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MySQL Functions
PHP Manual

# mysql_db_query

(PHP 4, PHP 5, PECL mysql:1.0)

mysql_db_query — Send a MySQL query

### Description

resource mysql_db_query ( string `$database` , string `$query` [, resource `$link_identifier` ] )

mysql_db_query() selects a database, and executes a query on it.

### Parameters

`database`

  The name of the database that will be selected.

`query`

  The MySQL query.

`link_identifier`

  The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect() is assumed. If no such link is found, it will try to create one as if mysql_connect() was called with no arguments. If by chance no connection is found or established, an `E_WARNING` level error is generated.

### Return Values

Returns a positive MySQL result resource to the query result, or `FALSE` on error. The function also returns `TRUE`/`FALSE` for INSERT/UPDATE/DELETE queries to indicate success/failure.

### ChangeLog

Version | Description
--- | ---
4.0.6 | This function is deprecated, do not use this function. Use mysql_select_db() and mysql_query() instead.

### Examples

Example #1 mysql_db_query() alternative example

`<?php
if (!$link = mysql_connect('mysql_host', 'mysql_user', 'mysql_password')) {
echo 'Could not connect to mysql';
exit;
}
if (!mysql_select_db('mysql_dbname', $link)) {
echo 'Could not select database';
exit;
}
$sql = 'SELECT foo FROM bar WHERE id = 42';
$result = mysql_query($sql, $link);
if (!$result) {
echo "DB Error, could not query the database\n";
echo 'MySQL Error: ' . mysql_error();
exit;
}
while ($row = mysql_fetch_assoc($result)) {
echo $row['foo'];
}
mysql_free_result($result);
?>`

### Notes

> Note: Be aware that this function does NOT switch back to the database you were connected before. In other words, you can't use this function to temporarily run a sql query on another database, you would have to manually switch back. Users are strongly encouraged to use the database.table syntax in their sql queries or mysql_select_db() instead of this function.

### See Also

- mysql_query()
- mysql_select_db()

mysql_db_name
mysql_drop_db
MySQL Functions
PHP Manual