(PHP 4 >= 4.0.6, PHP 5)
mysql_unbuffered_query -- Send an SQL query to MySQL, without fetching and buffering the result rows
mysql_unbuffered_query() sends a SQL query
query to MySQL, without fetching and
buffering the result rows automatically, as
mysql_query() does. On the one hand, this
saves a considerable amount of memory with SQL queries that
produce large result sets. On the other hand, you can start
working on the result set immediately after the first row has
been retrieved: you don't have to wait until the complete SQL
query has been performed. When using multiple DB-connects, you
have to specify the optional parameter
link_identifier.
queryA SQL query
link_identifierThe 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 warning is generated.
For SELECT, SHOW, DESCRIBE or EXPLAIN statements, mysql_unbuffered_query() returns a resource on success, or FALSE on error.
For other type of SQL statements, UPDATE, DELETE, DROP, etc, mysql_unbuffered_query() returns TRUE on success or FALSE on error.
Note: The benefits of mysql_unbuffered_query() come at a cost: You cannot use mysql_num_rows() and mysql_data_seek() on a result set returned from mysql_unbuffered_query(). You also have to fetch all result rows from an unbuffered SQL query, before you can send a new SQL query to MySQL.