[英]MS SQL query parameter passed, but not recognized in VB.net
我已經為此努力了一段時間。
我有一個從表中檢索字段並從中填充輸入的函數,但是,當我嘗試執行該函數時,收到一條錯誤消息:“過程或函數'Quad_GetAllFields'需要參數'@subWeek',但未提供”。
我知道我正在提供參數,因為我可以從函數的任何位置訪問它。
該函數是:
Protected Sub setAllFields(ByVal myConnection As SqlConnection, ByVal subWeek As String, ByVal site As String)
Dim myCommand = New SqlCommand("Quad_GetAllFields", myConnection)
myCommand.Parameters.AddWithValue("@subWeek", subWeek)
myCommand.Parameters.AddWithValue("@site", site)
Dim myDataReader As SqlDataReader = myCommand.ExecuteReader()
If myDataReader.Read() Then
'populate fields
End If
End Sub
存儲過程為:
ALTER PROCEDURE dbo.Quad_GetAllFields
(
@subWeek VARCHAR(50),
@site VARCHAR(20)
)
AS
BEGIN
SELECT TOP (1) ID, Priority1, Priority2, Priority3, Priority4, Highlight1, Highlight2, Highlight3, Highlight4, Update1, Update2, Update3, Ahead1, Ahead2, Ahead3, Outlook1, Outlook2, Comments, Site, Week, Submitted FROM Charts WHERE Week = @subWeek AND Site = @site ORDER BY ID DESC
END
對我做錯了什么有幫助嗎?
我在使用存儲過程方面還很陌生,但是仍然找不到問題。
謝謝
您必須將SqlCommand's
CommandType
屬性設置為StoredProcedure
,默認為Text
:
Protected Sub setAllFields(ByVal myConnection As SqlConnection, ByVal subWeek As String, ByVal site As String)
Dim myCommand = New SqlCommand("Quad_GetAllFields", myConnection)
myCommand.CommandType = CommandType.StoredProcedure
myCommand.Parameters.AddWithValue("@subWeek", subWeek)
myCommand.Parameters.AddWithValue("@site", site)
Dim myDataReader As SqlDataReader = myCommand.ExecuteReader()
If myDataReader.Read() Then
'populate fields'
End If
End Sub
如果您的字符串參數@subWeek為空,則會出現此錯誤。
如果字符串為null,則需要為@subWeek傳遞DBNull.Value。
嘗試對@subWeek值進行硬編碼
myCommand.Parameters.AddWithValue("@subWeek", "Myvalue")
這應該工作正常。
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