640 lines
25 KiB
Python
640 lines
25 KiB
Python
# This file is part of Tryton. The COPYRIGHT file at the top level of
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# this repository contains the full copyright notices and license terms.
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import logging
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import re
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from psycopg2.sql import SQL, Identifier
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from trytond.backend.table import (
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IndexTranslatorInterface, TableHandlerInterface)
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from trytond.transaction import Transaction
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__all__ = ['TableHandler']
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logger = logging.getLogger(__name__)
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VARCHAR_SIZE_RE = re.compile(r'VARCHAR\(([0-9]+)\)')
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class TableHandler(TableHandlerInterface):
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namedatalen = 64
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index_translators = []
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def _init(self, model, history=False):
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super()._init(model, history=history)
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self.__columns = None
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self.__constraints = None
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self.__fk_deltypes = None
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self.__indexes = None
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transaction = Transaction()
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cursor = transaction.connection.cursor()
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# Create sequence if necessary
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if not transaction.database.sequence_exist(
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transaction.connection, self.sequence_name):
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transaction.database.sequence_create(
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transaction.connection, self.sequence_name)
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# Create new table if necessary
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if not self.table_exist(self.table_name):
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cursor.execute(SQL('CREATE TABLE {} ()').format(
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Identifier(self.table_name)))
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self.table_schema = transaction.database.get_table_schema(
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transaction.connection, self.table_name)
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cursor.execute('SELECT tableowner = current_user FROM pg_tables '
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'WHERE tablename = %s AND schemaname = %s',
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(self.table_name, self.table_schema))
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self.is_owner, = cursor.fetchone()
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if model.__doc__ and self.is_owner:
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cursor.execute(SQL('COMMENT ON TABLE {} IS %s').format(
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Identifier(self.table_name)),
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(model.__doc__,))
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if 'id' not in self._columns:
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if not self.history:
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cursor.execute(
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SQL(
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"ALTER TABLE {} ADD COLUMN id INTEGER "
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"DEFAULT nextval(%s) NOT NULL").format(
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Identifier(self.table_name)),
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(self.sequence_name,))
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cursor.execute(
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SQL('ALTER TABLE {} ADD PRIMARY KEY(id)')
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.format(Identifier(self.table_name)))
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else:
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cursor.execute(
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SQL('ALTER TABLE {} ADD COLUMN id INTEGER')
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.format(Identifier(self.table_name)))
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self._update_definitions(columns=True)
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if self.history and '__id' not in self._columns:
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cursor.execute(
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SQL(
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"ALTER TABLE {} ADD COLUMN __id INTEGER "
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"DEFAULT nextval(%s) NOT NULL").format(
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Identifier(self.table_name)),
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(self.sequence_name,))
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cursor.execute(
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SQL('ALTER TABLE {} ADD PRIMARY KEY(__id)')
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.format(Identifier(self.table_name)))
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self._update_definitions(columns=True)
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else:
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default = "nextval('%s'::regclass)" % self.sequence_name
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if self.history:
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if self._columns['__id']['default'] != default:
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cursor.execute(
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SQL("ALTER TABLE {} "
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"ALTER __id SET DEFAULT nextval(%s::regclass)")
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.format(Identifier(self.table_name)),
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(self.sequence_name,))
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self._update_definitions(columns=True)
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if self._columns['id']['default'] != default:
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cursor.execute(
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SQL("ALTER TABLE {} "
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"ALTER id SET DEFAULT nextval(%s::regclass)")
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.format(Identifier(self.table_name)),
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(self.sequence_name,))
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self._update_definitions(columns=True)
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@classmethod
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def table_exist(cls, table_name):
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transaction = Transaction()
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return bool(transaction.database.get_table_schema(
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transaction.connection, table_name))
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@classmethod
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def table_rename(cls, old_name, new_name):
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transaction = Transaction()
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cursor = transaction.connection.cursor()
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# Rename table
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if (cls.table_exist(old_name)
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and not cls.table_exist(new_name)):
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cursor.execute(SQL('ALTER TABLE {} RENAME TO {}').format(
