diff options
Diffstat (limited to 'lib/python2.7/site-packages/south/db/oracle.py')
| -rw-r--r-- | lib/python2.7/site-packages/south/db/oracle.py | 345 |
1 files changed, 0 insertions, 345 deletions
diff --git a/lib/python2.7/site-packages/south/db/oracle.py b/lib/python2.7/site-packages/south/db/oracle.py deleted file mode 100644 index 79496d0..0000000 --- a/lib/python2.7/site-packages/south/db/oracle.py +++ /dev/null @@ -1,345 +0,0 @@ -from __future__ import print_function
-
-import os.path
-import sys
-import re
-import warnings
-import cx_Oracle
-
-
-from django.db import connection, models
-from django.db.backends.util import truncate_name
-from django.core.management.color import no_style
-from django.db.models.fields import NOT_PROVIDED
-from django.db.utils import DatabaseError
-
-# In revision r16016 function get_sequence_name has been transformed into
-# method of DatabaseOperations class. To make code backward-compatible we
-# need to handle both situations.
-try:
- from django.db.backends.oracle.base import get_sequence_name\
- as original_get_sequence_name
-except ImportError:
- original_get_sequence_name = None
-
-from south.db import generic
-
-class DatabaseOperations(generic.DatabaseOperations):
- """
- Oracle implementation of database operations.
- """
- backend_name = 'oracle'
-
- alter_string_set_type = 'ALTER TABLE %(table_name)s MODIFY %(column)s %(type)s %(nullity)s;'
- alter_string_set_default = 'ALTER TABLE %(table_name)s MODIFY %(column)s DEFAULT %(default)s;'
- alter_string_update_nulls_to_default = \
- 'UPDATE %(table_name)s SET %(column)s = %(default)s WHERE %(column)s IS NULL;'
- add_column_string = 'ALTER TABLE %s ADD %s;'
- delete_column_string = 'ALTER TABLE %s DROP COLUMN %s;'
- add_constraint_string = 'ALTER TABLE %(table_name)s ADD CONSTRAINT %(constraint)s %(clause)s'
-
- allows_combined_alters = False
- has_booleans = False
-
- constraints_dict = {
- 'P': 'PRIMARY KEY',
- 'U': 'UNIQUE',
- 'C': 'CHECK',
- 'R': 'FOREIGN KEY'
- }
-
- def get_sequence_name(self, table_name):
- if original_get_sequence_name is None:
- return self._get_connection().ops._get_sequence_name(table_name)
- else:
- return original_get_sequence_name(table_name)
-
- #TODO: This will cause very obscure bugs if anyone uses a column name or string value
- # that looks like a column definition (with 'CHECK', 'DEFAULT' and/or 'NULL' in it)
- # e.g. "CHECK MATE" varchar(10) DEFAULT 'NULL'
- def adj_column_sql(self, col):
- # Syntax fixes -- Oracle is picky about clause order
- col = re.sub('(?P<constr>CHECK \(.*\))(?P<any>.*)(?P<default>DEFAULT \d+)',
- lambda mo: '%s %s%s'%(mo.group('default'), mo.group('constr'), mo.group('any')), col) #syntax fix for boolean/integer field only
- col = re.sub('(?P<not_null>(NOT )?NULL) (?P<misc>(.* )?)(?P<default>DEFAULT.+)',
- lambda mo: '%s %s %s'%(mo.group('default'),mo.group('not_null'),mo.group('misc') or ''), col) #fix order of NULL/NOT NULL and DEFAULT
- return col
-
- def check_meta(self, table_name):
- return table_name in [ m._meta.db_table for m in models.get_models() ] #caching provided by Django
-
- def normalize_name(self, name):
- """
- Get the properly shortened and uppercased identifier as returned by quote_name(), but without the actual quotes.
