先说下原理：
根据前缀从表中取出符合该前缀的最大单号，或者最大批号/编码
然后在尾数上+1
单号规则为：【前缀】+【日期格式】+【流水】
日期可以没有，即：【前缀】+【流水】
-- =============================================
-- Author: 陈恩点
-- Create date: 2020-04-18
-- Description: 自动根据前缀生成新的编码
-- =============================================
ALTER PROCEDURE [dbo].[MyRapid_AutoBatchNo]
@BatchNo NVARCHAR(100) OUTPUT,
@TableName NVARCHAR(100),
@ColumnName NVARCHAR(100),
@Heard NVARCHAR(50) = \'SN\',
@Format NVARCHAR(50) = \'yyyyMMdd\',
@Length INT = 4
AS
BEGIN
DECLARE @Body NVARCHAR(100)
DECLARE @SqlScript NVARCHAR(MAX)
DECLARE @LastBatchNo NVARCHAR(100)
SET @Body = @Heard --+ CONVERT(NVARCHAR(50) ,GETDATE() ,112) --FORMAT(GETDATE(),@Format)
IF ISNULL(@Format ,\'\') != \'\'
BEGIN
SET @Body = @Heard + FORMAT(GETDATE(),@Format) --CONVERT(NVARCHAR(50) ,GETDATE() ,112)
END
----取出最大的符合条件的单号
--SELECT @LastBatchNo = ISNULL(MAX(LEFT(PurchaseOrder_Name,16)),\'PORD202008120000\')
----取符合条件的前面几位，字符串比对是从前向后依次比对
--FROM PSI_PurchaseOrder
--WHERE PurchaseOrder_Name LIKE \'PORD20200812____%\'
----最后的%允许在合法批号后面添加后缀
--AND PATINDEX(\'%[^0-9]%\' ,SUBSTRING(PurchaseOrder_Name,13,4)) = 0
----保证流水号是数字可以递增
SET @SqlScript = \'SELECT @LastBatchNo = ISNULL(MAX(LEFT(\' + @ColumnName + \',\'+ CONVERT(NVARCHAR(50) ,LEN(@Body) + @Length) +\')),\'\'\'+@Body + REPLICATE(\'0\' ,@Length) +\'\'\')
FROM \'+ @TableName +\'
WHERE \' + @ColumnName + \' LIKE \'\'\' + @Body + REPLICATE(\'_\' ,@Length) + \'%\'\'
AND PATINDEX(\'\'%[^0-9]%\'\' ,SUBSTRING(\'+ @ColumnName +\',\' + CONVERT(NVARCHAR(50),LEN(@Body) + 1) + \',\'+ CONVERT(NVARCHAR(50),@Length)+\')) = 0\' --这条件为了保证流水号是数字
PRINT @SqlScript
EXEC SP_EXECUTESQL @SqlScript ,N\'@LastBatchNo NVARCHAR(100) OUT\', @LastBatchNo OUT
DECLARE @BatchNo_Seed INT
DECLARE @BatchNo_Tail NVARCHAR(100)
SET @BatchNo_Tail = SUBSTRING(@LastBatchNo, LEN(@Body) + 1 ,@Length)
SET @BatchNo_Seed =CONVERT(INT,@BatchNo_Tail)+1
SET @BatchNo = @Body + REPLICATE (\'0\' ,@Length - LEN(@BatchNo_Seed) ) + CONVERT(NVARCHAR(100),@BatchNo_Seed)
END
GO