forked from s442783/HighNeed_projekt_inz
46 lines
1.7 KiB
Python
46 lines
1.7 KiB
Python
from django.db.models.sql import compiler
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class SQLCompiler(compiler.SQLCompiler):
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def as_subquery_condition(self, alias, columns, compiler):
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qn = compiler.quote_name_unless_alias
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qn2 = self.connection.ops.quote_name
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sql, params = self.as_sql()
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return '(%s) IN (%s)' % (', '.join('%s.%s' % (qn(alias), qn2(column)) for column in columns), sql), params
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class SQLInsertCompiler(compiler.SQLInsertCompiler, SQLCompiler):
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pass
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class SQLDeleteCompiler(compiler.SQLDeleteCompiler, SQLCompiler):
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def as_sql(self):
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# Prefer the non-standard DELETE FROM syntax over the SQL generated by
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# the SQLDeleteCompiler's default implementation when multiple tables
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# are involved since MySQL/MariaDB will generate a more efficient query
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# plan than when using a subquery.
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where, having = self.query.where.split_having()
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if self.single_alias or having:
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# DELETE FROM cannot be used when filtering against aggregates
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# since it doesn't allow for GROUP BY and HAVING clauses.
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return super().as_sql()
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result = [
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'DELETE %s FROM' % self.quote_name_unless_alias(
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self.query.get_initial_alias()
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)
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]
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from_sql, from_params = self.get_from_clause()
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result.extend(from_sql)
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where_sql, where_params = self.compile(where)
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if where_sql:
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result.append('WHERE %s' % where_sql)
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return ' '.join(result), tuple(from_params) + tuple(where_params)
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class SQLUpdateCompiler(compiler.SQLUpdateCompiler, SQLCompiler):
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pass
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class SQLAggregateCompiler(compiler.SQLAggregateCompiler, SQLCompiler):
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pass
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