*/
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.
$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
*