Question

尝试收集一些传播数据以发送给第三方，并被定向到 this post 。

在 SQL Fiddle 上尝试将其调整到我的用例后，存储过程会保持超时。
所以我在当地试了两次（通过PhpMyAdmin）当我在调用存储过程后尝试在浏览器中重新加载PMA时，我只是得到一个永恒的等待响应＆＃34;旋转器（超过10或20分钟）。

我认为我的SP代码有问题???

CREATE TABLE foo
    (`id` int, `name` varchar(100), `parentId` int, `path` varchar(100))
//

INSERT INTO foo (`id`, `name`, `parentId`, `path`)
VALUES (1, 'discrete', 0, NULL),
       (2, 'res', 1, NULL),
       (3, 'smt', 2, NULL),
       (4, 'cap', 1, NULL),
       (5, 'ind', 1, NULL),
       (6, 'smt', 4, NULL),
       (7, 'tant', 6, NULL),
       (8, 'cer', 6, NULL)
//

CREATE PROCEDURE updatePath()
BEGIN
DECLARE cnt, n int;
    SELECT COUNT(*) INTO n FROM foo WHERE parentId = 0;
    UPDATE foo a, foo b SET a.path = b.name WHERE b.parentId IS NULL AND a.parentId = b.id;
    SELECT count(*) INTO cnt FROM foo WHERE path IS NULL;
    while cnt > n do
        UPDATE foo a, foo b SET a.path = concat(b.path, '|', b.id) WHERE b.path IS NOT NULL AND a.parentId = b.id;
        SELECT count(*) INTO  cnt FROM foo WHERE path IS NULL;
    end while;
END//

修改
预期结果：

VALUES (1, 'discrete', 0, '1'),
       (2, 'res', 1, '1|2'),
       (3, 'smt', 2, '1|2|3'),
       (4, 'cap', 1, '1|4'),
       (5, 'ind', 1, '1|5'),
       (6, 'smt', 4, '1|4|6'),
       (7, 'tant', 6, '1|4|6|7'),
       (8, 'cer', 6, '1|4|6|8');

Answer 1

经过一夜好眠，我带着@Drew的领导，我一次只看了一台。搞定了。我在这里离开了它：

CREATE TABLE foo
    (`id` int, `name` varchar(100), `parentId` int, `path` varchar(100))
//

INSERT INTO foo
    (`id`, `name`, `parentId`, `path`)
VALUES
    (1, 'dscr', 0, NULL),
    (2, 'res', 1, NULL),
    (3, 'smt', 2, NULL),
    (4, 'cap', 1, NULL),
    (5, 'ind', 1, NULL),
    (6, 'chp', 4, NULL),
    (7, 'tant', 6, NULL),
    (8, 'cer', 6, NULL)
//

CREATE PROCEDURE updatePath()
BEGIN
DECLARE cnt, n int;

    SELECT COUNT(*) INTO n FROM foo WHERE parentId = 0; -- n is now 1
    SELECT COUNT(*) INTO cnt FROM foo WHERE path IS NULL; -- cnt is now 8

    UPDATE foo child, foo parent        -- each child now has its parent and own ID's in the path
      SET child.path = CONCAT(parent.id, '|', child.id)
      WHERE parent.parentId = 0
      AND child.parentId = parent.id;

    WHILE cnt > n DO
        UPDATE foo child, foo parent    -- concat parent's path and own ID into each empty child's path
          SET child.path = concat( parent.path,'|',child.id ) 
          WHERE parent.path IS NOT NULL 
          AND child.parentId = parent.id;

        SELECT COUNT(*) INTO  cnt  -- decrement cnt
          FROM foo 
          WHERE path IS NULL;

    END WHILE;

    UPDATE foo  -- set path for any top-level categories
      SET path = id
      WHERE path IS NULL;

END//

call updatePath()//

随意批评。
希望这能帮助别人一段时间。

Answer 2

您是否尝试进行自引用连接以创建层次结构？

选择一个名字， parentName = b.name 从 foo a，外联接foo b （ a.id = b.parentId ）

存储过程超时

2 个答案: