(PHP 4 = 4.0.6)
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
.
The optional
result_mode
parameter can be MYSQL_USE_RESULT and MYSQL_STORE_RESULT. It
defaults to MYSQL_USE_RESULT, so the result is not buffered.
See also
mysql_query()
for the counterpart of this behaviour.
注意 The benefits of mysql_unbuffered_query() come at a cost: You cannot use mysql_num_rows() 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.
See also:
mysql_query()
.