Yii: Check Column Exists before Create Column with Migration Script

You need only 3 simple step to Create Column via Migration Script.

Step 1:
- Create Migration Script with yiic command:
- Goto project and run the following command

protected/yiic migrate create alter_table_column

Step 2:
- Go to folder path protected/migrations and look for file name mxxxxxx_xxxxx_alter_table_column.php
- Add the following command in function up.

public function up()
 {
  $table = Yii::app()->db->schema->getTable('table_name');
  if(!isset($table->columns['column_name'])) {
      // Column doesn't exist then create column
   $this->addColumn('table_name', 'column_name', 'int(11) NOT NULL');
  }
 }

Step 3:
- Run migration script with the following command:

protected/yiic migrate 

~ EOF. Thanks for Reading. ~