插入时如何将行值增加1

Question

我有一张名为LocationProduct的表，其结构如下，

+--------------+-------------+-----------+
| FkLocationId | FkProductId | SortValue |
+--------------+-------------+-----------+
| 1            | 100         | 1         |
+--------------+-------------+-----------+
| 1            | 101         | 2         |
+--------------+-------------+-----------+
| 1            | 102         | 3         |
+--------------+-------------+-----------+
| 1            | 103         | 4         |
+--------------+-------------+-----------+
| 1            | 104         | 5         |
+--------------+-------------+-----------+
| 1            | 105         | 6         |
+--------------+-------------+-----------+
| 2            | 100         | 1         |
+--------------+-------------+-----------+
| 2            | 101         | 2         |
+--------------+-------------+-----------+
| 2            | 102         | 3         |
+--------------+-------------+-----------+
| 2            | 103         | 4         |
+--------------+-------------+-----------+
| 2            | 104         | 5         |
+--------------+-------------+-----------+
| 2            | 105         | 6         |
+--------------+-------------+-----------+

现在我需要在插入新行时将SortValue 列的值加一。例如，

INSERT INTO BranchServices(FkBranchId,FkServiceId,SortValue)
VALUES(1,106,1)

我需要将FkLocationId = 1相关的SortValue更新一，我需要如下输出，

+--------------+-------------+-----------+
| FkLocationId | FkProductId | SortValue |
+--------------+-------------+-----------+
| 1            | 100         | 2         |
+--------------+-------------+-----------+
| 1            | 101         | 3         |
+--------------+-------------+-----------+
| 1            | 102         | 4         |
+--------------+-------------+-----------+
| 1            | 103         | 5         |
+--------------+-------------+-----------+
| 1            | 104         | 6         |
+--------------+-------------+-----------+
| 1            | 105         | 7         |
+--------------+-------------+-----------+
| 1            | 106         | 1         |
+--------------+-------------+-----------+

在这里你可以看到我将每条旧记录的 SortValue 更新了一个。我该怎么做？

Answer 1

在一个事务中首先UPDATE 值然后执行INSERT。

UPDATE branchservices
       SET sortvalue = sortvalue + 1
       WHERE sortvalue >= 1;

INSERT INTO branchservices
            (fkbranchid,
             fkserviceid,
             sortvalue)
            VALUES (1,
                    106,
                    1);