498 lines
22 KiB
Python
498 lines
22 KiB
Python
from django.core.management.base import CommandError
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import os
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import re
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try:
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set
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except NameError:
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from sets import Set as set # Python 2.3 fallback
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def table_names():
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"Returns a list of all table names that exist in the database."
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from django.db import connection, get_introspection_module
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cursor = connection.cursor()
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return set(get_introspection_module().get_table_list(cursor))
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def django_table_names(only_existing=False):
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"""
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Returns a list of all table names that have associated Django models and
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are in INSTALLED_APPS.
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If only_existing is True, the resulting list will only include the tables
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that actually exist in the database.
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"""
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from django.db import models
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tables = set()
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for app in models.get_apps():
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for model in models.get_models(app):
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tables.add(model._meta.db_table)
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tables.update([f.m2m_db_table() for f in model._meta.local_many_to_many])
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if only_existing:
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tables = [t for t in tables if t in table_names()]
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return tables
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def installed_models(table_list):
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"Returns a set of all models that are installed, given a list of existing table names."
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from django.db import connection, models
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all_models = []
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for app in models.get_apps():
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for model in models.get_models(app):
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all_models.append(model)
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if connection.features.uses_case_insensitive_names:
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converter = lambda x: x.upper()
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else:
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converter = lambda x: x
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return set([m for m in all_models if converter(m._meta.db_table) in map(converter, table_list)])
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def sequence_list():
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"Returns a list of information about all DB sequences for all models in all apps."
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from django.db import models
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apps = models.get_apps()
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sequence_list = []
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for app in apps:
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for model in models.get_models(app):
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for f in model._meta.local_fields:
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if isinstance(f, models.AutoField):
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sequence_list.append({'table': model._meta.db_table, 'column': f.column})
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break # Only one AutoField is allowed per model, so don't bother continuing.
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for f in model._meta.local_many_to_many:
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sequence_list.append({'table': f.m2m_db_table(), 'column': None})
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return sequence_list
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def sql_create(app, style):
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"Returns a list of the CREATE TABLE SQL statements for the given app."
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from django.db import models
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from django.conf import settings
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if settings.DATABASE_ENGINE == 'dummy':
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# This must be the "dummy" database backend, which means the user
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# hasn't set DATABASE_ENGINE.
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raise CommandError("Django doesn't know which syntax to use for your SQL statements,\n" +
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"because you haven't specified the DATABASE_ENGINE setting.\n" +
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"Edit your settings file and change DATABASE_ENGINE to something like 'postgresql' or 'mysql'.")
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# Get installed models, so we generate REFERENCES right.
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# We trim models from the current app so that the sqlreset command does not
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# generate invalid SQL (leaving models out of known_models is harmless, so
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# we can be conservative).
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app_models = models.get_models(app)
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final_output = []
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known_models = set([model for model in installed_models(table_names()) if model not in app_models])
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pending_references = {}
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for model in app_models:
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output, references = sql_model_create(model, style, known_models)
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final_output.extend(output)
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for refto, refs in references.items():
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pending_references.setdefault(refto, []).extend(refs)
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if refto in known_models:
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final_output.extend(sql_for_pending_references(refto, style, pending_references))
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final_output.extend(sql_for_pending_references(model, style, pending_references))
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# Keep track of the fact that we've created the table for this model.
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known_models.add(model)
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# Create the many-to-many join tables.
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for model in app_models:
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final_output.extend(many_to_many_sql_for_model(model, style))
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# Handle references to tables that are from other apps
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# but don't exist physically.
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not_installed_models = set(pending_references.keys())
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if not_installed_models:
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alter_sql = []
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for model in not_installed_models:
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alter_sql.extend(['-- ' + sql for sql in
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sql_for_pending_references(model, style, pending_references)])
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if alter_sql:
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final_output.append('-- The following references should be added but depend on non-existent tables:')
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final_output.extend(alter_sql)
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return final_output
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def sql_delete(app, style):
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"Returns a list of the DROP TABLE SQL statements for the given app."
