How to query one to many mysql


 
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Old 10-30-2008
How to query one to many mysql

Hi there,

I have a hierarchical database that include 4 tables. Table A is the parent of B, B is Parent of C, C is parent of D. If I want to query everything in D that is associated with A.name, how do I do that? Thanks!

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

NAME
CGI::Session::Driver::mysql - CGI::Session driver for MySQL database SYNOPSIS
$s = new CGI::Session( 'driver:mysql', $sid); $s = new CGI::Session( 'driver:mysql', $sid, { DataSource => 'dbi:mysql:test', User => 'sherzodr', Password => 'hello' }); $s = new CGI::Session( '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 = new CGI::Session('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', DataSource=>'dbi:mysql:project', }); or $s = new CGI::Session('driver:mysql', undef, { TableName=>'session', IdColName=>'my_id', DataColName=>'my_data', Handle=>$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 = new CGI::Session( 'driver:mysql', $sid, {DataSource=>'shopping_cart'}); # is the same as: $s = new CGI::Session( '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 v5.16.3 2008-07-16 CGI::Session::Driver::mysql(3)