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"""
PostgreSQL database backend for Django.
Requires psycopg 2: http://initd.org/projects/psycopg2
"""
from django.db.backends import util
try:
import psycopg2 as Database
except ImportError, e:
from django.core.exceptions import ImproperlyConfigured
raise ImproperlyConfigured, "Error loading psycopg2 module: %s" % e
DatabaseError = Database.DatabaseError
IntegrityError = Database.IntegrityError
try:
# Only exists in Python 2.4+
from threading import local
except ImportError:
# Import copy of _thread_local.py from Python 2.4
from django.utils._threading_local import local
postgres_version = None
class DatabaseWrapper(local):
def __init__(self, **kwargs):
self.connection = None
self.queries = []
self.options = kwargs
def cursor(self):
from django.conf import settings
set_tz = False
if self.connection is None:
set_tz = True
if settings.DATABASE_NAME == '':
from django.core.exceptions import ImproperlyConfigured
raise ImproperlyConfigured, "You need to specify DATABASE_NAME in your Django settings file."
conn_string = "dbname=%s" % settings.DATABASE_NAME
if settings.DATABASE_USER:
conn_string = "user=%s %s" % (settings.DATABASE_USER, conn_string)
if settings.DATABASE_PASSWORD:
conn_string += " password='%s'" % settings.DATABASE_PASSWORD
if settings.DATABASE_HOST:
conn_string += " host=%s" % settings.DATABASE_HOST
if settings.DATABASE_PORT:
conn_string += " port=%s" % settings.DATABASE_PORT
self.connection = Database.connect(conn_string, **self.options)
self.connection.set_isolation_level(1) # make transactions transparent to all cursors
cursor = self.connection.cursor()
cursor.tzinfo_factory = None
if set_tz:
cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
global postgres_version
if not postgres_version:
cursor.execute("SELECT version()")
postgres_version = [int(val) for val in cursor.fetchone()[0].split()[1].split('.')]
if settings.DEBUG:
return util.CursorDebugWrapper(cursor, self)
return cursor
def _commit(self):
if self.connection is not None:
return self.connection.commit()
def _rollback(self):
if self.connection is not None:
return self.connection.rollback()
def close(self):
if self.connection is not None:
self.connection.close()
self.connection = None
allows_group_by_ordinal = True
allows_unique_and_pk = True
autoindexes_primary_keys = True
needs_datetime_string_cast = False
needs_upper_for_iops = False
supports_constraints = True
supports_tablespaces = False
uses_case_insensitive_names = True
def quote_name(name):
if name.startswith('"') and name.endswith('"'):
return name # Quoting once is enough.
return '"%s"' % name
dictfetchone = util.dictfetchone
dictfetchmany = util.dictfetchmany
dictfetchall = util.dictfetchall
def get_last_insert_id(cursor, table_name, pk_name):
cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
return cursor.fetchone()[0]
def get_date_extract_sql(lookup_type, table_name):
# lookup_type is 'year', 'month', 'day'
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
return "EXTRACT('%s' FROM %s)" % (lookup_type, table_name)
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
def get_datetime_cast_sql():
return None
def get_limit_offset_sql(limit, offset=None):
sql = "LIMIT %s" % limit
if offset and offset != 0:
sql += " OFFSET %s" % offset
return sql
def get_random_function_sql():
return "RANDOM()"
def get_deferrable_sql():
return " DEFERRABLE INITIALLY DEFERRED"
def get_fulltext_search_sql(field_name):
raise NotImplementedError
def get_drop_foreignkey_sql():
return "DROP CONSTRAINT"
def get_pk_default_value():
return "DEFAULT"
def get_max_name_length():
return None
def get_start_transaction_sql():
return "BEGIN;"
def get_autoinc_sql(table):
return None
def get_sql_flush(style, tables, sequences):
"""Return a list of SQL statements required to remove all data from
all tables in the database (without actually removing the tables
themselves) and put the database in an empty 'initial' state
"""
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([quote_name(table) for table in tables]))
)]
else:
sql = ['%s %s %s;' % \
(style.SQL_KEYWORD('DELETE'),
style.SQL_KEYWORD('FROM'),
style.SQL_FIELD(quote_name(table))
) for table in tables]
# 'ALTER SEQUENCE sequence_name RESTART WITH 1;'... style SQL statements
# to reset sequence indices
for sequence in sequences:
table_name = sequence['table']
column_name = sequence['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(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(quote_name('%s_id_seq' % table_name)),
style.SQL_KEYWORD('RESTART'),
style.SQL_KEYWORD('WITH'),
style.SQL_FIELD('1')
)
)
return sql
else:
return []
def get_sql_sequence_reset(style, model_list):
"Returns a list of the SQL statements to reset sequences for the given models."
from django.db import models
output = []
for model in model_list:
for f in model._meta.fields:
if isinstance(f, models.AutoField):
output.append("%s setval('%s', (%s max(%s) %s %s));" % \
(style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(quote_name('%s_%s_seq' % (model._meta.db_table, f.column))),
style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(quote_name(f.column)),
style.SQL_KEYWORD('FROM'),
style.SQL_TABLE(quote_name(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', (%s max(%s) %s %s));" % \
(style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(quote_name('%s_id_seq' % f.m2m_db_table())),
style.SQL_KEYWORD('SELECT'),
style.SQL_FIELD(quote_name('id')),
style.SQL_KEYWORD('FROM'),
style.SQL_TABLE(f.m2m_db_table())))
return output
OPERATOR_MAPPING = {
'exact': '= %s',
'iexact': 'ILIKE %s',
'contains': 'LIKE %s',
'icontains': 'ILIKE %s',
'gt': '> %s',
'gte': '>= %s',
'lt': '< %s',
'lte': '<= %s',
'startswith': 'LIKE %s',
'endswith': 'LIKE %s',
'istartswith': 'ILIKE %s',
'iendswith': 'ILIKE %s',
}
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