mirror of https://github.com/django/django.git
Moved postgresql backend DatabaseOperations class into a new module, postgresql/operations.py, so that it can be imported by both the postgresql and postgresql_psycopg2 backends. Hence the two backends no longer have a duplicated DatabaseOperations class
git-svn-id: http://code.djangoproject.com/svn/django/trunk@5972 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
parent
c2c3e93096
commit
f4b397087c
|
|
@ -5,7 +5,8 @@ Requires psycopg 1: http://initd.org/projects/psycopg1
|
|||
"""
|
||||
|
||||
from django.utils.encoding import smart_str, smart_unicode
|
||||
from django.db.backends import BaseDatabaseWrapper, BaseDatabaseOperations, util
|
||||
from django.db.backends import BaseDatabaseWrapper, util
|
||||
from django.db.backends.postgresql.operations import DatabaseOperations
|
||||
try:
|
||||
import psycopg as Database
|
||||
except ImportError, e:
|
||||
|
|
@ -55,110 +56,6 @@ class UnicodeCursorWrapper(object):
|
|||
else:
|
||||
return getattr(self.cursor, attr)
|
||||
|
||||
postgres_version = None
|
||||
|
||||
class DatabaseOperations(BaseDatabaseOperations):
|
||||
def date_extract_sql(self, lookup_type, field_name):
|
||||
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
|
||||
return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name)
|
||||
|
||||
def date_trunc_sql(self, lookup_type, field_name):
|
||||
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
|
||||
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
|
||||
|
||||
def deferrable_sql(self):
|
||||
return " DEFERRABLE INITIALLY DEFERRED"
|
||||
|
||||
def last_insert_id(self, cursor, table_name, pk_name):
|
||||
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
|
||||
return cursor.fetchone()[0]
|
||||
|
||||
def quote_name(self, name):
|
||||
if name.startswith('"') and name.endswith('"'):
|
||||
return name # Quoting once is enough.
|
||||
return '"%s"' % name
|
||||
|
||||
def sql_flush(self, style, tables, sequences):
|
||||
if tables:
|
||||
if postgres_version[0] >= 8 and postgres_version[1] >= 1:
|
||||
# Postgres 8.1+ can do 'TRUNCATE x, y, z...;'. In fact, it *has to*
|
||||
# in order to be able to truncate tables referenced by a foreign
|
||||
# key in any other table. The result is a single SQL TRUNCATE
|
||||
# statement.
|
||||
sql = ['%s %s;' % \
|
||||
(style.SQL_KEYWORD('TRUNCATE'),
|
||||
style.SQL_FIELD(', '.join([self.quote_name(table) for table in tables]))
|
||||
)]
|
||||
else:
|
||||
# Older versions of Postgres can't do TRUNCATE in a single call, so
|
||||
# they must use a simple delete.
|
||||
sql = ['%s %s %s;' % \
|
||||
(style.SQL_KEYWORD('DELETE'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_FIELD(self.quote_name(table))
|
||||
) for table in tables]
|
||||
|
||||
# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements
|
||||
# to reset sequence indices
|
||||
for sequence_info in sequences:
|
||||
table_name = sequence_info['table']
|
||||
column_name = sequence_info['column']
|
||||
if column_name and len(column_name)>0:
|
||||
# sequence name in this case will be <table>_<column>_seq
|
||||
sql.append("%s %s %s %s %s %s;" % \
|
||||
(style.SQL_KEYWORD('ALTER'),
|
||||
style.SQL_KEYWORD('SEQUENCE'),
|
||||
style.SQL_FIELD(self.quote_name('%s_%s_seq' % (table_name, column_name))),
|
||||
style.SQL_KEYWORD('RESTART'),
|
||||
style.SQL_KEYWORD('WITH'),
|
||||
style.SQL_FIELD('1')
|
||||
)
|
||||
)
|
||||
else:
|
||||
# sequence name in this case will be <table>_id_seq
|
||||
sql.append("%s %s %s %s %s %s;" % \
|
||||
(style.SQL_KEYWORD('ALTER'),
|
||||
style.SQL_KEYWORD('SEQUENCE'),
|
||||
style.SQL_FIELD(self.quote_name('%s_id_seq' % table_name)),
|
||||
style.SQL_KEYWORD('RESTART'),
|
||||
style.SQL_KEYWORD('WITH'),
|
||||
style.SQL_FIELD('1')
|
||||
)
|
||||
)
|
||||
return sql
|
||||
else:
|
||||
return []
|
||||
|
||||
def sequence_reset_sql(self, style, model_list):
|
||||
from django.db import models
|
||||
output = []
|
||||
qn = self.quote_name
|
||||
for model in model_list:
|
||||
# Use `coalesce` to set the sequence for each model to the max pk value if there are records,
|
||||
# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true
|
||||
# if there are records (as the max pk value is already in use), otherwise set it to false.
|
||||
for f in model._meta.fields:
|
||||
if isinstance(f, models.AutoField):
|
||||
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
|
||||
(style.SQL_KEYWORD('SELECT'),
|
||||
style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))),
|
||||
style.SQL_FIELD(qn(f.column)),
|
||||
style.SQL_FIELD(qn(f.column)),
|
||||
style.SQL_KEYWORD('IS NOT'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_TABLE(qn(model._meta.db_table))))
|
||||
break # Only one AutoField is allowed per model, so don't bother continuing.
|
||||
for f in model._meta.many_to_many:
|
||||
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
|
||||
(style.SQL_KEYWORD('SELECT'),
|
||||
style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())),
|
||||
style.SQL_FIELD(qn('id')),
|
||||
style.SQL_FIELD(qn('id')),
|
||||
style.SQL_KEYWORD('IS NOT'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_TABLE(f.m2m_db_table())))
|
||||
return output
|
||||
|
||||
class DatabaseWrapper(BaseDatabaseWrapper):
|
||||
ops = DatabaseOperations()
|
||||
|
||||
|
|
@ -185,10 +82,9 @@ class DatabaseWrapper(BaseDatabaseWrapper):
|
|||
cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
|
||||
cursor.execute("SET client_encoding to 'UNICODE'")
|
||||
cursor = UnicodeCursorWrapper(cursor, 'utf-8')
|
||||
global postgres_version
|
||||
if not postgres_version:
|
||||
if self.ops.postgres_version is None:
|
||||
cursor.execute("SELECT version()")
|
||||
postgres_version = [int(val) for val in cursor.fetchone()[0].split()[1].split('.')]
|
||||
self.ops.postgres_version = [int(val) for val in cursor.fetchone()[0].split()[1].split('.')]
|
||||
return cursor
|
||||
|
||||
allows_group_by_ordinal = True
|
||||
|
|
|
|||
|
|
@ -0,0 +1,109 @@
|
|||
from django.db.backends import BaseDatabaseOperations
|
||||
|
||||
# This DatabaseOperations class lives in here instead of base.py because it's
|
||||
# used by both the 'postgresql' and 'postgresql_psycopg2' backends.
|
||||
|
||||
class DatabaseOperations(BaseDatabaseOperations):
|
||||
def __init__(self, postgres_version=None):
|
||||
self.postgres_version = postgres_version
|
||||
|
||||
def date_extract_sql(self, lookup_type, field_name):
|
||||
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
|
||||
return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name)
|
||||
|
||||
def date_trunc_sql(self, lookup_type, field_name):
|
||||
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
|
||||
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
|
||||
|
||||
def deferrable_sql(self):
|
||||
return " DEFERRABLE INITIALLY DEFERRED"
|
||||
|
||||
def last_insert_id(self, cursor, table_name, pk_name):
|
||||
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
|
||||
return cursor.fetchone()[0]
|
||||
|
||||
def quote_name(self, name):
|
||||
if name.startswith('"') and name.endswith('"'):
|
||||
return name # Quoting once is enough.
|
||||
return '"%s"' % name
|
||||
|
||||
def sql_flush(self, style, tables, sequences):
|
||||
if tables:
|
||||
if self.postgres_version[0] >= 8 and self.postgres_version[1] >= 1:
|
||||
# Postgres 8.1+ can do 'TRUNCATE x, y, z...;'. In fact, it *has to*
|
||||
# in order to be able to truncate tables referenced by a foreign
|
||||
# key in any other table. The result is a single SQL TRUNCATE
|
||||
# statement.
|
||||
sql = ['%s %s;' % \
|
||||
(style.SQL_KEYWORD('TRUNCATE'),
|
||||
style.SQL_FIELD(', '.join([self.quote_name(table) for table in tables]))
|
||||
)]
|
||||
else:
