*/
namespace Wikimedia\Rdbms;
+use InvalidArgumentException;
use Wikimedia\ScopedCallback;
use RuntimeException;
use UnexpectedValueException;
public function getType();
/**
- * Open a connection to the database. Usually aborts on failure
+ * Open a new connection to the database (closing any existing one)
*
* @param string $server Database server host
* @param string $user Database user name
public function getServerVersion();
/**
- * Closes a database connection.
- * if it is open : commits any open transactions
+ * Close the database connection
+ *
+ * This should only be called after any transactions have been resolved,
+ * aside from read-only transactions (assuming no callbacks are registered).
+ * If a transaction is still open anyway, it will be committed if possible.
*
* @throws DBError
* @return bool Operation success. true if already closed.
* Example usage:
* @code
* $sql = $db->makeList( [
- * 'rev_user' => $id,
+ * 'rev_page' => $id,
* $db->makeList( [ 'rev_minor' => 1, 'rev_len' < 500 ], $db::LIST_OR ] )
* ], $db::LIST_AND );
* @endcode
- * This would set $sql to "rev_user = '$id' AND (rev_minor = '1' OR rev_len < '500')"
+ * This would set $sql to "rev_page = '$id' AND (rev_minor = '1' OR rev_len < '500')"
*
* @param array $a Containing the data
* @param int $mode IDatabase class constant:
$delim, $table, $field, $conds = '', $join_conds = []
);
+ /**
+ * Build a SUBSTRING function.
+ *
+ * Behavior for non-ASCII values is undefined.
+ *
+ * @param string $input Field name
+ * @param int $startPosition Positive integer
+ * @param int|null $length Non-negative integer length or null for no limit
+ * @throws InvalidArgumentException
+ * @return string SQL text
+ * @since 1.31
+ */
+ public function buildSubString( $input, $startPosition, $length = null );
+
/**
* @param string $field Field or column to cast
* @return string
*/
public function buildStringCast( $field );
+ /**
+ * @param string $field Field or column to cast
+ * @return string
+ * @since 1.31
+ */
+ public function buildIntegerCast( $field );
+
/**
* Returns true if DBs are assumed to be on potentially different servers
*
* @param string $fname The function name of the caller, from __METHOD__
*
* @param array $insertOptions Options for the INSERT part of the query, see
- * IDatabase::insert() for details.
+ * IDatabase::insert() for details. Also, one additional option is
+ * available: pass 'NO_AUTO_COLUMNS' to hint that the query does not use
+ * an auto-increment or sequence to determine any column values.
* @param array $selectOptions Options for the SELECT part of the query, see
* IDatabase::select() for details.
* @param array $selectJoinConds Join conditions for the SELECT part of the query, see
public function setSchemaVars( $vars );
/**
- * Check to see if a named lock is available (non-blocking)
+ * Check to see if a named lock is not locked by any thread (non-blocking)
*
* @param string $lockName Name of lock to poll
* @param string $method Name of method calling us
* @since 1.28
*/
public function setTableAliases( array $aliases );
+
+ /**
+ * Convert certain index names to alternative names before querying the DB
+ *
+ * Note that this applies to indexes regardless of the table they belong to.
+ *
+ * This can be employed when an index was renamed X => Y in code, but the new Y-named
+ * indexes were not yet built on all DBs. After all the Y-named ones are added by the DBA,
+ * the aliases can be removed, and then the old X-named indexes dropped.
+ *
+ * @param string[] $aliases
+ * @return mixed
+ * @since 1.31
+ */
+ public function setIndexAliases( array $aliases );
}
class_alias( IDatabase::class, 'IDatabase' );