125 lines
3.9 KiB
Python
125 lines
3.9 KiB
Python
"""
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PostgreSQL database backend for Django.
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Requires psycopg 2: http://initd.org/projects/psycopg2
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"""
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from django.db.backends import util
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try:
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import psycopg2 as Database
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except ImportError, e:
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from django.core.exceptions import ImproperlyConfigured
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raise ImproperlyConfigured, "Error loading psycopg2 module: %s" % e
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DatabaseError = Database.DatabaseError
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try:
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# Only exists in Python 2.4+
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from threading import local
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except ImportError:
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# Import copy of _thread_local.py from Python 2.4
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from django.utils._threading_local import local
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class DatabaseWrapper(local):
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def __init__(self, **kwargs):
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self.connection = None
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self.queries = []
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self.options = kwargs
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def cursor(self):
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from django.conf import settings
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set_tz = False
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if self.connection is None:
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set_tz = True
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if settings.DATABASE_NAME == '':
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from django.core.exceptions import ImproperlyConfigured
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raise ImproperlyConfigured, "You need to specify DATABASE_NAME in your Django settings file."
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conn_string = "dbname=%s" % settings.DATABASE_NAME
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if settings.DATABASE_USER:
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conn_string = "user=%s %s" % (settings.DATABASE_USER, conn_string)
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if settings.DATABASE_PASSWORD:
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conn_string += " password='%s'" % settings.DATABASE_PASSWORD
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if settings.DATABASE_HOST:
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conn_string += " host=%s" % settings.DATABASE_HOST
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if settings.DATABASE_PORT:
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conn_string += " port=%s" % settings.DATABASE_PORT
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self.connection = Database.connect(conn_string, **self.options)
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self.connection.set_isolation_level(1) # make transactions transparent to all cursors
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cursor = self.connection.cursor()
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cursor.tzinfo_factory = None
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if set_tz:
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cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE])
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if settings.DEBUG:
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return util.CursorDebugWrapper(cursor, self)
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return cursor
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def _commit(self):
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return self.connection.commit()
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def _rollback(self):
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if self.connection:
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return self.connection.rollback()
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def close(self):
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if self.connection is not None:
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self.connection.close()
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self.connection = None
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supports_constraints = True
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def quote_name(name):
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if name.startswith('"') and name.endswith('"'):
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return name # Quoting once is enough.
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return '"%s"' % name
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dictfetchone = util.dictfetchone
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dictfetchmany = util.dictfetchmany
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dictfetchall = util.dictfetchall
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def get_last_insert_id(cursor, table_name, pk_name):
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cursor.execute("SELECT CURRVAL('\"%s_%s_seq\"')" % (table_name, pk_name))
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return cursor.fetchone()[0]
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def get_date_extract_sql(lookup_type, table_name):
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# lookup_type is 'year', 'month', 'day'
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# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-EXTRACT
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return "EXTRACT('%s' FROM %s)" % (lookup_type, table_name)
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def get_date_trunc_sql(lookup_type, field_name):
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# lookup_type is 'year', 'month', 'day'
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# http://www.postgresql.org/docs/8.0/static/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC
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return "DATE_TRUNC('%s', %s)" % (lookup_type, field_name)
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def get_limit_offset_sql(limit, offset=None):
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sql = "LIMIT %s" % limit
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if offset and offset != 0:
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sql += " OFFSET %s" % offset
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return sql
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def get_random_function_sql():
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return "RANDOM()"
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def get_fulltext_search_sql(field_name):
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raise NotImplementedError
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def get_drop_foreignkey_sql():
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return "DROP CONSTRAINT"
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def get_pk_default_value():
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return "DEFAULT"
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OPERATOR_MAPPING = {
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'exact': '= %s',
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'iexact': 'ILIKE %s',
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'contains': 'LIKE %s',
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'icontains': 'ILIKE %s',
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'gt': '> %s',
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'gte': '>= %s',
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'lt': '< %s',
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'lte': '<= %s',
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'startswith': 'LIKE %s',
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'endswith': 'LIKE %s',
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'istartswith': 'ILIKE %s',
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'iendswith': 'ILIKE %s',
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}
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