(PHP 4 >= 4.0.6, PHP 5)
mysql_unbuffered_query — Send an SQL query to MySQL without fetching and buffering the result rows.
$query
[, resource $link_identifier = NULL
] )
mysql_unbuffered_query() sends the SQL query
query to MySQL without automatically
fetching and buffering the result rows as
mysql_query() does. This saves a considerable
amount of memory with SQL queries that produce large result sets,
and you can start working on the result set immediately after the
first row has been retrieved as you don't have to wait until the
complete SQL query has been performed. To use
mysql_unbuffered_query() while multiple database
connections are open, you must specify the optional parameter
link_identifier to identify which connection
you want to use.
query
The SQL query to execute.
Data inside the query should be properly escaped.
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 no connection is found or established, an
E_WARNING level error 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(), until all rows are fetched. You also have to fetch all result rows from an unbuffered SQL query before you can send a new SQL query to MySQL, using the same
link_identifier.