PHP: mysqli::query - Manual (original) (raw)

mysqli_query

(PHP 5, PHP 7, PHP 8)

mysqli::query -- mysqli_query — Performs a query on the database

Description

Object-oriented style

For non-DML queries (not INSERT, UPDATE or DELETE), this function is similar to calling mysqli_real_query() followed by eithermysqli_use_result() or mysqli_store_result().

Note:

In the case where a statement is passed tomysqli_query() that is longer thanmax_allowed_packet of the server, the returned error codes are different depending on whether you are using MySQL Native Driver (mysqlnd) or MySQL Client Library (libmysqlclient). The behavior is as follows:

Parameters

mysql

Procedural style only: A mysqli object returned by mysqli_connect() or mysqli_init()

query

The query string.

result_mode

The result mode can be one of 3 constants indicating how the result will be returned from the MySQL server.

[MYSQLI_STORE_RESULT](mysqli.constants.php#constant.mysqli-store-result) (default) - returns amysqli_result object with buffered result set.

[MYSQLI_USE_RESULT](mysqli.constants.php#constant.mysqli-use-result) - returns amysqli_result object with unbuffered result set. As long as there are pending records waiting to be fetched, the connection line will be busy and all subsequent calls will return error Commands out of sync. To avoid the error all records must be fetched from the server or the result set must be discarded by calling mysqli_free_result().

[MYSQLI_ASYNC](mysqli.constants.php#constant.mysqli-async) (available with mysqlnd) - the query is performed asynchronously and no result set is immediately returned.mysqli_poll() is then used to get results from such queries. Used in combination with either**[MYSQLI_STORE_RESULT](mysqli.constants.php#constant.mysqli-store-result)** or**[MYSQLI_USE_RESULT](mysqli.constants.php#constant.mysqli-use-result)** constant.

Return Values

Returns [false](reserved.constants.php#constant.false) on failure. For successful queries which produce a result set, such as SELECT, SHOW, DESCRIBE orEXPLAIN, mysqli_query() will return a mysqli_result object. For other successful queries,mysqli_query() will return [true](reserved.constants.php#constant.true).

Examples

Example #1 mysqli::query() example

Object-oriented style

`<?php

mysqli_report

(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");/* Create table doesn't return a resultset /
$mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City");
printf("Table myCity successfully created.\n");/ Select queries return a resultset / result=result = result=mysqli->query("SELECT Name FROM City LIMIT 10");
printf("Select returned %d rows.\n", $result->num_rows);/ If we have to retrieve large amount of data we use MYSQLI_USE_RESULT / result=result = result=mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT);/ Note, that we can't execute any functions which interact with the
server until all records have been fully retrieved or the result
set was closed. All calls will return an 'out of sync' error */
$mysqli->query("SET @a:='this will not work'");`

Procedural style

`<?php

mysqli_report

(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);
$link = mysqli_connect("localhost", "my_user", "my_password", "world");/* Create table doesn't return a resultset /
mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City");
printf("Table myCity successfully created.\n");/ Select queries return a resultset / result=mysqliquery(result = mysqli_query(result=mysqliq​uery(link, "SELECT Name FROM City LIMIT 10");
printf("Select returned %d rows.\n", mysqli_num_rows($result));/ If we have to retrieve large amount of data we use MYSQLI_USE_RESULT / result=mysqliquery(result = mysqli_query(result=mysqliq​uery(link, "SELECT * FROM City", MYSQLI_USE_RESULT);/ Note, that we can't execute any functions which interact with the
server until all records have been fully retrieved or the result
set was closed. All calls will return an 'out of sync' error */
mysqli_query($link, "SET @a:='this will not work'");`

The above examples will output something similar to:

Table myCity successfully created. Select returned 10 rows.

Fatal error: Uncaught mysqli_sql_exception: Commands out of sync; you can't run this command now in...

See Also

Found A Problem?

NUNTIUS

17 years ago

This may or may not be obvious to people but perhaps it will help someone.

When running joins in SQL you may encounter a problem if you are trying to pull two columns with the same name. mysqli returns the last in the query when called by name. So to get what you need you can use an alias.

