如何使用anko和kotlin获取sqlite表的max-id值?

DBRecordTable._ID 是一个 INTEGER + PRIMARY_KEY+ AUTOINCREMENT ,我希望得到一个表的最大id值,如果表中没有数据行,则返回零。

我试着写代码 select(tableName,DBRecordTable._ID).orderBy(DBRecordTable._ID, Desc).limit(1) ,但这不正确,我如何修复它?

代码

class DBRecordHandler(private val mDBHelper: DBRecordHelper =DBRecordHelper.instance,
                      private val tableName:String =DBRecordTable.TableNAME,
                      private val idField:String=DBRecordTable._ID
                      ) {

 fun getMaxID():Long=mDBHelper.use{
      var myList=select(tableName,DBRecordTable._ID).orderBy(DBRecordTable._ID, Desc).limit(1); 
 }

}



class DBRecordHelper(mContext: Context = UIApp.instance) : ManagedSQLiteOpenHelper(mContext, DB_NAME, null, DB_VERSION) {

    companion object {
        const val DB_NAME = "record.db"
        const val DB_VERSION = 5
        val instance by lazy { DBRecordHelper() }
    }

    override fun onCreate(db: SQLiteDatabase) {
        db.createTable( DBRecordTable.TableNAME , true,
            DBRecordTable._ID to INTEGER + PRIMARY_KEY+ AUTOINCREMENT,           
            DBRecordTable.CreatedDate to INTEGER
        )
    }   

}