ );
        try {
            $this->database->cancelAtomic( __METHOD__ );
            $this->database->select( 'test', '1', [], __METHOD__ );
            $this->fail( 'Expected exception not thrown' );
        } catch ( DBTransactionError $ex ) {
            $this->assertSame(
                'Cannot execute query from ' . __METHOD__ . ' while transaction status is ERROR.',
                $ex->getMessage()
            );
        }
    }
 
    public function testTransactionErrorState1() {
        $wrapper = TestingAccessWrapper::newFromObject( $this->database );
 
        $this->database->begin( __METHOD__ );
        $wrapper->trxStatus = Database::STATUS_TRX_ERROR;
        $this->database->delete( 'x', [ 'field' => 3 ], __METHOD__ );
        $this->database->commit( __METHOD__ );
    }
 
    public function testTransactionErrorState2() {
        $wrapper = TestingAccessWrapper::newFromObject( $this->database );
 
        $this->database->startAtomic( __METHOD__ );
        $wrapper->trxStatus = Database::STATUS_TRX_ERROR;
        $this->database->rollback( __METHOD__ );
        $this->assertEquals( 0, $this->database->trxLevel() );
        $this->assertEquals( Database::STATUS_TRX_NONE, $wrapper->trxStatus() );
        $this->assertLastSql( 'BEGIN; ROLLBACK' );
 
        $this->database->startAtomic( __METHOD__ );
        $this->assertEquals( Database::STATUS_TRX_OK, $wrapper->trxStatus() );
        $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->assertEquals( Database::STATUS_TRX_NONE, $wrapper->trxStatus() );
        $this->assertLastSql( 'BEGIN; DELETE FROM x WHERE field = \'1\'; COMMIT' );
        $this->assertEquals( 0, $this->database->trxLevel(), 'Use after rollback()' );
 
        $this->database->begin( __METHOD__ );
        $this->database->startAtomic( __METHOD__, Database::ATOMIC_CANCELABLE );
        $this->database->update( 'y', [ 'a' => 1 ], [ 'field' => 1 ], __METHOD__ );
        $wrapper->trxStatus = Database::STATUS_TRX_ERROR;
        $this->database->cancelAtomic( __METHOD__ );
        $this->assertEquals( Database::STATUS_TRX_OK, $wrapper->trxStatus() );
        $this->database->startAtomic( __METHOD__ );
        $this->database->delete( 'y', [ 'field' => 1 ], __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->database->commit( __METHOD__ );
        // phpcs:ignore Generic.Files.LineLength
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; UPDATE y SET a = \'1\' WHERE field = \'1\'; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; DELETE FROM y WHERE field = \'1\'; COMMIT' );
        $this->assertEquals( 0, $this->database->trxLevel(), 'Use after rollback()' );
 
        // Next transaction
        $this->database->startAtomic( __METHOD__ );
        $this->assertEquals( Database::STATUS_TRX_OK, $wrapper->trxStatus() );
        $this->database->delete( 'x', [ 'field' => 3 ], __METHOD__ );
        $this->database->endAtomic( __METHOD__ );
        $this->assertEquals( Database::STATUS_TRX_NONE, $wrapper->trxStatus() );
        $this->assertLastSql( 'BEGIN; DELETE FROM x WHERE field = \'3\'; COMMIT' );
        $this->assertEquals( 0, $this->database->trxLevel() );
    }
 
    public function testImplicitTransactionRollback() {
        $doError = function () {
            $this->database->forceNextQueryError( 666, 'Evilness' );
            try {
                $this->database->delete( 'error', '1', __CLASS__ . '::SomeCaller' );
                $this->fail( 'Expected exception not thrown' );
            } catch ( DBError $e ) {
                $this->assertSame( 666, $e->errno );
            }
        };
 
        $this->database->setFlag( Database::DBO_TRX );
 
        // Implicit transaction gets silently rolled back
        $this->database->begin( __METHOD__, Database::TRANSACTION_INTERNAL );
        call_user_func( $doError );
        $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
        $this->database->commit( __METHOD__, Database::FLUSHING_INTERNAL );
        // phpcs:ignore
        $this->assertLastSql( 'BEGIN; DELETE FROM error WHERE 1; ROLLBACK; BEGIN; DELETE FROM x WHERE field = \'1\'; COMMIT' );
 
        // ... unless there were prior writes
        $this->database->begin( __METHOD__, Database::TRANSACTION_INTERNAL );
        $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
        call_user_func( $doError );
        try {
            $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
            $this->fail( 'Expected exception not thrown' );
        } catch ( DBTransactionStateError $e ) {
        }
        $this->database->rollback( __METHOD__, Database::FLUSHING_INTERNAL );
        // phpcs:ignore
        $this->assertLastSql( 'BEGIN; DELETE FROM x WHERE field = \'1\'; DELETE FROM error WHERE 1; ROLLBACK' );
    }
 
    public function testTransactionStatementRollbackIgnoring() {
        $wrapper = TestingAccessWrapper::newFromObject( $this->database );
        $warning = [];
        $wrapper->deprecationLogger = function ( $msg ) use ( &$warning ) {
            $warning[] = $msg;
        };
 