Below I am trying to join a user id with a user role. in the first table (tbl_usr), role is a number and in the second is a  text name (tbl_memrole is a lookup table). If I call them both as role I get the text as it is the last "role" in the query. If I use an alias then I get both as desired as shown below.

<?php
$sql = "SELECT a.uid, a.role AS roleid, b.role, 
            FROM tbl_usr a
            INNER JOIN tbl_memrole b
            ON a.role = b.id
            ";

    if ($result = <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>m</mi><mi>y</mi><mi>s</mi><mi>q</mi><mi>l</mi><mi>i</mi><mo>−</mo><mo>&gt;</mo><mi>q</mi><mi>u</mi><mi>e</mi><mi>r</mi><mi>y</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">mysqli-&gt;query(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">ys</span><span class="mord mathnormal" style="margin-right:0.01968em;">ql</span><span class="mord mathnormal">i</span><span class="mord">−</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&gt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">q</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.03588em;">ery</span><span class="mopen">(</span></span></span></span>sql)) {
        while($obj = $result->fetch_object()){
            <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>l</mi><mi>i</mi><mi>n</mi><mi>e</mi><mi mathvariant="normal">.</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">line.=</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">in</span><span class="mord mathnormal">e</span><span class="mord">.</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>obj->uid;
            <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>l</mi><mi>i</mi><mi>n</mi><mi>e</mi><mi mathvariant="normal">.</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">line.=</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">in</span><span class="mord mathnormal">e</span><span class="mord">.</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>obj->role;
            <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>l</mi><mi>i</mi><mi>n</mi><mi>e</mi><mi mathvariant="normal">.</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">line.=</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">in</span><span class="mord mathnormal">e</span><span class="mord">.</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>obj->roleid;
        }
    }
    $result->close();
    unset($obj);
    unset($sql);
    unset($query);
    
?>
In this situation I guess I could have just renamed the role column in the first table roleid and that would have taken care of it, but it was a learning experience.

theyranos at gmail dot com

14 years ago

The cryptic "Couldn't fetch mysqli" error message can mean any number of things, including:

1. You're trying to use a database object that you've already closed (as noted by ceo at l-i-e dot com). Reopen your database connection, or find the call to <?php mysqli_close($db); ?> or <?php $db->close(); ?> and remove it.
2. Your MySQLi object has been serialized and unserialized for some reason. Define a wakeup function to re-create your database connection. http://php.net/__wakeup 
3. Something besides you closed your mysqli connection (in particular, see http://bugs.php.net/bug.php?id=33772)
4. You mixed OOP and functional calls to the database object. (So, you have <?php <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>d</mi><mi>b</mi><mo>−</mo><mo>&gt;</mo><mi>q</mi><mi>u</mi><mi>e</mi><mi>r</mi><mi>y</mi><mo stretchy="false">(</mo><mo stretchy="false">)</mo><mo stretchy="false">?</mo><mo>&gt;</mo><mi>i</mi><mi>n</mi><mi>t</mi><mi>h</mi><mi>e</mi><mi>s</mi><mi>a</mi><mi>m</mi><mi>e</mi><mi>p</mi><mi>r</mi><mi>o</mi><mi>g</mi><mi>r</mi><mi>a</mi><mi>m</mi><mi>a</mi><mi>s</mi><mo>&lt;</mo><mo stretchy="false">?</mo><mi>p</mi><mi>h</mi><mi>p</mi><mi>m</mi><mi>y</mi><mi>s</mi><mi>q</mi><mi>l</mi><msub><mi>i</mi><mi>q</mi></msub><mi>u</mi><mi>e</mi><mi>r</mi><mi>y</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">db-&gt;query() ?&gt; in the same program as &lt;?php mysqli_query(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.7778em;vertical-align:-0.0833em;"></span><span class="mord mathnormal">d</span><span class="mord mathnormal">b</span><span class="mord">−</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&gt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">q</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.03588em;">ery</span><span class="mopen">(</span><span class="mclose">)?</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&gt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">in</span><span class="mord mathnormal">t</span><span class="mord mathnormal">h</span><span class="mord mathnormal">es</span><span class="mord mathnormal">am</span><span class="mord mathnormal">e</span><span class="mord mathnormal">p</span><span class="mord mathnormal">ro</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">ama</span><span class="mord mathnormal">s</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&lt;</span></span><span class="base"><span class="strut" style="height:1.0361em;vertical-align:-0.2861em;"></span><span class="mclose">?</span><span class="mord mathnormal">p</span><span class="mord mathnormal">h</span><span class="mord mathnormal">p</span><span class="mord mathnormal">m</span><span class="mord mathnormal">ys</span><span class="mord mathnormal" style="margin-right:0.01968em;">ql</span><span class="mord"><span class="mord mathnormal">i</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight" style="margin-right:0.03588em;">q</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.2861em;"><span></span></span></span></span></span></span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.03588em;">ery</span><span class="mopen">(</span></span></span></span>db) ?>).

