185 lines
7.8 KiB
Python
185 lines
7.8 KiB
Python
import os
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import re
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from django.conf import settings
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from django.core.management.base import CommandError
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from django.db import models
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from django.db.models import get_models
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def sql_create(app, style, connection):
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"Returns a list of the CREATE TABLE SQL statements for the given app."
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if connection.settings_dict['ENGINE'] == 'django.db.backends.dummy':
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# This must be the "dummy" database backend, which means the user
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# hasn't set ENGINE for the databse.
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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 ENGINE setting for the database.\n" +
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"Edit your settings file and change DATBASES['default']['ENGINE'] to something like\n" +
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"'django.db.backends.postgresql' or 'django.db.backends.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, include_auto_created=True)
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final_output = []
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tables = connection.introspection.table_names()
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known_models = set([model for model in connection.introspection.installed_models(tables) 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 = connection.creation.sql_create_model(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(connection.creation.sql_for_pending_references(refto, style, pending_references))
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final_output.extend(connection.creation.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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# 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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connection.creation.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, connection):
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"Returns a list of the DROP TABLE SQL statements for the given app."
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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 = connection.introspection.get_table_list(cursor)
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else:
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table_names = []
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output = []
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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, include_auto_created=True)
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for model in app_models:
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if cursor and connection.introspection.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 connection.introspection.table_name_converter(model._meta.db_table) in table_names:
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output.extend(connection.creation.sql_destroy_model(model, references_to_delete, style))
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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, connection):
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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, connection) + sql_all(app, style, connection)
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def sql_flush(style, connection, 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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if only_django:
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tables = connection.introspection.django_table_names(only_existing=True)
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else:
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tables = connection.introspection.table_names()
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statements = connection.ops.sql_flush(
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style, tables, connection.introspection.sequence_list()
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)
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return statements
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def sql_custom(app, style, connection):
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"Returns a list of the custom table modifying SQL statements for the given app."
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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, connection))
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return output
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def sql_indexes(app, style, connection):
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"Returns a list of the CREATE INDEX SQL statements for all models in the given app."
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output = []
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for model in models.get_models(app):
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output.extend(connection.creation.sql_indexes_for_model(model, style))
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return output
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def sql_all(app, style, connection):
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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, connection) + sql_custom(app, style, connection) + sql_indexes(app, style, connection)
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def custom_sql_for_model(model, style, connection):
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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 = []
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# Post-creation SQL should come before any initial SQL data is loaded.
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# However, this should not be done for models that are unmanaged or
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# for fields that are part of a parent model (via model inheritance).
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if opts.managed:
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post_sql_fields = [f for f in opts.local_fields if hasattr(f, 'post_create_sql')]
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for f in post_sql_fields:
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output.extend(f.post_create_sql(style, model._meta.db_table))
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# Some backends can't execute more than one SQL statement at a time,
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# so split into separate statements.
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statements = re.compile(r";[ \t]*$", re.M)
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# Find custom SQL, if it's available.
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backend_name = connection.settings_dict['ENGINE'].split('.')[-1]
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sql_files = [os.path.join(app_dir, "%s.%s.sql" % (opts.object_name.lower(), backend_name)),
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os.path.join(app_dir, "%s.sql" % opts.object_name.lower())]
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for sql_file in sql_files:
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if os.path.exists(sql_file):
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fp = open(sql_file, 'U')
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for statement in statements.split(fp.read().decode(settings.FILE_CHARSET)):
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# Remove any comments from the file
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statement = re.sub(ur"--.*([\n\Z]|$)", "", statement)
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if statement.strip():
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output.append(statement + u";")
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fp.close()
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return output
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def emit_post_sync_signal(created_models, verbosity, interactive, db):
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# Emit the post_sync signal for every application.
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for app in models.get_apps():
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app_name = app.__name__.split('.')[-2]
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if verbosity >= 2:
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print "Running post-sync handlers for application", app_name
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models.signals.post_syncdb.send(sender=app, app=app,
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created_models=created_models, verbosity=verbosity,
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interactive=interactive, db=db)
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