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Added a mysql_old backend that matches the mysql backend prior to [47…

…24]. This

is only for backwards compatibility purposes.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@4767 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit dcc8442390f3ebb7130ec8e6fd235855f2510203 1 parent f708bd6
Malcolm Tredinnick malcolmt authored
0  django/db/backends/mysql_old/__init__.py
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233 django/db/backends/mysql_old/base.py
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@@ -0,0 +1,233 @@
+"""
+MySQL database backend for Django.
+
+Requires MySQLdb: http://sourceforge.net/projects/mysql-python
+"""
+
+from django.db.backends import util
+try:
+ import MySQLdb as Database
+except ImportError, e:
+ from django.core.exceptions import ImproperlyConfigured
+ raise ImproperlyConfigured, "Error loading MySQLdb module: %s" % e
+from MySQLdb.converters import conversions
+from MySQLdb.constants import FIELD_TYPE
+import types
+import re
+
+DatabaseError = Database.DatabaseError
+
+django_conversions = conversions.copy()
+django_conversions.update({
+ types.BooleanType: util.rev_typecast_boolean,
+ FIELD_TYPE.DATETIME: util.typecast_timestamp,
+ FIELD_TYPE.DATE: util.typecast_date,
+ FIELD_TYPE.TIME: util.typecast_time,
+})
+
+# This should match the numerical portion of the version numbers (we can treat
+# versions like 5.0.24 and 5.0.24a as the same). Based on the list of version
+# at http://dev.mysql.com/doc/refman/4.1/en/news.html and
+# http://dev.mysql.com/doc/refman/5.0/en/news.html .
+server_version_re = re.compile(r'(\d{1,2})\.(\d{1,2})\.(\d{1,2})')
+
+# This is an extra debug layer over MySQL queries, to display warnings.
+# It's only used when DEBUG=True.
+class MysqlDebugWrapper:
+ def __init__(self, cursor):
+ self.cursor = cursor
+
+ def execute(self, sql, params=()):
+ try:
+ return self.cursor.execute(sql, params)
+ except Database.Warning, w:
+ self.cursor.execute("SHOW WARNINGS")
+ raise Database.Warning, "%s: %s" % (w, self.cursor.fetchall())
+
+ def executemany(self, sql, param_list):
+ try:
+ return self.cursor.executemany(sql, param_list)
+ except Database.Warning, w:
+ self.cursor.execute("SHOW WARNINGS")
+ raise Database.Warning, "%s: %s" % (w, self.cursor.fetchall())
+
+ def __getattr__(self, attr):
+ if self.__dict__.has_key(attr):
+ return self.__dict__[attr]
+ else:
+ return getattr(self.cursor, attr)
+
+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
+
+class DatabaseWrapper(local):
+ def __init__(self, **kwargs):
+ self.connection = None
+ self.queries = []
+ self.server_version = None
+ self.options = kwargs
+
+ def _valid_connection(self):
+ if self.connection is not None:
+ try:
+ self.connection.ping()
+ return True
+ except DatabaseError:
+ self.connection.close()
+ self.connection = None
+ return False
+
+ def cursor(self):
+ from django.conf import settings
+ if not self._valid_connection():
+ kwargs = {
+ 'user': settings.DATABASE_USER,
+ 'db': settings.DATABASE_NAME,
+ 'passwd': settings.DATABASE_PASSWORD,
+ 'conv': django_conversions,
+ }
+ if settings.DATABASE_HOST.startswith('/'):
+ kwargs['unix_socket'] = settings.DATABASE_HOST
