fts4

问题 Hi I´ve tried to run a fuzzymatcher code and the error below pops up: OperationalError: no such module: fts4 Any suggestions? Thanks in advance Edit: I've already tried downloading the sqlite zip from the website and saving it in DLLs files but it still does not work. Do I have to activate it somehow? I´m using Anaconda3 64 bit. Thanks 回答1: Confirm that the DLL files have been added in the correct place; if you are using Windows it will be C:\ProgramData\Anaconda3\DLLs . you can try to load

问题 I have an Android app which searches for data in an SQLite database with FTS4 virtual tables. It works fine, but when the data inside the tables contain special characters (like 'á', 'é', 'í', 'ó', 'ú' or 'ñ') the SQLite MATCH function gives no results. I'm lost at this point. Thanks. 回答1: Attention: default tokenizer is really poor. To get good results you should implement a custom tokenizer. The path isn't so simple: find the tokenizer (with stemmer?) that should fit your need, or develop

问题 I am creating an FTS4 external content table in SQLite like this: CREATE TABLE t2(id INTEGER PRIMARY KEY, col_a, col_b, col_text); CREATE VIRTUAL TABLE fts_table USING fts4(content="t2", col_text); I'm using an external content table so that I don't need to store duplicate values of col_text in fts_table . I'm only indexing col_text because col_a and col_b don't need to be indexed. However, when I do a query of fts_table like this SELECT * FROM fts_table WHERE fts_table MATCH 'something'; I

问题 I've downloaded the latest SQLite 3.7.15.2 shell (Win32) and tried to execute one of the FTS examples exactly as it is written at http://sqlite.org/fts3.html#section_3 -- Virtual table declaration CREATE VIRTUAL TABLE docs USING fts3(); -- Virtual table data INSERT INTO docs(docid, content) VALUES(1, 'a database is a software system'); INSERT INTO docs(docid, content) VALUES(2, 'sqlite is a software system'); INSERT INTO docs(docid, content) VALUES(3, 'sqlite is a database'); -- Return the

问题 I'm trying to order a fast text search so that exact matches are first and partial matches are last. I've created a query that works in SQLiteStudio: SELECT value, 1 AS _order FROM glossfts WHERE glossfts.value MATCH 'dog' UNION SELECT value, 2 AS _order FROM glossfts WHERE glossfts.value MATCH 'dog* NOT dog' ORDER BY _order So the result would be Beware of dog 1 Disliked by everybody, not even a dog will eat 1 Bad dog 1 Creed, dogma 2 Dogs 2 Dogwood 2 And that works great but when I use the

问题 I have read about many posts asking whether the SQLite based full-text search can be done in Android, and all the answers point out that the built-in SQLite of Android does not allow custom tokenizer. The default tokenizer considers the words separated by space or other signs, but Asian words (like Chinese) need its special tokenizer, but Android does not allow adding custom one. The posts I read were years ago. Is there any update in recent Android versions? I just searched and did not find

问题 I have a sqlite3 database. A single table inside this DB can't be dropped, the error message says unknown tokenizer: mm . I tried it directly with the command DROP TABLE tablename; inside the newest SQLiteSpy v1.9.11 and also within .NET code and the official sqlite NuGet package v 1.0.103. How can I drop a table where the tokenizer is unknown? 回答1: The documentation says: For each FTS virtual table in a database, three to five real (non-virtual) tables are created to store the underlying

问题 I'm trying to perform a SQLite FTS query with untrusted user input. I do not want to give the user access to the query syntax, that is they will not be able to perform a match query like foo OR bar AND cats . If they tried to query with that string I would want to interpret it as something more like foo \OR bar \AND cats . There doesn't seem to be anything built in to SQLite for this, so I'll probably end up building my own escaping function, but this seems dangerous and error-prone. Is there

问题 I want to be able to search for numbers like 2.3 using FTS4 in SQLite, but the . is being treated as a token boundary. Short of writing a full bespoke tokenizer is there any other way of excluding the . from the list of token boundary characters? Being able to search for decimal numbers seems like a common use case, but I can't find anything relevant on SO / Google. My best solution at present is to replace all . chars in the text with a known (long) string of letters and substitute

问题 I have a VIEW view_for_search_unit and a FTS4 table FTS_table_search_unit . I inserted data from view_for_search_unit into the FTS table using this command: INSERT INTO FTS_table_search_unit(docId, name, description) SELECT id, name, description FROM view_for_search_unit After I check data in FTS table using this: SELECT *FROM FTS_table_search_unit it has 1000 perfect records(I use fake data). However, when I use the MATCH function in FTS: SELECT * FROM FTS_table_search_unit WHERE FTS_table