##############################################################################
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# Zope Public License (ZPL) Version 1.0
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database_type='MySQL'
__doc__='''%s Database Connection

$Id: DA.py,v 1.4 2001/08/09 20:16:36 adustman Exp $''' % database_type
__version__='$Revision: 1.4 $'[11:-2]

import os
from db import ThreadedDB
import Shared.DC.ZRDB.Connection, sys, DABase
from App.Dialogs import MessageDialog
from App.special_dtml import HTMLFile
from App.ImageFile import ImageFile
from ExtensionClass import Base
from DateTime import DateTime
from thread import allocate_lock

manage_addZMySQLConnectionForm=HTMLFile('connectionAdd',globals())

def manage_addZMySQLConnection(self, id, title,
                                connection_string,
                                check=None, REQUEST=None):
    """Add a DB connection to a folder"""
    self._setObject(id, Connection(id, title, connection_string, check))
    if REQUEST is not None: return self.manage_main(self,REQUEST)

# Connection Pool for connections to MySQL.
database_connection_pool_lock = allocate_lock()
database_connection_pool = {}

class Connection(DABase.Connection):
    " "
    database_type=database_type
    id='%s_database_connection' % database_type
    meta_type=title='Z %s Database Connection' % database_type
    icon='misc_/Z%sDA/conn' % database_type

    manage_properties=HTMLFile('connectionEdit', globals())

    def factory(self): return ThreadedDB

    def connect(self, s):
      try:
        database_connection_pool_lock.acquire()
        self._v_connected = ''
        pool_key = self.getPhysicalPath()
        connection = database_connection_pool.get(pool_key)
        if connection is not None and connection._connection == s:
          self._v_database_connection = connection
        else:
          if connection is not None:
            connection.closeConnection()
          ThreadedDB = self.factory()
          database_connection_pool[pool_key] = ThreadedDB(s)
          self._v_database_connection = database_connection_pool[pool_key]
        # XXX If date is used as such, it can be wrong because an existing
        # connection may be reused. But this is suposedly only used as a
        # marker to know if connection was successfull.
        self._v_connected = DateTime()
      finally:
        database_connection_pool_lock.release()
      return self

    def sql_quote__(self, v, escapes={}):
        return self._v_database_connection.string_literal(v)


classes=('DA.Connection',)

meta_types=(
    {'name':'Z %s Database Connection' % database_type,
     'action':'manage_addZ%sConnectionForm' % database_type,
     },
    )

folder_methods={
    'manage_addZMySQLConnection':
    manage_addZMySQLConnection,
    'manage_addZMySQLConnectionForm':
    manage_addZMySQLConnectionForm,
    }

__ac_permissions__=(
    ('Add Z MySQL Database Connections',
     ('manage_addZMySQLConnectionForm',
      'manage_addZMySQLConnection')),
    )

misc_={'conn': ImageFile(
    os.path.join('Shared','DC','ZRDB','www','DBAdapterFolder_icon.gif'))}

for icon in ('table', 'view', 'stable', 'what',
	     'field', 'text','bin','int','float',
	     'date','time','datetime'):
    misc_[icon]=ImageFile(os.path.join('icons','%s.gif') % icon, globals())