+ else:
+ kwargs['host'] = settings.DATABASE_HOST
+ if settings.DATABASE_PORT:
+ kwargs['port'] = int(settings.DATABASE_PORT)
+ kwargs.update(self.options)
+ self.connection = Database.connect(**kwargs)
+ cursor = self.connection.cursor()
+ if self.connection.get_server_info() >= '4.1':
+ cursor.execute("SET NAMES 'utf8'")
+ else:
+ cursor = self.connection.cursor()
+ if settings.DEBUG:
+ return util.CursorDebugWrapper(MysqlDebugWrapper(cursor), self)
+ return cursor
+
+ def _commit(self):
+ if self.connection is not None:
+ self.connection.commit()
+
+ def _rollback(self):
+ if self.connection is not None:
+ try:
+ self.connection.rollback()
+ except Database.NotSupportedError:
+ pass
+
+ def close(self):
+ if self.connection is not None:
+ self.connection.close()
+ self.connection = None
+
+ def get_server_version(self):
+ if not self.server_version:
+ if not self._valid_connection():
+ self.cursor()
+ m = server_version_re.match(self.connection.get_server_info())
+ if not m:
+ raise Exception('Unable to determine MySQL version from version string %r' % self.connection.get_server_info())
+ self.server_version = tuple([int(x) for x in m.groups()])
+ return self.server_version
+
+supports_constraints = 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):
+ return cursor.lastrowid
+
+def get_date_extract_sql(lookup_type, table_name):
+ # lookup_type is 'year', 'month', 'day'
+ # http://dev.mysql.com/doc/mysql/en/date-and-time-functions.html
+ return "EXTRACT(%s FROM %s)" % (lookup_type.upper(), table_name)
+
+def get_date_trunc_sql(lookup_type, field_name):
+ # lookup_type is 'year', 'month', 'day'
+ fields = ['year', 'month', 'day', 'hour', 'minute', 'second']
+ format = ('%%Y-', '%%m', '-%%d', ' %%H:', '%%i', ':%%s') # Use double percents to escape.
+ format_def = ('0000-', '01', '-01', ' 00:', '00', ':00')
+ try:
+ i = fields.index(lookup_type) + 1
+ except ValueError:
+ sql = field_name
+ else:
+ format_str = ''.join([f for f in format[:i]] + [f for f in format_def[i:]])
+ sql = "CAST(DATE_FORMAT(%s, '%s') AS DATETIME)" % (field_name, format_str)
+ return sql
+
+def get_limit_offset_sql(limit, offset=None):
+ sql = "LIMIT "
+ if offset and offset != 0:
+ sql += "%s," % offset
+ return sql + str(limit)
+
+def get_random_function_sql():
+ return "RAND()"
+
+def get_deferrable_sql():
+ return ""
+
+def get_fulltext_search_sql(field_name):
+ return 'MATCH (%s) AGAINST (%%s IN BOOLEAN MODE)' % field_name
+
+def get_drop_foreignkey_sql():
+ return "DROP FOREIGN KEY"
+
+def get_pk_default_value():
+ return "DEFAULT"
+
+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
+
+ """
+ # NB: The generated SQL below is specific to MySQL
+ # 'TRUNCATE x;', 'TRUNCATE y;', 'TRUNCATE z;'... style SQL statements
+ # to clear all tables of all data
+ if tables:
+ sql = ['SET FOREIGN_KEY_CHECKS = 0;'] + \
+ ['%s %s;' % \
+ (style.SQL_KEYWORD('TRUNCATE'),
+ style.SQL_FIELD(quote_name(table))
+ ) for table in tables] + \
+ ['SET FOREIGN_KEY_CHECKS = 1;']
+
+ # 'ALTER TABLE table AUTO_INCREMENT = 1;'... style SQL statements
+ # to reset sequence indices
+ sql.extend(["%s %s %s %s %s;" % \
+ (style.SQL_KEYWORD('ALTER'),
+ style.SQL_KEYWORD('TABLE'),
