玩滑動：選擇*從表忽略sortBy

Question

我有以下play/slick 3.0代碼讀取整個表。它運作良好，所不同的是SQL語句不加order by（即使它適用sortBy可能是什麼問題

def readMany = { 
    val db = Database.forConfig("dbconfig") 
    var list = new ListBuffer[UserVO]() 
    try { 
     val users = TableQuery[UserDB] 
     val action = users.result 
     users.sortBy(_.userid) 
     val future = db.run(action).map(_.foreach { 
     case (u) => list += u 
     }) 
     val result = Await.result(future, 10 seconds) 
     println(action.statements.head) // <-- prints "select userid,col1,col2 from users" 
    } finally db.close 
    list 
    } 

Answer 1

這是如何使用sortBy：？

def readMany = { 
    val db = Database.forConfig("dbconfig") 
    var list = new ListBuffer[UserVO]() 
    try { 
     val users = TableQuery[UserDB] 


     val action = users.sortBy(_.userid).result <-- sortBy example 

     val future = db.run(action).map(_.foreach { 
     case (u) => list += u 
     }) 
     val result = Await.result(future, 10 seconds) 
     println(action.statements.head) 
    } finally db.close 
    list 
    }