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Full Discussion: PHP/MySQL slow_queries
Top Forums Shell Programming and Scripting PHP/MySQL slow_queries Post 302155565 by jjinno on Friday 4th of January 2008 03:59:21 PM
Old 01-04-2008
First to answer your question, yes MySQL does use some caching to make lookups faster. My example site was more pointing to how fast queries should run even without caching, but either way, I think you got the point.

Secondly, I would not doubt that your code is to blame, but I would doubt that it is the specific 2 lines that you had originally presented. From what I can tell, there should be no problem in issuing those two commands.

Something to try (general coding practice really) is to remove all the fluff, and make a direct query, starting with ALL links, and moving on to a category that you know the name of... AKA - remove the dynamic stuff to run a test.

If there is something "clogging" your MySQL application, its probably not queries, but lingering connections. Check to make sure that you dont accidentally loop through the mysql_connect() function. Also, if running many non-persistent connections, remember to use the mysql_close() function.

As for "guides" on how to do this all, you are left to the mercy of Google for anything complicated. Although I regularly reference The W3School's PHP Tutorial and another friendly DIY site tizag but neither of these compare to the completeness of the PHP/MySQL Function Docs

Hope some/any of this helps.
 

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MYSQL_INSERT_ID(3)							 1							MYSQL_INSERT_ID(3)

mysql_insert_id - Get the ID generated in the last query

SYNOPSIS
Warning This extension is deprecated as of PHP 5.5.0, and will be removed in the future. 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: omysqli_insert_id(3) o PDO::lastInsertId int mysql_insert_id ([resource $link_identifier = NULL]) DESCRIPTION
Retrieves the ID generated for an AUTO_INCREMENT column by the previous query (usually INSERT). o $ link_identifier -The MySQL connection. If the link identifier is not specified, the last link opened by mysql_connect(3) is assumed. If no such link is found, it will try to create one as if mysql_connect(3) was called with no arguments. If no connection is found or established, an E_WARNING level error is generated. The ID generated for an AUTO_INCREMENT column by the previous query on success, 0 if the previous query does not generate an AUTO_INCRE- MENT value, or FALSE if no MySQL connection was established. Example #1 mysql_insert_id(3) example <?php $link = mysql_connect('localhost', 'mysql_user', 'mysql_password'); if (!$link) { die('Could not connect: ' . mysql_error()); } mysql_select_db('mydb'); mysql_query("INSERT INTO mytable (product) values ('kossu')"); printf("Last inserted record has id %d ", mysql_insert_id()); ?> Caution mysql_insert_id(3) will convert the return type of the native MySQL C API function mysql_insert_id() to a type of long (named int in PHP). If your AUTO_INCREMENT column has a column type of BIGINT (64 bits) the conversion may result in an incorrect value. Instead, use the internal MySQL SQL function LAST_INSERT_ID() in an SQL query. For more information about PHP's maximum integer values, please see the integer documentation. Note Because mysql_insert_id(3) acts on the last performed query, be sure to call mysql_insert_id(3) immediately after the query that generates the value. Note The value of the MySQL SQL function LAST_INSERT_ID() always contains the most recently generated AUTO_INCREMENT value, and is not reset between queries. mysql_query(3), mysql_info(3). PHP Documentation Group MYSQL_INSERT_ID(3)
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