author | Sverre Rabbelier <srabbelier@gmail.com> |
Fri, 06 Mar 2009 22:32:26 +0000 | |
changeset 1700 | 599a5ff8f422 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Custom Query class for Oracle. |
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Derives from: django.db.models.sql.query.Query |
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""" |
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|
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import datetime |
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|
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from django.db.backends import util |
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|
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# Cache. Maps default query class to new Oracle query class. |
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_classes = {} |
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|
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def query_class(QueryClass, Database): |
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""" |
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Returns a custom django.db.models.sql.query.Query subclass that is |
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appropriate for Oracle. |
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|
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The 'Database' module (cx_Oracle) is passed in here so that all the setup |
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required to import it only needs to be done by the calling module. |
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""" |
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global _classes |
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try: |
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return _classes[QueryClass] |
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except KeyError: |
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pass |
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|
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class OracleQuery(QueryClass): |
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def resolve_columns(self, row, fields=()): |
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# If this query has limit/offset information, then we expect the |
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# first column to be an extra "_RN" column that we need to throw |
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# away. |
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if self.high_mark is not None or self.low_mark: |
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rn_offset = 1 |
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else: |
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rn_offset = 0 |
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index_start = rn_offset + len(self.extra_select.keys()) |
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values = [self.convert_values(v, None) |
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for v in row[rn_offset:index_start]] |
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for value, field in map(None, row[index_start:], fields): |
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values.append(self.convert_values(value, field)) |
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return values |
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|
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def convert_values(self, value, field): |
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from django.db.models.fields import DateField, DateTimeField, \ |
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TimeField, BooleanField, NullBooleanField, DecimalField, Field |
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if isinstance(value, Database.LOB): |
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value = value.read() |
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# Oracle stores empty strings as null. We need to undo this in |
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# order to adhere to the Django convention of using the empty |
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# string instead of null, but only if the field accepts the |
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# empty string. |
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if value is None and isinstance(field, Field) and field.empty_strings_allowed: |
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value = u'' |
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# Convert 1 or 0 to True or False |
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elif value in (1, 0) and isinstance(field, (BooleanField, NullBooleanField)): |
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value = bool(value) |
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# Convert floats to decimals |
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elif value is not None and isinstance(field, DecimalField): |
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value = util.typecast_decimal(field.format_number(value)) |
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# cx_Oracle always returns datetime.datetime objects for |
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# DATE and TIMESTAMP columns, but Django wants to see a |
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# python datetime.date, .time, or .datetime. We use the type |
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# of the Field to determine which to cast to, but it's not |
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# always available. |
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# As a workaround, we cast to date if all the time-related |
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# values are 0, or to time if the date is 1/1/1900. |
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# This could be cleaned a bit by adding a method to the Field |
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# classes to normalize values from the database (the to_python |
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# method is used for validation and isn't what we want here). |
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elif isinstance(value, Database.Timestamp): |
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# In Python 2.3, the cx_Oracle driver returns its own |
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# Timestamp object that we must convert to a datetime class. |
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if not isinstance(value, datetime.datetime): |
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value = datetime.datetime(value.year, value.month, |
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value.day, value.hour, value.minute, value.second, |
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value.fsecond) |
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if isinstance(field, DateTimeField): |
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# DateTimeField subclasses DateField so must be checked |
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# first. |
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pass |
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elif isinstance(field, DateField): |
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value = value.date() |
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elif isinstance(field, TimeField) or (value.year == 1900 and value.month == value.day == 1): |
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value = value.time() |
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elif value.hour == value.minute == value.second == value.microsecond == 0: |
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value = value.date() |
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return value |
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|
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def as_sql(self, with_limits=True, with_col_aliases=False): |
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""" |
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Creates the SQL for this query. Returns the SQL string and list |
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of parameters. This is overriden from the original Query class |
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to handle the additional SQL Oracle requires to emulate LIMIT |
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and OFFSET. |
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|
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If 'with_limits' is False, any limit/offset information is not |
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included in the query. |
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""" |
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# The `do_offset` flag indicates whether we need to construct |
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# the SQL needed to use limit/offset with Oracle. |
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do_offset = with_limits and (self.high_mark is not None |
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or self.low_mark) |
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if not do_offset: |
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sql, params = super(OracleQuery, self).as_sql(with_limits=False, |
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with_col_aliases=with_col_aliases) |
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else: |
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sql, params = super(OracleQuery, self).as_sql(with_limits=False, |
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with_col_aliases=True) |
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# Wrap the base query in an outer SELECT * with boundaries on |
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# the "_RN" column. This is the canonical way to emulate LIMIT |
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113 |
# and OFFSET on Oracle. |
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sql = 'SELECT * FROM (SELECT ROW_NUMBER() OVER (ORDER BY 1) AS "_RN", "_SUB".* FROM (%s) "_SUB") WHERE "_RN" > %d' % (sql, self.low_mark) |
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115 |
if self.high_mark is not None: |
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sql = '%s AND "_RN" <= %d' % (sql, self.high_mark) |
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117 |
|
323
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118 |
return sql, params |
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119 |
|
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120 |
_classes[QueryClass] = OracleQuery |
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121 |
return OracleQuery |