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Identifier(old_name), Identifier(new_name)))
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# Rename sequence
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old_sequence = old_name + '_id_seq'
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new_sequence = new_name + '_id_seq'
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transaction.database.sequence_rename(
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transaction.connection, old_sequence, new_sequence)
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# Rename history table
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old_history = old_name + "__history"
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new_history = new_name + "__history"
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if (cls.table_exist(old_history)
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and not cls.table_exist(new_history)):
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cursor.execute('ALTER TABLE "%s" RENAME TO "%s"'
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% (old_history, new_history))
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def column_exist(self, column_name):
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return column_name in self._columns
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def column_rename(self, old_name, new_name):
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cursor = Transaction().connection.cursor()
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if self.column_exist(old_name):
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if not self.column_exist(new_name):
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cursor.execute(SQL(
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'ALTER TABLE {} RENAME COLUMN {} TO {}').format(
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Identifier(self.table_name),
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Identifier(old_name),
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Identifier(new_name)))
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self._update_definitions(columns=True)
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else:
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logger.warning(
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'Unable to rename column %s on table %s to %s.',
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old_name, self.table_name, new_name)
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@property
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def _columns(self):
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if self.__columns is None:
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cursor = Transaction().connection.cursor()
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self.__columns = {}
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# Fetch columns definitions from the table
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cursor.execute('SELECT '
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'column_name, udt_name, is_nullable, '
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'character_maximum_length, '
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'column_default '
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'FROM information_schema.columns '
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'WHERE table_name = %s AND table_schema = %s',
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(self.table_name, self.table_schema))
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for column, typname, nullable, size, default in cursor:
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self.__columns[column] = {
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'typname': typname,
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'notnull': True if nullable == 'NO' else False,
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'size': size,
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'default': default,
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}
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return self.__columns
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@property
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def _constraints(self):
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if self.__constraints is None:
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cursor = Transaction().connection.cursor()
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# fetch constraints for the table
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cursor.execute('SELECT constraint_name '
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'FROM information_schema.table_constraints '
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'WHERE table_name = %s AND table_schema = %s',
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(self.table_name, self.table_schema))
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self.__constraints = [c for c, in cursor]
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# add nonstandard exclude constraint
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cursor.execute('SELECT c.conname '
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'FROM pg_namespace nc, '
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'pg_namespace nr, '
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'pg_constraint c, '
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'pg_class r '
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'WHERE nc.oid = c.connamespace AND nr.oid = r.relnamespace '
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'AND c.conrelid = r.oid '
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"AND c.contype = 'x' " # exclude type
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"AND r.relkind IN ('r', 'p') "
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'AND r.relname = %s AND nr.nspname = %s',
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(self.table_name, self.table_schema))
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self.__constraints.extend((c for c, in cursor))
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return self.__constraints
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@property
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def _fk_deltypes(self):
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if self.__fk_deltypes is None:
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cursor = Transaction().connection.cursor()
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cursor.execute('SELECT k.column_name, r.delete_rule '
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'FROM information_schema.key_column_usage AS k '
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'JOIN information_schema.referential_constraints AS r '
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'ON r.constraint_schema = k.constraint_schema '
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'AND r.constraint_name = k.constraint_name '
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'WHERE k.table_name = %s AND k.table_schema = %s',
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(self.table_name, self.table_schema))
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self.__fk_deltypes = dict(cursor)
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return self.__fk_deltypes
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@property
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def _indexes(self):
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if self.__indexes is None:
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cursor = Transaction().connection.cursor()
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# Fetch indexes defined for the table
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cursor.execute("SELECT cl2.relname "
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"FROM pg_index ind "
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"JOIN pg_class cl on (cl.oid = ind.indrelid) "
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"JOIN pg_namespace n ON (cl.relnamespace = n.oid) "
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"JOIN pg_class cl2 on (cl2.oid = ind.indexrelid) "
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"WHERE cl.relname = %s AND n.nspname = %s "
