Mysql变量无法通过php mysql查询工作

Question

I have this query:

$query = " 

 SET @points := -1;
 SET @num := 0;

 SELECT `id`,`rank`,
 @num := if(@points = `rank`, @num, @num + 1) as `point_rank`
 FROM `said`
 ORDER BY `rank` *1 desc, `id` asc";

I'm using this query from php; giving me this error:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'SET @num := 0;

If I copy and paste that code in phpmyadmin Sql query panel, it works perfectly, but from the php code lines it's not working, seems like there's an issues while setting Vars.

Answer 1

Instead of setting the variables in a separate SET , have you tried using a CROSS JOIN :

$query = " 

SELECT `id`,
  `rank`,
  @num := if(@points = `rank`, @num, @num + 1) as `point_rank`
FROM `said`
CROSS JOIN (SELECT @points:=-1, @num:=0) c
ORDER BY `rank` *1 desc, `id` asc";

Answer 2

As we are viewing your code, you are trying to use MySql Stored procedure related syntax from PHP. Only ANSI Sql specific queries will be executed through PHP interface.

Otherwise you have to write MySql Stored Procedure and access the procedure through PHP Data objects - (PDO).

You can have following links helpful -

1> Stored Procedures, MySQL and PHP

2> http://www.joeyrivera.com/2009/using-mysql-stored-procedures-with-php-mysqlmysqlipdo/

3> http://php.net/manual/en/pdo.prepared-statements.php

Answer 3

try this

$result1 = mysql_query("SET @points := -1 ;");
$result2 = mysql_query("SET @num := 0;");
$result3 = mysql_query($this->query); // <-- without the SET ... query

From the Manual:

mysql_query() sends a unique query (multiple queries are not supported)

EDIT:

You should use PDO or mysqli as mysql will soon deprecated .