如何将字符串列表传递给存储过程删除的SQL参数

Question

我有以下方法，该方法应该从列表中给出的数据库中删除假日名称，这些方法被作为参数传递。我遇到的问题是，它没有从数据库中删除任何内容。这是我有问题的方法的一部分：

private void RemoveGloOrderDays(List<SessionInfoList> sessionList, List<Holiday> selectedOrderHolidays, List<Holiday> selectedHolidays, List<string> orderDays, List<string> noOrderDays)
        {
            try
            {
                using (SqlCommand cmd = new SqlCommand())
                using (SqlConnection connection = new SqlConnection(ConnectionString))
                {
                    cmd.CommandTimeout = 600;
                    cmd.CommandText = "[dbo].[RemoveGlobalOrderDays]";
                    cmd.CommandType = CommandType.StoredProcedure;
                    cmd.Connection = connection;
                    cmd.Parameters.Add("@SessionId", SqlDbType.Int);
                    cmd.Parameters.Add("@SelectedOrderHolidays", SqlDbType.NVarChar);
                    cmd.Parameters.Add("@SelectedHolidays", SqlDbType.NVarChar);
                    cmd.Parameters.Add("@OrderDays", SqlDbType.NVarChar);
                    cmd.Parameters.Add("@NoOrderDays", SqlDbType.NVarChar);
                    connection.Open();
                    foreach (SessionInfoList session in sessionList)
                    {
                        cmd.Parameters["@SessionId"].Value = session.SessionID;
                        cmd.Parameters["@SelectedOrderHolidays"].Value = DBNull.Value;
                        string joinedNames = string.Join(",", selectedOrderHolidays.Select(h => h.Name.Trim()));
                        if (!string.IsNullOrEmpty(joinedNames))
                        {
                            cmd.Parameters["@SelectedOrderHolidays"].Value = joinedNames;
                        }
                        cmd.Parameters["@SelectedHolidays"].Value = DBNull.Value;
                        joinedNames = string.Join(",", selectedHolidays.Select(h => h.Name.Trim()));
                        if (!string.IsNullOrEmpty(joinedNames))
                        {
                            cmd.Parameters["@SelectedHolidays"].Value = joinedNames;
                        }

这是我的存储过程：

IF OBJECT_ID('[dbo].[RemoveGlobalOrderDays]') IS NOT NULL
DROP PROCEDURE [dbo].[RemoveGlobalOrderDays]
GO
CREATE PROCEDURE [dbo].[RemoveGlobalOrderDays]
@SessionId int,
@SelectedHolidays nvarchar(500),
@SelectedOrderHolidays nvarchar(500),
@OrderDays nvarchar(500),
@NoOrderDays nvarchar(500)

WITH ENCRYPTION
AS
    BEGIN
    SET NOCOUNT ON;
    UPDATE [cfgSchedule]
    SET
        [OrderDays] = @OrderDays,
        [NoOrderDays] = @NoOrderDays
    WHERE [cfgSchedule].[SessionId] = @SessionID
    DELETE FROM [SessionHolidayMapping]
    WHERE [HolidayName] = @SelectedHolidays
    AND
    [SessionId] = @SessionId
    DELETE FROM [SessionOrderHolidayMapping]
    WHERE [SessionId] = @SessionId
    AND
    [HolidayName] = @SelectedOrderHolidays
END
GO

Answer 1

据我所知，您正在通过逗号分隔的名称列表，您想删除所有这些名称。您需要在操作员中使用应删除的所有假日名称。

这是一个为@SelectedHolidays做到的示例：

declare @SelectedHolidays nvarchar(500) = 'H1,H2,H3'
declare @SelectedHolidaysXml xml = cast(replace(N'<R><I>' + @SelectedHolidays + N'</I></R>', ',', '</I><I>') as xml)

DELETE FROM [SessionHolidayMapping]
WHERE [HolidayName] in (select x.items.value('(.)[1]', 'NVARCHAR(500)') from @SelectedHolidaysXml.nodes('/R/I') as x(items))
AND [SessionId] = @SessionId

这很丑

而不是使用nvarchar，您可以使用表值参数@selectedHolidays和@SelectedHolidays和@SelectedHolidays，然后是

之类的东西

DELETE [SessionHolidayMapping] FROM [SessionHolidayMapping] A
    Inner join @selectedholidays S
    On A.[HolidayName] = S.Holidayname where A.[SessionId] = @SessionId.

"假日名称"是参数的一列。

我在手机上，无法进行适当的测试。