mysql_query

PHP 4, PHP 5

mysql_query - Send a MySQL query

Manual

mysql_query( string$query, [resource$link_identifier = NULL] ): mixed

mysql_query sends a unique query (multiple queries are not supported) to the currently active database on the server that's associated with the specified link_identifier.

Parameters

query

An SQL query

The query string should not end with a semicolon. Data inside the query should be properly escaped.

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 had been called with no arguments. If no connection is found or established, an E_WARNING level error is generated.

Return Values

For SELECT, SHOW, DESCRIBE, EXPLAIN and other statements returning resultset, mysql_query returns a resource on success, or false on error.

For other type of SQL statements, INSERT, UPDATE, DELETE, DROP, etc, mysql_query returns true on success or false on error.

The returned result resource should be passed to mysql_fetch_array, and other functions for dealing with result tables, to access the returned data.

Use mysql_num_rows to find out how many rows were returned for a SELECT statement or mysql_affected_rows to find out how many rows were affected by a DELETE, INSERT, REPLACE, or UPDATE statement.

mysql_query will also fail and return false if the user does not have permission to access the table(s) referenced by the query.

Related Functions

Example of mysql_query

Show all examples for mysql_query

<?php
// This could be supplied by a user, for example
$firstname = 'fred';
$lastname  = 'fox';
// Formulate Query
// This is the best way to perform an SQL query
// For more examples, see mysql_real_escape_string()
$query = sprintf("SELECT firstname, lastname, address, age FROM friends 
    WHERE firstname='%s' AND lastname='%s'",
    mysql_real_escape_string($firstname),
    mysql_real_escape_string($lastname));
// Perform Query
$result = mysql_query($query);
// Check result
// This shows the actual query sent to MySQL, and the error. Useful for debugging.
if (!$result) {
    $message  = 'Invalid query: ' . mysql_error() . "\n";
    $message .= 'Whole query: ' . $query;
    die($message);
}
// Use result
// Attempting to print $result won't allow access to information in the resource
// One of the mysql result functions must be used
// See also mysql_result(), mysql_fetch_array(), mysql_fetch_row(), etc.
while ($row = mysql_fetch_assoc($result)) {
    echo $row['firstname'];
    echo $row['lastname'];
    echo $row['address'];
    echo $row['age'];
}
// Free the resources associated with the result set
// This is done automatically at the end of the script
mysql_free_result($result);

Edit/Test in Sandbox

PHP Version:

mysql_query

Parameters

Return Values

Related Functions

Example of mysql_query

Function mysql_query:

Original MySQL API Functions

Most used PHP functions