/** @var string Transaction is requested internally via DBO_TRX/startAtomic() */
const TRANSACTION_INTERNAL = 'implicit';
+ /** @var string Atomic section is not cancelable */
+ const ATOMIC_NOT_CANCELABLE = '';
+ /** @var string Atomic section is cancelable */
+ const ATOMIC_CANCELABLE = 'cancelable';
+
/** @var string Transaction operation comes from service managing all DBs */
const FLUSHING_ALL_PEERS = 'flush';
/** @var string Transaction operation comes from the database class internally */
* Should return true if unsure.
*
* @return bool
+ * @deprecated Since 1.31; use lastDoneWrites()
*/
public function doneWrites();
*/
public function lastError();
- /**
- * mysql_fetch_field() wrapper
- * Returns false if the field doesn't exist
- *
- * @param string $table Table name
- * @param string $field Field name
- *
- * @return Field
- */
- public function fieldInfo( $table, $field );
-
/**
* Get the number of rows affected by the last write query
* @see https://secure.php.net/mysql_affected_rows
*/
public function close();
- /**
- * @param string $error Fallback error message, used if none is given by DB
- * @throws DBConnectionError
- */
- public function reportConnectionError( $error = 'Unknown error' );
-
/**
* Run an SQL query and return the result. Normally throws a DBQueryError
* on failure. If errors are ignored, returns false instead.
*/
public function query( $sql, $fname = __METHOD__, $tempIgnore = false );
- /**
- * Report a query error. Log the error, and if neither the object ignore
- * flag nor the $tempIgnore flag is set, throw a DBQueryError.
- *
- * @param string $error
- * @param int $errno
- * @param string $sql
- * @param string $fname
- * @param bool $tempIgnore
- * @throws DBQueryError
- */
- public function reportQueryError( $error, $errno, $sql, $fname, $tempIgnore = false );
-
/**
* Free a result object returned by query() or select(). It's usually not
* necessary to call this, just use unset() or let the variable holding
* This includes the user table in the query, with the alias "a" available
* for use in field names (e.g. a.user_name).
*
+ * A derived table, defined by the result of selectSQLText(), requires an alias
+ * key and a Subquery instance value which wraps the SQL query, for example:
+ *
+ * [ 'c' => new Subquery( 'SELECT ...' ) ]
+ *
* Joins using parentheses for grouping (since MediaWiki 1.31) may be
* constructed using nested arrays. For example,
*
* doing UNION queries, where the SQL text of each query is needed. In general,
* however, callers outside of Database classes should just use select().
*
+ * @see IDatabase::select()
+ *
* @param string|array $table Table name
* @param string|array $vars Field names
* @param string|array $conds Conditions
* @param string $fname Caller function name
* @param string|array $options Query options
* @param string|array $join_conds Join conditions
- *
- * @return string SQL query string.
- * @see IDatabase::select()
+ * @return string SQL query string
*/
public function selectSQLText(
$table, $vars, $conds = '', $fname = __METHOD__,
* Takes the same arguments as IDatabase::select().
*
* @param string $table Table name
- * @param string $vars Unused
+ * @param string $var Column for which NULL values are not counted [default "*"]
* @param array|string $conds Filters on the table
* @param string $fname Function name for profiling
* @param array $options Options for select
* @throws DBError
*/
public function estimateRowCount(
- $table, $vars = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
+ $table, $var = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
);
/**
* @since 1.27 Added $join_conds parameter
*
* @param array|string $tables Table names
- * @param string $vars Unused
+ * @param string $var Column for which NULL values are not counted [default "*"]
* @param array|string $conds Filters on the table
* @param string $fname Function name for profiling
* @param array $options Options for select
* @throws DBError
*/
public function selectRowCount(
- $tables, $vars = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
+ $tables, $var = '*', $conds = '', $fname = __METHOD__, $options = [], $join_conds = []
);
/**
*/
public function tableExists( $table, $fname = __METHOD__ );
- /**
- * Determines if a given index is unique
- *
- * @param string $table
- * @param string $index
- *
- * @return bool
- */
- public function indexUnique( $table, $index );
-
/**
* INSERT wrapper, inserts an array into a table.
*
*/
public function buildIntegerCast( $field );
+ /**
+ * Equivalent to IDatabase::selectSQLText() except wraps the result in Subqyery
+ *
+ * @see IDatabase::selectSQLText()
+ *
+ * @param string|array $table Table name
+ * @param string|array $vars Field names
+ * @param string|array $conds Conditions
+ * @param string $fname Caller function name
+ * @param string|array $options Query options
+ * @param string|array $join_conds Join conditions
+ * @return Subquery
+ * @since 1.31
+ */
+ public function buildSelectSubquery(
+ $table, $vars, $conds = '', $fname = __METHOD__,
+ $options = [], $join_conds = []
+ );
+
/**
* Returns true if DBs are assumed to be on potentially different servers
*
/**
* Begin an atomic section of statements
*
- * If a transaction has been started already, just keep track of the given
- * section name to make sure the transaction is not committed pre-maturely.