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from django.db import connection, models, get_introspection_module
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from django.db.backends.util import truncate_name
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from django.contrib.contenttypes import generic
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introspection = get_introspection_module()
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# This should work even if a connection isn't available
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try:
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cursor = connection.cursor()
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except:
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cursor = None
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# Figure out which tables already exist
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if cursor:
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table_names = introspection.get_table_list(cursor)
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else:
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table_names = []
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if connection.features.uses_case_insensitive_names:
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table_name_converter = lambda x: x.upper()
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else:
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table_name_converter = lambda x: x
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output = []
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qn = connection.ops.quote_name
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# Output DROP TABLE statements for standard application tables.
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to_delete = set()
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references_to_delete = {}
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app_models = models.get_models(app)
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for model in app_models:
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if cursor and table_name_converter(model._meta.db_table) in table_names:
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# The table exists, so it needs to be dropped
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opts = model._meta
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for f in opts.local_fields:
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if f.rel and f.rel.to not in to_delete:
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references_to_delete.setdefault(f.rel.to, []).append( (model, f) )
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to_delete.add(model)
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for model in app_models:
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if cursor and table_name_converter(model._meta.db_table) in table_names:
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# Drop the table now
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output.append('%s %s;' % (style.SQL_KEYWORD('DROP TABLE'),
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style.SQL_TABLE(qn(model._meta.db_table))))
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if connection.features.supports_constraints and model in references_to_delete:
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for rel_class, f in references_to_delete[model]:
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table = rel_class._meta.db_table
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col = f.column
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r_table = model._meta.db_table
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r_col = model._meta.get_field(f.rel.field_name).column
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r_name = '%s_refs_%s_%x' % (col, r_col, abs(hash((table, r_table))))
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output.append('%s %s %s %s;' % \
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(style.SQL_KEYWORD('ALTER TABLE'),
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style.SQL_TABLE(qn(table)),
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style.SQL_KEYWORD(connection.ops.drop_foreignkey_sql()),
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style.SQL_FIELD(truncate_name(r_name, connection.ops.max_name_length()))))
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del references_to_delete[model]
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if model._meta.has_auto_field:
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ds = connection.ops.drop_sequence_sql(model._meta.db_table)
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if ds:
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output.append(ds)
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# Output DROP TABLE statements for many-to-many tables.
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for model in app_models:
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opts = model._meta
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for f in opts.local_many_to_many:
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if not f.creates_table:
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continue
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if cursor and table_name_converter(f.m2m_db_table()) in table_names:
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output.append("%s %s;" % (style.SQL_KEYWORD('DROP TABLE'),
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style.SQL_TABLE(qn(f.m2m_db_table()))))
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ds = connection.ops.drop_sequence_sql("%s_%s" % (model._meta.db_table, f.column))
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if ds:
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output.append(ds)
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app_label = app_models[0]._meta.app_label
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# Close database connection explicitly, in case this output is being piped
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# directly into a database client, to avoid locking issues.
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if cursor:
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cursor.close()
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connection.close()
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return output[::-1] # Reverse it, to deal with table dependencies.
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def sql_reset(app, style):
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"Returns a list of the DROP TABLE SQL, then the CREATE TABLE SQL, for the given module."
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return sql_delete(app, style) + sql_all(app, style)
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def sql_flush(style, only_django=False):
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"""
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Returns a list of the SQL statements used to flush the database.
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If only_django is True, then only table names that have associated Django
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models and are in INSTALLED_APPS will be included.
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"""
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from django.db import connection
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if only_django:
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tables = django_table_names()
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else:
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tables = table_names()
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statements = connection.ops.sql_flush(style, tables, sequence_list())
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return statements
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def sql_custom(app, style):
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"Returns a list of the custom table modifying SQL statements for the given app."
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from django.db.models import get_models
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output = []
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app_models = get_models(app)
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app_dir = os.path.normpath(os.path.join(os.path.dirname(app.__file__), 'sql'))
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for model in app_models:
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output.extend(custom_sql_for_model(model, style))
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return output
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def sql_indexes(app, style):
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"Returns a list of the CREATE INDEX SQL statements for all models in the given app."
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from django.db import models
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output = []
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for model in models.get_models(app):
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output.extend(sql_indexes_for_model(model, style))
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return output
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def sql_all(app, style):
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"Returns a list of CREATE TABLE SQL, initial-data inserts, and CREATE INDEX SQL for the given module."
