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Code Issues 25 Releases Wiki Activity

Added sqlite3 database backend -- somewhat tested, but probably not 100% perfect.

Browse Source 
git-svn-id: http://code.djangoproject.com/svn/django/trunk@288 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Jacob Kaplan-Moss 2005-07-22 03:15:43 +00:00
parent dbfb35b542
commit e320a0936e
4 changed files with 202 additions and 41 deletions
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10
django/conf/project_template/settings/main.py
View File

@ -10,11 +10,11 @@ MANAGERS = ADMINS
LANGUAGE_CODE = 'en-us'
DATABASE_ENGINE = 'postgresql' # 'postgresql' or 'mysql'
DATABASE_NAME = ''
DATABASE_USER = ''
DATABASE_PASSWORD = ''
DATABASE_HOST = '' # Set to empty string for localhost
DATABASE_ENGINE = 'postgresql' # 'postgresql', 'mysql', or 'sqlite'
DATABASE_NAME = '' # or path to database file if using sqlite
DATABASE_USER = '' # not used with sqlite
DATABASE_PASSWORD = '' # not used with sqlite
DATABASE_HOST = '' # Set to empty string for localhost; not used with sqlite
SITE_ID = 1

148
django/core/db/backends/sqlite3.py Normal file
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@ -0,0 +1,148 @@
"""
SQLite3 backend for django. Requires pysqlite2 (http://pysqlite.org/).
"""
from django.core.db import base, typecasts
from django.core.db.dicthelpers import *
from pysqlite2 import dbapi2 as Database
DatabaseError = Database.DatabaseError
# Register adaptors ###########################################################
Database.register_converter("bool", lambda s: str(s) == '1')
Database.register_converter("time", typecasts.typecast_time)
Database.register_converter("date", typecasts.typecast_date)
Database.register_converter("datetime", typecasts.typecast_timestamp)
# Database wrapper ############################################################
class DatabaseWrapper:
def __init__(self):
self.connection = None
self.queries = []
def cursor(self):
from django.conf.settings import DATABASE_NAME, DEBUG
if self.connection is None:
self.connection = Database.connect(DATABASE_NAME, detect_types=Database.PARSE_DECLTYPES)
# register extract and date_trun functions
self.connection.create_function("django_extract", 2, _sqlite_extract)
self.connection.create_function("django_date_trunc", 2, _sqlite_date_trunc)
if DEBUG:
return base.CursorDebugWrapper(FormatStylePlaceholderCursor(self.connection), self)
return FormatStylePlaceholderCursor(self.connection)
def commit(self):
self.connection.commit()
def rollback(self):
if self.connection:
self.connection.rollback()
def close(self):
if self.connection is not None:
self.connection.close()
self.connection = None
class FormatStylePlaceholderCursor(Database.Cursor):
"""
Django uses "format" style placeholders, but pysqlite2 uses "qmark" style.
This fixes it -- but note that if you want to use a literal "%s" in a query,
you'll need to use "%%s" (which I belive is true of other wrappers as well).
"""
def execute(self, query, params=[]):
query = self.convert_query(query, len(params))
return Database.Cursor.execute(self, query, params)
def executemany(self, query, params=[]):
query = self.convert_query(query, len(params))
return Database.Cursor.executemany(self, query, params)
def convert_query(self, query, num_params):
# XXX this seems too simple to be correct... is this right?
return query % tuple("?" * num_params)
# Helper functions ############################################################
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'
# sqlite doesn't support extract, so we fake it with the user-defined
# function _sqlite_extract that's registered in connect(), above.
return 'django_extract("%s", %s)' % (lookup_type.lower(), table_name)
def _sqlite_extract(lookup_type, dt):
try:
dt = typecasts.typecast_timestamp(dt)
except (ValueError, TypeError):
return None
return str(getattr(dt, lookup_type))
def get_date_trunc_sql(lookup_type, field_name):
# lookup_type is 'year', 'month', 'day'
# sqlite doesn't support DATE_TRUNC, so we fake it as above.
return 'django_date_trunc("%s", %s)' % (lookup_type.lower(), field_name)
def _sqlite_date_trunc(lookup_type, dt):
try:
dt = typecasts.typecast_timestamp(dt)
except (ValueError, TypeError):
return None
if lookup_type == 'year':
return "%i-01-01 00:00:00" % dt.year
elif lookup_type == 'month':
return "%i-%02i-01 00:00:00" % (dt.year, dt.month)
elif lookup_type == 'day':
return "%i-%02i-%02i 00:00:00" % (dt.year, dt.month, dt.day)
# Operators and fields ########################################################
OPERATOR_MAPPING = {
'exact': '=',
'iexact': 'LIKE',
'contains': 'LIKE',
'icontains': 'LIKE',
'ne': '!=',
'gt': '>',
'gte': '>=',
'lt': '<',
'lte': '<=',
'startswith': 'LIKE',
'endswith': 'LIKE',
'istartswith': 'LIKE',
'iendswith': 'LIKE',
}
# SQLite doesn't actually support most of these types, but it "does the right
# thing" given more verbose field definitions, so leave them as is so that
# schema inspection is more useful.
DATA_TYPES = {
'AutoField': 'integer',
'BooleanField': 'bool',
'CharField': 'varchar(%(maxlength)s)',
'CommaSeparatedIntegerField': 'varchar(%(maxlength)s)',
'DateField': 'date',
'DateTimeField': 'datetime',
'EmailField': 'varchar(75)',
'FileField': '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(50)',
'SmallIntegerField': 'smallint',
'TextField': 'text',
'TimeField': 'time',
'URLField': 'varchar(200)',
'USStateField': 'varchar(2)',
'XMLField': 'text',
}

