PHP 4, PHP 5
mysql_query - Send a MySQL query
Code Examples

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.



An SQL query

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


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

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