mysql_unbuffered_query
mysql_unbuffered_query
Send an SQL query to MariaDB without fetching and buffering the result rows.
Description
resource mysql_unbuffered_query(string query,
resource link_identifier= =NULL);
mysql_unbuffered_query
sends the SQL query query
to MariaDB 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.
Parameters
query
-
The SQL query to execute.
Data inside the query should be properly escaped.
link_identifier
-
The MariaDB 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 ifmysql_connect
was called with no arguments. If no connection is found or established, anE_WARNING
level error is generated.
Return Values
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.
Notes
NoteThe 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
.
See Also
mysql_query |