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"AND NOT ind.indisprimary AND NOT ind.indisunique",
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(self.table_name, self.table_schema))
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self.__indexes = [l[0] for l in cursor]
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return self.__indexes
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def _update_definitions(self, columns=True, constraints=True):
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if columns:
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self.__columns = None
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if constraints:
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self.__constraints = None
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self.__fk_deltypes = None
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def alter_size(self, column_name, column_type):
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cursor = Transaction().connection.cursor()
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cursor.execute(
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SQL("ALTER TABLE {} ALTER COLUMN {} TYPE {}").format(
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Identifier(self.table_name),
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Identifier(column_name),
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SQL(column_type)))
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self._update_definitions(columns=True)
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def alter_type(self, column_name, column_type):
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cursor = Transaction().connection.cursor()
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cursor.execute(SQL('ALTER TABLE {} ALTER {} TYPE {}').format(
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Identifier(self.table_name),
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Identifier(column_name),
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SQL(column_type)))
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self._update_definitions(columns=True)
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def column_is_type(self, column_name, type_, *, size=-1):
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db_type = self._columns[column_name]['typname'].upper()
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database = Transaction().database
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base_type = database.sql_type(type_).base.upper()
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if base_type == 'VARCHAR' and (size is None or size >= 0):
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same_size = self._columns[column_name]['size'] == size
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else:
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same_size = True
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return base_type == db_type and same_size
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def db_default(self, column_name, value):
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if value in [True, False]:
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test = str(value).lower()
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else:
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test = value
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if self._columns[column_name]['default'] != test:
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cursor = Transaction().connection.cursor()
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cursor.execute(
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SQL(
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'ALTER TABLE {} ALTER COLUMN {} SET DEFAULT %s').format(
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Identifier(self.table_name),
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Identifier(column_name)),
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(value,))
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def add_column(self, column_name, sql_type, default=None, comment=''):
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cursor = Transaction().connection.cursor()
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database = Transaction().database
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column_type = database.sql_type(sql_type)
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match = VARCHAR_SIZE_RE.match(sql_type)
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field_size = int(match.group(1)) if match else None
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def add_comment():
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if comment and self.is_owner:
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cursor.execute(
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SQL('COMMENT ON COLUMN {}.{} IS %s').format(
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Identifier(self.table_name),
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Identifier(column_name)),
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(comment,))
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if self.column_exist(column_name):
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if (column_name in ('create_date', 'write_date')
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and column_type[1].lower() != 'timestamp(6)'):
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# Migrate dates from timestamp(0) to timestamp
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cursor.execute(
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SQL(
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'ALTER TABLE {} ALTER COLUMN {} TYPE timestamp')
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.format(
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Identifier(self.table_name),
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Identifier(column_name)))
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add_comment()
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base_type = column_type[0].lower()
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if base_type != self._columns[column_name]['typname']:
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if (self._columns[column_name]['typname'], base_type) in [
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('varchar', 'text'),
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('text', 'varchar'),
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('date', 'timestamp'),
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('int4', 'int8'),
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('int4', 'float8'),
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('int4', 'numeric'),
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('int8', 'float8'),
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('int8', 'numeric'),
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('float8', 'numeric'),
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]:
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self.alter_type(column_name, base_type)
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else:
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logger.warning(
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'Unable to migrate column %s on table %s '
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'from %s to %s.',
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column_name, self.table_name,
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self._columns[column_name]['typname'], base_type)
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if (base_type == 'varchar'
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and self._columns[column_name]['typname'] == 'varchar'):
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# Migrate size
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from_size = self._columns[column_name]['size']
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if field_size is None:
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if from_size:
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self.alter_size(column_name, base_type)
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elif from_size == field_size:
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pass
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elif from_size and from_size < field_size:
