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PHP : Function Reference : MySQL Improved Extension : mysqli_multi_query

mysqli_multi_query

Performs a query on the database (PHP 5)
bool mysqli_multi_query ( mysqli link, string query )

Example 1527. Object oriented style

<?php
$mysqli
= new mysqli("localhost", "my_user", "my_password", "world");

/* check connection */
if (mysqli_connect_errno()) {
   
printf("Connect failed: %s\n", mysqli_connect_error());
   exit();
}

$query  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
if ($mysqli->multi_query($query)) {
   do {
       
/* store first result set */
       
if ($result = $mysqli->store_result()) {
           while (
$row = $result->fetch_row()) {
               
printf("%s\n", $row[0]);
           }
           
$result->close();
       }
       
/* print divider */
       
if ($mysqli->more_results()) {
           
printf("-----------------\n");
       }
   } while (
$mysqli->next_result());
}

/* close connection */
$mysqli->close();
?>

Example 1528. Procedural style

<?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  = "SELECT CURRENT_USER();";
$query .= "SELECT Name FROM City ORDER BY ID LIMIT 20, 5";

/* execute multi query */
if (mysqli_multi_query($link, $query)) {
   do {
       
/* store first result set */
       
if ($result = mysqli_store_result($link)) {
           while (
$row = mysqli_fetch_row($result)) {
               
printf("%s\n", $row[0]);
           }
           
mysqli_free_result($result);
       }
       
/* print divider */
       
if (mysqli_more_results($link)) {
           
printf("-----------------\n");
       }
   } while (
mysqli_next_result($link));
}

/* close connection */
mysqli_close($link);
?>

Code Examples / Notes » mysqli_multi_query

info

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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mysqli_affected_rows
mysqli_autocommit
mysqli_bind_param
mysqli_bind_result
mysqli_change_user
mysqli_character_set_name
mysqli_client_encoding
mysqli_close
mysqli_commit
mysqli_connect_errno
mysqli_connect_error
mysqli_connect
mysqli_data_seek
mysqli_debug
mysqli_disable_reads_from_master
mysqli_disable_rpl_parse
mysqli_dump_debug_info
mysqli_embedded_server_end
mysqli_embedded_server_start
mysqli_enable_reads_from_master
mysqli_enable_rpl_parse
mysqli_errno
mysqli_error
mysqli_escape_string
mysqli_execute
mysqli_fetch_array
mysqli_fetch_assoc
mysqli_fetch_field_direct
mysqli_fetch_field
mysqli_fetch_fields
mysqli_fetch_lengths
mysqli_fetch_object
mysqli_fetch_row
mysqli_fetch
mysqli_field_count
mysqli_field_seek
mysqli_field_tell
mysqli_free_result
mysqli_get_charset
mysqli_get_client_info
mysqli_get_client_version
mysqli_get_host_info
mysqli_get_metadata
mysqli_get_proto_info
mysqli_get_server_info
mysqli_get_server_version
mysqli_get_warnings
mysqli_info
mysqli_init
mysqli_insert_id
mysqli_kill
mysqli_master_query
mysqli_more_results
mysqli_multi_query
mysqli_next_result
mysqli_num_fields
mysqli_num_rows
mysqli_options
mysqli_param_count
mysqli_ping
mysqli_prepare
mysqli_query
mysqli_real_connect
mysqli_real_escape_string
mysqli_real_query
mysqli_report
mysqli_rollback
mysqli_rpl_parse_enabled
mysqli_rpl_probe
mysqli_rpl_query_type
mysqli_select_db
mysqli_send_long_data
mysqli_send_query
mysqli_server_end
mysqli_server_init
mysqli_set_charset
mysqli_set_local_infile_default
mysqli_set_local_infile_handler
mysqli_set_opt
mysqli_slave_query
mysqli_sqlstate
mysqli_ssl_set
mysqli_stat
mysqli_stmt_affected_rows
mysqli_stmt_attr_get
mysqli_stmt_attr_set
mysqli_stmt_bind_param
mysqli_stmt_bind_result
mysqli_stmt_close
mysqli_stmt_data_seek
mysqli_stmt_errno
mysqli_stmt_error
mysqli_stmt_execute
mysqli_stmt_fetch
mysqli_stmt_field_count
mysqli_stmt_free_result
mysqli_stmt_get_warnings
mysqli_stmt_init
mysqli_stmt_insert_id
mysqli_stmt_num_rows
mysqli_stmt_param_count
mysqli_stmt_prepare
mysqli_stmt_reset
mysqli_stmt_result_metadata
mysqli_stmt_send_long_data
mysqli_stmt_sqlstate
mysqli_stmt_store_result
mysqli_store_result
mysqli_thread_id
mysqli_thread_safe
mysqli_use_result
mysqli_warning_count
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