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8.2

Usage of SQL_CALC_FOUND_ROWS

Asked by speedpacket in MySQL Server

Tags: mysql, total rowcount, total row count, limit, large tables

Hi,

I was a bit afraid of signing up, but wow - the answers on this board are absolutely fantastic, so I signed up and hopefully someone will be able to answer my question as well...

I have written a datagrid which needs to display data from a query. The input is a query of course, and for that query, the data is selected / paginated.

One of the things we need is total row count for the query. This query however can take ANY form and in some cases unfortunately features a UNION or otherwise...

My method for getting the total rowcount is attached.

As you can see this is a nasty problem when we're having LOTS of records(where I run into now: 2M+ records) because with the inner select it is going to be stored in memory for the outer select.

I read about using SQL_CALC_FOUND_ROWS on here (see related solution), but I don't really see how I can use this within this function is the result of $this->MakeSQLQuery() can take virtually any form... What if that query contains a union?

Any idea on how I might be able to work around my issue?

thanks a lot!
David.

View the Solution FREE for 30 Days

         
           
           
             function getRowCount($args) {
            if(!is_null($this->_md["meta"]["rows"]["totalcount"])) {
                return $this->_md["meta"]["rows"]["totalcount"];
            } else {           
                global $db;   
                $sql = "SELECT COUNT(*) as counter FROM (" . $this->MakeSQLQuery() . ") countTable";                               
                $rs = $db->Execute($sql);               
                return $rs->fields["counter"];
            }
        }

           
         

Related Solutions: Return total row count with LIMIT parameter in MySQL

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Usage of SQL_CALC_FOUND_ROWS

Asked by speedpacket in MySQL Server

Tags: mysql, total rowcount, total row count, limit, large tables

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