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return sql_create(app, style) + sql_custom(app, style) + sql_indexes(app, style)
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def sql_model_create(model, style, known_models=set()):
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"""
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Returns the SQL required to create a single model, as a tuple of:
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(list_of_sql, pending_references_dict)
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"""
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from django.db import connection, models
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opts = model._meta
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final_output = []
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table_output = []
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pending_references = {}
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qn = connection.ops.quote_name
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inline_references = connection.features.inline_fk_references
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for f in opts.local_fields:
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col_type = f.db_type()
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tablespace = f.db_tablespace or opts.db_tablespace
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if col_type is None:
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# Skip ManyToManyFields, because they're not represented as
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# database columns in this table.
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continue
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# Make the definition (e.g. 'foo VARCHAR(30)') for this field.
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field_output = [style.SQL_FIELD(qn(f.column)),
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style.SQL_COLTYPE(col_type)]
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field_output.append(style.SQL_KEYWORD('%sNULL' % (not f.null and 'NOT ' or '')))
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if f.primary_key:
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field_output.append(style.SQL_KEYWORD('PRIMARY KEY'))
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elif f.unique:
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field_output.append(style.SQL_KEYWORD('UNIQUE'))
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if tablespace and connection.features.supports_tablespaces and f.unique:
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# We must specify the index tablespace inline, because we
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# won't be generating a CREATE INDEX statement for this field.
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field_output.append(connection.ops.tablespace_sql(tablespace, inline=True))
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if f.rel:
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if inline_references and f.rel.to in known_models:
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field_output.append(style.SQL_KEYWORD('REFERENCES') + ' ' + \
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style.SQL_TABLE(qn(f.rel.to._meta.db_table)) + ' (' + \
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style.SQL_FIELD(qn(f.rel.to._meta.get_field(f.rel.field_name).column)) + ')' +
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connection.ops.deferrable_sql()
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)
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else:
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# We haven't yet created the table to which this field
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# is related, so save it for later.
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pr = pending_references.setdefault(f.rel.to, []).append((model, f))
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table_output.append(' '.join(field_output))
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if opts.order_with_respect_to:
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table_output.append(style.SQL_FIELD(qn('_order')) + ' ' + \
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style.SQL_COLTYPE(models.IntegerField().db_type()) + ' ' + \
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style.SQL_KEYWORD('NULL'))
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for field_constraints in opts.unique_together:
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table_output.append(style.SQL_KEYWORD('UNIQUE') + ' (%s)' % \
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", ".join([style.SQL_FIELD(qn(opts.get_field(f).column)) for f in field_constraints]))
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full_statement = [style.SQL_KEYWORD('CREATE TABLE') + ' ' + style.SQL_TABLE(qn(opts.db_table)) + ' (']
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for i, line in enumerate(table_output): # Combine and add commas.
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full_statement.append(' %s%s' % (line, i < len(table_output)-1 and ',' or ''))
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full_statement.append(')')
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if opts.db_tablespace and connection.features.supports_tablespaces:
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full_statement.append(connection.ops.tablespace_sql(opts.db_tablespace))
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full_statement.append(';')
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final_output.append('\n'.join(full_statement))
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if opts.has_auto_field:
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# Add any extra SQL needed to support auto-incrementing primary keys.
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auto_column = opts.auto_field.db_column or opts.auto_field.name
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autoinc_sql = connection.ops.autoinc_sql(opts.db_table, auto_column)
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if autoinc_sql:
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for stmt in autoinc_sql:
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final_output.append(stmt)
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return final_output, pending_references
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def sql_for_pending_references(model, style, pending_references):
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"""
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Returns any ALTER TABLE statements to add constraints after the fact.
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"""
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from django.db import connection
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from django.db.backends.util import truncate_name
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qn = connection.ops.quote_name
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final_output = []
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if connection.features.supports_constraints:
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opts = model._meta
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if model in pending_references:
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for rel_class, f in pending_references[model]:
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rel_opts = rel_class._meta
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r_table = rel_opts.db_table
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r_col = f.column
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table = opts.db_table
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col = opts.get_field(f.rel.field_name).column
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# For MySQL, r_name must be unique in the first 64 characters.