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self.alter_size(column_name, column_type[1])
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else:
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logger.warning(
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'Unable to migrate column %s on table %s '
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'from varchar(%s) to varchar(%s).',
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column_name, self.table_name,
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from_size if from_size and from_size > 0 else "",
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field_size)
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return
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column_type = column_type[1]
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cursor.execute(
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SQL('ALTER TABLE {} ADD COLUMN {} {}').format(
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Identifier(self.table_name),
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Identifier(column_name),
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SQL(column_type)))
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add_comment()
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if default:
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# check if table is non-empty:
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cursor.execute('SELECT 1 FROM "%s" limit 1' % self.table_name)
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if cursor.rowcount:
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# Populate column with default values:
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cursor.execute(
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SQL('UPDATE {} SET {} = %s').format(
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Identifier(self.table_name),
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Identifier(column_name)),
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(default(),))
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self._update_definitions(columns=True)
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def add_fk(self, column_name, reference, on_delete=None):
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if on_delete is not None:
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on_delete = on_delete.upper()
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else:
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on_delete = 'SET NULL'
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cursor = Transaction().connection.cursor()
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name = self.convert_name(self.table_name + '_' + column_name + '_fkey')
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if name in self._constraints:
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if self._fk_deltypes.get(column_name) != on_delete:
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self.drop_fk(column_name)
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add = True
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else:
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add = False
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else:
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add = True
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if add:
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cursor.execute(
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SQL(
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"ALTER TABLE {table} "
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"ADD CONSTRAINT {constraint} "
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"FOREIGN KEY ({column}) REFERENCES {reference} "
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"ON DELETE {action}"
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)
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.format(
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table=Identifier(self.table_name),
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constraint=Identifier(name),
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column=Identifier(column_name),
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reference=Identifier(reference),
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action=SQL(on_delete)))
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self._update_definitions(constraints=True)
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def drop_fk(self, column_name, table=None):
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self.drop_constraint(column_name + '_fkey', table=table)
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def not_null_action(self, column_name, action='add'):
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if not self.column_exist(column_name):
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return
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with Transaction().connection.cursor() as cursor:
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if action == 'add':
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if self._columns[column_name]['notnull']:
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return
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cursor.execute(SQL(
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'SELECT id FROM {} WHERE {} IS NULL').format(
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Identifier(self.table_name),
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Identifier(column_name)))
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if not cursor.rowcount:
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cursor.execute(
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SQL(
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'ALTER TABLE {} ALTER COLUMN {} SET NOT NULL')
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.format(
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Identifier(self.table_name),
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Identifier(column_name)))
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self._update_definitions(columns=True)
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else:
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logger.warning(
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"Unable to set not null on column %s of table %s.\n"
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"Try restarting one more time.\n"
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"If that doesn't work update the records and restart "
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"again.",
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column_name, self.table_name)
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elif action == 'remove':
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if not self._columns[column_name]['notnull']:
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return
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cursor.execute(
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SQL('ALTER TABLE {} ALTER COLUMN {} DROP NOT NULL')
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.format(
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Identifier(self.table_name),
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Identifier(column_name)))
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self._update_definitions(columns=True)
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else:
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raise Exception('Not null action not supported!')
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def add_constraint(self, ident, constraint):
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ident = self.convert_name(self.table_name + "_" + ident)
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if ident in self._constraints:
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# This constrain already exist
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return
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cursor = Transaction().connection.cursor()
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cursor.execute(
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SQL('ALTER TABLE {} ADD CONSTRAINT {} {}').format(
