Question

I’ve got a trivial MySQL function:

DELIMITER $$ DROP FUNCTION IF EXISTS `mydb`.`CALC` $$ CREATE FUNCTION `mydb`.`CALC_IT`(Flag VARCHAR(1), One FLOAT, Other FLOAT)  RETURNS FLOAT BEGIN     IF One IS NULL THEN RETURN 0; END IF;     IF Other IS NULL THEN RETURN 0; END IF;     IF Flag = 'Y' THEN         RETURN Other - One;     ELSE         RETURN Other     END IF; END $$ DELIMITER ; 

And it’s called in a query from PHP using a PDO connection:

$query = 'SELECT CALC_IT(`Flag`, `One`, `Two`) FROM `mydb`.`table` WHERE `Condition` = 1'; $db = new PDO('mysql:host=localhost', 'user', 'pass'); $stmt = $db->prepare($query); if (!$stmt->execute()) {     var_dump($stmt->errorInfo()); } 

But, it reports the following:

array   0 => string '42000' (length=5)   1 => int 1305   2 => string 'FUNCTION CALC_IT does not exist' (length=37) 

And, if you try it with the legacy Mysql code, it works:

$db = mysql_connect('localhost', 'user', 'pass'); $result = mysql_query($query); if (mysql_error()) {     var_dump(mysql_error()); } 

The query also works if you try it with any other mysql client.

So why doesn’t some user defined MySQL functions work in PHP’s PDO library?

Answer 1

new PDO(‘mysql:host=localhost’, ‘user’, ‘pass’);

Missing dbname=mydb?

it will be mydb.CALC_IT

Yep, that’s a possibility. There are advantages and disadvantages to selecting a database at connect-time rather than explicitly specifying it in the query. If you’re only using a single database on the server it tends to be easier to say so at connect-time and handle the possible access-rights errors then, but if you’re doing cross-db work the explicit way “mydb.CALC_IT” will be necessary.