Lift Mapperでテーブル設計をする際の最小限の知識のまとめ
詳しいことは
ここを見てください。
主にMySQLを使用しているため、DBの用語等はMySQLのものとなります。
よく使われるフィールド
object DefaultFieldModel extends DefaultFieldModel with LongKeyedMetaMapper[DefaultFieldModel]
class DefaultFieldModel extends LongKeyedMapper[DefaultFieldModel]{
def getSingleton = DefaultFieldModel
object idField extends MappedLongIndex(this)
object intField extends MappedInt(this)
object longField extends MappedLong(this)
object varcharField extends MappedString(this,100)// VARCHAR(100)
object textField extends MappedText(this) // TEXT
object dateField extends MappedDate(this) // DATE
object dateTimeField extends MappedDateTime(this) // DATETIME
}
//usage
val newObject = DefaultFieldModel.createInstance
newObject.idField(1)
newObject.textField("hoge")
...
newObject.save()
val read = DefaultFieldModel.findByKey(1L).open_!
println("ID:" + read.idField.is)
AUTO INCREMENTなIDの設定 + CRUD画面の簡単生成
object AutoIncrement extends AutoIncrement with LongKeyedMetaMapper[AutoIncrement] with CRUDify[Long,AutoIncrement]{
/*
def menus : List[Menu]
がCRUDifyにより追加されます
これをSiteMenuMapに追加しておくことでCRUD画面が作成されます。
*/
}
class AutoIncrement extends LongKeyedMapper[AutoIncrement] widh IdPK{
def getSingleton = AutoIncrement
/**
IdPKにて
object id extends MappedLongIndex(this)
のフィールドが作成されます。
*/
}
インデックス、複合インデックスの設定のやりかた
object IndexSample extends IndexSample with LongKeyedMetaMapper[IndexSample]{
//複合インデックス設定
override def dbIndexes = {
List(
new Index(unionIndex1 , unionIndex2 , unionIndex3),
new Index(unionIndex3 , unionIndex2)
)
}
}
class IndexSample extends LongKeyedMapper[IndexSample] widh IdPK{
def getSingleton = AutoIncrement
//フィールドのインデックス設定
object indexForSingleField extends MappedInt(this){
override def dbIndexed_? = true
}
object unionIndex1 extends MappedInt(this)
object unionIndex2 extends MappedInt(this)
object unionIndex3 extends MappedInt(this)
}
OneToOne , OneToMany
object MailBox ...
class MailBox extends LongKeyedMapper[MailBox] with IdPK with OneToMany[Long, MailBox]{
def getSingleton = MailBox
//one to many
object mails extends MappedOneToMany(Mail , Mail.mailBox, OrderBy(Mail.id, Ascending))
}
object Mail ...
class Mail extends LongKeyedMapper[MailBox] with IdPK{
def getSingleton = Mail
//one to one(many to one)
object mailBox extends MappedLongForeignKey(this,MailBox)
}
ManyToMany
object User ...
class User extends LongKeyedMapper[User] with IdPK with ManyToMany{
def getSingleton = User
//many to many
object mails extends MappedManyToMany(Mail , Mail.mailBox, OrderBy(Mail.id, Ascending))
}
object Role...
class Role extends LongKeyedMapper[Role] with IdPK{
def getSingleton = Role
}
object UesrHasRole ...
class UesrHasRole extends Mapper[UserHasRole]{
def getSingleton = UserHasRole
object user extends LongMappedMapper(this,User)
object role extends LongMappedMapper(this,Role)
}
