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;