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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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CGI::Session::Driver::mysql(3pm)			User Contributed Perl Documentation			  CGI::Session::Driver::mysql(3pm)

NAME
CGI::Session::Driver::mysql - CGI::Session driver for MySQL database SYNOPSIS
$s = CGI::Session->new( 'driver:mysql', $sid); $s = CGI::Session->new( 'driver:mysql', $sid, { DataSource => 'dbi:mysql:test', User => 'sherzodr', Password => 'hello' }); $s = CGI::Session->new( 'driver:mysql', $sid, { Handle => $dbh } ); DESCRIPTION
mysql stores session records in a MySQL table. For details see CGI::Session::Driver::DBI, its parent class. It's especially important for the MySQL driver that the session ID column be defined as a primary key, or at least "unique", like this: CREATE TABLE sessions ( id CHAR(32) NOT NULL PRIMARY KEY, a_session TEXT NOT NULL ); To use different column names, change the 'create table' statement, and then simply do this: $s = CGI::Session->new('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', DataSource=>'dbi:mysql:project', }); or $s = CGI::Session->new('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', Handle=>$dbh, }); DRIVER ARGUMENTS mysql driver supports all the arguments documented in CGI::Session::Driver::DBI. In addition, DataSource argument can optionally leave leading "dbi:mysql:" string out: $s = CGI::Session->new( 'driver:mysql', $sid, {DataSource=>'shopping_cart'}); # is the same as: $s = CGI::Session->new( 'driver:mysql', $sid, {DataSource=>'dbi:mysql:shopping_cart'}); BACKWARDS COMPATIBILITY As of V 4.30, the global variable $CGI::Session::MySQL::TABLE_NAME cannot be used to set the session table's name. This is due to changes in CGI::Session::Driver's new() method, which now allows the table's name to be changed (as well as allowing both the 'id' column name and the 'a_session' column name to be changed). See the documentation for CGI::Session::Driver::DBI for details. In particular, the new syntax for "new()" applies to all database drivers, whereas the old - and bad - global variable method only applied to MySQL. Alternately, call $session -> table_name('new_name') just after creating the session object if you wish to change the session table's name. LICENSING
For support and licensing see CGI::Session. perl v5.12.4 2011-07-08 CGI::Session::Driver::mysql(3pm)
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