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如何加快這裏的速度並更快地更新行? 我知道這不應該是這樣,任何人都可以推薦一個更好的做法。如何在VB.net中更快速地查詢和更新
謝謝
Public Sub searchUpdate()
strSQL = "*Large query, including 3 tables"
cmd = New MySqlCommand(strSQL, CONNECTION)
dr = cmd.ExecuteReader()
ListView1.Items.Clear()
Do While dr.Read()
a = (dr.Item("users").ToString())
b = (dr.Item("b1").ToString() & "," & dr.Item("b2").ToString() & "," & dr.Item("b3").ToString() & "," & dr.Item("b4").ToString() & "," & dr.Item("b5").ToString() & "," & dr.Item("b6").ToString())
won = (dr.Item("number").ToString) * (dr.Item("input").ToString())
qt = (dr.Item("input").ToString)
updateForSearch(a, won, qt)
Loop
dr.Close()
cmd.Dispose()
CONNECTION.Close()
TextBox1.Text = Val(TextBox1.Text) + 1
Timer2.Stop()
End Sub`
功能更新:
Public Function updateForSearch(ByVal a As String, ByVal won As Integer, ByVal qt As Integer) As Integer
dr.Close()
strSQL = "UPDATE users SET status=2, qt='" & qt & "', bcvd='" & won & "' WHERE acvd='" & a & "'"
Dim da As New MySqlDataAdapter(strSQL, CONNECTION)
da.Fill(ds)
dr = cmd.ExecuteReader()
End Function
順便說一句,這是我的查詢:HTTP://pastebin.com/cTM1TgTj – user3224535
這是引擎收錄和我的查詢是2000字符太長回覆這裏 – user3224535
@ user3224535好的。該查詢對我來說並不合適,而且我發現與問題無關。有問題的你選擇「用戶」,「b2」,「數字」,「輸入」。可能對你來說最好的辦法是從複雜查詢中創建一個'View',然後使用該視圖進行更新。規則僅爲3:1 - 您的視圖必須返回用於「用戶」中字段分配的字段。 2 - 您的視圖必須返回用於與「用戶」加入的字段。 3.你的視圖可能需要被聚合,你必須在'inner join'中有一個以上的匹配值。然後它會工作 –