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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\Rdbms; |
| 4 | |
| 5 | class PostgresField implements Field { |
| 6 | private string $name; |
| 7 | private string $tablename; |
| 8 | private string $type; |
| 9 | private bool $nullable; |
| 10 | /** @var int */ |
| 11 | private $max_length; |
| 12 | private bool $deferred; |
| 13 | private bool $deferrable; |
| 14 | private ?string $conname; |
| 15 | private bool $has_default; |
| 16 | /** @var mixed */ |
| 17 | private $default; |
| 18 | |
| 19 | /** |
| 20 | * @param DatabasePostgres $db |
| 21 | * @param string $table |
| 22 | * @param string $field |
| 23 | * @return null|PostgresField |
| 24 | */ |
| 25 | public static function fromText( DatabasePostgres $db, $table, $field ) { |
| 26 | $q = <<<SQL |
| 27 | SELECT |
| 28 | attnotnull, attlen, conname AS conname, |
| 29 | atthasdef, |
| 30 | pg_get_expr(adbin, adrelid) AS adsrc, |
| 31 | COALESCE(condeferred, FALSE) AS deferred, |
| 32 | COALESCE(condeferrable, FALSE) AS deferrable, |
| 33 | CASE WHEN typname = 'int2' THEN 'smallint' |
| 34 | WHEN typname = 'int4' THEN 'integer' |
| 35 | WHEN typname = 'int8' THEN 'bigint' |
| 36 | WHEN typname = 'bpchar' THEN 'char' |
| 37 | ELSE typname END AS typname |
| 38 | FROM pg_class c |
| 39 | JOIN pg_namespace n ON (n.oid = c.relnamespace) |
| 40 | JOIN pg_attribute a ON (a.attrelid = c.oid) |
| 41 | JOIN pg_type t ON (t.oid = a.atttypid) |
| 42 | LEFT JOIN pg_constraint o ON (o.conrelid = c.oid AND a.attnum = ANY(o.conkey) AND o.contype = 'f') |
| 43 | LEFT JOIN pg_attrdef d on c.oid=d.adrelid and a.attnum=d.adnum |
| 44 | WHERE relkind = 'r' |
| 45 | AND nspname=%s |
| 46 | AND relname=%s |
| 47 | AND attname=%s; |
| 48 | SQL; |
| 49 | |
| 50 | foreach ( $db->getCoreSchemas() as $schema ) { |
| 51 | $res = $db->query( |
| 52 | sprintf( $q, |
| 53 | $db->addQuotes( $schema ), |
| 54 | $db->addQuotes( $db->tableName( $table, 'raw' ) ), |
| 55 | $db->addQuotes( $field ) |
| 56 | ), |
| 57 | __METHOD__ |
| 58 | ); |
| 59 | $row = $res->fetchObject(); |
| 60 | if ( !$row ) { |
| 61 | continue; |
| 62 | } |
| 63 | $n = new PostgresField; |
| 64 | $n->type = $row->typname; |
| 65 | $n->nullable = !$row->attnotnull; |
| 66 | $n->name = $field; |
| 67 | $n->tablename = $table; |
| 68 | $n->max_length = $row->attlen; |
| 69 | $n->deferrable = (bool)$row->deferrable; |
| 70 | $n->deferred = (bool)$row->deferred; |
| 71 | $n->conname = $row->conname; |
| 72 | $n->has_default = (bool)$row->atthasdef; |
| 73 | $n->default = $row->adsrc; |
| 74 | |
| 75 | return $n; |
| 76 | } |
| 77 | |
| 78 | return null; |
| 79 | } |
| 80 | |
| 81 | public function name() { |
| 82 | return $this->name; |
| 83 | } |
| 84 | |
| 85 | public function tableName() { |
| 86 | return $this->tablename; |
| 87 | } |
| 88 | |
| 89 | public function type() { |
| 90 | return $this->type; |
| 91 | } |
| 92 | |
| 93 | public function isNullable() { |
| 94 | return $this->nullable; |
| 95 | } |
| 96 | |
| 97 | public function maxLength() { |
| 98 | return $this->max_length; |
| 99 | } |
| 100 | |
| 101 | public function is_deferrable() { |
| 102 | return $this->deferrable; |
| 103 | } |
| 104 | |
| 105 | public function is_deferred() { |
| 106 | return $this->deferred; |
| 107 | } |
| 108 | |
| 109 | public function conname() { |
| 110 | return $this->conname; |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * @since 1.19 |
| 115 | * @return mixed|false |
| 116 | */ |
| 117 | public function defaultValue() { |
| 118 | if ( $this->has_default ) { |
| 119 | return $this->default; |
| 120 | } else { |
| 121 | return false; |
| 122 | } |
| 123 | } |
| 124 | } |