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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\Rdbms; |
| 4 | |
| 5 | use InvalidArgumentException; |
| 6 | use UnexpectedValueException; |
| 7 | |
| 8 | /** |
| 9 | * Build UPDATE queries with a fluent interface. |
| 10 | * |
| 11 | * Each query builder object must be used for a single database query only, |
| 12 | * and not be reused afterwards. To run multiple similar queries, you can |
| 13 | * create a query builder to set up most of your query, which you can use |
| 14 | * as a "template" to clone. You can then modify the cloned object for |
| 15 | * each individual query. |
| 16 | * |
| 17 | * @since 1.41 |
| 18 | * @stable to extend |
| 19 | * @ingroup Database |
| 20 | */ |
| 21 | class UpdateQueryBuilder { |
| 22 | /** |
| 23 | * @var string The table name to be passed to IDatabase::update() |
| 24 | */ |
| 25 | private $table = ''; |
| 26 | |
| 27 | /** |
| 28 | * @var array The set values to be passed to IDatabase::update() |
| 29 | */ |
| 30 | private $set = []; |
| 31 | |
| 32 | /** |
| 33 | * @var array The conditions to be passed to IDatabase::update() |
| 34 | */ |
| 35 | private $conds = []; |
| 36 | |
| 37 | /** |
| 38 | * @var string The caller (function name) to be passed to IDatabase::update() |
| 39 | */ |
| 40 | private $caller = __CLASS__; |
| 41 | |
| 42 | /** |
| 43 | * @var array The options to be passed to IDatabase::update() |
| 44 | */ |
| 45 | protected $options = []; |
| 46 | |
| 47 | /** @var IDatabase */ |
| 48 | protected $db; |
| 49 | |
| 50 | /** |
| 51 | * Only for use in subclasses. To create a UpdateQueryBuilder instance, |
| 52 | * use `$db->newUpdateQueryBuilder()` instead. |
| 53 | * |
| 54 | * @param IDatabase $db |
| 55 | */ |
| 56 | public function __construct( IDatabase $db ) { |
| 57 | $this->db = $db; |
| 58 | } |
| 59 | |
| 60 | /** |
| 61 | * Change the IDatabase object the query builder is bound to. The specified |
| 62 | * IDatabase will subsequently be used to execute the query. |
| 63 | * |
| 64 | * @param IDatabase $db |
| 65 | * @return $this |
| 66 | */ |
| 67 | public function connection( IDatabase $db ) { |
| 68 | if ( $this->db->getType() !== $db->getType() ) { |
| 69 | throw new InvalidArgumentException( |
| 70 | __METHOD__ . ' cannot switch to a database of a different type.' |
| 71 | ); |
| 72 | } |
| 73 | $this->db = $db; |
| 74 | return $this; |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * Set the query parameters to the given values, appending to the values |
| 79 | * which were already set. This can be used to interface with legacy code. |
| 80 | * If a key is omitted, the previous value will be retained. |
| 81 | * |
| 82 | * The parameters must be formatted as required by Database::update. |
| 83 | * |
| 84 | * @param array $info Associative array of query info, with keys: |
| 85 | * - table: The table name to be passed to Database::update() |
| 86 | * - set: The set conditions |
| 87 | * - conds: The conditions |
| 88 | * - options: The query options |
| 89 | * - caller: The caller signature. |
| 90 | * |
| 91 | * @return $this |
| 92 | */ |
| 93 | public function queryInfo( $info ) { |
| 94 | if ( isset( $info['table'] ) ) { |
| 95 | $this->table( $info['table'] ); |
| 96 | } |
| 97 | if ( isset( $info['set'] ) ) { |
| 98 | $this->set( $info['set'] ); |
| 99 | } |
| 100 | if ( isset( $info['conds'] ) ) { |
| 101 | $this->where( $info['conds'] ); |
| 102 | } |
| 103 | if ( isset( $info['options'] ) ) { |
| 104 | $this->options( (array)$info['options'] ); |
| 105 | } |
| 106 | if ( isset( $info['caller'] ) ) { |
| 107 | $this->caller( $info['caller'] ); |
| 108 | } |
| 109 | return $this; |
| 110 | } |
| 111 | |
| 112 | /** |
| 113 | * Manually set the table name to be passed to IDatabase::update() |
| 114 | * |
| 115 | * @param string $table The table name |
| 116 | * @param-taint $table exec_sql |
| 117 | * @return $this |
| 118 | */ |
| 119 | public function table( $table ) { |
| 120 | $this->table = $table; |
| 121 | return $this; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Set table for the query. Alias for table(). |
| 126 | * |
| 127 | * @param string $table The table name |
| 128 | * @param-taint $table exec_sql |
