author | Lennard de Rijk <ljvderijk@gmail.com> |
Mon, 26 Jan 2009 16:11:50 +0000 | |
changeset 1001 | 2faa7f80e8b2 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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PostgreSQL database backend for Django. |
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|
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Requires psycopg 1: http://initd.org/projects/psycopg1 |
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""" |
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from django.db.backends import * |
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from django.db.backends.postgresql.client import DatabaseClient |
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from django.db.backends.postgresql.creation import DatabaseCreation |
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from django.db.backends.postgresql.introspection import DatabaseIntrospection |
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from django.db.backends.postgresql.operations import DatabaseOperations |
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from django.db.backends.postgresql.version import get_version |
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from django.utils.encoding import smart_str, smart_unicode |
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try: |
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import psycopg 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 psycopg module: %s" % e) |
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|
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DatabaseError = Database.DatabaseError |
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IntegrityError = Database.IntegrityError |
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|
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class UnicodeCursorWrapper(object): |
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""" |
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A thin wrapper around psycopg cursors that allows them to accept Unicode |
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strings as params. |
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|
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This is necessary because psycopg doesn't apply any DB quoting to |
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parameters that are Unicode strings. If a param is Unicode, this will |
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convert it to a bytestring using database client's encoding before passing |
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it to psycopg. |
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|
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All results retrieved from the database are converted into Unicode strings |
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before being returned to the caller. |
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""" |
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def __init__(self, cursor, charset): |
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self.cursor = cursor |
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self.charset = charset |
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def format_params(self, params): |
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if isinstance(params, dict): |
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result = {} |
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charset = self.charset |
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for key, value in params.items(): |
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result[smart_str(key, charset)] = smart_str(value, charset) |
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return result |
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else: |
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return tuple([smart_str(p, self.charset, True) for p in params]) |
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|
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def execute(self, sql, params=()): |
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return self.cursor.execute(smart_str(sql, self.charset), self.format_params(params)) |
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def executemany(self, sql, param_list): |
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new_param_list = [self.format_params(params) for params in param_list] |
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return self.cursor.executemany(sql, new_param_list) |
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def __getattr__(self, attr): |
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if attr in self.__dict__: |
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return self.__dict__[attr] |
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else: |
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return getattr(self.cursor, attr) |
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def __iter__(self): |
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return iter(self.cursor) |
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class DatabaseFeatures(BaseDatabaseFeatures): |
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uses_savepoints = True |
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class DatabaseWrapper(BaseDatabaseWrapper): |
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operators = { |
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'exact': '= %s', |
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'iexact': '= UPPER(%s)', |
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'contains': 'LIKE %s', |
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'icontains': 'LIKE UPPER(%s)', |
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'regex': '~ %s', |
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'iregex': '~* %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': 'LIKE UPPER(%s)', |
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'iendswith': 'LIKE UPPER(%s)', |
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} |
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def __init__(self, *args, **kwargs): |
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super(DatabaseWrapper, self).__init__(*args, **kwargs) |
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self.features = DatabaseFeatures() |
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self.ops = DatabaseOperations() |
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self.client = DatabaseClient() |
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self.creation = DatabaseCreation(self) |
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self.introspection = DatabaseIntrospection(self) |
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self.validation = BaseDatabaseValidation() |
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def _cursor(self, 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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112 |
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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if set_tz: |
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cursor.execute("SET TIME ZONE %s", [settings.TIME_ZONE]) |
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if not hasattr(self, '_version'): |
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self.__class__._version = get_version(cursor) |
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if self._version < (8, 0): |
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# No savepoint support for earlier version of PostgreSQL. |
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self.features.uses_savepoints = False |
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cursor.execute("SET client_encoding to 'UNICODE'") |
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cursor = UnicodeCursorWrapper(cursor, 'utf-8') |
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return cursor |
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127 |
|
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128 |
def typecast_string(s): |
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129 |
""" |
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Cast all returned strings to unicode strings. |
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""" |
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if not s and not isinstance(s, str): |
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133 |
return s |
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return smart_unicode(s) |
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135 |
|
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# Register these custom typecasts, because Django expects dates/times to be |
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# in Python's native (standard-library) datetime/time format, whereas psycopg |
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# use mx.DateTime by default. |
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try: |
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Database.register_type(Database.new_type((1082,), "DATE", util.typecast_date)) |
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141 |
except AttributeError: |
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raise Exception("You appear to be using psycopg version 2. Set your DATABASE_ENGINE to 'postgresql_psycopg2' instead of 'postgresql'.") |
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Database.register_type(Database.new_type((1083,1266), "TIME", util.typecast_time)) |
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144 |
Database.register_type(Database.new_type((1114,1184), "TIMESTAMP", util.typecast_timestamp)) |
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Database.register_type(Database.new_type((16,), "BOOLEAN", util.typecast_boolean)) |
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Database.register_type(Database.new_type((1700,), "NUMERIC", util.typecast_decimal)) |
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147 |
Database.register_type(Database.new_type(Database.types[1043].values, 'STRING', typecast_string)) |