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Digg  mysqli_multi_query
Performs a query on the database
(PHP 5)
Example 1527. Object oriented style<?phpExample 1528. Procedural style<?phpCode Examples / Notes » mysqli_multi_queryinfo
Note that you need to use this function to call Stored Procedures! If you experience "lost connection to MySQL server" errors with your Stored Procedure calls then you did not fetch the 'OK' (or 'ERR') message, which is a second result-set from a Stored Procedure call. You have to fetch that result to have no problems with subsequent queries. Bad example, will FAIL now and then on subsequent calls: <?php $sQuery='CALL exampleSP('param')'; if(!mysqli_multi_query($this->sqlLink,$sQuery)) $this->queryError(); $this->sqlResult=mysqli_store_result($this->sqlLink); ?> Working example: <?php $sQuery='CALL exampleSP('param')'; if(!mysqli_multi_query($this->sqlLink,$sQuery)) $this->queryError(); $this->sqlResult=mysqli_store_result($this->sqlLink); if(mysqli_more_results($this->sqlLink)) while(mysqli_next_result($this->sqlLink)); ?> Of course you can do more with the multiple results then just throwing them away, but for most this will suffice. You could for example make an "sp" function which will kill the 2nd 'ok' result. This nasty 'OK'-message made me spend hours trying to figure out why MySQL server was logging warnings with 'bad packets from client' and PHP mysql_error() with 'Connection lost'. It's a shame the mysqli library does catch this by just doing it for you. sly underscore mcfly
Ive just had exactly the same problem as below trying to execute multiple stored procedures. I thought i might as well add how to do it the object oriented way. Instead of putting the one statement: $mysqli->next_result(); Put two: $mysqli->next_result(); $mysqli->next_result(); The first statement points (possibly using the term incorrectly) you to the return value. The second one will point you to the result of the next query. I hope this makes sense. mjmendoza
I was developing my own CMS and I was having problem with attaching the database' sql file. I thought mysqli_multi_query got bugs where it crashes my MySQL server. I tried to report the bug but it showed that it has duplicate bug reports of other developers. To my surprise, mysqli_multi_query needs to bother with result even if there's none. I finally got it working when I copied the sample and removed somethings. Here is what it looked liked <?php $link = mysqli_connect("localhost", "my_user", "my_password", "world"); /* check connection */ if (mysqli_connect_errno()) { printf("Connect failed: %s\n", mysqli_connect_error()); exit(); } $query = "CREATE TABLE....;...;... blah blah blah;..."; /* execute multi query */ if (mysqli_multi_query($link, $query)) { do { /* store first result set */ if ($result = mysqli_store_result($link)) { //do nothing since there's nothing to handle mysqli_free_result($result); } /* print divider */ if (mysqli_more_results($link)) { //I just kept this since it seems useful //try removing and see for yourself } } while (mysqli_next_result($link)); } /* close connection */ mysqli_close($link); ?> bottom-line: I think mysql_multi_query should only be used for attaching a database. it's hard to handle results from 'SELECT' statements inside a single while loop. |
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