未填充SQlite FTS表

时间:2019-11-28 20:16:05

标签: sqlite full-text-search populate

DROP TABLE IF EXISTS TEXTS;
CREATE TABLE TEXTS (text_id int PRIMARY KEY, text ntext,last_update datetime DEFAULT 
CURRENT_TIMESTAMP);
DROP TABLE IF EXISTS FTSTEXTS;
CREATE VIRTUAL TABLE FTSTEXTS USING fts5(text,content="TEXTS",content_rowid="text_id",tokenize=unicode61);
Insert into texts (text_id,text) values (1,'first'),(2,'second'),(3,'third'),(4,'fourth');
Insert into ftstexts (rowid,text) values (1,'first'),(2,'second'),(3,'third'),(4,'fourth');
update texts set text='5555' where text_id=2;
update ftstexts set text='5555' where rowid=2;
select text from texts where text_id=(select rowid from ftstexts where text match('second') limit 1);

result is "5555"

在创建表并将第2行的值更新为“ 5555”后,查询

select rowid from ftstexts where text match('second') limit 1

返回2:

如何填充FTS表以从fts搜索中排除“秒”一词?

查询已在SQLITEStudio 3.2.1上运行

1 个答案:

答案 0 :(得分:1)

外部内容FTS5表不支持更新。您必须删除一行的旧内容,然后将新内容作为单独的步骤插入。

documentation包含一些示例触发器,用于自动使此类表与保存实际数据的表保持同步。

您可能会使更新触发类似

CREATE TRIGGER texts_au AFTER UPDATE ON texts BEGIN
  INSERT INTO ftstexts(ftstexts, rowid, text) VALUES('delete', old.text_id, old.text);
  INSERT INTO ftstexts(rowid, text) VALUES (new.text_id, new.text);
END;