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Added first stab at 'django-admin.py inspectdb', which takes a database name and introspects the tables, outputting a Django model. Works in PostgreSQL and MySQL. It's missing some niceties at the moment, such as detection of primary-keys and relationships, but it works. Refs #90. 

git-svn-id: http://code.djangoproject.com/svn/django/trunk@384 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty 2005-08-02 17:08:24 +00:00
parent 1510ca1a80
commit d9401b78f1
6 changed files with 104 additions and 7 deletions
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12
django/bin/django-admin.py
View File

@ -7,6 +7,7 @@ ACTION_MAPPING = {
'adminindex': management.get_admin_index,
'createsuperuser': management.createsuperuser,
# 'dbcheck': management.database_check,
'inspectdb': management.inspectdb,
'runserver': management.runserver,
'sql': management.get_sql_create,
'sqlall': management.get_sql_all,
@ -66,6 +67,17 @@ def main():
print_error("Your action, %r, was invalid." % action, sys.argv[0])
if action in ('createsuperuser', 'init'):
ACTION_MAPPING[action]()
elif action == 'inspectdb':
try:
param = args[1]
except IndexError:
parser.print_usage_and_exit()
try:
for line in ACTION_MAPPING[action](param):
print line
except NotImplementedError:
sys.stderr.write("Error: %r isn't supported for the currently selected database backend." % action)
sys.exit(1)
elif action in ('startapp', 'startproject'):
try:
name = args[1]

2
django/core/db/__init__.py
View File

@ -37,5 +37,7 @@ dictfetchall = dbmod.dictfetchall
get_last_insert_id = dbmod.get_last_insert_id
get_date_extract_sql = dbmod.get_date_extract_sql
get_date_trunc_sql = dbmod.get_date_trunc_sql
get_table_list = dbmod.get_table_list
OPERATOR_MAPPING = dbmod.OPERATOR_MAPPING
DATA_TYPES = dbmod.DATA_TYPES
DATA_TYPES_REVERSE = dbmod.DATA_TYPES_REVERSE

25
django/core/db/backends/mysql.py
View File

@ -68,6 +68,11 @@ def get_date_trunc_sql(lookup_type, field_name):
subtractions.append(" - interval (DATE_FORMAT(%s, '%%%%m')-1) month" % field_name)
return "(%s - %s)" % (field_name, ''.join(subtractions))
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()]
OPERATOR_MAPPING = {
'exact': '=',
'iexact': 'LIKE',
@ -115,3 +120,23 @@ DATA_TYPES = {
'USStateField': 'varchar(2)',
'XMLField': 'text',
}
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_BLOB: 'TextField',
FIELD_TYPE.MEDIUM_BLOB: 'TextField',
FIELD_TYPE.LONG_BLOB: 'TextField',
FIELD_TYPE.VAR_STRING: 'CharField',
}

27
django/core/db/backends/postgresql.py
View File

@ -71,6 +71,17 @@ def get_date_trunc_sql(lookup_type, field_name):
# 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_table_list(cursor):
"Returns a list of table names in the current database."
cursor.execute("""
SELECT c.relname
FROM pg_catalog.pg_class c
LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind IN ('r', 'v', '')
AND n.nspname NOT IN ('pg_catalog', 'pg_toast')
AND pg_catalog.pg_table_is_visible(c.oid)""")
return [row[0] for row in cursor.fetchall()]
# Register these custom typecasts, because Django expects dates/times to be
# in Python's native (standard-library) datetime/time format, whereas psycopg
# use mx.DateTime by default.
@ -129,3 +140,19 @@ DATA_TYPES = {
'USStateField': 'varchar(2)',
'XMLField': 'text',
}
# Maps type codes to Django Field types.
DATA_TYPES_REVERSE = {
16: 'BooleanField',
21: 'SmallIntegerField',
23: 'IntegerField',
25: 'TextField',
869: 'IPAddressField',
1043: 'CharField',
1082: 'DateField',
1083: 'TimeField',
1114: 'DateTimeField',
1184: 'DateTimeField',
1266: 'TimeField',
1700: 'FloatField',
}

19
django/core/db/backends/sqlite3.py
View File

@ -61,15 +61,15 @@ class SQLiteCursorWrapper(Database.Cursor):
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[0]))
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)
@ -78,10 +78,10 @@ class SQLiteCursorWrapper(Database.Cursor):
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
# 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)
@ -109,8 +109,11 @@ def _sqlite_date_trunc(lookup_type, dt):
elif lookup_type == 'day':
return "%i-%02i-%02i 00:00:00" % (dt.year, dt.month, dt.day)
def get_table_list(cursor):
raise NotImplementedError
# Operators and fields ########################################################
OPERATOR_MAPPING = {
'exact': '=',
'iexact': 'LIKE',
@ -127,7 +130,7 @@ OPERATOR_MAPPING = {
'iendswith': 'LIKE',
}
# SQLite doesn't actually support most of these types, but it "does the right
# 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 = {
@ -157,3 +160,5 @@ DATA_TYPES = {
'USStateField': 'varchar(2)',
'XMLField': 'text',
}
DATA_TYPES_REVERSE = {}

26
django/core/management.py
View File

@ -430,6 +430,32 @@ def createsuperuser():
print "User created successfully."
createsuperuser.args = ''
def inspectdb(db_name):
"Generator that introspects the tables in the given database name and returns a Django model, one line at a time."
from django.core import db
from django.conf import settings
settings.DATABASE_NAME = db_name
cursor = db.db.cursor()
yield 'from django.core import meta'
yield ''
for table_name in db.get_table_list(cursor):
object_name = table_name.title().replace('_', '')
object_name = object_name.endswith('s') and object_name[:-1] or object_name
yield 'class %s(meta.Model):' % object_name
yield ' db_table = %r' % table_name
yield ' fields = ('
cursor.execute("SELECT * FROM %s LIMIT 1" % table_name)
for row in cursor.description:
field_type = db.DATA_TYPES_REVERSE[row[1]]
field_desc = 'meta.%s(%r' % (field_type, row[0])
if field_type == 'CharField':
field_desc += ', maxlength=%s' % (row[3])
yield ' %s),' % field_desc
yield ' )'
yield ''
inspectdb.help_doc = "Introspects the database tables in the given database and outputs a Django model module."
inspectdb.args = "[dbname]"
def runserver(port):
"Starts a lightweight Web server for development."
from django.core.servers.basehttp import run, WSGIServerException