| 129 | * @return $this |
| 130 | */ |
| 131 | public function update( string $table ) { |
| 132 | return $this->table( $table ); |
| 133 | } |
| 134 | |
| 135 | /** |
| 136 | * Manually set an option in the $options array to be passed to |
| 137 | * IDatabase::update() |
| 138 | * |
| 139 | * @param string $name The option name |
| 140 | * @param mixed $value The option value, or null for a boolean option |
| 141 | * @return $this |
| 142 | */ |
| 143 | public function option( $name, $value = null ) { |
| 144 | if ( $value === null ) { |
| 145 | $this->options[] = $name; |
| 146 | } else { |
| 147 | $this->options[$name] = $value; |
| 148 | } |
| 149 | return $this; |
| 150 | } |
| 151 | |
| 152 | /** |
| 153 | * Manually set multiple options in the $options array to be passed to |
| 154 | * IDatabase::update(). |
| 155 | * |
| 156 | * @param array $options |
| 157 | * @return $this |
| 158 | */ |
| 159 | public function options( array $options ) { |
| 160 | $this->options = array_merge( $this->options, $options ); |
| 161 | return $this; |
| 162 | } |
| 163 | |
| 164 | /** |
| 165 | * Add conditions to the query. The supplied conditions will be appended |
| 166 | * to the existing conditions, separated by AND. |
| 167 | * |
| 168 | * @param string|array|IExpression $conds |
| 169 | * @param-taint $conds exec_sql_numkey |
| 170 | * |
| 171 | * May be either a string containing a single condition, or an array of |
| 172 | * conditions. If an array is given, the conditions constructed from each |
| 173 | * element are combined with AND. |
| 174 | * |
| 175 | * Array elements may take one of two forms: |
| 176 | * |
| 177 | * - Elements with a numeric key are interpreted as raw SQL fragments. |
| 178 | * - Elements with a string key are interpreted as equality conditions, |
| 179 | * where the key is the field name. |
| 180 | * - If the value of such an array element is a scalar (such as a |
| 181 | * string), it will be treated as data and thus quoted appropriately. |
| 182 | * If it is null, an IS NULL clause will be added. |
| 183 | * - If the value is an array, an IN (...) clause will be constructed |
| 184 | * from its non-null elements, and an IS NULL clause will be added |
| 185 | * if null is present, such that the field may match any of the |
| 186 | * elements in the array. The non-null elements will be quoted. |
| 187 | * |
| 188 | * Note that expressions are often DBMS-dependent in their syntax. |
| 189 | * DBMS-independent wrappers are provided for constructing several types of |
| 190 | * expression commonly used in condition queries. See: |
| 191 | * - IDatabase::buildLike() |
| 192 | * - IDatabase::conditional() |
| 193 | * |
| 194 | * Untrusted user input is safe in the values of string keys, however untrusted |
| 195 | * input must not be used in the array key names or in the values of numeric keys. |
| 196 | * Escaping of untrusted input used in values of numeric keys should be done via |
| 197 | * IDatabase::addQuotes() |
| 198 | * |
| 199 | * @return $this |
| 200 | */ |
| 201 | public function where( $conds ) { |
| 202 | if ( is_array( $conds ) ) { |
| 203 | foreach ( $conds as $key => $cond ) { |
| 204 | if ( is_int( $key ) ) { |
| 205 | $this->conds[] = $cond; |
| 206 | } elseif ( isset( $this->conds[$key] ) ) { |
| 207 | // @phan-suppress-previous-line PhanTypeMismatchDimFetch |
| 208 | // T288882 |
| 209 | $this->conds[] = $this->db->makeList( |
| 210 | [ $key => $cond ], IDatabase::LIST_AND ); |
| 211 | } else { |
| 212 | $this->conds[$key] = $cond; |
| 213 | } |
| 214 | } |
| 215 | } else { |
| 216 | $this->conds[] = $conds; |
| 217 | } |
| 218 | return $this; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Add conditions to the query. Alias for where(). |
| 223 | * |
| 224 | * @param string|array|IExpression $conds |
| 225 | * @param-taint $conds exec_sql_numkey |
| 226 | * @return $this |
| 227 | */ |
| 228 | public function andWhere( $conds ) { |
| 229 | return $this->where( $conds ); |
| 230 | } |
| 231 | |
| 232 | /** |
| 233 | * Add conditions to the query. Alias for where(). |
| 234 | * |
| 235 | * @param string|array|IExpression $conds |
| 236 | * @param-taint $conds exec_sql_numkey |
| 237 | * @return $this |
| 238 | */ |
| 239 | public function conds( $conds ) { |
