108 lines
4.2 KiB
Python
108 lines
4.2 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 (
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DEFAULT_DB_ALIAS, DatabaseError, connections, models, router, transaction,
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)
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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 = []
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def add_arguments(self, parser):
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parser.add_argument(
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'args', metavar='table_name', nargs='*',
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help='Optional table names. Otherwise, settings.CACHES is used to find cache tables.',
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)
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parser.add_argument(
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'--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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)
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parser.add_argument(
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'--dry-run', action='store_true',
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help='Does not create the table, just prints the SQL that would be run.',
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)
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def handle(self, *tablenames, **options):
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db = options['database']
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self.verbosity = options['verbosity']
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dry_run = options['dry_run']
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if 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, dry_run)
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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, dry_run)
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def create_table(self, database, tablename, dry_run):
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cache = BaseDatabaseCache(tablename, {})
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if not router.allow_migrate_model(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 = [
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qn(f.name),
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f.db_type(connection=connection),
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'%sNULL' % ('NOT ' if not f.null else ''),
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]
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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(
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"CREATE %sINDEX %s ON %s (%s);" %
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(unique, qn('%s_%s' % (tablename, f.name)), qn(tablename), qn(f.name))
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)
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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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full_statement = "\n".join(full_statement)
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if dry_run:
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self.stdout.write(full_statement)
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for statement in index_output:
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self.stdout.write(statement)
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return
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with transaction.atomic(using=database, 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(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, 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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