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[1.11.x] Fixed #28138 -- Used output type handler instead of numbersA…

…sStrings on Oracle cursor.

Thanks Tim Graham for the review.

Backport of 9467752 from master
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felixxm committed Apr 28, 2017
1 parent e93135b commit d52577b62b3138674807ac74251fab7faed48331
Showing with 15 additions and 2 deletions.
  1. +15 −2 django/db/backends/oracle/
@@ -400,11 +400,24 @@ class FormatStylePlaceholderCursor(object):

def __init__(self, connection):
self.cursor = connection.cursor()
# Necessary to retrieve decimal values without rounding error.
self.cursor.numbersAsStrings = True
self.cursor.outputtypehandler = self._output_type_handler
# Default arraysize of 1 is highly sub-optimal.
self.cursor.arraysize = 100

def _output_type_handler(cursor, name, defaultType, length, precision, scale):
Called for each db column fetched from cursors. Return numbers as
strings so that decimal values don't have rounding error.
if defaultType == Database.NUMBER:
return cursor.var(

def _format_params(self, params):
return {k: OracleParam(v, self, True) for k, v in params.items()}

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