| 240 | return $this->where( $conds ); |
| 241 | } |
| 242 | |
| 243 | /** |
| 244 | * Add SET part to the query. It takes an array containing arrays of column names map to |
| 245 | * the set values. |
| 246 | * |
| 247 | * @param string|array $set |
| 248 | * @param-taint $set exec_sql_numkey |
| 249 | * |
| 250 | * Combination map/list where each string-keyed entry maps a column |
| 251 | * to a literal assigned value and each integer-keyed value is a SQL expression in the |
| 252 | * format of a column assignment within UPDATE...SET. The (column => value) entries are |
| 253 | * convenient due to automatic value quoting and conversion of null to NULL. The SQL |
| 254 | * assignment format is useful for updates like "column = column + X". All assignments |
| 255 | * have no defined execution order, so they should not depend on each other. Do not |
| 256 | * modify AUTOINCREMENT or UUID columns in assignments. |
| 257 | * |
| 258 | * Untrusted user input is safe in the values of string keys, however untrusted |
| 259 | * input must not be used in the array key names or in the values of numeric keys. |
| 260 | * Escaping of untrusted input used in values of numeric keys should be done via |
| 261 | * IDatabase::addQuotes() |
| 262 | * |
| 263 | * @return $this |
| 264 | */ |
| 265 | public function set( $set ) { |
| 266 | if ( is_array( $set ) ) { |
| 267 | foreach ( $set as $key => $value ) { |
| 268 | if ( is_int( $key ) ) { |
| 269 | $this->set[] = $value; |
| 270 | } else { |
| 271 | $this->set[$key] = $value; |
| 272 | } |
| 273 | } |
| 274 | } else { |
| 275 | $this->set[] = $set; |
| 276 | } |
| 277 | return $this; |
| 278 | } |
| 279 | |
| 280 | /** |
| 281 | * Add set values to the query. Alias for set(). |
| 282 | * |
| 283 | * @param string|array $set |
| 284 | * @param-taint $set exec_sql_numkey |
| 285 | * @return $this |
| 286 | */ |
| 287 | public function andSet( $set ) { |
| 288 | return $this->set( $set ); |
| 289 | } |
| 290 | |
| 291 | /** |
| 292 | * Enable the IGNORE option. |
| 293 | * |
| 294 | * Skip update of rows that would cause unique key conflicts. |
| 295 | * IDatabase::affectedRows() can be used to determine how many rows were updated. |
| 296 | * |
| 297 | * @return $this |
| 298 | */ |
| 299 | public function ignore() { |
| 300 | $this->options[] = 'IGNORE'; |
| 301 | return $this; |
| 302 | } |
| 303 | |
| 304 | /** |
| 305 | * Set the method name to be included in an SQL comment. |
| 306 | * |
| 307 | * @param string $fname |
| 308 | * @param-taint $fname exec_sql |
| 309 | * @return $this |
| 310 | */ |
| 311 | public function caller( $fname ) { |
| 312 | $this->caller = $fname; |
| 313 | return $this; |
| 314 | } |
| 315 | |
| 316 | /** |
| 317 | * Run the constructed UPDATE query. |
| 318 | */ |
| 319 | public function execute(): void { |
| 320 | if ( !$this->conds ) { |
| 321 | throw new UnexpectedValueException( |
| 322 | __METHOD__ . ' expects at least one condition to be set' ); |
| 323 | } |
| 324 | if ( !$this->set ) { |
| 325 | throw new UnexpectedValueException( |
| 326 | __METHOD__ . ' can\t have empty $set value' ); |
| 327 | } |
| 328 | if ( $this->table === '' ) { |
| 329 | throw new UnexpectedValueException( |
| 330 | __METHOD__ . ' expects table not to be empty' ); |
| 331 | } |
| 332 | $this->db->update( $this->table, $this->set, $this->conds, $this->caller, $this->options ); |
| 333 | } |
| 334 | |
| 335 | /** |
| 336 | * Get an associative array describing the query in terms of its raw parameters to |
| 337 | * Database::update(). This can be used to interface with legacy code. |
| 338 | * |
| 339 | * @return array The query info array, with keys: |
| 340 | * - table: The table name |
| 341 | * - set: The set array |
| 342 | * - conds: The conditions |
| 343 | * - options: The query options |
| 344 | * - caller: The caller signature |
| 345 | */ |
| 346 | public function getQueryInfo() { |
| 347 | $info = [ |
| 348 | 'table' => $this->table, |
| 349 | 'set' => $this->set, |
| 350 | 'conds' => $this->conds, |
| 351 | 'options' => $this->options, |
| 352 | ]; |
| 353 | if ( $this->caller !== __CLASS__ ) { |
| 354 | $info['caller'] = $this->caller; |
| 355 | } |
| 356 | return $info; |
| 357 | } |
| 358 | } |