        $doError = function () {
            $this->database->forceNextQueryError( 666, 'Evilness', [
                'wasKnownStatementRollbackError' => true,
            ] );
            try {
                $this->database->delete( 'error', '1', __CLASS__ . '::SomeCaller' );
                $this->fail( 'Expected exception not thrown' );
            } catch ( DBError $e ) {
                $this->assertSame( 666, $e->errno );
            }
        };
        $expectWarning = 'Caller from ' . __METHOD__ .
            ' ignored an error originally raised from ' . __CLASS__ . '::SomeCaller: [666] Evilness';
 
        // Rollback doesn't raise a warning
        $warning = [];
        $this->database->startAtomic( __METHOD__ );
        call_user_func( $doError );
        $this->database->rollback( __METHOD__ );
        $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
        $this->assertSame( [], $warning );
        // phpcs:ignore
        $this->assertLastSql( 'BEGIN; DELETE FROM error WHERE 1; ROLLBACK; DELETE FROM x WHERE field = \'1\'' );
 
        // cancelAtomic() doesn't raise a warning
        $warning = [];
        $this->database->begin( __METHOD__ );
        $this->database->startAtomic( __METHOD__, Database::ATOMIC_CANCELABLE );
        call_user_func( $doError );
        $this->database->cancelAtomic( __METHOD__ );
        $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
        $this->database->commit( __METHOD__ );
        $this->assertSame( [], $warning );
        // phpcs:ignore
        $this->assertLastSql( 'BEGIN; SAVEPOINT wikimedia_rdbms_atomic1; DELETE FROM error WHERE 1; ROLLBACK TO SAVEPOINT wikimedia_rdbms_atomic1; DELETE FROM x WHERE field = \'1\'; COMMIT' );
 
        // Commit does raise a warning
        $warning = [];
        $this->database->begin( __METHOD__ );
        call_user_func( $doError );
        $this->database->commit( __METHOD__ );
        $this->assertSame( [ $expectWarning ], $warning );
        $this->assertLastSql( 'BEGIN; DELETE FROM error WHERE 1; COMMIT' );
 
        // Deprecation only gets raised once
        $warning = [];
        $this->database->begin( __METHOD__ );
        call_user_func( $doError );
        $this->database->delete( 'x', [ 'field' => 1 ], __METHOD__ );
        $this->database->commit( __METHOD__ );
        $this->assertSame( [ $expectWarning ], $warning );
        // phpcs:ignore
        $this->assertLastSql( 'BEGIN; DELETE FROM error WHERE 1; DELETE FROM x WHERE field = \'1\'; COMMIT' );
    }
 
    public function testPrematureClose1() {
        $fname = __METHOD__;
        $this->database->begin( __METHOD__ );
        $this->database->onTransactionIdle( function () use ( $fname ) {
            $this->database->query( 'SELECT 1', $fname );
        } );
        $this->database->delete( 'x', [ 'field' => 3 ], __METHOD__ );
        $this->database->close();
 
        $this->assertFalse( $this->database->isOpen() );
        $this->assertLastSql( 'BEGIN; DELETE FROM x WHERE field = \'3\'; COMMIT; SELECT 1' );
        $this->assertEquals( 0, $this->database->trxLevel() );
    }
 
    public function testPrematureClose2() {
        try {
            $fname = __METHOD__;
            $this->database->startAtomic( __METHOD__ );
            $this->database->onTransactionIdle( function () use ( $fname ) {
                $this->database->query( 'SELECT 1', $fname );
            } );
            $this->database->delete( 'x', [ 'field' => 3 ], __METHOD__ );
            $this->database->close();
            $this->fail( 'Expected exception not thrown' );
        } catch ( DBUnexpectedError $ex ) {
            $this->assertSame(
                'Wikimedia\Rdbms\Database::close: atomic sections ' .
                'DatabaseSQLTest::testPrematureClose2 are still open.',
                $ex->getMessage()
            );
        }
 
        $this->assertFalse( $this->database->isOpen() );
        $this->assertLastSql( 'BEGIN; DELETE FROM x WHERE field = \'3\'; ROLLBACK' );
        $this->assertEquals( 0, $this->database->trxLevel() );
    }
 
    public function testPrematureClose3() {
        try {
            $this->database->setFlag( IDatabase::DBO_TRX );
            $this->database->delete( 'x', [ 'field' => 3 ], __METHOD__ );
            $this->assertEquals( 1, $this->database->trxLevel() );
            $this->database->close();
            $this->fail( 'Expected exception not thrown' );
        } catch ( DBUnexpectedError $ex ) {
            $this->assertSame(
                'Wikimedia\Rdbms\Database::close: ' .
                'mass commit/rollback of peer transaction required (DBO_TRX set).',
                $ex->getMessage()
            );
        }
 
        $this->assertFalse( $this->database->isOpen() );
        $this->assertLastSql( 'BEGIN; DELETE FROM x WHERE field = \'3\'; ROLLBACK' );
        $this->assertEquals( 0, $this->database->trxLevel() );
    }
 
    public function testPrematureClose4() {
        $this->database->setFlag( IDatabase::DBO_TRX );
        $this->database->query( 'SELECT 1', __METHOD__ );
        $this->assertEquals( 1, $this->database->trxLevel() );
        $this->database->close();
        $this->database->clearFlag( IDatabase::DBO_TRX );
 
        $this->assertFalse( $this->database->isOpen() );
        $this->assertLastSql( 'BEGIN; SELECT 1; COMMIT' );
        $this->assertEquals( 0, $this->database->trxLevel() );
    }
}