我正在尝试编写查询以将文件名插入下表 path
CREATE SEQUENCE path_id_seq;
CREATE TABLE path (
id INTEGER PRIMARY KEY DEFAULT NEXTVAL('path_id_seq'),
parent_id INTEGER,
name TEXT NOT NULL);
CREATE UNIQUE INDEX path_parent_id_name_ix
ON path (COALESCE(parent_id, 0), name);
ALTER TABLE path
ADD CONSTRAINT ios_path_parent_id_fk
FOREIGN KEY (parent_id) REFERENCES path (id)
ON DELETE CASCADE
DEFERRABLE INITIALLY DEFERRED;
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例如,给定文件名Assets/images/a.png
,Assets/images/b.png
我想插入以下行。
id | parent_id | name
----+-----------+-------------------
1 | ¤ | Assets
2 | 1 | images
3 | 2 | a.png
4 | 2 | b.png …
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