创建用户定义函数,它是返回值的已保存的 Transact-SQL 例程。用户定义函数不能用于执行一组修改全局数据库状态的操作。与系统函数一样,用户定义函数可以从查询中唤醒调用。也可以像存储过程一样,通过 EXECUTE 语句执行
代码如下:
CREATE FUNCTION fGetStrBySplit
(
@Source VARCHAR(max),
@Index INT,
@SplitChar VARCHAR(1)
)
RETURNS varchar(MAX)
AS
BEGIN
DECLARE @Len INT
DECLARE @n INT = 0
DECLARE @ChIndex INT
DECLARE @Result VARCHAR(MAX)
--获取总长度
SET @Len = LEN(@Source)
--获取切割字符位置
SET @ChIndex = CHARINDEX(@SplitChar,@Source)
WHILE @ChIndex > 0
BEGIN
IF(@n = @Index)
BEGIN
SET @Source = SUBSTRING(@Source,0,@ChIndex)
BREAK
END
SET @Source = SUBSTRING(@Source,@ChIndex+1,@Len)
SET @ChIndex = CHARINDEX(@SplitChar,@Source)
SET @Len = LEN(@Source)
SET @n = @n + 1
END
RETURN @Source
END
GO
--调用
DECLARE @value VARCHAR(max)
SET @value = dbo.fGetStrBySplit('645002*01_45854_183677_12',0,'_')
PRINT @value
结果:
645002*01
--1
45854
--2
183677
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