关于在存储过程中动态选择数据表名
今天写一个功能,要求站点页面根据不同的城市显示当前城市的内容。这个功能主要是分析用户的Ip,根据Ip获取用户所在的城市,然后选择用户所在城市的内容。由于数据库架构是不同城市的内容分别放在不同的表中,如tb_1_Info, tb_2_Info,其中的数字就是城市对应的编号。在完成这个功能的过程中,我对数据库访问的用的是存储过程,但以前没有碰到在存储过程中动态的选择数据表名称。经过一段时间摸索,还是实现了这个功能,特记录一下:
存储过程代码如下:
存储过程代码如下:
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ALTER PROCEDURE [dbo].[ap_BuyAndSaleAction]
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@DataAction int,
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@ID int = 0,
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@UserID int,
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.
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@TableNum nvarchar(20)--外部函数传入的不同表的参数
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AS
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if @DataAction=0--操作代码:添加、更新、删除标记
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BEGIN
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declare @select varchar(1000)
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select @select = 'insert into [tb_'+rtrim(@TableNum)+'_BuyAndSale]
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(
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[UserID],
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.
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)
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values
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(
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@UserID,
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.
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)'
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EXEC(@select)
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set
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@ID=scope_identity()
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end
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if @DataAction=1
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begin
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declare @update varchar(1000)
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select @update ='UPDATE [tb_'+rtrim(@TableNum)+'_BuyAndSale] SET
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[UserID] = @UserID,
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.
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WHERE
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[ID] = @ID'
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exec(@update)
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end
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if @DataAction=2
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begin
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declare @delete varchar(100)
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select @delete = 'delete from [tb_'+rtrim(@TableNum)+'_BuyAndSale] where [ID] = @ID'
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exec(@delete)
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end
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select @ID
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