You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
131 lines
3.7 KiB
131 lines
3.7 KiB
from ... import exc
|
|
from ... import util
|
|
from ...sql import coercions
|
|
from ...sql import elements
|
|
from ...sql import operators
|
|
from ...sql import roles
|
|
from ...sql.base import _generative
|
|
from ...sql.base import Generative
|
|
|
|
|
|
class match(Generative, elements.BinaryExpression):
|
|
"""Produce a ``MATCH (X, Y) AGAINST ('TEXT')`` clause.
|
|
|
|
E.g.::
|
|
|
|
from sqlalchemy import desc
|
|
from sqlalchemy.dialects.mysql import match
|
|
|
|
match_expr = match(
|
|
users_table.c.firstname,
|
|
users_table.c.lastname,
|
|
against="Firstname Lastname",
|
|
)
|
|
|
|
stmt = (
|
|
select(users_table)
|
|
.where(match_expr.in_boolean_mode())
|
|
.order_by(desc(match_expr))
|
|
)
|
|
|
|
Would produce SQL resembling::
|
|
|
|
SELECT id, firstname, lastname
|
|
FROM user
|
|
WHERE MATCH(firstname, lastname) AGAINST (:param_1 IN BOOLEAN MODE)
|
|
ORDER BY MATCH(firstname, lastname) AGAINST (:param_2) DESC
|
|
|
|
The :func:`_mysql.match` function is a standalone version of the
|
|
:meth:`_sql.ColumnElement.match` method available on all
|
|
SQL expressions, as when :meth:`_expression.ColumnElement.match` is
|
|
used, but allows to pass multiple columns
|
|
|
|
:param cols: column expressions to match against
|
|
|
|
:param against: expression to be compared towards
|
|
|
|
:param in_boolean_mode: boolean, set "boolean mode" to true
|
|
|
|
:param in_natural_language_mode: boolean , set "natural language" to true
|
|
|
|
:param with_query_expansion: boolean, set "query expansion" to true
|
|
|
|
.. versionadded:: 1.4.19
|
|
|
|
.. seealso::
|
|
|
|
:meth:`_expression.ColumnElement.match`
|
|
|
|
"""
|
|
|
|
__visit_name__ = "mysql_match"
|
|
|
|
inherit_cache = True
|
|
|
|
def __init__(self, *cols, **kw):
|
|
if not cols:
|
|
raise exc.ArgumentError("columns are required")
|
|
|
|
against = kw.pop("against", None)
|
|
|
|
if against is None:
|
|
raise exc.ArgumentError("against is required")
|
|
against = coercions.expect(
|
|
roles.ExpressionElementRole,
|
|
against,
|
|
)
|
|
|
|
left = elements.BooleanClauseList._construct_raw(
|
|
operators.comma_op,
|
|
clauses=cols,
|
|
)
|
|
left.group = False
|
|
|
|
flags = util.immutabledict(
|
|
{
|
|
"mysql_boolean_mode": kw.pop("in_boolean_mode", False),
|
|
"mysql_natural_language": kw.pop(
|
|
"in_natural_language_mode", False
|
|
),
|
|
"mysql_query_expansion": kw.pop("with_query_expansion", False),
|
|
}
|
|
)
|
|
|
|
if kw:
|
|
raise exc.ArgumentError("unknown arguments: %s" % (", ".join(kw)))
|
|
|
|
super(match, self).__init__(
|
|
left, against, operators.match_op, modifiers=flags
|
|
)
|
|
|
|
@_generative
|
|
def in_boolean_mode(self):
|
|
"""Apply the "IN BOOLEAN MODE" modifier to the MATCH expression.
|
|
|
|
:return: a new :class:`_mysql.match` instance with modifications
|
|
applied.
|
|
"""
|
|
|
|
self.modifiers = self.modifiers.union({"mysql_boolean_mode": True})
|
|
|
|
@_generative
|
|
def in_natural_language_mode(self):
|
|
"""Apply the "IN NATURAL LANGUAGE MODE" modifier to the MATCH
|
|
expression.
|
|
|
|
:return: a new :class:`_mysql.match` instance with modifications
|
|
applied.
|
|
"""
|
|
|
|
self.modifiers = self.modifiers.union({"mysql_natural_language": True})
|
|
|
|
@_generative
|
|
def with_query_expansion(self):
|
|
"""Apply the "WITH QUERY EXPANSION" modifier to the MATCH expression.
|
|
|
|
:return: a new :class:`_mysql.match` instance with modifications
|
|
applied.
|
|
"""
|
|
|
|
self.modifiers = self.modifiers.union({"mysql_query_expansion": True})
|