415 lines
17 KiB
Python
415 lines
17 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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from trytond.backend.table import TableHandlerInterface
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import logging
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class TableHandler(TableHandlerInterface):
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def __init__(self, cursor, model, module_name=None, history=False):
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super(TableHandler, self).__init__(cursor, model,
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module_name=module_name, history=history)
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self._columns = {}
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self._constraints = []
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self._fkeys = []
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self._indexes = []
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self._field2module = {}
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self._model = model
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# Create new table if necessary
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if not self.table_exist(self.cursor, self.table_name):
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if not self.history:
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self.cursor.execute('CREATE TABLE `%s` (' \
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'id BIGINT AUTO_INCREMENT NOT NULL, ' \
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'PRIMARY KEY(id)' \
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') ENGINE=InnoDB;' % self.table_name)
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else:
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self.cursor.execute('CREATE TABLE `%s` (' \
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'__id BIGINT AUTO_INCREMENT NOT NULL, ' \
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'id BIGINT, ' \
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'PRIMARY KEY(__id)' \
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') ENGINE=InnoDB;' % self.table_name)
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self._update_definitions()
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if 'id' not in self._columns:
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if not self.history:
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self.cursor.execute('ALTER TABLE `%s` ' \
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'ADD COLUMN id BIGINT AUTO_INCREMENT ' \
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'NOT NULL PRIMARY KEY' %
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self.table_name)
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else:
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self.cursor.execute('ALTER TABLE `%s` ' \
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'ADD COLUMN id BIGINT' % self.table_name)
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self._update_definitions()
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if self.history and not '__id' in self._columns:
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self.cursor.execute('ALTER TABLE `%s` ' \
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'ADD COLUMN __id BIGINT AUTO_INCREMENT ' \
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'NOT NULL PRIMARY KEY' %
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self.table_name)
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self._update_definitions()
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@staticmethod
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def table_exist(cursor, table_name):
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cursor.execute("SELECT table_name FROM information_schema.tables " \
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"WHERE table_schema = %s AND table_name = %s",
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(cursor.database_name, table_name))
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return bool(cursor.rowcount)
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@staticmethod
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def table_rename(cursor, old_name, new_name):
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#Rename table
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if TableHandler.table_exist(cursor, old_name) and \
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not TableHandler.table_exist(cursor, new_name):
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cursor.execute('ALTER TABLE `%s` RENAME TO `%s`' % \
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(old_name, new_name))
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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 TableHandler.table_exist(cursor, old_history) and \
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not TableHandler.table_exist(cursor, 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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@staticmethod
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def sequence_exist(cursor, sequence_name):
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return True
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@staticmethod
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def sequence_rename(cursor, old_name, new_name):
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pass
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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, exception=False):
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if self.column_exist(old_name) and \
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not self.column_exist(new_name):
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self.cursor.execute('ALTER TABLE `%s` ' \
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'RENAME COLUMN `%s` TO `%s`' %
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(self.table_name, old_name, new_name))
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elif exception and self.column_exist(new_name):
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raise Exception('Unable to rename column %s.%s to %s.%s: ' \
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'%s.%s already exist!' % \
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(self.table_name, old_name, self.table_name, new_name,
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self.table_name, new_name))
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def _update_definitions(self):
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# Fetch columns definitions from the table
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self.cursor.execute("SELECT column_name, character_maximum_length, " \
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"data_type, is_nullable, column_default " \
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"FROM information_schema.columns " \
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"WHERE table_schema = %s AND table_name = %s",
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(self.cursor.database_name, self.table_name))
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self._columns = {}
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for line in self.cursor.fetchall():
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column, size, typname, nullable, default = line
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self._columns[column] = {
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'size': size,
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'typname': typname,
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'nullable': nullable == 'YES' and True or False,
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'default': default,
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}
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# fetch constraints for the table
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self.cursor.execute("SELECT constraint_name, constraint_type " \
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"FROM information_schema.table_constraints " \
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"WHERE table_schema = %s AND table_name = %s",
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(self.cursor.database_name, self.table_name))
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self._constraints = []
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self._fkeys = []
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for line in self.cursor.fetchall():
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conname, contype = line
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if contype not in ('PRIMARY KEY', 'FOREIGN KEY'):
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self._constraints.append(conname)
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elif contype == 'FOREIGN KEY':
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self._fkeys.append(conname)
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# Fetch indexes defined for the table
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self.cursor.execute('SHOW INDEXES FROM `%s`' % self.table_name)
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self._indexes = list(set(x[2] for x in self.cursor.fetchall()
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if x[2] != 'PRIMARY'))
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# Keep track of which module created each field
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self._field2module = {}