- """
- nn = self.quote_name(name)
- if nn[0] == '"' and nn[-1] == '"':
- nn = nn[1:-1]
- return nn
-
- @generic.invalidate_table_constraints
- def create_table(self, table_name, fields):
- qn = self.quote_name(table_name)
- columns = []
- autoinc_sql = ''
-
-
- for field_name, field in fields:
-
- field = self._field_sanity(field)
-
- # avoid default values in CREATE TABLE statements (#925)
- field._suppress_default = True
-
-
- col = self.column_sql(table_name, field_name, field)
- if not col:
- continue
- col = self.adj_column_sql(col)
-
- columns.append(col)
- if isinstance(field, models.AutoField):
- autoinc_sql = connection.ops.autoinc_sql(table_name, field_name)
-
- sql = 'CREATE TABLE %s (%s);' % (qn, ', '.join([col for col in columns]))
- self.execute(sql)
- if autoinc_sql:
- self.execute(autoinc_sql[0])
- self.execute(autoinc_sql[1])
-
- @generic.invalidate_table_constraints
- def delete_table(self, table_name, cascade=True):
- qn = self.quote_name(table_name)
-
- # Note: PURGE is not valid syntax for Oracle 9i (it was added in 10)
- if cascade:
- self.execute('DROP TABLE %s CASCADE CONSTRAINTS;' % qn)
- else:
- self.execute('DROP TABLE %s;' % qn)
-
- # If the table has an AutoField a sequence was created.
- sequence_sql = """
-DECLARE
- i INTEGER;
-BEGIN
- SELECT COUNT(*) INTO i FROM USER_CATALOG
- WHERE TABLE_NAME = '%(sq_name)s' AND TABLE_TYPE = 'SEQUENCE';
- IF i = 1 THEN
- EXECUTE IMMEDIATE 'DROP SEQUENCE "%(sq_name)s"';
- END IF;
-END;
-/""" % {'sq_name': self.get_sequence_name(table_name)}
- self.execute(sequence_sql)
-
- @generic.invalidate_table_constraints
- def alter_column(self, table_name, name, field, explicit_name=True, ignore_constraints=False):
-
- if self.dry_run:
- if self.debug:
- print(' - no dry run output for alter_column() due to dynamic DDL, sorry')
- return
-
- qn = self.quote_name(table_name)
-
- # hook for the field to do any resolution prior to it's attributes being queried
- if hasattr(field, 'south_init'):
- field.south_init()
- field = self._field_sanity(field)
-
- # Add _id or whatever if we need to
- field.set_attributes_from_name(name)
- if not explicit_name:
- name = field.column
- qn_col = self.quote_name(name)
-
- # First, change the type
- # This will actually also add any CHECK constraints needed,
- # since e.g. 'type' for a BooleanField is 'NUMBER(1) CHECK (%(qn_column)s IN (0,1))'
- params = {
- 'table_name':qn,
- 'column': qn_col,
- 'type': self._db_type_for_alter_column(field),
- 'nullity': 'NOT NULL',
- 'default': 'NULL'
- }
- if field.null:
- params['nullity'] = 'NULL'
-
- sql_templates = [
- (self.alter_string_set_type, params, []),
- (self.alter_string_set_default, params, []),
- ]
- if not field.null and field.has_default():
- # Use default for rows that had nulls. To support the case where
- # the new default does not fit the old type, we need to first change
- # the column type to the new type, but null=True; then set the default;
- # then complete the type change.
- def change_params(**kw):
- "A little helper for non-destructively changing the params"
- p = params.copy()
- p.update(kw)
- return p
- sql_templates[:0] = [
- (self.alter_string_set_type, change_params(nullity='NULL'),[]),
- (self.alter_string_update_nulls_to_default, change_params(default="%s"), [field.get_default()]),
- ]
-
- if not ignore_constraints:
- # drop CHECK constraints. Make sure this is executed before the ALTER TABLE statements
- # generated above, since those statements recreate the constraints we delete here.
- check_constraints = self._constraints_affecting_columns(table_name, [name], "CHECK")
- for constraint in check_constraints:
- self.execute(self.delete_check_sql % {
- 'table': self.quote_name(table_name),
- 'constraint': self.quote_name(constraint),
- })
- # Drop foreign constraints
- try:
- self.delete_foreign_key(qn, qn_col)
- except ValueError:
- # There weren't any
- pass
-
- for sql_template, params, args in sql_templates:
- try:
- self.execute(sql_template % params, args, print_all_errors=False)
- except DatabaseError as exc:
- description = str(exc)
- # Oracle complains if a column is already NULL/NOT NULL
- if 'ORA-01442' in description or 'ORA-01451' in description:
- # so we just drop NULL/NOT NULL part from target sql and retry
- params['nullity'] = ''
- sql = sql_template % params
- self.execute(sql)
- # Oracle also has issues if we try to change a regular column
- # to a LOB or vice versa (also REF, object, VARRAY or nested
- # table, but these don't come up much in Django apps)
- elif 'ORA-22858' in description or 'ORA-22859' in description:
- self._alter_column_lob_workaround(table_name, name, field)
- else:
- self._print_sql_error(exc, sql_template % params)
- raise
-
- if not ignore_constraints:
- # Add back FK constraints if needed
- if field.rel: #and self.supports_foreign_keys:
- self.add_deferred_sql(
- self.foreign_key_sql(
- qn[1:-1], # foreign_key_sql uses this as part of constraint name
- qn_col[1:-1], # foreign_key_sql uses this as part of constraint name
- field.rel.to._meta.db_table,
- field.rel.to._meta.get_field(field.rel.field_name).column
- )
- )
-
-
- def _alter_column_lob_workaround(self, table_name, name, field):
- """
- Oracle refuses to change a column type from/to LOB to/from a regular
- column. In Django, this shows up when the field is changed from/to
- a TextField.