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# So we are careful with character usage here.
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r_name = '%s_refs_%s_%x' % (r_col, col, abs(hash((r_table, table))))
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final_output.append(style.SQL_KEYWORD('ALTER TABLE') + ' %s ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s (%s)%s;' % \
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(qn(r_table), truncate_name(r_name, connection.ops.max_name_length()),
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qn(r_col), qn(table), qn(col),
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connection.ops.deferrable_sql()))
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del pending_references[model]
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return final_output
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def many_to_many_sql_for_model(model, style):
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from django.db import connection, models
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from django.contrib.contenttypes import generic
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from django.db.backends.util import truncate_name
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opts = model._meta
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final_output = []
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qn = connection.ops.quote_name
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inline_references = connection.features.inline_fk_references
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for f in opts.local_many_to_many:
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if f.creates_table:
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tablespace = f.db_tablespace or opts.db_tablespace
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if tablespace and connection.features.supports_tablespaces:
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tablespace_sql = ' ' + connection.ops.tablespace_sql(tablespace, inline=True)
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else:
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tablespace_sql = ''
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table_output = [style.SQL_KEYWORD('CREATE TABLE') + ' ' + \
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style.SQL_TABLE(qn(f.m2m_db_table())) + ' (']
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table_output.append(' %s %s %s%s,' %
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(style.SQL_FIELD(qn('id')),
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style.SQL_COLTYPE(models.AutoField(primary_key=True).db_type()),
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style.SQL_KEYWORD('NOT NULL PRIMARY KEY'),
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tablespace_sql))
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if inline_references:
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deferred = []
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table_output.append(' %s %s %s %s (%s)%s,' %
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(style.SQL_FIELD(qn(f.m2m_column_name())),
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style.SQL_COLTYPE(models.ForeignKey(model).db_type()),
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style.SQL_KEYWORD('NOT NULL REFERENCES'),
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style.SQL_TABLE(qn(opts.db_table)),
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style.SQL_FIELD(qn(opts.pk.column)),
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connection.ops.deferrable_sql()))
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table_output.append(' %s %s %s %s (%s)%s,' %
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(style.SQL_FIELD(qn(f.m2m_reverse_name())),
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style.SQL_COLTYPE(models.ForeignKey(f.rel.to).db_type()),
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style.SQL_KEYWORD('NOT NULL REFERENCES'),
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style.SQL_TABLE(qn(f.rel.to._meta.db_table)),
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style.SQL_FIELD(qn(f.rel.to._meta.pk.column)),
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connection.ops.deferrable_sql()))
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else:
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table_output.append(' %s %s %s,' %
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(style.SQL_FIELD(qn(f.m2m_column_name())),
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style.SQL_COLTYPE(models.ForeignKey(model).db_type()),
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style.SQL_KEYWORD('NOT NULL')))
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table_output.append(' %s %s %s,' %
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(style.SQL_FIELD(qn(f.m2m_reverse_name())),
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style.SQL_COLTYPE(models.ForeignKey(f.rel.to).db_type()),
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style.SQL_KEYWORD('NOT NULL')))
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deferred = [
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(f.m2m_db_table(), f.m2m_column_name(), opts.db_table,
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opts.pk.column),
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( f.m2m_db_table(), f.m2m_reverse_name(),
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f.rel.to._meta.db_table, f.rel.to._meta.pk.column)
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]
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table_output.append(' %s (%s, %s)%s' %
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(style.SQL_KEYWORD('UNIQUE'),
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style.SQL_FIELD(qn(f.m2m_column_name())),
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style.SQL_FIELD(qn(f.m2m_reverse_name())),
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tablespace_sql))
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table_output.append(')')
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if opts.db_tablespace and connection.features.supports_tablespaces:
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# f.db_tablespace is only for indices, so ignore its value here.
