58 lines
2.4 KiB
Python
58 lines
2.4 KiB
Python
from optparse import make_option
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from django.core.cache.backends.db import BaseDatabaseCache
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from django.core.management.base import LabelCommand
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from django.db import connections, router, transaction, models, DEFAULT_DB_ALIAS
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class Command(LabelCommand):
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help = "Creates the table needed to use the SQL cache backend."
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args = "<tablename>"
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label = 'tablename'
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option_list = LabelCommand.option_list + (
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make_option('--database', action='store', dest='database',
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default=DEFAULT_DB_ALIAS, help='Nominates a database onto '
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'which the cache table will be installed. '
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'Defaults to the "default" database.'),
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)
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requires_model_validation = False
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def handle_label(self, tablename, **options):
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db = options.get('database', DEFAULT_DB_ALIAS)
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cache = BaseDatabaseCache(tablename, {})
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if not router.allow_syncdb(db, cache.cache_model_class):
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return
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connection = connections[db]
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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 f.null and "NOT " or ""))
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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 = f.unique and "UNIQUE " or ""
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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, i < len(table_output)-1 and ',' or ''))
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full_statement.append(');')
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curs = connection.cursor()
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curs.execute("\n".join(full_statement))
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for statement in index_output:
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curs.execute(statement)
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transaction.commit_unless_managed(using=db)
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