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89 lines
2.7 KiB
Python
89 lines
2.7 KiB
Python
10 years ago
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# -*- coding: utf-8 -*-s
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import re
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from sqlalchemy import event
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from sqlalchemy.schema import DDL
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from sqlalchemy.orm.mapper import Mapper
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from sqlalchemy.ext.compiler import compiles
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from sqlalchemy.sql.expression import ClauseElement
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import modes as FullTextMode
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MYSQL = "mysql"
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MYSQL_BUILD_INDEX_QUERY = u"""ALTER TABLE {0.__tablename__} ADD FULLTEXT ({1})"""
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MYSQL_MATCH_AGAINST = u"""
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MATCH ({0})
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AGAINST ("{1}" {2})
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"""
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def escape_quote(string):
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return re.sub(r"[\"\']+", "", string)
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class FullTextSearch(ClauseElement):
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"""
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Search FullText
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:param against: the search query
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:param table: the table needs to be query
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FullText support with in query, i.e.
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>>> from sqlalchemy_fulltext import FullTextSearch
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>>> session.query(Foo).filter(FullTextSearch('Spam', Foo))
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"""
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def __init__(self, against, model, mode=FullTextMode.DEFAULT):
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self.model = model
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self.against = escape_quote(against)
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self.mode = mode
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@compiles(FullTextSearch, MYSQL)
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def __mysql_fulltext_search(element, compiler, **kw):
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assert issubclass(element.model, FullText), "{0} not FullTextable".format(element.model)
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return MYSQL_MATCH_AGAINST.format(",".join(
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element.model.__fulltext_columns__),
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element.against,
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element.mode)
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class FullText(object):
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"""
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FullText Minxin object for SQLAlchemy
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>>> from sqlalchemy_fulltext import FullText
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>>> class Foo(FullText, Base):
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>>> __fulltext_columns__ = ('spam', 'ham')
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>>> ...
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fulltext search spam and ham now
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"""
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__fulltext_columns__ = tuple()
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@classmethod
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def build_fulltext(cls):
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"""
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build up fulltext index after table is created
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"""
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if FullText not in cls.__bases__:
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return
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assert cls.__fulltext_columns__, "Model:{0.__name__} No FullText columns defined".format(cls)
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event.listen(cls.__table__,
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'after_create',
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DDL(MYSQL_BUILD_INDEX_QUERY.format(cls,
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", ".join((escape_quote(c)
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for c in cls.__fulltext_columns__)))
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)
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)
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"""
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TODO: black magic in the future
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@classmethod
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@declared_attr
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def __contains__(*arg):
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return True
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"""
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def __build_fulltext_index(mapper, class_):
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if issubclass(class_, FullText):
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class_.build_fulltext()
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event.listen(Mapper, 'instrument_class', __build_fulltext_index)
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