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c# - 如何将字符串列表传递给要删除的存储过程的sql参数？

问题描述

我有以下方法应该从作为参数传入的列表中给出的数据库中删除假日名称。我遇到的问题是它没有从数据库中删除任何内容。这是我遇到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

标签： c#sqlasp.net-coreasp.net-core-webapi

解决方案

据我所知，您正在传递以逗号分隔的名称列表，并且您想删除所有这些名称。您需要使用 IN 运算符查找应删除的所有假日名称。

以下是如何为@SelectedHolidays 执行此操作的示例：

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

它很难看，但我不知道在 sql server 中拆分逗号分隔值的更好方法。

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