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Code Issues 25 Releases Wiki Activity

Fixed #9136: Do slicing in Oracle with rownum instead of row_number() for a speed improvement. Thanks, Guillaume Taglang.

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git-svn-id: http://code.djangoproject.com/svn/django/trunk@9235 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Ian Kelly 2008-10-18 00:00:20 +00:00
parent 9feebb10f9
commit 934025e58d
1 changed files with 3 additions and 2 deletions
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django/db/backends/oracle/query.py
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@ -111,9 +111,10 @@ def query_class(QueryClass, Database):
# Wrap the base query in an outer SELECT * with boundaries on # Wrap the base query in an outer SELECT * with boundaries on
# the "_RN" column. This is the canonical way to emulate LIMIT # the "_RN" column. This is the canonical way to emulate LIMIT
# and OFFSET on Oracle. # and OFFSET on Oracle.
sql = 'SELECT * FROM (SELECT ROW_NUMBER() OVER (ORDER BY 1) AS "_RN", "_SUB".* FROM (%s) "_SUB") WHERE "_RN" > %d' % (sql, self.low_mark) high_where = ''
if self.high_mark is not None: if self.high_mark is not None:
sql = '%s AND "_RN" <= %d' % (sql, self.high_mark) high_where = 'WHERE ROWNUM <= %d' % (self.high_mark,)
sql = 'SELECT * FROM (SELECT ROWNUM AS "_RN", "_SUB".* FROM (%s) "_SUB" %s) WHERE "_RN" > %d' % (sql, high_where, self.low_mark)
return sql, params return sql, params