CREATE PROCEDURE [dbo].[SpGetNewTrustCode5ByProjectId]
 @tableName VARCHAR(50),/*表名*/
 @columnName VARCHAR(50),/*列名*/
 @projectId NVARCHAR(50),/*项目*/
 @prefix VARCHAR(50),/*流水号编码前缀*/
 @returnVal NVARCHAR(50) OUTPUT
AS
/*获取一个新的流水号（后五位上增加）*/
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('+@columnName+') from '+@tableName+' where ProjectId = ''' + @projectId + '''and CH_TrustType=''1'' and   ' + @columnName+' like ' + '''%' + @prefix + '%'''
EXEC sp_executesql @sql, N'@maxId nvarchar(50) OUTPUT', @maxId OUTPUT 
/*因为最后字串包括R1，K1，所以这么处理*/
SET @old=REVERSE(SUBSTRING(REVERSE(@maxId),1,CHARINDEX('-',REVERSE(@maxId))-1)) 

IF(@old IS NULL)
BEGIN
SET @newid=@prefix+'0001'
END

ELSE
BEGIN
SET @newid = (SELECT MAX(LEFT(@old,4)))+1
SET @newid = @prefix +RIGHT('0000'+@newid,4)
END

SET @returnVal=@newid





GO