/****** Object:  StoredProcedure [dbo].[SpGetNewCode5]    Script Date: 2022/10/23 11:41:19 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[SpGetNewCode5]
 @tableName varchar(50),/*表名*/
 @columnName varchar(30),/*列名*/
 @prefix varchar(50),/*流水号编码前缀*/
 @returnVal nvarchar(50) output
AS
/*获取危险源代码的流水号*/
declare 
        @sql nvarchar(500),
        @old nvarchar(50),
        @newid varchar(50),
        @maxId nvarchar(50)/*已分配的最大值*/
select @sql=N'SELECT @maxId=MAX(right('+@columnName+',9)) from '+@tableName+' where ' + @columnName+' like ' + '''%' + @prefix + '%'''
EXEC sp_executesql @sql, N'@maxId nvarchar(50) OUTPUT', @maxId OUTPUT 
set @old=@maxId
IF(@old is null)
BEGIN
set @newid=@prefix+'00001'
END

ELSE
BEGIN
set @newid = (select max(right(@old,5)))+1
set @newid = @prefix +right('00000'+@newid,5)
END

SET @returnVal=@newid