(PHP 4, PHP 5)
mysql_query — Send a MySQL query
This extension was deprecated in PHP 5.5.0, and it was removed in PHP 7.0.0. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide. Alternatives to this function include:
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
.
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.
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.
Example #1 Invalid Query
The following query is syntactically invalid, so
mysql_query() fails and returns false
.
<?php$result = mysql_query('SELECT * WHERE 1=1');if (!$result) { die('Invalid query: ' . mysql_error());}?>
Example #2 Valid Query
The following query is valid, so mysql_query() returns a resource.
<?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 $row['age'];}// Free the resources associated with the result set// This is done automatically at the end of the scriptmysql_free_result($result);?>