5
docs/faq.txt
View File

@ -144,8 +144,8 @@ own lightweight development server. For a production environment, we recommend
`Apache 2`_ and mod_python_, although Django follows the WSGI_ spec, which
means it can run on a variety of server platforms.
You'll also need a database engine. PostgreSQL_ is recommended, and MySQL_ is
supported.
You'll also need a database engine. PostgreSQL_ is recommended, and MySQL_
and `SQLite 3`_ are supported.
.. _Python: http://www.python.org/
.. _Apache 2: http://httpd.apache.org/
@ -153,6 +153,7 @@ supported.
.. _WSGI: http://www.python.org/peps/pep-0333.html
.. _PostgreSQL: http://www.postgresql.org/
.. _MySQL: http://www.mysql.com/
.. _`SQLite 3`: http://www.sqlite.org/
Do I have to use mod_python?
----------------------------

80
docs/tutorial01.txt
View File

@ -50,22 +50,26 @@ First, edit ``myproject/settings/main.py``. It's a normal Python module with
module-level variables representing Django settings. Edit the file and change
these settings to match your database's connection parameters:
* ``DATABASE_ENGINE`` -- Either 'postgresql' or 'mysql'. More coming soon.
* ``DATABASE_NAME`` -- The name of your database.
* ``DATABASE_USER`` -- Your database username.
* ``DATABASE_PASSWORD`` -- Your database password.
* ``DATABASE_HOST`` -- The host your database is on. Leave this as an
empty string if your database server is on the same physical machine
(localhost).
* ``DATABASE_ENGINE`` -- Either 'postgresql', 'mysql' or 'sqlite3'.
More coming soon.
* ``DATABASE_NAME`` -- The name of your database, or the full path to
the database file if using sqlite.
* ``DATABASE_USER`` -- Your database username (not used for sqlite).
* ``DATABASE_PASSWORD`` -- Your database password (not used for sqlite).
* ``DATABASE_HOST`` -- The host your database is on. Leave this as an
empty string if your database server is on the same physical machine
(not used for sqlite).
(Make sure you've created a database within PostgreSQL or MySQL by this point.
Do that with "``CREATE DATABASE database_name;``" within your database's
interactive prompt.)
.. admonition:: Note
Also, note that MySQL support is a recent development, and Django hasn't been
comprehensively tested with that database. If you find any bugs in Django's
MySQL bindings, please file them in `Django's ticket system`_ so we can fix them
immediately.
Make sure you've created a database within PostgreSQL or MySQL by this
point. Do that with "``CREATE DATABASE database_name;``" within your
database's interactive prompt.
Also, note that MySQL and sqlite support is a recent development, and Django
hasn't been comprehensively tested with either database. If you find any
bugs in those bindings, please file them in `Django's ticket system`_ so we
can fix them immediately.
Now, take a second to make sure ``myproject`` is on your Python path. You
can do this by copying ``myproject`` to Python's ``site-packages`` directory,
@ -90,8 +94,9 @@ On Windows, you'd use ``set`` instead::
