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phpmysqlsqlstored-proceduresmysqli
Nikk
Nikk

Reputation: 7891

MySQL Stored Procedure returns 0 rows

When I call the Procedure like so in phpMyAdmin (SQL tab), it works:

CALL `test_discount`('022979', 1101, 1, 'W', 100, @p5); SELECT @p5 AS `discount`;

However when I call it in PHP like so:

$res = $conn->query("CALL `test_discount`('022979', 1101, 1, 'W', 100, @p5); SELECT @p5 AS `discount`;");

I get a syntax error: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'SELECT @p5 AS discount' at line 1

How do I get this to work in PHP?

Upvotes: 1

Views: 468

Answers (1)

Syntactic Fructose
Syntactic Fructose

Reputation: 20076

The issue is that mySQL does not support multiple statements in a single query call: http://php.net/manual/en/mysqli.quickstart.multiple-statement.php

E.g. Given the following code (from the link above):

<?php
$mysqli = new mysqli("example.com", "user", "password", "database");
$res    = $mysqli->query("SELECT 1; DROP TABLE mysql.user");
if (!$res) {
    echo "Error executing query: (" . $mysqli->errno . ") " . $mysqli->error;
}
?>

You'll receive the following output:

Error executing query: (1064) 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 'DROP TABLE mysql.user' at line 1

Solution: Use a multi-query:

$mysqli->multi_query( "CALL `test_discount`('022979', 1101, 1, 'W', 100, @p5); SELECT @p5 AS `discount`;" );

EDIT: See also:

Example using multi_query to call a procedure:

$mysqli = new mysqli(  "HOST", "USR", "PWD", "DBNAME" );
$ivalue=1;
$res = $mysqli->multi_query( "CALL myproc($ivalue,@x);SELECT @x" );
if( $res ) {
  $results = 0;
  do {
    if ($result = $mysqli->store_result()) {
      printf( "<b>Result #%u</b>:<br/>", ++$results );
      while( $row = $result->fetch_row() ) {
        foreach( $row as $cell ) echo $cell, "&nbsp;";
      }
      $result->close();
      if( $mysqli->more_results() ) echo "<br/>";
    }
  } while( $mysqli->next_result() );
}
$mysqli->close();

Upvotes: 2

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