|
||||
# Older versions of Postgres can't do TRUNCATE in a single call, so
|
||||
# they must use a simple delete.
|
||||
sql = ['%s %s %s;' % \
|
||||
(style.SQL_KEYWORD('DELETE'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_FIELD(self.quote_name(table))
|
||||
) for table in tables]
|
||||
|
||||
# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements
|
||||
# to reset sequence indices
|
||||
for sequence_info in sequences:
|
||||
table_name = sequence_info['table']
|
||||
column_name = sequence_info['column']
|
||||
if column_name and len(column_name)>0:
|
||||
# sequence name in this case will be <table>_<column>_seq
|
||||
sql.append("%s %s %s %s %s %s;" % \
|
||||
(style.SQL_KEYWORD('ALTER'),
|
||||
style.SQL_KEYWORD('SEQUENCE'),
|
||||
style.SQL_FIELD(self.quote_name('%s_%s_seq' % (table_name, column_name))),
|
||||
style.SQL_KEYWORD('RESTART'),
|
||||
style.SQL_KEYWORD('WITH'),
|
||||
style.SQL_FIELD('1')
|
||||
)
|
||||
)
|
||||
else:
|
||||
# sequence name in this case will be <table>_id_seq
|
||||
sql.append("%s %s %s %s %s %s;" % \
|
||||
(style.SQL_KEYWORD('ALTER'),
|
||||
style.SQL_KEYWORD('SEQUENCE'),
|
||||
style.SQL_FIELD(self.quote_name('%s_id_seq' % table_name)),
|
||||
style.SQL_KEYWORD('RESTART'),
|
||||
style.SQL_KEYWORD('WITH'),
|
||||
style.SQL_FIELD('1')
|
||||
)
|
||||
)
|
||||
return sql
|
||||
else:
|
||||
return []
|
||||
|
||||
def sequence_reset_sql(self, style, model_list):
|
||||
from django.db import models
|
||||
output = []
|
||||
qn = self.quote_name
|
||||
for model in model_list:
|
||||
# Use `coalesce` to set the sequence for each model to the max pk value if there are records,
|
||||
# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true
|
||||
# if there are records (as the max pk value is already in use), otherwise set it to false.
|
||||
for f in model._meta.fields:
|
||||
if isinstance(f, models.AutoField):
|
||||
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
|
||||
(style.SQL_KEYWORD('SELECT'),
|
||||
style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))),
|
||||
style.SQL_FIELD(qn(f.column)),
|
||||
style.SQL_FIELD(qn(f.column)),
|
||||
style.SQL_KEYWORD('IS NOT'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_TABLE(qn(model._meta.db_table))))
|
||||
break # Only one AutoField is allowed per model, so don't bother continuing.
|
||||
for f in model._meta.many_to_many:
|
||||
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
|
||||
(style.SQL_KEYWORD('SELECT'),
|
||||
style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())),
|
||||
style.SQL_FIELD(qn('id')),
|
||||
style.SQL_FIELD(qn('id')),
|
||||
style.SQL_KEYWORD('IS NOT'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_TABLE(f.m2m_db_table())))
|
||||
return output
|
||||
|
|
@ -4,7 +4,8 @@ PostgreSQL database backend for Django.
|
|||
Requires psycopg 2: http://initd.org/projects/psycopg2
|
||||
"""
|
||||
|
||||
from django.db.backends import BaseDatabaseWrapper, BaseDatabaseOperations, util
|
||||
from django.db.backends import BaseDatabaseWrapper, util
|
||||
from django.db.backends.postgresql.operations import DatabaseOperations
|
||||
try:
|
||||
import psycopg2 as Database
|
||||
import psycopg2.extensions
|
||||
|
|
@ -17,111 +18,6 @@ IntegrityError = Database.IntegrityError
|
|||
|
||||
psycopg2.extensions.register_type(psycopg2.extensions.UNICODE)
|
||||
|
||||
postgres_version = None
|
||||
|
||||
class DatabaseOperations(BaseDatabaseOperations):
|
||||
def date_extract_sql(self, lookup_type, field_name):
|
||||
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
|
||||
return "EXTRACT('%s' FROM %s)" % (lookup_type, field_name)
|
||||
|
||||
def date_trunc_sql(self, lookup_type, field_name):
|
||||
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
|
||||
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
|
||||
|
||||
def deferrable_sql(self):
|
||||
return " DEFERRABLE INITIALLY DEFERRED"
|
||||
|
||||
def last_insert_id(self, cursor, table_name, pk_name):
|
||||
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
|
||||
return cursor.fetchone()[0]
|
||||
|
||||
def quote_name(self, name):
|
||||
if name.startswith('"') and name.endswith('"'):
|
||||
return name # Quoting once is enough.
