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Sqlite3 extensions
==================
* Define custom aggregates, collations and functions
* Basic support for virtual tables
* Basic support for FTS3/4
* Specify isolation level in transactions
Example usage of the Full-text search:
class Document(FTSModel):
title = TextField() # type affinities are ignored in FTS
content = TextField()
Document.create_table(tokenize='porter') # use the porter stemmer
# populate the documents using normal operations.
for doc in documents:
Document.create(title=doc['title'], content=doc['content'])
# use the "match" operation for FTS queries.
matching_docs = Document.select().where(match(Document.title, 'some query'))
# to sort by best match, use the custom "rank" function.
best_docs = (Document
.select(Document, Document.rank('score'))
.where(match(Document.title, 'some query'))
.order_by(SQL('score')))
# or use the shortcut method.
best_docs = Document.match('some phrase')
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parent INTEGER (unique identifier of parent element or NULL)
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Generate a `MATCH` expression appropriate for searching this table.
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Requires SQLite >= 3.9.0.
Table options:
content: table name of external content, or empty string for "contentless"
content_rowid: column name of external content primary key
prefix: integer(s). Ex: '2' or '2 3 4'
tokenize: porter, unicode61, ascii. Ex: 'porter unicode61'
The unicode tokenizer supports the following parameters:
* remove_diacritics (1 or 0, default is 1)
* tokenchars (string of characters, e.g. '-_'
* separators (string of characters)
Parameters are passed as alternating parameter name and value, so:
{'tokenize': "unicode61 remove_diacritics 0 tokenchars '-_'"}
Content-less tables:
If you don't need the full-text content in it's original form, you can
specify a content-less table. Searches and auxiliary functions will work
as usual, but the only values returned when SELECT-ing can be rowid. Also
content-less tables do not support UPDATE or DELETE.
External content tables:
You can set up triggers to sync these, e.g.
-- Create a table. And an external content fts5 table to index it.
CREATE TABLE tbl(a INTEGER PRIMARY KEY, b);
CREATE VIRTUAL TABLE ft USING fts5(b, content='tbl', content_rowid='a');
-- Triggers to keep the FTS index up to date.
CREATE TRIGGER tbl_ai AFTER INSERT ON tbl BEGIN
INSERT INTO ft(rowid, b) VALUES (new.a, new.b);
END;
CREATE TRIGGER tbl_ad AFTER DELETE ON tbl BEGIN
INSERT INTO ft(fts_idx, rowid, b) VALUES('delete', old.a, old.b);
END;
CREATE TRIGGER tbl_au AFTER UPDATE ON tbl BEGIN
INSERT INTO ft(fts_idx, rowid, b) VALUES('delete', old.a, old.b);
INSERT INTO ft(rowid, b) VALUES (new.a, new.b);
END;
Built-in auxiliary functions:
* bm25(tbl[, weight_0, ... weight_n])
* highlight(tbl, col_idx, prefix, suffix)
* snippet(tbl, col_idx, prefix, suffix, ?, max_tokens)
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