* @ingroup Database
*/
interface IDatabase {
+ /* Constants to onTransactionResolution() callbacks */
+ const TRIGGER_IDLE = 1;
+ const TRIGGER_COMMIT = 2;
+ const TRIGGER_ROLLBACK = 3;
+
/**
* A string describing the current software version, and possibly
* other details in a user-friendly way. Will be listed on Special:Version, etc.
*
* Example:
* $id = $dbw->nextSequenceValue( 'page_page_id_seq' );
- * $dbw->insert( 'page', array( 'page_id' => $id ) );
+ * $dbw->insert( 'page', [ 'page_id' => $id ] );
* $id = $dbw->insertId();
*
* @return int
* May be either an array of table names, or a single string holding a table
* name. If an array is given, table aliases can be specified, for example:
*
- * array( 'a' => 'user' )
+ * [ 'a' => 'user' ]
*
* This includes the user table in the query, with the alias "a" available
* for use in field names (e.g. a.user_name).
* can be complete fragments of SQL, for direct inclusion into the SELECT
* query. If an array is given, field aliases can be specified, for example:
*
- * array( 'maxrev' => 'MAX(rev_id)' )
+ * [ 'maxrev' => 'MAX(rev_id)' ]
*
* This includes an expression with the alias "maxrev" in the query.
*
* including them in the array as a string value with a numeric key, for
* example:
*
- * array( 'FOR UPDATE' )
+ * [ 'FOR UPDATE' ]
*
* The supported options are:
*
* an SQL fragment, or an array where the string keys are equality and the
* numeric keys are SQL fragments all AND'd together. For example:
*
- * array( 'page' => array( 'LEFT JOIN', 'page_latest=rev_id' ) )
+ * [ 'page' => [ 'LEFT JOIN', 'page_latest=rev_id' ] ]
*
* @return ResultWrapper|bool If the query returned no rows, a ResultWrapper
* with no rows in it will be returned. If there was a query error, a
* The keys on each level may be either integers or strings.
*
* @param array $data Organized as 2-d
- * array(baseKeyVal => array(subKeyVal => [ignored], ...), ...)
+ * [ baseKeyVal => [ subKeyVal => [ignored], ... ], ... ]
* @param string $baseKey Field name to match the base-level keys to (eg 'pl_namespace')
* @param string $subKey Field name to match the sub-level keys to (eg 'pl_title')
* @return string|bool SQL fragment, or false if no items in array
* Example: $dbr->buildLike( 'My_page_title/', $dbr->anyString() ) returns
* a LIKE clause that searches for subpages of 'My page title'.
* Alternatively:
- * $pattern = array( 'My_page_title/', $dbr->anyString() );
+ * $pattern = [ 'My_page_title/', $dbr->anyString() ];
* $query .= $dbr->buildLike( $pattern );
*
* @since 1.16
* to include in a join.
*
* @param array $varMap Must be an associative array of the form
- * array( 'dest1' => 'source1', ...). Source items may be literals
+ * [ 'dest1' => 'source1', ... ]. Source items may be literals
* rather than field names, but strings should be quoted with
* IDatabase::addQuotes()
*
public function getMasterPos();
/**
- * Run an anonymous function as soon as there is no transaction pending.
+ * @return bool Whether the DB is marked as read-only server-side
+ * @since 1.28
+ */
+ public function serverIsReadOnly();
+
+ /**
+ * Run a callback as soon as the current transaction commits or rolls back.
+ * An error is thrown if no transaction is pending. Queries in the function will run in
+ * AUTO-COMMIT mode unless there are begin() calls. Callbacks must commit any transactions
+ * that they begin.
+ *
+ * This is useful for combining cooperative locks and DB transactions.
+ *
+ * The callback takes one argument:
+ * How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_ROLLBACK)
+ *
+ * @param callable $callback
+ * @return mixed
+ * @since 1.28
+ */
+ public function onTransactionResolution( callable $callback );
+
+ /**
+ * Run a callback as soon as there is no transaction pending.
* If there is a transaction and it is rolled back, then the callback is cancelled.
* Queries in the function will run in AUTO-COMMIT mode unless there are begin() calls.
* Callbacks must commit any transactions that they begin.
*
* Updates will execute in the order they were enqueued.
*
+ * The callback takes one argument:
+ * How the transaction ended (IDatabase::TRIGGER_COMMIT or IDatabase::TRIGGER_IDLE)
+ *
* @param callable $callback
* @since 1.20
*/
- public function onTransactionIdle( $callback );
+ public function onTransactionIdle( callable $callback );
/**
- * Run an anonymous function before the current transaction commits or now if there is none.
+ * Run a callback before the current transaction commits or now if there is none.
* If there is a transaction and it is rolled back, then the callback is cancelled.
- * Callbacks must not start nor commit any transactions.
+ * Callbacks must not start nor commit any transactions. If no transaction is active,
+ * then a transaction will wrap the callback.
*
* This is useful for updates that easily cause deadlocks if locks are held too long
* but where atomicity is strongly desired for these updates and some related updates.
* @param callable $callback
* @since 1.22
*/
- public function onTransactionPreCommitOrIdle( $callback );
+ public function onTransactionPreCommitOrIdle( callable $callback );
/**
* Begin an atomic section of statements
dépôts / lhc / web / wiklou.git / blobdiff