+ style.SQL_TABLE(quote_name(sequence['table'])),
+ style.SQL_KEYWORD('AUTO_INCREMENT'),
+ style.SQL_FIELD('= 1'),
+ ) for sequence in sequences])
+ return sql
+ else:
+ return []
+
+OPERATOR_MAPPING = {
+ 'exact': '= %s',
+ 'iexact': 'LIKE %s',
+ 'contains': 'LIKE BINARY %s',
+ 'icontains': 'LIKE %s',
+ 'gt': '> %s',
+ 'gte': '>= %s',
+ 'lt': '< %s',
+ 'lte': '<= %s',
+ 'startswith': 'LIKE BINARY %s',
+ 'endswith': 'LIKE BINARY %s',
+ 'istartswith': 'LIKE %s',
+ 'iendswith': 'LIKE %s',
+}
14 django/db/backends/mysql_old/client.py
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@@ -0,0 +1,14 @@
+from django.conf import settings
+import os
+
+def runshell():
+ args = ['']
+ args += ["--user=%s" % settings.DATABASE_USER]
+ if settings.DATABASE_PASSWORD:
+ args += ["--password=%s" % settings.DATABASE_PASSWORD]
+ if settings.DATABASE_HOST:
+ args += ["--host=%s" % settings.DATABASE_HOST]
+ if settings.DATABASE_PORT:
+ args += ["--port=%s" % settings.DATABASE_PORT]
+ args += [settings.DATABASE_NAME]
+ os.execvp('mysql', args)
29 django/db/backends/mysql_old/creation.py
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@@ -0,0 +1,29 @@
+# This dictionary maps Field objects to their associated MySQL column
+# types, as strings. Column-type strings can contain format strings; they'll
+# be interpolated against the values of Field.__dict__ before being output.
+# If a column type is set to None, it won't be included in the output.
+DATA_TYPES = {
+ 'AutoField': 'integer AUTO_INCREMENT',
+ 'BooleanField': 'bool',
+ 'CharField': 'varchar(%(maxlength)s)',
+ 'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',
+ 'DateField': 'date',
+ 'DateTimeField': 'datetime',
+ 'FileField': 'varchar(100)',
+ 'FilePathField': 'varchar(100)',
+ 'FloatField': 'numeric(%(max_digits)s, %(decimal_places)s)',
+ 'ImageField': 'varchar(100)',
+ 'IntegerField': 'integer',
+ 'IPAddressField': 'char(15)',
+ 'ManyToManyField': None,
+ 'NullBooleanField': 'bool',
+ 'OneToOneField': 'integer',
+ 'PhoneNumberField': 'varchar(20)',
+ 'PositiveIntegerField': 'integer UNSIGNED',
+ 'PositiveSmallIntegerField': 'smallint UNSIGNED',
+ 'SlugField': 'varchar(%(maxlength)s)',
+ 'SmallIntegerField': 'smallint',
+ 'TextField': 'longtext',
+ 'TimeField': 'time',
+ 'USStateField': 'varchar(2)',
+}
95 django/db/backends/mysql_old/introspection.py
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@@ -0,0 +1,95 @@
+from django.db.backends.mysql.base import quote_name
+from MySQLdb import ProgrammingError, OperationalError
+from MySQLdb.constants import FIELD_TYPE
+import re
+
+foreign_key_re = re.compile(r"\sCONSTRAINT `[^`]*` FOREIGN KEY \(`([^`]*)`\) REFERENCES `([^`]*)` \(`([^`]*)`\)")
+
+def get_table_list(cursor):
+ "Returns a list of table names in the current database."
+ cursor.execute("SHOW TABLES")
+ return [row[0] for row in cursor.fetchall()]
+
+def get_table_description(cursor, table_name):
+ "Returns a description of the table, with the DB-API cursor.description interface."
+ cursor.execute("SELECT * FROM %s LIMIT 1" % quote_name(table_name))
+ return cursor.description
+
+def _name_to_index(cursor, table_name):
+ """
+ Returns a dictionary of {field_name: field_index} for the given table.
+ Indexes are 0-based.
