Question

如何从变量进行批量插入？

我的数据库中有一个Grades表：

PersonId        Marks
---------------------
1                10 
2                15 
3                13 
4                11

我有这个变量

PersonID varchar = "1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20"
Marks varchar = "0,1,2,5,8,9,4,6,7,3,5,2,7,1,9,4,0,2,5,0"

我想使用批量插入将此值插入到成绩表中，我想比较表格和变量之间的标记，如果它的不同我将用新标记替换它

Answer 1

首先，您需要使用XML方法＆amp;分割您的数据。然后，您可以在Table Variable中插入数据，您可以将Grade表更新为Table Variable中可用的新标记： -

DECLARE @ID NVARCHAR(300)= '1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20';
DECLARE @Marks NVARCHAR(300)= '0,1,2,5,8,9,4,6,7,3,5,2,7,1,9,4,0,2,5,0';
DECLARE @StudentsMark TABLE
(id    NVARCHAR(300),
 marks NVARCHAR(300)
); 

;WITH CTE
     AS (
     SELECT Split.a.value('.', 'NVARCHAR(MAX)') id,
            ROW_NUMBER() OVER(ORDER BY
                             (
                                 SELECT NULL
                             )) RN
     FROM
     (
         SELECT CAST('<X>'+REPLACE(@ID, ',', '</X><X>')+'</X>' AS XML) AS String
     ) AS A
     CROSS APPLY String.nodes('/X') AS Split(a)),
     CTE1
     AS (
     SELECT Split.a.value('.', 'NVARCHAR(MAX)') marks,
            ROW_NUMBER() OVER(ORDER BY
                             (
                                 SELECT NULL
                             )) RN
     FROM
     (
         SELECT CAST('<X>'+REPLACE(@Marks, ',', '</X><X>')+'</X>' AS XML) AS String
     ) AS A
     CROSS APPLY String.nodes('/X') AS Split(a))
     INSERT INTO @StudentsMark
            SELECT C.id,
                   C1.marks
            FROM CTE C
                 LEFT JOIN CTE1 C1 ON C1.RN = C.RN;
UPDATE G
  SET
      G.Marks = M.marks
FROM grades G
     INNER JOIN @StudentsMark M ON G.PersonId = M.id;
SELECT *
FROM grades;

结果：

PersonId    Marks
1           0
2           1
3           2
4           5

使用变量的SQL Server批量插入

1 个答案: