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Full Discussion: Complex MySQL Query(s)
Top Forums Web Development Complex MySQL Query(s) Post 302453645 by Neo on Thursday 16th of September 2010 01:39:45 AM
Old 09-16-2010
Quote:
Originally Posted by STOIE
@ NEO
I am sure I could do that, but really wanted to package it neatly into a query.
Programming is being done in PERL
Hi Stoie,

I understand completely!

IMHO, the query is 'neater' if smaller and you simply read into an array and use PERL to organize and extract the data you need.

Of course, you can program anyway you like!

I can tell you, from experience with a busy forum driven by PHP and MySQL, that complex MySQL queries cause performance (slow query) problems, are hard to debug, and generally do not perform well. Here, where we do millions and millions of MySQL queries a day, the only queries that cause problems (slow queries) are those written by programmers who embed the logic in the actual query and not in the PHP processing. Based on years of experience with MySQL in these forums, I like simple queries and logic in actual code... just me of course.
 

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DBIx::SearchBuilder::Handle::mysql(3pm) 		User Contributed Perl Documentation		   DBIx::SearchBuilder::Handle::mysql(3pm)

NAME
DBIx::SearchBuilder::Handle::mysql - A mysql specific Handle object SYNOPSIS
DESCRIPTION
This module provides a subclass of DBIx::SearchBuilder::Handle that compensates for some of the idiosyncrasies of MySQL. METHODS
Insert Takes a table name as the first argument and assumes that the rest of the arguments are an array of key-value pairs to be inserted. If the insert succeeds, returns the id of the insert, otherwise, returns a Class::ReturnValue object with the error reported. SimpleUpdateFromSelect Customization of "SimpleUpdateFromSelect" in DBIx::SearchBuilder::Handle. Mysql doesn't support update with subqueries when those fetch data from the table that is updated. DatabaseVersion Returns the mysql version, trimming off any -foo identifier CaseSensitive Returns undef, since mysql's searches are not case sensitive by default SimpleDateTimeFunctions Returns hash reference with specific date time functions of this database for "DateTimeFunction" in DBIx::SearchBuilder::Handle. ConvertTimezoneFunction Custom implementation of "ConvertTimezoneFunction" in DBIx::SearchBuilder::Handle. Use the following query to get list of timezones: SELECT Name FROM mysql.time_zone_name; Read docs about keeping timezone data up to date: http://dev.mysql.com/doc/refman/5.5/en/time-zone-upgrades.html AUTHOR
Jesse Vincent, jesse@fsck.com SEE ALSO
DBIx::SearchBuilder, DBIx::SearchBuilder::Handle perl v5.14.2 2011-09-21 DBIx::SearchBuilder::Handle::mysql(3pm)
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