If you don't see any errors after running ``django-admin.py init``, you know it
worked. That command initialized your database with Django's core database
tables. If you're interested, run the PostgreSQL or MySQL command-line client
and type "\\dt" (PostgreSQL) or "SHOW TABLES;" (MySQL) to display the tables.
tables. If you're interested, run the command-line client for your database and
type ``\\dt`` (PostgreSQL), ``SHOW TABLES;`` (MySQL), or ``.schema`` (SQLite) to
display the tables.
Now you're set to start doing work. You won't have to take care of this boring
administrative stuff again.
@ -235,27 +240,34 @@ You should see the following (the CREATE TABLE SQL statements for the polls app)
Note the following:
* Table names are automatically generated by combining the name of the app
(polls) with a plural version of the object name (polls and choices). (You
can override this behavior.)
* Primary keys (IDs) are added automatically. (You can override this, too.)
* The foreign key relationship is made explicit by a ``REFERENCES`` statement.
* It's tailored to the database you're using, so database-specific field types
such as ``auto_increment`` (MySQL) vs. ``serial`` (PostgreSQL) are handled
for you automatically. The author of this tutorial runs PostgreSQL, so the
example output is in PostgreSQL syntax.
* Table names are automatically generated by combining the name of the app
(polls) with a plural version of the object name (polls and choices). (You
can override this behavior.)
* Primary keys (IDs) are added automatically. (You can override this, too.)
* The foreign key relationship is made explicit by a ``REFERENCES`` statement.
* It's tailored to the database you're using, so database-specific field types
such as ``auto_increment`` (MySQL), ``serial`` (PostgreSQL), or ``integer
primary key`` (SQLite) are handled for you automatically. The author of
this tutorial runs PostgreSQL, so the example output is in PostgreSQL
syntax.
If you're interested, also run the following commands:
* ``django-admin.py sqlinitialdata polls`` -- Outputs the initial-data inserts
required for Django's admin framework.
* ``django-admin.py sqlclear polls`` -- Outputs the necessary ``DROP TABLE``
statements for this app, according to which tables already exist in your
database (if any).
* ``django-admin.py sqlindexes polls`` -- Outputs the ``CREATE INDEX``
statements for this app.
* ``django-admin.py sqlall polls`` -- A combination of 'sql' and
'sqlinitialdata'.
* ``django-admin.py sqlinitialdata polls`` -- Outputs the initial-data
inserts required for Django's admin framework.
* ``django-admin.py sqlclear polls`` -- Outputs the necessary ``DROP
TABLE`` statements for this app, according to which tables already exist
in your database (if any).
* ``django-admin.py sqlindexes polls`` -- Outputs the ``CREATE INDEX``
statements for this app.
* ``django-admin.py sqlall polls`` -- A combination of 'sql' and
'sqlinitialdata'.
Looking at the output of those commands can help you understand what's actually
happening under the hood.