Performs a query on the database

mysqli::prepare
mysqli::real_connect
mysqli
PHP Manual

# mysqli::query

# mysqli_query

(PHP 5)

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

### Description

Object oriented style

mixed mysqli::query ( string `$query` [, int `$resultmode` = MYSQLI_STORE_RESULT ] )

Procedural style

mixed mysqli_query ( mysqli `$link` , string `$query` [, int `$resultmode` = MYSQLI_STORE_RESULT ] )

Performs a `query` against the database.

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

> Note:

> In the case where you pass a statement to mysqli_query() that is longer than max_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:

> - mysqlnd on Linux returns an error code of 1153. The error message means "got a packet bigger than max_allowed_packet bytes".

> - mysqlnd on Windows returns an error code 2006. This error message means "server has gone away".

> - libmysqlclient on all platforms returns an error code 2006. This error message means "server has gone away".

### Parameters

`link`

  Procedural style only: A link identifier returned by mysqli_connect() or mysqli_init()

`query`

  The query string.

  Data inside the query should be properly escaped.

`resultmode`

  Either the constant `MYSQLI_USE_RESULT` or `MYSQLI_STORE_RESULT` depending on the desired behavior. By default, `MYSQLI_STORE_RESULT` is used.

  If you use `MYSQLI_USE_RESULT` all subsequent calls will return error Commands out of sync unless you call mysqli_free_result()

  With `MYSQLI_ASYNC` (available with mysqlnd), it is possible to perform query asynchronously. mysqli_poll() is then used to get results from such queries.

### Return Values

Returns `FALSE` on failure. For successful SELECT, SHOW, DESCRIBE or EXPLAIN queries mysqli_query() will return a mysqli_result object. For other successful queries mysqli_query() will return `TRUE`.

### Changelog

Version | Description
--- | ---
5.3.0 | Added the ability of async queries.

### Examples

Example #1 mysqli::query() example

Object oriented style

`<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if ($mysqli->connect_errno) {
printf("Connect failed: %s\n", $mysqli->connect_error);
exit();
}
/* Create table doesn't return a resultset */
if ($mysqli->query("CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = $mysqli->query("SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", $result->num_rows);
/* free result set */
$result->close();
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = $mysqli->query("SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!$mysqli->query("SET @a:='this will not work'")) {
printf("Error: %s\n", $mysqli->error);
}
$result->close();
}
$mysqli->close();
?>`

Procedural style

`<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* Create table doesn't return a resultset */
if (mysqli_query($link, "CREATE TEMPORARY TABLE myCity LIKE City") === TRUE) {
printf("Table myCity successfully created.\n");
}
/* Select queries return a resultset */
if ($result = mysqli_query($link, "SELECT Name FROM City LIMIT 10")) {
printf("Select returned %d rows.\n", mysqli_num_rows($result));
/* free result set */
mysqli_free_result($result);
}
/* If we have to retrieve large amount of data we use MYSQLI_USE_RESULT */
if ($result = mysqli_query($link, "SELECT * FROM City", MYSQLI_USE_RESULT)) {
/* Note, that we can't execute any functions which interact with the
server until result set was closed. All calls will return an
'out of sync' error */
if (!mysqli_query($link, "SET @a:='this will not work'")) {
printf("Error: %s\n", mysqli_error($link));
}
mysqli_free_result($result);
}
mysqli_close($link);
?>`

The above examples will output:

    Table myCity successfully created.
    Select returned 10 rows.
    Error: Commands out of sync;  You can't run this command now

### See Also

- mysqli_real_query() - Execute an SQL query
- mysqli_multi_query() - Performs a query on the database
- mysqli_free_result() - Frees the memory associated with a result

mysqli::prepare
mysqli::real_connect
mysqli
PHP Manual