在系统中经常会遇到向数据库中批量插入数据情况,存储过程中没有数组,只有通过字符串分割循环插入,下面是一个本人研究的一个例子:
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create proc [dbo].[Proc_TestBatchMainDetailIns] @mainName nvarchar(50),@detailNameStr nvarchar( max ),@detailAgeStr nvarchar( max ), @detailRowCount int =1,@tmpFlag int =1,@newMainId int =0 as begin insert into TestProBatch_Main(MainName) values (@mainName) select @newMainId=@@IDENTITY set @detailRowCount=len(@detailNameStr)-len( replace (@detailNameStr, '|' , '' ))+1 set @detailNameStr=@detailNameStr+ '|' set @detailAgeStr=@detailAgeStr+ '|' while(@tmpFlag<=@detailRowCount) begin insert into TestProcBatch_Detail(MainId,DetailName,DetailAge) values (@newMainId,dbo.F_RtnStrBySplitIndex(@detailNameStr,@tmpFlag),dbo.F_RtnStrBySplitIndex(@detailAgeStr,@tmpFlag)) set @tmpFlag=@tmpFlag+1 end end |
这个例子是插入一条主单信息和对应的多条子信息,下面是两张表
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--主表 CREATE TABLE [dbo].[TestProBatch_Main]( [ID] [ int ] IDENTITY(1,1) NOT NULL primary key , [MainName] [nvarchar](50) NOT NULL , [CreateTime] [datetime] NOT NULL ); --子表 CREATE TABLE [dbo].[TestProcBatch_Detail]( [ID] [ int ] IDENTITY(1,1) NOT NULL primary key , [MainId] [ int ] NOT NULL , [DetailName] [nvarchar](50) NOT NULL , [DetailAge] [ int ] NOT NULL , [CreateTime] [datetime] NOT NULL ); |
dbo.F_RtnStrBySplitIndex是自定义的标量值函数,用于返回第几个分割符对应的字符串,如dbo.F_RtnStrBySplitIndex('jack|lilei|tom|nike',3) 则返回tom
下面是函数的创建
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create function [dbo].[F_RtnStrBySplitIndex](@procStr nvarchar( max ),@splitStrIdx int ) returns nvarchar(250) as begin declare @rtnStr nvarchar(250) declare @currentSplitIdx int declare @preSplitIdx int set @currentSplitIdx=dbo.F_RtnSomeCharIdxInStrByNo( '|' ,@procStr,@splitStrIdx) set @preSplitIdx=dbo.F_RtnSomeCharIdxInStrByNo( '|' ,@procStr,@splitStrIdx-1) set @rtnStr= SUBSTRING (@procStr,@preSplitIdx+1,@currentSplitIdx-@preSplitIdx-1) return @rtnStr end |
这个函数当中又用到了另一个函数dbo.F_RtnSomeCharIdxInStrByNo,用于返回某个字符在一个字符串的位置,下面是该函数的定义:
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ALTER function [dbo].[F_RtnSomeCharIdxInStrByNo](@findSplitStr varchar (250), @procStr varchar (8000), @n smallint ) returns int as begin if @n < 1 return (0) declare @start smallint , @ count smallint , @ index smallint , @len smallint set @ index = charindex(@findSplitStr, @procStr) if @ index = 0 return (0) else select @ count = 1, @len = len(@findSplitStr) while @ index > 0 and @ count < @n begin set @start = @ index + @len select @ index = charindex(@findSplitStr, @procStr, @start), @ count = @ count + 1 end if @ count < @n set @ index = 0 return (@ index ) end |
调用存储过程:exec Proc_TestBatchMainDetailIns 'mainName1','jack|lilei|tom|nike','20|18|22|17'
下面是成功插入后查询到的结果: