Question

列视图

+-----------------------+
| name                  |
+-----------------------+
| ELECTRONICS           |
|  TELEVISIONS          |
|   TUBE                |
|   LCD                 |
|   PLASMA              |
|  GAME CONSOLES        |
|  PORTABLE ELECTRONICS |
|   MP3 PLAYERS         |
|    FLASH              |
|   CD PLAYERS          |
|   2 WAY RADIOS        |
|    FRS                |
+-----------------------+

table core.category

Id      ParentId   Name

1       null       ELECTRONICS
2       1          TELEVISIONS
3       2          TUBE
4       2          LCD
5       2          PLASMA
6       1          GAME CONSOLES
7       1          PORTABLE ELECTRONICS
8       7          MP3 PLAYERS
9       8          FLASH
10      7          CD PLAYERS
11      1          2 WAY RADIOS
12      11         FRS

如果我选择1，

结果是（显示儿童和孙子）期望有超过1个祖父母（电子）

+-----+
| id  |
+-----+
| 1   |
| 2   |
| 3   |
| 4   |
| 5   |
| 6   |
| 7   |
| 8   |
| 9   |
| 10  |
| 11  |
| 12  |
+-----+

如果我选择2

结果必须是

+-----+
| id  |
+-----+
| 2   |
| 3   |
| 4   |
| 5   |
+-----+

我选择了这个类别和他的孩子（需要更多输出孙子）

module.exports.categorySearch = function(searchCategory, cb) {
  var query = 'SELECT category_id \
   FROM core.category AS c \
   WHERE category_id = $1::integer
UNION
   SELECT category_id \
   FROM core.category AS c \
   WHERE category_ParentId = $1::integer
;';
  var map = function(err, result) {
     if(err) {
        return cb(err, null);
      }
      var list = [];
      result.rows.forEach(function(row, i) {
        list.push(new Category(row));
      });
      cb(null, list);
    };
  repository.queryDb(query, [searchCategory], map);
};

结果是

+-----+
| id  |
+-----+
| 1   |
| 2   |
| 6   |
| 7   |
| 11  |
+-----+

我应该在我的选择陈述中添加什么

Answer 1

WITH RECURSIVE categorytree AS (
  SELECT c.category_id, 0 as depth
  FROM core.category AS c
  WHERE c.category_id = $1::integer

  UNION ALL

  SELECT c.category_id, t.depth + 1 as depth
  FROM core.category AS c
  INNER JOIN categorytree t
    ON t.category_id = c.category_ParentId
)

SELECT category_id FROM categorytree

显示所选的儿童和孙子女等...

+-----+
| id  |
+-----+
| 1   |
| 2   |
| 3   |
| 4   |
| 5   |
| 6   |
| 7   |
| 8   |
| 9   |
| 10  |
| 11  |
| 12  |
+-----+

子孙的mysql查询

1 个答案: