(PECL maxdb >= 1.0) Returns a string description of the last error

(PHP 4 >= 4.2.0, PHP 5, PHP 7) Reset connection (reconnect)

(PHP 4, PHP <=5.2.0) Get row as an associative array

(PHP 4, PHP <=5.2.0) Get number of rows affected by a query

(PHP 4 <= 4.1.0, PECL dbplus >= 0.9) Creates a new DB++ relation

(PECL mongo >=1.3.0) Get the read preference for this connection

(PHP 5 < 5.4.0, PECL sqlite >= 1.0.0) Fetches a column from the current row of a result set

(PECL paradox >= 1.0.0) Sets the name of a table (deprecated)

(PECL mongo >=0.9.0) Creates a database reference

(PHP 5, PHP 7) Selects the default database for database queries