如何使用mysqli-> multi_query（）？

Question

Can anyone show me how to use mysqli->multi_query() to execute multiple update/ insert queries on a single connection? Thanks.

I did follow the tutorials in the PHP manual. But I have some issues.

My batch of queries has 5 statements separated by semicolons.

UPDATE scenes set UserID = '11111111' WHERE ID = '031DFDAD92F6F4AB64AF317C06D64089DF119EC2';

INSERT INTO surfaces (ID, Name, SceneID, SurfaceTypeID, Color) VALUES('5F9A7301C2D398C4D1B90BA5AA56A9DED3FAA639', 'front ', '031DFDAD92F6F4AB64AF317C06D64089DF119EC2', 1, 11432044);

INSERT INTO regions (ID, SurfaceID, x, y, width, height, RegionMovieClip) VALUES('864406A2CB30CFBE846ED7B0B08A79BD5605037D', '5F9A7301C2D398C4D1B90BA5AA56A9DED3FAA639', 375, 22, 104, 125, 'asdasdcvxcv');

INSERT INTO surfaces (ID, Name, SceneID, SurfaceTypeID, Color) VALUES('1FCA2131ED1B89206E4E66DBE20D8D09513FF39D', 'floor ', '031DFDAD92F6F4AB64AF317C06D64089DF119EC2', 1, 7318465);

INSERT INTO regions (ID, SurfaceID, x, y, width, height, RegionMovieClip) VALUES('DBD0E85EAEE2685E2AEC590C8CA214C3C5653971', '1FCA2131ED1B89206E4E66DBE20D8D09513FF39D', 272, 288, 114, 89, 'asdasd')

All are executed except for the 3rd query. That's where I'm lost. If there's an sql error inserting the 3rd query, how can I get it? And how the queries after the failed 3rd one is getting executed?

Answer 1

The examples don't really show how to handle an error.

Execution will stop after the first failure.

Use mysqli_error() to get error information.

mysqli_use_result() returns false if an error occured - if you count the results and there aren't enough, an error occurred.

Answer 2

This is not fool proof, but I have fought and fought with MySQLi and it's band of merry men involved with multi_query and I couldn't get it to play nicely the way I wanted to, or have the flexibility that I needed. I saw several examples where some programmers were simply running explode(';', $sql_statements) which made my eyes bleed with how horribly wrong that can be.

My solution may not work for you, but this worked for me. (no it's not bulletproof either, but does the job for my particular application).

<?php
    $file = file_get_contents('test_multiple_queries.sql');
    $result = preg_split("/;(?=\s*(create|insert|update|alter|show|explain|truncate|drop|delete|replace|start|lock|commit|rollback|set|begin|declare|rename|load|begin|describe|help))/im", $file);
    $result = array_map('trim', $result);

    foreach($result as $sql_query) {

        // Procedural style
        mysqli_query($link, $sql_query);

        // Now you can get errors easily, or affected_rows, or whatever
        //    using much simpler, readable code
        mysqli_error($link);
        mysqli_affected_rows($link);

        // or go crazy with some other stuff
        $words = preg_split("/\s+/", $sql_query);
        switch(strtolower($words[0])) {
            case 'insert':
                // do something nifty like...
                echo 'New ID: '.mysqli_insert_id($link)."\n";
                break;
            case 'drop':
                // obviously run this before the query, simply here for example
                echo 'Hey young (man|lady)! We don\'t drop anything!';
                break;
        }
    }

Answer 3

This is untested and will not handle errors but should run all 5 queries.

$fconn = new mysqli($fdbhost, $fdbuser, $fdbpass, $fdbname) or die  ('Error connecting to mysqli');
$query  = "UPDATE scenes set UserID = '11111111' WHERE ID = '031DFDAD92F6F4AB64AF317C06D64089DF119EC2';";
$query .= "INSERT INTO surfaces (ID, Name, SceneID, SurfaceTypeID, Color) VALUES('5F9A7301C2D398C4D1B90BA5AA56A9DED3FAA639', 'front ', '031DFDAD92F6F4AB64AF317C06D64089DF119EC2', 1, 11432044);";
$query .= "INSERT INTO surfaces (ID, Name, SceneID, SurfaceTypeID, Color) VALUES('1FCA2131ED1B89206E4E66DBE20D8D09513FF39D', 'floor ', '031DFDAD92F6F4AB64AF317C06D64089DF119EC2', 1, 7318465);";
$query .= "INSERT INTO surfaces (ID, Name, SceneID, SurfaceTypeID, Color) VALUES('1FCA2131ED1B89206E4E66DBE20D8D09513FF39D', 'floor ', '031DFDAD92F6F4AB64AF317C06D64089DF119EC2', 1, 7318465);";
$query .= "INSERT INTO regions (ID, SurfaceID, x, y, width, height, RegionMovieClip) VALUES('DBD0E85EAEE2685E2AEC590C8CA214C3C5653971', '1FCA2131ED1B89206E4E66DBE20D8D09513FF39D', 272, 288, 114, 89, 'asdasd')";
if ($fconn->multi_query($query)) {

         if ($result = $fconn->store_result()) {
            //while ($row = $result->fetch_row()) {
                //print_r($row);
            }
            //$result->free();
            }
         if ($fconn->more_results()) {

            while ($fconn->next_result()){ 
            $thisresult = $fconn->store_result();

            print_r($thisresult).'<br />';
            }
            }

}
unset($query);
$fconn->close();