SQL 自动覆盖的书页索引

Question

我想实现类似书页的东西。

例如：我有一本书有 100 页，每一页都有唯一的 priority/page 编号，(1-100).

+-----+--------------------------------+------+
| id  |            content             | page |
+-----+--------------------------------+------+
| 1   | cover                          | 1    |
| 2   | prelude                        | 2    |
| ... | ...                            | ...  |
| 50  | and so he do rig a jig jig...  | 50   |
| 51  | and he come to the bus stop... | 51   |
| ... | ...                            | ...  |
| 100 | back-cover                     | 100  |
+-----+--------------------------------+------+

假设我插入了一个新页面，但在页面 50 和 51 之间。所以插入的第priority/page页数是51.

因此，覆盖上面的页码，"OLD" 第 51-100 页将是 52-101。

+-----+--------------------------------+------+
| id  |            content             | page |
+-----+--------------------------------+------+
| 1   | cover                          | 1    |
| 2   | prelude                        | 2    |
| ... | ...                            | ...  |
| 50  | and so he do rig a jig jig...  | 50   |
| 101 | this is a new page             | 51   |
| 51  | and he come to the bus stop... | 52   |
| ... | ...                            | ...  |
| 100 | back-cover                     | 101  |
+-----+--------------------------------+------+

我正在使用 PostgreSQL、TypeORM、TypeScript。

Answer 1

--Updates the table and sets each page value to itself + 1
--Under conditions: the page number is the same as the inserted record but the
--content is different (the original record with that page number)
--Or the page number is greater than the page number of the inserted record    
UPDATE Table
SET [page] = [page] + 1
WHERE ([page] >= insertedPageNumber AND content <> insertedPageContent) OR [page] > insertedPageNumber

SQL 自动覆盖的书页索引

SQL Book page index with auto overwrite

sql

postgresql

typescript

typeorm