- What we need to do instead is:
- - Rename the original column
- - Add the desired field as new
- - Update the table to transfer values from old to new
- - Drop old column
- """
- renamed = self._generate_temp_name(name)
- self.rename_column(table_name, name, renamed)
- self.add_column(table_name, name, field, keep_default=False)
- self.execute("UPDATE %s set %s=%s" % (
- self.quote_name(table_name),
- self.quote_name(name),
- self.quote_name(renamed),
- ))
- self.delete_column(table_name, renamed)
-
- def _generate_temp_name(self, for_name):
- suffix = hex(hash(for_name)).upper()[1:]
- return self.normalize_name(for_name + "_" + suffix)
-
- @generic.copy_column_constraints #TODO: Appears to be nulled by the delete decorator below...
- @generic.delete_column_constraints
- def rename_column(self, table_name, old, new):
- if old == new:
- # Short-circuit out
- return []
- self.execute('ALTER TABLE %s RENAME COLUMN %s TO %s;' % (
- self.quote_name(table_name),
- self.quote_name(old),
- self.quote_name(new),
- ))
-
- @generic.invalidate_table_constraints
- def add_column(self, table_name, name, field, keep_default=False):
- field = self._field_sanity(field)
- sql = self.column_sql(table_name, name, field)
- sql = self.adj_column_sql(sql)
-
- if sql:
- params = (
- self.quote_name(table_name),
- sql
- )
- sql = self.add_column_string % params
- self.execute(sql)
-
- # Now, drop the default if we need to
- if field.default is not None:
- field.default = NOT_PROVIDED
- self.alter_column(table_name, name, field, explicit_name=False, ignore_constraints=True)
-
- def delete_column(self, table_name, name):
- return super(DatabaseOperations, self).delete_column(self.quote_name(table_name), name)
-
- def lookup_constraint(self, db_name, table_name, column_name=None):
- if column_name:
- # Column names in the constraint cache come from the database,
- # make sure we use the properly shortened/uppercased version
- # for lookup.
- column_name = self.normalize_name(column_name)
- return super(DatabaseOperations, self).lookup_constraint(db_name, table_name, column_name)
-
- def _constraints_affecting_columns(self, table_name, columns, type="UNIQUE"):
- if columns:
- columns = [self.normalize_name(c) for c in columns]
- return super(DatabaseOperations, self)._constraints_affecting_columns(table_name, columns, type)
-
- def _field_sanity(self, field):
- """
- This particular override stops us sending DEFAULTs for BooleanField.
- """
- if isinstance(field, models.BooleanField) and field.has_default():
- field.default = int(field.to_python(field.get_default()))
- # On Oracle, empty strings are null
- if isinstance(field, (models.CharField, models.TextField)):
- field.null = field.empty_strings_allowed
- return field
-
-
- def _default_value_workaround(self, value):
- from datetime import date,time,datetime
- if isinstance(value, (date,time,datetime)):
- return "'%s'" % value
- else:
- return super(DatabaseOperations, self)._default_value_workaround(value)
-
- def _fill_constraint_cache(self, db_name, table_name):
- self._constraint_cache.setdefault(db_name, {})
- self._constraint_cache[db_name][table_name] = {}
-
- rows = self.execute("""
- SELECT user_cons_columns.constraint_name,
- user_cons_columns.column_name,
- user_constraints.constraint_type
- FROM user_constraints
- JOIN user_cons_columns ON
- user_constraints.table_name = user_cons_columns.table_name AND
- user_constraints.constraint_name = user_cons_columns.constraint_name
- WHERE user_constraints.table_name = '%s'
- """ % self.normalize_name(table_name))
-
- for constraint, column, kind in rows:
- self._constraint_cache[db_name][table_name].setdefault(column, set())
- self._constraint_cache[db_name][table_name][column].add((self.constraints_dict[kind], constraint))
- return
|