|
||||
return '"%s"' % name
|
||||
|
||||
def sql_flush(self, style, tables, sequences):
|
||||
qn = self.quote_name
|
||||
if tables:
|
||||
if postgres_version[0] >= 8 and postgres_version[1] >= 1:
|
||||
# Postgres 8.1+ can do 'TRUNCATE x, y, z...;'. In fact, it *has to*
|
||||
# in order to be able to truncate tables referenced by a foreign
|
||||
# key in any other table. The result is a single SQL TRUNCATE
|
||||
# statement.
|
||||
sql = ['%s %s;' % \
|
||||
(style.SQL_KEYWORD('TRUNCATE'),
|
||||
style.SQL_FIELD(', '.join([qn(table) for table in tables]))
|
||||
)]
|
||||
else:
|
||||
# Older versions of Postgres can't do TRUNCATE in a single call, so
|
||||
# they must use a simple delete.
|
||||
sql = ['%s %s %s;' % \
|
||||
(style.SQL_KEYWORD('DELETE'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_FIELD(qn(table))
|
||||
) for table in tables]
|
||||
|
||||
# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements
|
||||
# to reset sequence indices
|
||||
for sequence_info in sequences:
|
||||
table_name = sequence_info['table']
|
||||
column_name = sequence_info['column']
|
||||
if column_name and len(column_name)>0:
|
||||
# sequence name in this case will be <table>_<column>_seq
|
||||
sql.append("%s %s %s %s %s %s;" % \
|
||||
(style.SQL_KEYWORD('ALTER'),
|
||||
style.SQL_KEYWORD('SEQUENCE'),
|
||||
style.SQL_FIELD(qn('%s_%s_seq' % (table_name, column_name))),
|
||||
style.SQL_KEYWORD('RESTART'),
|
||||
style.SQL_KEYWORD('WITH'),
|
||||
style.SQL_FIELD('1')
|
||||
)
|
||||
)
|
||||
else:
|
||||
# sequence name in this case will be <table>_id_seq
|
||||
sql.append("%s %s %s %s %s %s;" % \
|
||||
(style.SQL_KEYWORD('ALTER'),
|
||||
style.SQL_KEYWORD('SEQUENCE'),
|
||||
style.SQL_FIELD(qn('%s_id_seq' % table_name)),
|
||||
style.SQL_KEYWORD('RESTART'),
|
||||
style.SQL_KEYWORD('WITH'),
|
||||
style.SQL_FIELD('1')
|
||||
)
|
||||
)
|
||||
return sql
|
||||
else:
|
||||
return []
|
||||
|
||||
def sequence_reset_sql(self, style, model_list):
|
||||
from django.db import models
|
||||
qn = self.quote_name
|
||||
output = []
|
||||
for model in model_list:
|
||||
# Use `coalesce` to set the sequence for each model to the max pk value if there are records,
|
||||
# or 1 if there are none. Set the `is_called` property (the third argument to `setval`) to true
|
||||
# if there are records (as the max pk value is already in use), otherwise set it to false.
|
||||
for f in model._meta.fields:
|
||||
if isinstance(f, models.AutoField):
|
||||
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
|
||||
(style.SQL_KEYWORD('SELECT'),
|
||||
style.SQL_FIELD(qn('%s_%s_seq' % (model._meta.db_table, f.column))),
|
||||
style.SQL_FIELD(qn(f.column)),
|
||||
style.SQL_FIELD(qn(f.column)),
|
||||
style.SQL_KEYWORD('IS NOT'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_TABLE(qn(model._meta.db_table))))
|
||||
break # Only one AutoField is allowed per model, so don't bother continuing.
|
||||
for f in model._meta.many_to_many:
|
||||
output.append("%s setval('%s', coalesce(max(%s), 1), max(%s) %s null) %s %s;" % \
|
||||
(style.SQL_KEYWORD('SELECT'),
|
||||
style.SQL_FIELD(qn('%s_id_seq' % f.m2m_db_table())),
|
||||
style.SQL_FIELD(qn('id')),
|
||||
style.SQL_FIELD(qn('id')),
|
||||
style.SQL_KEYWORD('IS NOT'),
|
||||
style.SQL_KEYWORD('FROM'),
|
||||
style.SQL_TABLE(f.m2m_db_table())))
|
||||
return output
|
||||
|
||||
class DatabaseWrapper(BaseDatabaseWrapper):
|
||||
ops = DatabaseOperations()
|
||||
|
||||
|
|
@ -148,10 +44,9 @@ class DatabaseWrapper(BaseDatabaseWrapper):
|
|||
cursor.tzinfo_factory = None
|
||||
if set_tz:
|
||||
cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
|
||||
global postgres_version
|
||||
if not postgres_version:
|
||||
if self.ops.postgres_version is None:
|
||||
cursor.execute("SELECT version()")
|
||||
postgres_version = [int(val) for val in cursor.fetchone()[0].split()[1].split('.')]
|
||||
self.ops.postgres_version = [int(val) for val in cursor.fetchone()[0].split()[1].split('.')]
|
||||
return cursor
|
||||
|
||||
allows_group_by_ordinal = True
|
||||
|
|
|
|||
Loading…
Reference in New Issue