MySQL and PHP
Copyright 1997-2021 the PHP Documentation Group.
mysql_unbuffered_query
Send an SQL query to MySQL without fetching and buffering the result rows
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 and related FAQ for more information. Alternatives to this function include:
See: Buffered and Unbuffered queries |
resource mysql_unbuffered_query(string 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_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 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.
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
.
mysql_query
|