MS SQL Server字元拆分函數

Insus.NET以前有用XQuery的nodes()方法寫過一個函數，是MS SQL字元拆分的函數，

今天學習SQL，再嘗試另寫一個：

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:        Insus.NET
-- Create date: 2013-06-30
-- Description:    split string function.
-- =============================================
CREATE FUNCTION [dbo].[udf_Split](@value NVARCHAR(MAX), @delimiter CHAR(1))
RETURNS @Results TABLE ([ID] INT IDENTITY(1,1),[WORD] NVARCHAR(MAX))
AS
BEGIN
    DECLARE @index INT
    DECLARE @slice NVARCHAR(MAX)
 
    SET @index = 1
    IF @value IS NULL 
        RETURN
 
    WHILE @index <> 0
    BEGIN
        SET @index = CHARINDEX(@delimiter, @value)
        IF @index !=0
            SET @slice = LEFT(@value,@index - 1)
        ELSE
            SET @slice = @value
 
        INSERT INTO @Results([WORD]) VALUES(@slice)
        SET @value = RIGHT(@value,LEN(@value) - @index)
 
        IF LEN(@value) = 0 BREAK
    END 
    RETURN
END
 
GO      

udf_Split

例子示範：

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