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if self.object_name is not None:
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self.cursor.execute('SELECT f.name, f.module '\
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'FROM ir_model_field f '\
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'JOIN ir_model m on (f.model=m.id) '\
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'WHERE m.model = %s',
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(self.object_name,)
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)
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for line in self.cursor.fetchall():
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self._field2module[line[0]] = line[1]
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def alter_size(self, column_name, column_type):
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self.cursor.execute('ALTER TABLE `%s` ' \
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'MODIFY COLUMN `%s` %s' % \
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(self.table_name, column_name,
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self._column_definition(column_name)))
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self._update_definitions()
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def alter_type(self, column_name, column_type):
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self.cursor.execute('ALTER TABLE `%s` ' \
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'MODIFY COLUMN `%s` %s' % \
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(self.table_name, column_name,
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self._column_definition(column_name, typname=column_type)))
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self._update_definitions()
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def db_default(self, column_name, value):
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self.cursor.execute('ALTER TABLE `%s` '
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'MODIFY COLUMN `%s` %s' % \
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(self.table_name, column_name,
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self._column_definition(column_name,
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default=value)))
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self._update_definitions()
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def add_raw_column(self, column_name, column_type, column_format,
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default_fun=None, field_size=None, migrate=True, string=''):
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if self.column_exist(column_name):
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if not migrate:
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return
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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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('bigint', 'double'),
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('int', 'bigint'),
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('tinyint', 'bool'),
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('decimal', '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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logging.getLogger('init').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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if field_size is None:
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if self._columns[column_name]['size'] != 255:
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self.alter_size(column_name, base_type)
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elif self._columns[column_name]['size'] == field_size:
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pass
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else:
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logging.getLogger('init').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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self._columns[column_name]['size'] > 0 and \
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self._columns[column_name]['size'] or 255,
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field_size))
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return
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column_type = column_type[1]
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self.cursor.execute('ALTER TABLE `%s` ADD COLUMN `%s` %s' %
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(self.table_name, column_name, column_type))
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if column_format:
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# check if table is non-empty:
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self.cursor.execute('SELECT 1 FROM `%s` limit 1' % self.table_name)
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if self.cursor.rowcount:
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# Populate column with default values:
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default = None
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if default_fun is not None:
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default = default_fun(self.cursor, 0, {})
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self.cursor.execute('UPDATE `' + self.table_name + '` '\
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'SET `' + column_name + '` = %s',
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(column_format(default),))
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self._update_definitions()
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def add_fk(self, column_name, reference, on_delete=None):
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if on_delete is None:
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on_delete = 'SET NULL'
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conname = '%s_%s_fkey' % (self.table_name, column_name)
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if conname in self._fkeys:
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self.drop_fk(column_name)
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self.cursor.execute('ALTER TABLE `%s` ' \
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'ADD CONSTRAINT `%s` FOREIGN KEY (`%s`) ' \
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'REFERENCES `%s` (id) ON DELETE %s' %
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(self.table_name, conname, column_name, reference, on_delete))
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self._update_definitions()
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def drop_fk(self, column_name, table=None):
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conname = '%s_%s_fkey' % (self.table_name, column_name)
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if conname not in self._fkeys:
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return
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self.cursor.execute('ALTER TABLE `%s` ' \
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'DROP FOREIGN KEY `%s`' % (self.table_name, conname))
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self._update_definitions()
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def index_action(self, column_name, action='add', table=None):
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if isinstance(column_name, basestring):
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column_name = [column_name]
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index_name = (table or self.table_name) + "_" + '_'.join(column_name) \
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+ "_index"
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for k in column_name:
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if k in self._columns:
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if self._columns[k]['typname'] in ('text', 'blob'):
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return
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if action == 'add':
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if index_name in self._indexes:
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return
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self.cursor.execute('CREATE INDEX `' + index_name + '` ' \
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'ON `' + self.table_name + '` ' \
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'( ' + \
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','.join(['`' + x + '`' for x in column_name]) + \
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')')
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self._update_definitions()
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elif action == 'remove':
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if len(column_name) == 1:
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if self._field2module.get(column_name[0], self.module_name) \
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!= self.module_name:
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return
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if index_name in self._indexes:
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self.cursor.execute('DROP INDEX `%s` ' % (index_name,))
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self._update_definitions()
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else:
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raise Exception('Index action not supported!')
