+
−from django.core.management.base import CommandError
+
−import os
+
−import re
+
−
+
−try:
+
−    set
+
−except NameError:
+
−    from sets import Set as set   # Python 2.3 fallback
+
−
+
−def sql_create(app, style):
+
−    "Returns a list of the CREATE TABLE SQL statements for the given app."
+
−    from django.db import connection, models
+
−    from django.conf import settings
+
−
+
−    if settings.DATABASE_ENGINE == 'dummy':
+
−        # This must be the "dummy" database backend, which means the user
+
−        # hasn't set DATABASE_ENGINE.
+
−        raise CommandError("Django doesn't know which syntax to use for your SQL statements,\n" +
+
−            "because you haven't specified the DATABASE_ENGINE setting.\n" +
+
−            "Edit your settings file and change DATABASE_ENGINE to something like 'postgresql' or '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)
+
−    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)
+
−
+
−    # Create the many-to-many join tables.
+
−    for model in app_models:
+
−        final_output.extend(connection.creation.sql_for_many_to_many(model, style))
+
−
+
−    # 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):
+
−    "Returns a list of the DROP TABLE SQL statements for the given app."
+
−    from django.db import connection, models
+
−    from django.db.backends.util import truncate_name
+
−    from django.contrib.contenttypes import generic
+
−
+
−    # 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)
+
−    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))
+
−
+
−    # Output DROP TABLE statements for many-to-many tables.
+
−    for model in app_models:
+
−        opts = model._meta
+
−        for f in opts.local_many_to_many:
+
−            if cursor and connection.introspection.table_name_converter(f.m2m_db_table()) in table_names:
+
−                output.extend(connection.creation.sql_destroy_many_to_many(model, f, 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):
+
−    "Returns a list of the DROP TABLE SQL, then the CREATE TABLE SQL, for the given module."
+
−    return sql_delete(app, style) + sql_all(app, style)
+
−
+
−def sql_flush(style, 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.
+
−    """
+
−    from django.db import connection
+
−    if only_django:
+
−        tables = connection.introspection.django_table_names()
+
−    else:
+
−        tables = connection.introspection.table_names()
+
−    statements = connection.ops.sql_flush(style, tables, connection.introspection.sequence_list())
+
−    return statements
+
−
+
−def sql_custom(app, style):
+
−    "Returns a list of the custom table modifying SQL statements for the given app."
+
−    from django.db.models import get_models
+
−    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))
+
−
+
−    return output
+
−
+
−def sql_indexes(app, style):
+
−    "Returns a list of the CREATE INDEX SQL statements for all models in the given app."
+
−    from django.db import connection, models
+
−    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):
+
−    "Returns a list of CREATE TABLE SQL, initial-data inserts, and CREATE INDEX SQL for the given module."
+
−    return sql_create(app, style) + sql_custom(app, style) + sql_indexes(app, style)
+
−
+
−def custom_sql_for_model(model, style):
+
−    from django.db import models
+
−    from django.conf import settings
+
−
+
−    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 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 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)