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authorxiubuzhe <xiubuzhe@sina.com>2023-10-08 20:59:00 +0800
committerxiubuzhe <xiubuzhe@sina.com>2023-10-08 20:59:00 +0800
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+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})