Yii 抽象資料庫欄位類型的支援

Yii Migration 支援多種抽象欄位類型，如下所示：

• pk: an auto-incremental primary key type, will be converted into "int(11) NOT NULL AUTO_INCREMENT PRIMARY KEY"
• string: string type, will be converted into "varchar(255)"
• text: a long string type, will be converted into "text"
• integer: integer type, will be converted into "int(11)"
• boolean: boolean type, will be converted into "tinyint(1)"
• float: float number type, will be converted into "float"
• decimal: decimal number type, will be converted into "decimal"
• datetime: datetime type, will be converted into "datetime"
• timestamp: timestamp type, will be converted into "timestamp"
• time: time type, will be converted into "time"
• date: date type, will be converted into "date"
• binary: binary data type, will be converted into "blob"