Add these lines in /config/main.php

'components'=>array(
.........
		'db'=>array(
			'connectionString' => 'mysql:host=localhost;dbname=database1',
			'emulatePrepare' => true,
			'username' => 'root',
			'password' => 'itsasecret',
			'charset' => 'utf8',
		),
		'db2'=>array(
		    'class' => 'CDbConnection',
			'connectionString' => 'mysql:host=localhost;dbname=databa...

The customary configuration of a Yii application includes just a single database section in the protected/config/main.php file, but it's easy to extend this to support more than one, tying each Model to one of the databases.

To get null from database instead of empty strings you need to set up your DB connection as follows:

What would you do if you want/need to have a different than the main database connection in an module's models?

Relational databases do not support inheritance so if we need to represent it, we have to somehow store meta info while keeping performance by minimizing JOINs. One way to solve this problem is using single table inheritance. All fields for the whole class tree are stored in a single table. Class name is stored in the type field...

I used another example posted here a while back where the person was modifying the index.php and adding in a switch case for different domains and loading separate config files. This was actually too much for me, because all my portals are the exact same (as far as routes, modules, extensions, etc) and if I ever wanted to add another route it wouldn't be feasible opening up all the config files t...

Virtually all Yii applications are built on top of a database, and though Yii is very flexible in how it addresses your DB, some design choices make things more convenient than others.

This is an incipient implementation of application-driven database with Yii.

I like programing on my localhost, however it really bugged me to make changes to index.php & config files on my production server. After combining all available wiki articles on this topic and some trial and error this is what I use for my applications so I could just upload it to production server and it will work without any changes.

Suppose to have two models: Users and Emails. You do not want to store email in a Users model. And User can have 0 or many emails. This is the form generated to create a new user (just username).

This method allows to log InnoDB monitor output when deadlock error occured. This way we will have much more useful data to find and fix deadlock.

This is a tutorial for how to auto set model values without any code.

To extend further static pages as shown by Qiang http://www.yiiframework.com/wiki/22/how-to-display-static-pages-in-yii/ here're the steps to take:

create a class file under protected\components named RActiveRecord.php

Lately, i needed to deal with the following scenario: read from two databases (db1,db2), and write to a third database (db3).

The classic Yii way for doing an update action is as follows:

Note the tag {{homeUrl}} will be dynamically replaced at runtime.

Suppose we want to set a category to product (or an item in general term), Also suppose categories has sub-categories (multi-level)

According to below wiki we could migrate database schema to another database

Simple Yii Script for performing CRUD operations: