I want to run inspectdb against an Oracle database. The user account that I use is a read only user that owns 0 tables. It, however, has access to the schema that contains all the tables. How do I specify a schema when using inspectdb?
My command, currently, is: python manage.py inspectdb --database "oradb" > test_model.py
This only outputs a file with from django.db import models.
César's answer is true regarding Oracle support. However, I was able to generate a rough model by modifying django\db\backends\oracle\introspection.py in two places.
Change the cursor.execute line in get_table_list to read:
cursor.execute("SELECT TABLE_NAME FROM ALL_TABLES WHERE OWNER = 'OTHERSCHEMA'")
Change the user_table_cols to ALL_TAB_COLUMNS in the first cursor.execute line in get_table_description to read:
cursor.execute("""
SELECT
column_name,
data_default,
CASE
WHEN char_used IS NULL THEN data_length
ELSE char_length
END as internal_size
FROM ALL_TAB_COLUMNS
WHERE table_name = UPPER(%s)""", [table_name])
Next, change the second cursor.execute line in get_table_description to read: cursor.execute("SELECT * FROM OTHERSCHEMA.%s WHERE ROWNUM < 2" % self.connection.ops.quote_name(table_name))
Since this is a legacy database where policy prevents changes to the database, this was good for a one time run.
A few more changes are needed once the model is complete. It appears a few of my classes are missing primary key references and foreign key references. I will add these manually.
The last change I made was to modify all of the class Meta: instances to reference the correct schema:
class Meta:
db_table = u'"SCHEMA"."TABLE_NAME"' # Notice the quoting needed
The problem is that Django's inspectdb doesn't support Oracle. From the docs:
inspectdb works with PostgreSQL, MySQL and SQLite. Foreign-key detection only works in PostgreSQL and with certain types of MySQL tables.
The --database option may be used to specify the database to introspect.
Just if someone comes upon this thread: Andy's suggestions + I've also changed the get_relations method to get foreign keys in the generated source, works in 1.9.1:
def get_relations(self, cursor, table_name):
"""
Returns a dictionary of {field_name: (field_name_other_table, other_table)}
representing all relationships to the given table.
"""
table_name = table_name.upper()
cursor.execute("""
SELECT a.column_name, c_pk.table_name r_table_name, c_pk.constraint_name r_pk
FROM all_cons_columns a
JOIN all_constraints c ON a.owner = c.owner
AND a.constraint_name = c.constraint_name
JOIN all_constraints c_pk ON c.r_owner = c_pk.owner
AND c.r_constraint_name = c_pk.constraint_name
WHERE c.constraint_type = 'R'
AND a.table_name = %s""", [table_name])
relations = {}
for row in cursor.fetchall():
relations[row[0].lower()] = (row[2].lower(), row[1].lower())
return relations
My two cents in. (django version 1.9.7 + django GIS extension)
Following Andy and Mirek Simek suggestions I further modified:
added 'schemas' in your db config in settings.py
...
'oracle1': {
'ENGINE': 'django.contrib.gis.db.backends.oracle',
'NAME': 'dbname',
'USER': 'dbuser',
'PASSWORD': 'dbpass',
'HOST': 'dbhostname',
'PORT': 'dbport',
'schemas': ['SCHEMANAME1', ....] #<-- this
},
...
modified get_tables_list in this way:
def get_table_list(self, cursor):
"""
Returns a list of table and view names in the current database.
"""
cursor.execute("SELECT TABLE_NAME, 't' FROM USER_TABLES UNION ALL "
"SELECT VIEW_NAME, 'v' FROM USER_VIEWS")
res = [TableInfo(row[0].lower(), row[1]) for row in cursor.fetchall()]
schemas = self.connection.settings_dict.get('schemas')
if schemas and len(schemas)>0:
for s in schemas:
cursor.execute("SELECT TABLE_NAME, 't' FROM ALL_TABLES WHERE OWNER = '%s'" %s)
for row in cursor.fetchall():
tbl_name, typ = '.'.join([s,row[0].lower()]), row[1]
try:
# let us check for permission to query
cursor.execute("SELECT * FROM %s WHERE ROWNUM < 1" % tbl_name.upper())
except DatabaseError, e:
pass
else:
res.append(TableInfo(tbl_name, typ))
return res
Cause I'm using gis I had to make a dirty patch (I don't know if it is needed due to database issue) to django/contrib/gis/db/backends/oracle/introspection.py
just added this at the end of get_geometry_type
...
dim = len(dim)
if dim != 2:
field_params['dim'] = dim
except: # <-- this
pass # <-- this
finally:
cursor.close()
...
Try to specify the search_path, by adding an option in your DATABASES variable at settings.py, like that:
'OPTIONS': {
'options': '-c search_path=myschema'
}
The full DATABASES variable should be:
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': 'mydatabase',
'USER': 'postgres',
'PASSWORD': 'mypassword',
'HOST': 'localhost',
'PORT': '5432',
'OPTIONS': {
'options': '-c search_path=myschema'
}
}
}
After that python migrate inspectdb should work on your schema