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Identifier(self.table_name),
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Identifier(ident),
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SQL(str(constraint))),
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constraint.params)
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self._update_definitions(constraints=True)
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def drop_constraint(self, ident, table=None):
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ident = self.convert_name((table or self.table_name) + "_" + ident)
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if ident not in self._constraints:
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return
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cursor = Transaction().connection.cursor()
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cursor.execute(
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SQL('ALTER TABLE {} DROP CONSTRAINT {}').format(
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Identifier(self.table_name), Identifier(ident)))
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self._update_definitions(constraints=True)
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def set_indexes(self, indexes):
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cursor = Transaction().connection.cursor()
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old = set(self._indexes)
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for index in indexes:
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translator = self.index_translator_for(index)
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if translator:
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name, query, params = translator.definition(index)
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name = '_'.join([self.table_name, name])
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name = 'idx_' + self.convert_name(name, reserved=len('idx_'))
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cursor.execute(
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SQL('CREATE INDEX IF NOT EXISTS {} ON {} USING {}').format(
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Identifier(name),
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Identifier(self.table_name),
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query),
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params)
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old.discard(name)
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for name in old:
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if name.startswith('idx_') or name.endswith('_index'):
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cursor.execute(SQL('DROP INDEX {}').format(Identifier(name)))
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self.__indexes = None
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def drop_column(self, column_name):
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if not self.column_exist(column_name):
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return
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cursor = Transaction().connection.cursor()
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cursor.execute(SQL('ALTER TABLE {} DROP COLUMN {}').format(
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Identifier(self.table_name),
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Identifier(column_name)))
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self._update_definitions(columns=True)
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@classmethod
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def drop_table(cls, model, table, cascade=False):
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cursor = Transaction().connection.cursor()
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cursor.execute('DELETE FROM ir_model_data WHERE model = %s', (model,))
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query = 'DROP TABLE {}'
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if cascade:
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query = query + ' CASCADE'
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cursor.execute(SQL(query).format(Identifier(table)))
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class IndexMixin:
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_type = None
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def __init_subclass__(cls):
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TableHandler.index_translators.append(cls)
|
|
|
|
@classmethod
|
|
def definition(cls, index):
|
|
expr_template = SQL('{expression} {collate} {opclass} {order}')
|
|
indexed_expressions = cls._get_indexed_expressions(index)
|
|
expressions = []
|
|
params = []
|
|
for expression, usage in indexed_expressions:
|
|
expressions.append(expr_template.format(
|
|
**cls._get_expression_variables(expression, usage)))
|
|
params.extend(expression.params)
|
|
|
|
include = SQL('')
|
|
if index.options.get('include'):
|
|
include = SQL('INCLUDE ({columns})').format(
|
|
columns=SQL(',').join(map(
|
|
lambda c: SQL(str(c)),
|
|
index.options.get('include'))))
|
|
|
|
where = SQL('')
|
|
if index.options.get('where'):
|
|
where = SQL('WHERE {where}').format(
|
|
where=SQL(str(index.options['where'])))
|
|
params.extend(index.options['where'].params)
|
|
|
|
query = SQL('{type} ({expressions}) {include} {where}').format(
|
|
type=SQL(cls._type),
|
|
expressions=SQL(',').join(expressions),
|
|
include=include,
|
|
where=where)
|
|
name = cls._get_name(query, params)
|
|
return name, query, params
|
|
|
|
@classmethod
|
|
def _get_indexed_expressions(cls, index):
|
|
return index.expressions
|
|
|
|
@classmethod
|
|
def _get_expression_variables(cls, expression, usage):
|
|
variables = {
|
|
'expression': SQL(str(expression)),
|
|
'collate': SQL(''),
|
|
'opclass': SQL(''),
|
|
'order': SQL(''),
|
|
}
|
|
if usage.options.get('collation'):
|
|
variables['collate'] = SQL('COLLATE {}').format(
|
|
usage.options['collation'])
|
|
if usage.options.get('order'):
|
|
order = usage.options['order'].upper()
|
|
variables['order'] = SQL(order)
|
|
return variables
|
|
|
|
|
|
class HashTranslator(IndexMixin, IndexTranslatorInterface):
|
|
_type = 'HASH'
|
|
|
|
@classmethod
|
|
def score(cls, index):
|
|
if (len(index.expressions) > 1
|
|
or index.expressions[0][1].__class__.__name__ != 'Equality'):
|
|
return 0
|
|
return 100
|
|
|
|
@classmethod
|
|
def _get_indexed_expressions(cls, index):
|
|
return [
|
|
(e, u) for e, u in index.expressions
|
|
if u.__class__.__name__ == 'Equality'][:1]
|
|
|
|
|
|
class BTreeTranslator(IndexMixin, IndexTranslatorInterface):
|
|
_type = 'BTREE'
|
|
|
|
@classmethod
|
|
def score(cls, index):
|
|
score = 0
|
|
for _, usage in index.expressions:
|
|
if usage.__class__.__name__ == 'Range':
|
|
score += 100
|
|
elif usage.__class__.__name__ == 'Equality':
|
|
score += 50
|
|
elif usage.__class__.__name__ == 'Similarity':
|
|
score += 20
|
|
if usage.options.get('begin'):
|
|
score += 100
|
|
return score
|
|
|
|
@classmethod
|
|
def _get_expressions(cls, index):
|
|
return [
|
|
(e, u) for e, u in index.expressions
|
|
if u.__class__.__name__ in {'Equality', 'Range'}]
|
|
|
|
@classmethod
|
|
def _get_expression_variables(cls, expression, usage):
|
|
params = super()._get_expression_variables(expression, usage)
|
|
if (usage.__class__.__name__ == 'Similarity'
|
|
and not usage.options.get('collation')):
|
|
# text_pattern_ops and varchar_pattern_ops are the same
|
|
params['opclass'] = SQL('varchar_pattern_ops')
|
|
return params
|
|
|
|
|
|
class TrigramTranslator(IndexMixin, IndexTranslatorInterface):
|
|
_type = 'GIN'
|
|
|
|
@classmethod
|
|
def score(cls, index):
|
|
has_trigram = Transaction().database.has_extension('pg_trgm')
|
|
if not has_trigram:
|
|
return 0
|
|
|
|
score = 0
|
|
for _, usage in index.expressions:
|
|
if usage.__class__.__name__ == 'Similarity':
|
|
score += 100
|
|
else:
|
|
return 0
|
|
return score
|
|
|
|
@classmethod
|
|
def _get_expressions(cls, index):
|
|
return [
|
|
(e, u) for e, u in index.expressions
|
|
if u.__class__.__name__ == 'Similarity']
|
|
|
|
@classmethod
|
|
def _get_expression_variables(cls, expression, usage):
|
|
params = super()._get_expression_variables(expression, usage)
|
|
if usage.__class__.__name__ == 'Similarity':
|
|
params['opclass'] = SQL('gin_trgm_ops')
|
|
return params
|