c# – 使用用户定义的表类型在SQL中插入和更新

发布时间：2020-12-15 04:09:38 所属栏目：百科来源：网络整理

导读：以下是我创建的新数据类型. CREATE TYPE [dbo].[UpdateHotelTableType] AS TABLE( [ID] [int] NULL,[HotelID] [int] NULL,[FromDate] [datetime] NULL,) 以下是我使用上述数据类型的存储过程. ALTER PROCEDURE [dbo].[SP_Hotel_Info_Update] -- Add the para

以下是我创建的新数据类型.

CREATE TYPE [dbo].[UpdateHotelTableType] AS TABLE(
    [ID] [int] NULL,[HotelID] [int] NULL,[FromDate] [datetime] NULL,)

以下是我使用上述数据类型的存储过程.

ALTER PROCEDURE [dbo].[SP_Hotel_Info_Update]
     -- Add the parameters for the stored procedure here
    @XHotelInfoDetails UpdateHotelTableType READONLY,AS
BEGIN

    Update dbo.HotelInfo
    SET 
    FromDate = r.FromDate,from @XHotelInfoDetails r
    Where HotelInfo.ID = r.ID

END

这适用于数据库中的更新结果.但我想检查id是否存在,如果id不存在,请将行插入表中.否则更新当前记录.在这里,我发送更新数据列表.

任何人都可以通过检查ID的存在来帮助我重新创建存储过程以插入数据.

解决方法

使用 MERGE：

Performs insert,update,or delete operations on a target table based on the results of a join with a source table. For example,you can synchronize two tables by inserting,updating,or deleting rows in one table based on differences found in the other table.

ALTER PROCEDURE [dbo].[SP_Hotel_Info_Update]
     -- Add the parameters for the stored procedure here
    @XHotelInfoDetails UpdateHotelTableType READONLY,AS
BEGIN

    MERGE dbo.HotelInfo AS trg
    USING @XHotelInfoDetails AS src
      ON src.ID = trg.ID
     WHEN MATCHED THEN
       UPDATE SET FromDate = src.FromDate
     WHEN NOT MATCHED BY TARGET THEN
       INSERT (col1,col2,...)
       VALUES (src.col1,src.col2,...);
END

编辑：

In my datatable,there can be newly added rows as well as deleted rows. So how can I compare the id and delete rows from hotelinfo table?

你可以添加新条款：

WHEN NOT MATCHED BY SOURCE [ AND <clause_search_condition> ]  
     THEN DELETE;

具体条件从目标中删除数据.

（编辑：李大同）

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