查找担保圈-step2-拆分成员表函数

 USE [test]
 GO
 /****** Object:  UserDefinedFunction [dbo].[tf_split_char]    Script Date: 2019/7/8 14:39:15 ******/
 SET ANSI_NULLS ON
 GO
 SET QUOTED_IDENTIFIER ON
 GO
 ALTER FUNCTION [dbo].[tf_split_char]
 (
     @cstring NVARCHAR(MAX), --被拆分的字符串
     @csplit NVARCHAR(1)     --分隔符
 )
 RETURNS @t TABLE
 (
     id INT IDENTITY(1, 1) PRIMARY KEY,
     cchar NVARCHAR(MAX) NOT NULL
 )
 AS
 BEGIN
     DECLARE @ilocation INT = 0;
     DECLARE @inextlocation INT = 1;
     DECLARE @ilen INT;
     WHILE @inextlocation > 0
     BEGIN
         SET @inextlocation = CHARINDEX(@csplit, @cstring, @ilocation + 1);
         SET @ilen = CASE
                         WHEN @inextlocation > 0 THEN
                             @inextlocation
                         ELSE
                             LEN(@cstring) + 1
                     END - @ilocation - 1;
         INSERT INTO @t
         (
             cchar
         )
         VALUES
         (SUBSTRING(@cstring, @ilocation + 1, @ilen));
         SET @ilocation = @inextlocation;
     END;
     RETURN;
 END;