- * This function can be used in layers (with sub-sections), so use a stack
- * to keep track of the different atomic sections. If there is no transaction,
- * start one implicitly.
+ * If a transaction has been started already, (optionally) sets a savepoint
+ * and tracks the given section name to make sure the transaction is not
+ * committed pre-maturely. This function can be used in layers (with
+ * sub-sections), so use a stack to keep track of the different atomic
+ * sections. If there is no transaction, one is started implicitly.
*
* The goal of this function is to create an atomic section of SQL queries
* without having to start a new transaction if it already exists.
*
- * All atomic levels *must* be explicitly closed using IDatabase::endAtomic(),
- * and any database transactions cannot be began or committed until all atomic
- * levels are closed. There is no such thing as implicitly opening or closing
- * an atomic section.
+ * All atomic levels *must* be explicitly closed using IDatabase::endAtomic()
+ * or IDatabase::cancelAtomic(), and any database transactions cannot be
+ * began or committed until all atomic levels are closed. There is no such
+ * thing as implicitly opening or closing an atomic section.
*
* @since 1.23
* @param string $fname
+ * @param string $cancelable Pass self::ATOMIC_CANCELABLE to use a
+ * savepoint and enable self::cancelAtomic() for this section.
* @throws DBError
*/
- public function startAtomic( $fname = __METHOD__ );
+ public function startAtomic( $fname = __METHOD__, $cancelable = self::ATOMIC_NOT_CANCELABLE );
/**
* Ends an atomic section of SQL statements
*/
public function endAtomic( $fname = __METHOD__ );
+ /**
+ * Cancel an atomic section of SQL statements
+ *
+ * This will roll back only the statements executed since the start of the
+ * most recent atomic section, and close that section. If a transaction was
+ * open before the corresponding startAtomic() call, any statements before
+ * that call are *not* rolled back and the transaction remains open. If the
+ * corresponding startAtomic() implicitly started a transaction, that
+ * transaction is rolled back.
+ *
+ * Note that a call to IDatabase::rollback() will also roll back any open
+ * atomic sections.
+ *
+ * @note As a micro-optimization to save a few DB calls, this method may only
+ * be called when startAtomic() was called with the ATOMIC_CANCELABLE flag.
+ * @since 1.31
+ * @see IDatabase::startAtomic
+ * @param string $fname
+ * @throws DBError
+ */
+ public function cancelAtomic( $fname = __METHOD__ );
+
/**
* Run a callback to do an atomic set of updates for this database
*
* - This database object
* - The value of $fname
*
- * If any exception occurs in the callback, then rollback() will be called and the error will
- * be re-thrown. It may also be that the rollback itself fails with an exception before then.
- * In any case, such errors are expected to terminate the request, without any outside caller
- * attempting to catch errors and commit anyway. Note that any rollback undoes all prior
- * atomic section and uncommitted updates, which trashes the current request, requiring an
- * error to be displayed.
+ * If any exception occurs in the callback, then cancelAtomic() will be
+ * called to back out any statements executed by the callback and the error
+ * will be re-thrown. It may also be that the cancel itself fails with an
+ * exception before then. In any case, such errors are expected to
+ * terminate the request, without any outside caller attempting to catch
+ * errors and commit anyway.
*
- * This can be an alternative to explicit startAtomic()/endAtomic() calls.
+ * This can be an alternative to explicit startAtomic()/endAtomic()/cancelAtomic() calls.
*
* @see Database::startAtomic
* @see Database::endAtomic
+ * @see Database::cancelAtomic
*
* @param string $fname Caller name (usually __METHOD__)
* @param callable $callback Callback that issues DB updates
* @throws DBError
* @throws RuntimeException
* @throws UnexpectedValueException
- * @since 1.27
+ * @since 1.27; prior to 1.31 this did a rollback() instead of
+ * cancelAtomic(), and assumed no callers up the stack would ever try to
+ * catch the exception.
*/
public function doAtomicSection( $fname, callable $callback );
*/
public function flushSnapshot( $fname = __METHOD__ );
- /**
- * List all tables on the database
- *
- * @param string $prefix Only show tables with this prefix, e.g. mw_
- * @param string $fname Calling function name
- * @throws DBError
- * @return array
- */
- public function listTables( $prefix = null, $fname = __METHOD__ );
-
/**
* Convert a timestamp in one of the formats accepted by wfTimestamp()
* to the format used for inserting into timestamp fields in this DBMS.
public function ping( &$rtt = null );
/**
- * Get replica DB lag. Currently supported only by MySQL.
+ * Get the amount of replication lag for this database server
*
- * Note that this function will generate a fatal error on many
- * installations. Most callers should use LoadBalancer::safeGetLag()
- * instead.
+ * Callers should avoid using this method while a transaction is active
*
* @return int|bool Database replication lag in seconds or false on error
* @throws DBError
dépôts / lhc / web / wiklou.git / blobdiff