将逗号分隔值拆分为行

如何将 SQL Server 中逗号分隔的字符串中的值获取到行中，以便将它们插入到表中？

例如，使用以下数据：

 Declare @string as nvarchar(max);
 Declare @substring as nvarchar(50);
 set @string = "Apple, Banana, Cherry, Orange, Mango"

我目前已经硬编码set @last = 2，对于这个例子但是@last应包含字符串中的单词数。参数@substring将在循环中一一包含每个水果，我想用它插入到目标表中。

这是我当前的代码，但我不知道如何设置@last到所需的值：

DECLARE @first AS INT
SET @first = 1
DECLARE @step AS INT
SET @step = 1
DECLARE @last AS INT
SET @last = 2

BEGIN TRANSACTION
WHILE(@first <= @last)
BEGIN

INSERT INTO tbFruit(Name)   
VALUES(@substring);

SET @first += @step
END
COMMIT TRANSACTION

您可以一次性完成这一切，而不是使用WHILE环形。因此，在这段代码中，它将把值推入临时表的行中，然后再使用它INSERT进入目标表：

将逗号分隔值拆分为行的示例代码取自：

将逗号分隔的列值转换为行 https://stackoverflow.com/questions/13873701/convert-comma-separated-column-value-to-rows

DECLARE @string AS NVARCHAR(MAX);
DECLARE @substring AS NVARCHAR(50);
SET @string = 'Apple, Banana, Cherry, Orange, Mango'

SELECT Split.a.value('.', 'VARCHAR(100)') AS Fruits
INTO   #fruits
FROM   
   (
     SELECT CAST ('<M>' + REPLACE(@string, ', ', '</M><M>') + '</M>' AS XML) AS String
   ) AS A
     CROSS APPLY String.nodes('/M') AS Split ( a ); 

-- show what's in the temp table
SELECT *
FROM   #fruits

此时，临时表中的行中已包含值，您可以使用它来填充目标表，如下所示：

INSERT INTO tbFruit ( Name )
SELECT Fruits FROM #fruits

-- show what's in the target table
SELECT * FROM   #target_table

-- tidy up
DROP TABLE #fruits

SQL 小提琴演示 http://sqlfiddle.com/#!6/d41d8/22738

TSQL 代码：

 DECLARE @string AS NVARCHAR(MAX) = 'Apple, Banana, Cherry, Orange, Mango'
 DECLARE @substring AS NVARCHAR(50)

 SELECT Split.a.value('.', 'VARCHAR(100)') AS Fruits
 INTO   #fruits
 FROM   ( SELECT    CAST ('<M>' + REPLACE(@string, ', ', '</M><M>') + '</M>' AS XML) AS String
        ) AS A
        CROSS APPLY String.nodes('/M') AS Split ( a )   

 CREATE TABLE #target_table ( Fruits NVARCHAR(50) )

 INSERT INTO #target_table
        ( fruits )
        SELECT  *
        FROM    #fruits

 SELECT * FROM   #target_table

 DROP TABLE #fruits
 DROP TABLE #target_table

Results:

| FRUITS |
|--------|
|  Apple |
| Banana |
| Cherry |
| Orange |
|  Mango |