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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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if action == 'add':
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if not self._columns[column_name]['nullable']:
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return
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self.cursor.execute('SELECT id FROM `%s` ' \
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'WHERE `%s` IS NULL' % \
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(self.table_name, column_name))
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if not self.cursor.rowcount:
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self.cursor.execute('ALTER TABLE `%s` ' \
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'MODIFY COLUMN `%s` %s' %
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(self.table_name, column_name,
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self._column_definition(column_name,
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nullable=False)))
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self._update_definitions()
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else:
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logging.getLogger('init').warning(
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'Unable to set column %s ' \
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'of table %s not null !\n'\
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'Try to re-run: ' \
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'trytond.py --update=module\n' \
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'If it doesn\'t work, update records ' \
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'and execute manually:\n' \
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'ALTER TABLE `%s` MODIFY COLUMN `%s` %s' % \
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(column_name, self.table_name, self.table_name,
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column_name, self._column_definition(column_name,
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nullable=False)))
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elif action == 'remove':
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if self._columns[column_name]['nullable']:
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return
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if self._field2module.get(column_name, self.module_name) \
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!= self.module_name:
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return
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self.cursor.execute('ALTER TABLE `%s` ' \
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'MODIFY COLUMN `%s` %s' %
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(self.table_name, column_name,
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self._column_definition(column_name, nullable=True)))
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self._update_definitions()
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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, exception=False):
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ident = self.table_name + "_" + ident
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if ident in self._constraints:
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# This constrain already exists
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return
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try:
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self.cursor.execute('ALTER TABLE `%s` ' \
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'ADD CONSTRAINT `%s` %s' % \
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(self.table_name, ident, constraint,))
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except:
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if exception:
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raise
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logging.getLogger('init').warning(
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'unable to add \'%s\' constraint on table %s !\n' \
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'If you want to have it, you should update the records ' \
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'and execute manually:\n'\
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'ALTER table `%s` ADD CONSTRAINT `%s` %s' % \
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(constraint, self.table_name, self.table_name,
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ident, constraint,))
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self._update_definitions()
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def drop_constraint(self, ident, exception=False, table=None):
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ident = (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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try:
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self.cursor.execute('ALTER TABLE `%s` ' \
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'DROP CONSTRAINT `%s`' % \
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(self.table_name, ident))
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except:
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if exception:
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raise
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logging.getLogger('init').warning(
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'unable to drop \'%s\' constraint on table %s!' % \
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(ident, self.table_name))
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self._update_definitions()
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def drop_column(self, column_name, exception=False):
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if not self.column_exist(column_name):
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return
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try:
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self.cursor.execute(
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'ALTER TABLE `%s` DROP COLUMN `%s`' %
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(self.table_name, column_name))
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except:
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if exception:
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raise
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logging.getLogger('init').warning(
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'unable to drop \'%s\' column on table %s!' % \
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(column_name, self.table_name))
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self._update_definitions()
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@staticmethod
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def drop_table(cursor, model, table, cascade=False):
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cursor.execute('DELETE from ir_model_data where '\
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'model = %s', model)
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query = 'DROP TABLE `%s`' % table
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if cascade:
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query = query + ' CASCADE'
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cursor.execute(query)
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def _column_definition(self, column_name, typname=None, nullable=None,
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size=None, default=None):
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if typname is None:
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typname = self._columns[column_name]['typname']
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if nullable is None:
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nullable = self._columns[column_name]['nullable']
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if size is None:
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size = self._columns[column_name]['size']
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if default is None:
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default = self._columns[column_name]['default']
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res = ''
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if typname == 'varchar':
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if int(size) > 255:
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size = 255
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res = 'varchar(%s)' % str(size)
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elif typname == 'decimal':
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res = 'decimal(65, 30)'
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elif typname == 'double':
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res = 'double(255, 15)'
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else:
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res = typname
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# Default value for timestamp doesn't work
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if typname == 'timestamp' and not nullable:
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nullable = True
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if nullable:
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res += ' NULL'
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else:
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res += ' NOT NULL'
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if default is not None:
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res += ' DEFAULT %s' % default
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return res
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