89 lines
3.8 KiB
Python
89 lines
3.8 KiB
Python
from django.conf import settings
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from django.core.cache import caches
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from django.core.cache.backends.db import BaseDatabaseCache
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from django.core.management.base import BaseCommand, CommandError
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from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
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from django.db.utils import DatabaseError
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from django.utils.encoding import force_text
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class Command(BaseCommand):
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help = "Creates the tables needed to use the SQL cache backend."
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requires_system_checks = False
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def add_arguments(self, parser):
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parser.add_argument('args', metavar='table_name', nargs='*',
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help='Optional table names. Otherwise, settings.CACHES is used to '
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'find cache tables.')
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parser.add_argument('--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS,
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help='Nominates a database onto which the cache tables will be '
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'installed. Defaults to the "default" database.')
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def handle(self, *tablenames, **options):
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db = options.get('database')
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self.verbosity = int(options.get('verbosity'))
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if len(tablenames):
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# Legacy behavior, tablename specified as argument
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for tablename in tablenames:
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self.create_table(db, tablename)
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else:
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for cache_alias in settings.CACHES:
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cache = caches[cache_alias]
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if isinstance(cache, BaseDatabaseCache):
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self.create_table(db, cache._table)
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def create_table(self, database, tablename):
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cache = BaseDatabaseCache(tablename, {})
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if not router.allow_migrate(database, cache.cache_model_class):
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return
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connection = connections[database]
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if tablename in connection.introspection.table_names():
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if self.verbosity > 0:
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self.stdout.write("Cache table '%s' already exists." % tablename)
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return
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fields = (
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# "key" is a reserved word in MySQL, so use "cache_key" instead.
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models.CharField(name='cache_key', max_length=255, unique=True, primary_key=True),
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models.TextField(name='value'),
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models.DateTimeField(name='expires', db_index=True),
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)
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table_output = []
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index_output = []
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qn = connection.ops.quote_name
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for f in fields:
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field_output = [qn(f.name), f.db_type(connection=connection)]
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field_output.append("%sNULL" % ("NOT " if not f.null else ""))
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if f.primary_key:
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field_output.append("PRIMARY KEY")
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elif f.unique:
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field_output.append("UNIQUE")
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if f.db_index:
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unique = "UNIQUE " if f.unique else ""
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index_output.append("CREATE %sINDEX %s ON %s (%s);" %
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(unique, qn('%s_%s' % (tablename, f.name)), qn(tablename),
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qn(f.name)))
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table_output.append(" ".join(field_output))
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full_statement = ["CREATE TABLE %s (" % qn(tablename)]
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for i, line in enumerate(table_output):
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full_statement.append(' %s%s' % (line, ',' if i < len(table_output) - 1 else ''))
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full_statement.append(');')
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with transaction.atomic(using=database,
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savepoint=connection.features.can_rollback_ddl):
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with connection.cursor() as curs:
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try:
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curs.execute("\n".join(full_statement))
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except DatabaseError as e:
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raise CommandError(
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"Cache table '%s' could not be created.\nThe error was: %s." %
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(tablename, force_text(e)))
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for statement in index_output:
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curs.execute(statement)
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if self.verbosity > 1:
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self.stdout.write("Cache table '%s' created." % tablename)
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