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Merge pull request #295 from niphlod/enhancement/mssql4

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improved performance on mssql4
This commit is contained in:
mdipierro
2013-11-16 01:24:55 -08:00
parent b11bdddfe2 7c8c9bc3af
commit 9883590a91
1 changed files with 12 additions and 6 deletions
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18
gluon/dal.py
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@@ -3458,15 +3458,21 @@ class MSSQL4Adapter(MSSQLAdapter):
""" support for true pagination in MSSQL >= 2012"""
def select_limitby(self, sql_s, sql_f, sql_t, sql_w, sql_o, limitby):
if not sql_o:
#if there is no orderby, we can't use the brand new statements
#that being said, developer chose its own poison, so be it random
sql_o += ' ORDER BY %s' % self.RANDOM()
if limitby:
(lmin, lmax) = limitby
sql_o += ' OFFSET %i ROWS FETCH NEXT %i ROWS ONLY' % (lmin, lmax - lmin)
if lmin == 0:
#top is still slightly faster, especially because
#web2py's default to fetch references is to not specify
#an orderby clause
sql_s += ' TOP %i' % lmax
else:
if not sql_o:
#if there is no orderby, we can't use the brand new statements
#that being said, developer chose its own poison, so be it random
sql_o += ' ORDER BY %s' % self.RANDOM()
sql_o += ' OFFSET %i ROWS FETCH NEXT %i ROWS ONLY' % (lmin, lmax - lmin)
return 'SELECT %s %s FROM %s%s%s;' % \
(sql_s, sql_f, sql_t, sql_w, sql_o)
(sql_s, sql_f, sql_t, sql_w, sql_o)
def rowslice(self,rows,minimum=0,maximum=None):
return rows