MySQL存储过程

Question

I have a few questions regarding stored procedures. After hours of googling, I really can't find any really simple query examples.

CREATE PROCEDURE test1(IN uid INT)
BEGIN
    SELECT USER_NAME FROM USERS WHERE USER_ID = uid;
END //

this query takes 'uid' as input and selects the username for that uid, Can someone please explain how I call that procedure in php and also, how do I output the actual rows to the php var?

Answer 1

AFAIK you just need to put call before it in the query:

$result = mysql_query("CALL test1(".$args.")");
$username = mysql_result($result);

Answer 2

You should consider doing this with a stored function that returns a single VARCHAR:

CREATE FUNCTION test1(uid INT) RETURNS VARCHAR(100)
BEGIN
    DECLARE V_RETURN_VAL VARCHAR(100);

    SELECT USER_NAME 
    INTO V_RETURN_VAL
    FROM USERS 
    WHERE USER_ID = uid;

    RETURN V_RETURN_VAL;
END //

Answer 3

You can just use "CALL" and retrieve the rows as if it were a normal query.

The only case where it is different is if the procedure returns multiple result sets, in which case you MUST go through them all (even empty ones) with a method which gives the next result set.

OUT parameters are a waste of time as they require more round-trips and server-side state to fetch their results; you invariably write more code and have more bugs if you use them.