*/
namespace Wikimedia\Rdbms;
+use InvalidArgumentException;
use Wikimedia\ScopedCallback;
use RuntimeException;
use UnexpectedValueException;
$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
*
* @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' );