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Fixed #17339 -- Factor out has_result into database backend.

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Thanks jonash.
This commit is contained in:
Tim Graham 2013-07-08 11:05:08 -04:00
parent c0a4894dca
commit 95eb68c98f
2 changed files with 11 additions and 3 deletions
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10
django/db/models/sql/compiler.py
View File

@ -750,6 +750,16 @@ class SQLCompiler(object):
yield row
def has_results(self):
"""
Backends (e.g. NoSQL) can override this in order to use optimized
versions of "query has any results."
"""
# This is always executed on a query clone, so we can modify self.query
self.query.add_extra({'a': 1}, None, None, None, None, None)
self.query.set_extra_mask(['a'])
return bool(self.execute_sql(SINGLE))
def execute_sql(self, result_type=MULTI):
"""
Run the query against the database and returns the result(s). The

4
django/db/models/sql/query.py
View File

@ -401,12 +401,10 @@ class Query(object):
def has_results(self, using):
q = self.clone()
q.clear_select_clause()
q.add_extra({'a': 1}, None, None, None, None, None)
q.set_extra_mask(['a'])
q.clear_ordering(True)
q.set_limits(high=1)
compiler = q.get_compiler(using=using)
return bool(compiler.execute_sql(SINGLE))
return compiler.has_results()
def combine(self, rhs, connector):
"""