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added docs description of abstract db types in migration

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replaces #618
This commit is contained in:
Carsten Brandt
2013-07-14 14:47:54 +02:00
parent b427b5fbb0
commit cee45fdf26
1 changed files with 11 additions and 1 deletions
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12
docs/guide/migration.md
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@ -84,7 +84,7 @@ class m101129_185401_create_news_table extends \yii\db\Migration
{
$this->db->createCommand()->createTable('tbl_news, array(
'id' => 'pk',
'title' => 'string NOT NULL',
'title' => 'string(128) NOT NULL',
'content' => 'text',
))->execute();
}
@ -99,6 +99,16 @@ class m101129_185401_create_news_table extends \yii\db\Migration
The base class [\yii\db\Migration] exposes a database connection via `db`
property. You can use it for manipulating data and schema of a database.
The column types used in this example are abstract types that will be replaced
by Yii with the corresponding types depended on your database management system.
You can use them to write database independent migrations.
For example `pk` will be replaced by `int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY`
for MySQL and `integer PRIMARY KEY AUTOINCREMENT NOT NULL` for sqlite.
See documentation of [[QueryBuilder::getColumnType()]] for more details and a list
of available types. You may also use the constants defined in [[\yii\db\Schema]] to
create column types.
Transactional Migrations
------------------------