import os import re from django.conf import settings from django.core.management.base import CommandError from django.db import models from django.db.models import get_models def sql_create(app, style, connection): "Returns a list of the CREATE TABLE SQL statements for the given app." if connection.settings_dict['ENGINE'] == 'django.db.backends.dummy': # This must be the "dummy" database backend, which means the user # hasn't set ENGINE for the databse. raise CommandError("Django doesn't know which syntax to use for your SQL statements,\n" + "because you haven't specified the ENGINE setting for the database.\n" + "Edit your settings file and change DATBASES['default']['ENGINE'] to something like\n" + "'django.db.backends.postgresql' or 'django.db.backends.mysql'.") # Get installed models, so we generate REFERENCES right. # We trim models from the current app so that the sqlreset command does not # generate invalid SQL (leaving models out of known_models is harmless, so # we can be conservative). app_models = models.get_models(app, include_auto_created=True) final_output = [] tables = connection.introspection.table_names() known_models = set([model for model in connection.introspection.installed_models(tables) if model not in app_models]) pending_references = {} for model in app_models: output, references = connection.creation.sql_create_model(model, style, known_models) final_output.extend(output) for refto, refs in references.items(): pending_references.setdefault(refto, []).extend(refs) if refto in known_models: final_output.extend(connection.creation.sql_for_pending_references(refto, style, pending_references)) final_output.extend(connection.creation.sql_for_pending_references(model, style, pending_references)) # Keep track of the fact that we've created the table for this model. known_models.add(model) # Handle references to tables that are from other apps # but don't exist physically. not_installed_models = set(pending_references.keys()) if not_installed_models: alter_sql = [] for model in not_installed_models: alter_sql.extend(['-- ' + sql for sql in connection.creation.sql_for_pending_references(model, style, pending_references)]) if alter_sql: final_output.append('-- The following references should be added but depend on non-existent tables:') final_output.extend(alter_sql) return final_output def sql_delete(app, style, connection): "Returns a list of the DROP TABLE SQL statements for the given app." # This should work even if a connection isn't available try: cursor = connection.cursor() except: cursor = None # Figure out which tables already exist if cursor: table_names = connection.introspection.get_table_list(cursor) else: table_names = [] output = [] # Output DROP TABLE statements for standard application tables. to_delete = set() references_to_delete = {} app_models = models.get_models(app, include_auto_created=True) for model in app_models: if cursor and connection.introspection.table_name_converter(model._meta.db_table) in table_names: # The table exists, so it needs to be dropped opts = model._meta for f in opts.local_fields: if f.rel and f.rel.to not in to_delete: references_to_delete.setdefault(f.rel.to, []).append( (model, f) ) to_delete.add(model) for model in app_models: if connection.introspection.table_name_converter(model._meta.db_table) in table_names: output.extend(connection.creation.sql_destroy_model(model, references_to_delete, style)) # Close database connection explicitly, in case this output is being piped # directly into a database client, to avoid locking issues. if cursor: cursor.close() connection.close() return output[::-1] # Reverse it, to deal with table dependencies. def sql_reset(app, style, connection): "Returns a list of the DROP TABLE SQL, then the CREATE TABLE SQL, for the given module." return sql_delete(app, style, connection) + sql_all(app, style, connection) def sql_flush(style, connection, only_django=False): """ Returns a list of the SQL statements used to flush the database. If only_django is True, then only table names that have associated Django models and are in INSTALLED_APPS will be included. """ if only_django: tables = connection.introspection.django_table_names(only_existing=True) else: tables = connection.introspection.table_names() statements = connection.ops.sql_flush(style, tables, connection.introspection.sequence_list()) return statements def sql_custom(app, style, connection): "Returns a list of the custom table modifying SQL statements for the given app." output = [] app_models = get_models(app) app_dir = os.path.normpath(os.path.join(os.path.dirname(app.__file__), 'sql')) for model in app_models: output.extend(custom_sql_for_model(model, style, connection)) return output def sql_indexes(app, style, connection): "Returns a list of the CREATE INDEX SQL statements for all models in the given app." output = [] for model in models.get_models(app): output.extend(connection.creation.sql_indexes_for_model(model, style)) return output def sql_all(app, style, connection): "Returns a list of CREATE TABLE SQL, initial-data inserts, and CREATE INDEX SQL for the given module." return sql_create(app, style, connection) + sql_custom(app, style, connection) + sql_indexes(app, style, connection) def custom_sql_for_model(model, style, connection): opts = model._meta app_dir = os.path.normpath(os.path.join(os.path.dirname(models.get_app(model._meta.app_label).__file__), 'sql')) output = [] # Post-creation SQL should come before any initial SQL data is loaded. # However, this should not be done for models that are unmanaged or # for fields that are part of a parent model (via model inheritance). if opts.managed: 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]*$", re.M) # Find custom SQL, if it's available. backend_name = connection.settings_dict['ENGINE'].split('.')[-1] sql_files = [os.path.join(app_dir, "%s.%s.sql" % (opts.object_name.lower(), backend_name)), os.path.join(app_dir, "%s.sql" % opts.object_name.lower())] for sql_file in sql_files: if os.path.exists(sql_file): fp = open(sql_file, 'U') for statement in statements.split(fp.read().decode(settings.FILE_CHARSET)): # Remove any comments from the file statement = re.sub(ur"--.*([\n\Z]|$)", "", statement) if statement.strip(): output.append(statement + u";") fp.close() return output def emit_post_sync_signal(created_models, verbosity, interactive, db): # 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, db=db)