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02/17/2005 at 12:19AM PST, ID: 21318158
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8.4

MySQL and Recordsets in detail

Asked by rmpalmer in PHP and Databases

Some web applications that I am currently working on require that large amounts of information to be shifted back wards and forwards between a mysql database an the web application. What I need to know is exactly how the web server, mysql, and PHP interact, and what data is stored where in this process. I am not asking for a solution as to how to more the data efficiently, rather where is the data stored (in a pointer, in ram, on the hard disk, etc) and at what times is it stored there.

As an example:

if i were to write: $result = mysql_query("SELECT * FROM `thetable` WHERE 1");

What data does the $result pointer contain? How many bytes, etc. What is currently stored in ram on the server: how much accounts for sql server, what portion is stored  by PHP, in ram.

$row = mysql_fetch_row($result);

What process now takes place, where is the data stored, what changes occur in the sqlserver, what changes occur in PHP's ram, variables etc.

mysql_data_seek($result, 1) - what occurs with a data seek what is pointed to and what happens when it is called, and what happens when the pointer is reset.

Could you please give a step by step break down of the process of a PHP, mysql process similar to that above. Please make it as indepth as possible.
[+][-]02/17/05 06:36 AM, ID: 13334901

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[+][-]02/17/05 02:24 PM, ID: 13340092

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[+][-]02/17/05 11:04 PM, ID: 13343124

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About this solution

Zone: PHP and Databases
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Solution Provided By: matt_mcswain
Participating Experts: 2
Solution Grade: A
 
 
[+][-]02/17/05 11:51 PM, ID: 13343281

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