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mysql_db_query

PHP function Edit on GitHub ✎

(PHP 4, PHP 5)

Selects a database and executes a query on it

5-3-0 mysqli_select_db then the queryPDO::__construct

Description

mysql_db_query(string $database, string $query, resource $link_identifier = NULL): resource|bool

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.

Data inside the query should be properly escaped.

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.

Examples

mysql_db_query() alternative example

php

<?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.