+ """
+ return dict([(d[0], i) for i, d in enumerate(get_table_description(cursor, table_name))])
+
+def get_relations(cursor, table_name):
+ """
+ Returns a dictionary of {field_index: (field_index_other_table, other_table)}
+ representing all relationships to the given table. Indexes are 0-based.
+ """
+ my_field_dict = _name_to_index(cursor, table_name)
+ constraints = []
+ relations = {}
+ try:
+ # This should work for MySQL 5.0.
+ cursor.execute("""
+ SELECT column_name, referenced_table_name, referenced_column_name
+ FROM information_schema.key_column_usage
+ WHERE table_name = %s
+ AND table_schema = DATABASE()
+ AND referenced_table_name IS NOT NULL
+ AND referenced_column_name IS NOT NULL""", [table_name])
+ constraints.extend(cursor.fetchall())
+ except (ProgrammingError, OperationalError):
+ # Fall back to "SHOW CREATE TABLE", for previous MySQL versions.
+ # Go through all constraints and save the equal matches.
+ cursor.execute("SHOW CREATE TABLE %s" % quote_name(table_name))
+ for row in cursor.fetchall():
+ pos = 0
+ while True:
+ match = foreign_key_re.search(row[1], pos)
+ if match == None:
+ break
+ pos = match.end()
+ constraints.append(match.groups())
+
+ for my_fieldname, other_table, other_field in constraints:
+ other_field_index = _name_to_index(cursor, other_table)[other_field]
+ my_field_index = my_field_dict[my_fieldname]
+ relations[my_field_index] = (other_field_index, other_table)
+
+ return relations
+
+def get_indexes(cursor, table_name):
+ """
+ Returns a dictionary of fieldname -> infodict for the given table,
+ where each infodict is in the format:
+ {'primary_key': boolean representing whether it's the primary key,
+ 'unique': boolean representing whether it's a unique index}
+ """
+ cursor.execute("SHOW INDEX FROM %s" % quote_name(table_name))
+ indexes = {}
+ for row in cursor.fetchall():
+ indexes[row[4]] = {'primary_key': (row[2] == 'PRIMARY'), 'unique': not bool(row[1])}
+ return indexes
+
+DATA_TYPES_REVERSE = {
+ FIELD_TYPE.BLOB: 'TextField',
+ FIELD_TYPE.CHAR: 'CharField',
+ FIELD_TYPE.DECIMAL: 'FloatField',
+ FIELD_TYPE.DATE: 'DateField',
+ FIELD_TYPE.DATETIME: 'DateTimeField',
+ FIELD_TYPE.DOUBLE: 'FloatField',
+ FIELD_TYPE.FLOAT: 'FloatField',
+ FIELD_TYPE.INT24: 'IntegerField',
+ FIELD_TYPE.LONG: 'IntegerField',
+ FIELD_TYPE.LONGLONG: 'IntegerField',
+ FIELD_TYPE.SHORT: 'IntegerField',
+ FIELD_TYPE.STRING: 'TextField',
+ FIELD_TYPE.TIMESTAMP: 'DateTimeField',
+ FIELD_TYPE.TINY: 'IntegerField',
+ FIELD_TYPE.TINY_BLOB: 'TextField',
+ FIELD_TYPE.MEDIUM_BLOB: 'TextField',
+ FIELD_TYPE.LONG_BLOB: 'TextField',
+ FIELD_TYPE.VAR_STRING: 'CharField',
+}
3  docs/settings.txt
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@@ -245,7 +245,8 @@ DATABASE_ENGINE
Default: ``''`` (Empty string)
Which database backend to use. Either ``'postgresql_psycopg2'``,
-``'postgresql'``, ``'mysql'``, ``'sqlite3'`` or ``'ado_mssql'``.
+``'postgresql'``, ``'mysql'``, ``'mysql_old'``, ``'sqlite3'`` or
+``'ado_mssql'``.
DATABASE_HOST
-------------
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