petrus.jvr

14 years ago

When calling multiple stored procedures, you can run into the following error: "Commands out of sync; you can't run this command now".
This can happen even when using the close() function on the result object between calls. 
To fix the problem, remember to call the next_result() function on the mysqli object after each stored procedure call. See example below:

<?php
// New Connection
$db = new mysqli('localhost','user','pass','database');

// Check for errors
if(mysqli_connect_errno()){
 echo mysqli_connect_error();
}

// 1st Query <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>s</mi><mi>u</mi><mi>l</mi><mi>t</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">result = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">res</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>db->query("call getUsers()");
if($result){
     // Cycle through results
    while ($row = $result->fetch_object()){
        <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>u</mi><mi>s</mi><mi>e</mi><msub><mi>r</mi><mi>a</mi></msub><mi>r</mi><mi>r</mi><mo stretchy="false">[</mo><mo stretchy="false">]</mo><mo>=</mo></mrow><annotation encoding="application/x-tex">user_arr[] = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">u</span><span class="mord mathnormal">se</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">rr</span><span class="mopen">[</span><span class="mclose">]</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>row;
    }
    // Free result set
    $result->close();
    $db->next_result();
}

// 2nd Query <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>r</mi><mi>e</mi><mi>s</mi><mi>u</mi><mi>l</mi><mi>t</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">result = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.6944em;"></span><span class="mord mathnormal">res</span><span class="mord mathnormal">u</span><span class="mord mathnormal">lt</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>db->query("call getGroups()");
if($result){
     // Cycle through results
    while ($row = $result->fetch_object()){
        <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>g</mi><mi>r</mi><mi>o</mi><mi>u</mi><msub><mi>p</mi><mi>a</mi></msub><mi>r</mi><mi>r</mi><mo stretchy="false">[</mo><mo stretchy="false">]</mo><mo>=</mo></mrow><annotation encoding="application/x-tex">group_arr[] = </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord mathnormal">ro</span><span class="mord mathnormal">u</span><span class="mord"><span class="mord mathnormal">p</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">a</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">rr</span><span class="mopen">[</span><span class="mclose">]</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>row;
    }
     // Free result set
     $result->close();
     $db->next_result();
}
else echo($db->error);

// Close connection
$db->close();
?>

xa at sagexa dot com

3 years ago

"In PHP 8.1, the default error handling behavior of the MySQLi extension has changed from silencing errors to throw an Exception on errors. "
This is true even for the procedural use of mysqli, i.e. mysqli_query.
Hence, using if(!mysqli_query($c, $sql)) [...] is pointless.
To disable Exception throwing : mysqli_report(MYSQLI_REPORT_OFF);

Anonymous

7 years ago

Here is an example of a clean query into a html table

<table>
   <tr>
     <th>First Name</th>
     <th>Last Name</th>
     <th>City</th>
   </tr>
   <?php while ($row = $myquery->fetch_assoc()) { ?>
   <tr>
     <td><?php echo $row["firstname"]; ?></td>
     <td><?php echo $row["lastname"]; ?></td>
     <td><?php echo $row["city"];?></td>
   </tr>
   <?php } ?>
 </table>

registrations at jdfoxmicro dot com

15 years ago

I like to save the query itself in a log file, so that I don't have to worry about whether the site is live.

