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from django.core.exceptions import FieldError, FullResultSet
from django.db.models.expressions import Col
from django.db.models.sql import compiler
class SQLCompiler(compiler.SQLCompiler):
def as_subquery_condition(self, alias, columns, compiler):
qn = compiler.quote_name_unless_alias
qn2 = self.connection.ops.quote_name
sql, params = self.as_sql()
return (
"(%s) IN (%s)"
% (
", ".join("%s.%s" % (qn(alias), qn2(column)) for column in columns),
sql,
),
params,
)
class SQLInsertCompiler(compiler.SQLInsertCompiler, SQLCompiler):
pass
class SQLDeleteCompiler(compiler.SQLDeleteCompiler, SQLCompiler):
def as_sql(self):
# Prefer the non-standard DELETE FROM syntax over the SQL generated by
# the SQLDeleteCompiler's default implementation when multiple tables
# are involved since MySQL/MariaDB will generate a more efficient query
# plan than when using a subquery.
where, having, qualify = self.query.where.split_having_qualify(
must_group_by=self.query.group_by is not None
)
if self.single_alias or having or qualify:
# DELETE FROM cannot be used when filtering against aggregates or
# window functions as it doesn't allow for GROUP BY/HAVING clauses
# and the subquery wrapping (necessary to emulate QUALIFY).
return super().as_sql()
result = [
"DELETE %s FROM"
% self.quote_name_unless_alias(self.query.get_initial_alias())
]
from_sql, params = self.get_from_clause()
result.extend(from_sql)
try:
where_sql, where_params = self.compile(where)
except FullResultSet:
pass
else:
result.append("WHERE %s" % where_sql)
params.extend(where_params)
return " ".join(result), tuple(params)
class SQLUpdateCompiler(compiler.SQLUpdateCompiler, SQLCompiler):
def as_sql(self):
update_query, update_params = super().as_sql()
# MySQL and MariaDB support UPDATE ... ORDER BY syntax.
if self.query.order_by:
order_by_sql = []
order_by_params = []
db_table = self.query.get_meta().db_table
try:
for resolved, (sql, params, _) in self.get_order_by():
if (
isinstance(resolved.expression, Col)
and resolved.expression.alias != db_table
):
# Ignore ordering if it contains joined fields, because
# they cannot be used in the ORDER BY clause.
raise FieldError
order_by_sql.append(sql)
order_by_params.extend(params)
update_query += " ORDER BY " + ", ".join(order_by_sql)
update_params += tuple(order_by_params)
except FieldError:
# Ignore ordering if it contains annotations, because they're
# removed in .update() and cannot be resolved.
pass
return update_query, update_params
class SQLAggregateCompiler(compiler.SQLAggregateCompiler, SQLCompiler):
pass
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