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table_output.append(connection.ops.tablespace_sql(opts.db_tablespace))
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table_output.append(';')
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final_output.append('\n'.join(table_output))
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for r_table, r_col, table, col in deferred:
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r_name = '%s_refs_%s_%x' % (r_col, col,
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abs(hash((r_table, table))))
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final_output.append(style.SQL_KEYWORD('ALTER TABLE') + ' %s ADD CONSTRAINT %s FOREIGN KEY (%s) REFERENCES %s (%s)%s;' %
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(qn(r_table),
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truncate_name(r_name, connection.ops.max_name_length()),
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qn(r_col), qn(table), qn(col),
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connection.ops.deferrable_sql()))
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# Add any extra SQL needed to support auto-incrementing PKs
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autoinc_sql = connection.ops.autoinc_sql(f.m2m_db_table(), 'id')
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if autoinc_sql:
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for stmt in autoinc_sql:
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final_output.append(stmt)
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return final_output
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def custom_sql_for_model(model, style):
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from django.db import models
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from django.conf import settings
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opts = model._meta
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app_dir = os.path.normpath(os.path.join(os.path.dirname(models.get_app(model._meta.app_label).__file__), 'sql'))
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|
output = []
|
|
|
|
# Post-creation SQL should come before any initial SQL data is loaded.
|
|
# However, this should not be done for fields that are part of a a parent
|
|
# model (via model inheritance).
|
|
nm = opts.init_name_map()
|
|
post_sql_fields = [f for f in opts.local_fields if hasattr(f, 'post_create_sql')]
|
|
for f in post_sql_fields:
|
|
output.extend(f.post_create_sql(style, model._meta.db_table))
|
|
|
|
# Some backends can't execute more than one SQL statement at a time,
|
|
# so split into separate statements.
|
|
statements = re.compile(r";[ \t]*$", re.M)
|
|
|
|
# Find custom SQL, if it's available.
|
|
sql_files = [os.path.join(app_dir, "%s.%s.sql" % (opts.object_name.lower(), settings.DATABASE_ENGINE)),
|
|
os.path.join(app_dir, "%s.sql" % opts.object_name.lower())]
|
|
for sql_file in sql_files:
|
|
if os.path.exists(sql_file):
|
|
fp = open(sql_file, 'U')
|
|
for statement in statements.split(fp.read().decode(settings.FILE_CHARSET)):
|
|
# Remove any comments from the file
|
|
statement = re.sub(ur"--.*([\n\Z]|$)", "", statement)
|
|
if statement.strip():
|
|
output.append(statement + u";")
|
|
fp.close()
|
|
|
|
return output
|
|
|
|
def sql_indexes_for_model(model, style):
|
|
"Returns the CREATE INDEX SQL statements for a single model"
|
|
from django.db import connection
|
|
output = []
|
|
|
|
qn = connection.ops.quote_name
|
|
for f in model._meta.local_fields:
|
|
if f.db_index and not f.unique:
|
|
tablespace = f.db_tablespace or model._meta.db_tablespace
|
|
if tablespace and connection.features.supports_tablespaces:
|
|
tablespace_sql = ' ' + connection.ops.tablespace_sql(tablespace)
|
|
else:
|
|
tablespace_sql = ''
|
|
output.append(
|
|
style.SQL_KEYWORD('CREATE INDEX') + ' ' + \
|
|
style.SQL_TABLE(qn('%s_%s' % (model._meta.db_table, f.column))) + ' ' + \
|
|
style.SQL_KEYWORD('ON') + ' ' + \
|
|
style.SQL_TABLE(qn(model._meta.db_table)) + ' ' + \
|
|
"(%s)" % style.SQL_FIELD(qn(f.column)) + \
|
|
"%s;" % tablespace_sql
|
|
)
|
|
return output
|
|
|
|
def emit_post_sync_signal(created_models, verbosity, interactive):
|
|
from django.db import models
|
|
from django.dispatch import dispatcher
|
|
# Emit the post_sync signal for every application.
|
|
for app in models.get_apps():
|
|
app_name = app.__name__.split('.')[-2]
|
|
if verbosity >= 2:
|
|
print "Running post-sync handlers for application", app_name
|
|
models.signals.post_syncdb.send(sender=app, app=app,
|
|
created_models=created_models, verbosity=verbosity,
|
|
interactive=interactive)
|