mysql - MySQL嵌套集检索路径与连接

Question

晚上

我有两张桌子：网址和地点。为了简化，数据是这样的：

网址：

urlID    url
1        /england
2        /scotland
3        /wales

地点：

placeId    name        lft    rgt       urlRef
1          England     1      23000     1
2          Scotland    23001  37000     2
3          Wales       37001  50000     3

然后，places 表在国家/地区内嵌套了更多的地方。我希望能够加入这两个表来选择我的位置的路径，例如：

England     /england
Shropshire  /england/shropshire
Shrewsbury  /england/shropshire/shrewsbury

我首先尝试了这个，它不起作用，其他各种方法也没有。

SELECT node.name, url 
FROM places AS node, places AS parent LEFT JOIN urls ON urlId = node.urlRef
WHERE node.lft BETWEEN parent.lft AND parent.rgt AND urlId = 1
ORDER BY node.lft

Answer 1

您需要加入父节点：

SELECT parent.placeId, parent.name, parent.type, parent.ico, url
FROM places AS node, urls LEFT JOIN places AS parent ON parent.urlRef = urls.urlId
WHERE node.lft BETWEEN parent.lft AND parent.rgt AND node.urlRef = :urlId
ORDER BY parent.lft