For example, I might have a global function:

<?php
function UpdateLog ( <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>s</mi><mi>t</mi><mi>r</mi><mi>i</mi><mi>n</mi><mi>g</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">string , </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.854em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">s</span><span class="mord mathnormal">t</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">in</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mpunct">,</span></span></span></span>logfile )  {
   <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mi>h</mi><mo>=</mo><mi>f</mi><mi>o</mi><mi>p</mi><mi>e</mi><mi>n</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">fh = fopen ( </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">h</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal">o</span><span class="mord mathnormal">p</span><span class="mord mathnormal">e</span><span class="mord mathnormal">n</span><span class="mopen">(</span></span></span></span>logfile , 'a' );
   <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>f</mi><mi>w</mi><mi>r</mi><mi>i</mi><mi>t</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">fwrite ( </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.10764em;">f</span><span class="mord mathnormal" style="margin-right:0.02691em;">w</span><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="mord mathnormal">i</span><span class="mord mathnormal">t</span><span class="mord mathnormal">e</span><span class="mopen">(</span></span></span></span>fh , strftime ('%F %T %z')." ".$string."\n";
   fclose ( $fh );
}
?>

Then in my mysql function error trapper, something like this:

<?php
   $error_msg = "Database error in [page].php / ";
   <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>e</mi><mi>r</mi><mi>r</mi><mi>o</mi><msub><mi>r</mi><mi>m</mi></msub><mi>s</mi><mi>g</mi><mi mathvariant="normal">.</mi><mo>=</mo><mi>m</mi><mi>y</mi><mi>s</mi><mi>q</mi><mi>l</mi><msub><mi>i</mi><mi>e</mi></msub><mi>r</mi><mi>r</mi><mi>o</mi><mi>r</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">error_msg .= mysqli_error ( </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">erro</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">m</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">s</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord">.</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">ys</span><span class="mord mathnormal" style="margin-right:0.01968em;">ql</span><span class="mord"><span class="mord mathnormal">i</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:0em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">e</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal" style="margin-right:0.02778em;">rror</span><span class="mopen">(</span></span></span></span>link )." / ";
   <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>e</mi><mi>r</mi><mi>r</mi><mi>o</mi><msub><mi>r</mi><mi>m</mi></msub><mi>s</mi><mi>g</mi><mi mathvariant="normal">.</mi><mo>=</mo></mrow><annotation encoding="application/x-tex">error_msg .= </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">erro</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.02778em;">r</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0278em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">m</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.15em;"><span></span></span></span></span></span></span><span class="mord mathnormal">s</span><span class="mord mathnormal" style="margin-right:0.03588em;">g</span><span class="mord">.</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>query;
   UpdateLog ( $error_msg , DB_ERROR_LOG_FILE );
?>

I also include the remote IP, user agent, etc., but I left it out of these code samples.  And have it e-mail me when an error is caught, too.

Jeff

ceo at l-i-e dot com

17 years ago

Translation:
"Couldn't fetch mysqli"

You closed your connection and are trying to use it again.

It has taken me DAYS to figure out what this obscure error message means...

Beeners

19 years ago

Stored Procedures.

Use mysqli_query to call a stored procedure that returns a result set. 

Here is a short example:

<?php
$mysqli = new mysqli(DBURI,DBUSER,DBPASS,DBNAME);
if (mysqli_connect_errno()) 
{
  printf("Connection failed: %s\n", mysqli_connect_error());
  exit();
}
 <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>S</mi><mi>Q</mi><mi>L</mi><mo>=</mo><mi mathvariant="normal">&quot;</mi><mi>C</mi><mi>A</mi><mi>L</mi><mi>L</mi><mi>m</mi><msub><mi>y</mi><mi>p</mi></msub><mi>r</mi><mi>o</mi><mi>c</mi><mi>e</mi><mi>d</mi><mi>u</mi><mi>r</mi><mi>e</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">SQL = &quot;CALL my_procedure(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8778em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">SQ</span><span class="mord mathnormal">L</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1.0361em;vertical-align:-0.2861em;"></span><span class="mord">&quot;</span><span class="mord mathnormal" style="margin-right:0.07153em;">C</span><span class="mord mathnormal">A</span><span class="mord mathnormal">LL</span><span class="mord mathnormal">m</span><span class="mord"><span class="mord mathnormal" style="margin-right:0.03588em;">y</span><span class="msupsub"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.1514em;"><span style="top:-2.55em;margin-left:-0.0359em;margin-right:0.05em;"><span class="pstrut" style="height:2.7em;"></span><span class="sizing reset-size6 size3 mtight"><span class="mord mathnormal mtight">p</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.2861em;"><span></span></span></span></span></span></span><span class="mord mathnormal">roce</span><span class="mord mathnormal">d</span><span class="mord mathnormal">u</span><span class="mord mathnormal">re</span><span class="mopen">(</span></span></span></span>something)";
if ( ($result = <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>m</mi><mi>y</mi><mi>s</mi><mi>q</mi><mi>l</mi><mi>i</mi><mo>−</mo><mo>&gt;</mo><mi>q</mi><mi>u</mi><mi>e</mi><mi>r</mi><mi>y</mi><mo stretchy="false">(</mo></mrow><annotation encoding="application/x-tex">mysqli-&gt;query(</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">ys</span><span class="mord mathnormal" style="margin-right:0.01968em;">ql</span><span class="mord mathnormal">i</span><span class="mord">−</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&gt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal" style="margin-right:0.03588em;">q</span><span class="mord mathnormal">u</span><span class="mord mathnormal" style="margin-right:0.03588em;">ery</span><span class="mopen">(</span></span></span></span>SQL))===false )
{
  printf("Invalid query: %s\nWhole query: %s\n", <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>m</mi><mi>y</mi><mi>s</mi><mi>q</mi><mi>l</mi><mi>i</mi><mo>−</mo><mo>&gt;</mo><mi>e</mi><mi>r</mi><mi>r</mi><mi>o</mi><mi>r</mi><mo separator="true">,</mo></mrow><annotation encoding="application/x-tex">mysqli-&gt;error, </annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:0.8889em;vertical-align:-0.1944em;"></span><span class="mord mathnormal">m</span><span class="mord mathnormal">ys</span><span class="mord mathnormal" style="margin-right:0.01968em;">ql</span><span class="mord mathnormal">i</span><span class="mord">−</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">&gt;</span><span class="mspace" style="margin-right:0.2778em;"></span></span><span class="base"><span class="strut" style="height:0.625em;vertical-align:-0.1944em;"></span><span class="mord mathnormal" style="margin-right:0.02778em;">error</span><span class="mpunct">,</span></span></span></span>SQL);
  exit();
}

while ($myrow = $result->fetch_array(MYSQLI_ASSOC))
{
  <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>a</mi><mi>V</mi><mi>a</mi><mi>l</mi><mi>u</mi><mi>e</mi><mo stretchy="false">[</mo><mo stretchy="false">]</mo><mo>=</mo></mrow><annotation encoding="application/x-tex">aValue[]=</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">aVa</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">u</span><span class="mord mathnormal">e</span><span class="mopen">[</span><span class="mclose">]</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>myrow["a"];
  <span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><mi>b</mi><mi>V</mi><mi>a</mi><mi>l</mi><mi>u</mi><mi>e</mi><mo stretchy="false">[</mo><mo stretchy="false">]</mo><mo>=</mo></mrow><annotation encoding="application/x-tex">bValue[]=</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1em;vertical-align:-0.25em;"></span><span class="mord mathnormal">bVa</span><span class="mord mathnormal" style="margin-right:0.01968em;">l</span><span class="mord mathnormal">u</span><span class="mord mathnormal">e</span><span class="mopen">[</span><span class="mclose">]</span><span class="mspace" style="margin-right:0.2778em;"></span><span class="mrel">=</span></span></span></span>myrow["b"];
}
$result->close();
$mysqli->close();
?>
I hope this saves someone some time.