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Command2.ExecuteNonQuery()で "接続プロパティが正しく初期化されていません"というエラーメッセージが表示されます。接続プロパティが正しく初期化されていません
私はSQLクエリ
Dim staffid = TextBox1.Text
Dim conn As New SqlConnection
conn.ConnectionString = SqlDataSource1.ConnectionString
Dim command1 As New SqlCommand("SELECT StaffDetails.StaffID, SUM(HolidayRequests.RequestTotalDays) AS Expr1, HolidayEntitlement.HoldayEntitlementID, HolidayEntitlement.UserName FROM HolidayRequests INNER JOIN StaffDetails ON HolidayRequests.Username = StaffDetails.UserName INNER JOIN HolidayEntitlement ON StaffDetails.UserName = HolidayEntitlement.UserName WHERE (StaffDetails.StaffID = staffID) GROUP BY StaffDetails.StaffID, HolidayRequests.ApprovalStatus, HolidayEntitlement.HoldayEntitlementID, HolidayEntitlement.UserName HAVING (HolidayRequests.ApprovalStatus = N'approved')", conn)
Dim command2 As New SqlCommand()
conn.Open()
Dim rdr As SqlDataReader
rdr = command1.ExecuteReader
Dim UpdateQuery As String
While (rdr.Read())
UpdateQuery = "UPDATE HolidayEntitlement set Holiday_Taken = @Expr1 WHERE HolidayEntitlementID = @HolidayEntitlementID"
command2.Parameters.AddWithValue("@Expr1", rdr("Expr1").ToString())
'run update query
command2.CommandText = UpdateQuery
command2.ExecuteNonQuery()
End while