[Zope-dev] Now; - problems using ZODB/ZCatalog in Python

[Jens Vagelpohl]

thomas,

this error message is raised when the zope instance that contains the
ZODB you're trying to work with is already running (and thereby put its
own lock on the ZODB). are you trying to execute this script while zope
is running? you need to shut it down first.

jens


> -----Original Message-----
> From: zope-dev-admin@zope.org 
> [mailto:zope-dev-admin@zope.org]On Behalf
> Of Thomas Weholt
> Sent: Tuesday, July 25, 2000 06:34
> To: 'Zope-Dev@zope.org'
> Subject: [Zope-dev] Now; - problems using ZODB/ZCatalog in Python
> 
> I understand the error message, just don't why it is raised. 
> If I should
> call some form of commit() or close(), where should this be done?
> 
> And, by the way, does Catalog support different kinds of 
> searches, like
> matching all the search-words, some, does the order count ? 
> Can this options
> be set, if any exists?
> 
> Anyway, thanks for your patience and bandwidth.
> Thomas
> 
> import sys
> sys.path.append('d:\\progra~1\\website\\lib\\python\\')
> import ZODB
> import Persistence
> from Persistence import Persistent
> from ZODB.FileStorage import FileStorage
> from Products.ZCatalog.Catalog import Catalog
> 
> ### create some classes to be persistent
> class Nobody( Persistent ):
>     def identify( self ):
>         print "I am Nobody!"
>         
> class Person( Persistent ):
>     def __init__( self, first, name, email, friend=Nobody() ):
>         self.first = first
>         self.name  = name
>         self.email = email
>         self.friend= friend
>     def identify( self ):
>         print "I am " + self.first + " " + self.name
>         print "and my Email is " + self.email
> 
> ### OK, the ZODB-API together with a Catalog-Class
> class Application:
>     def __init__( self, file='test.fs' ):
>         self.file= file
>         self.db  = ZODB.DB( FileStorage( file ) )
>         self.co  = self.db.open()
>         self.root= self.co.root()
>         if self.root.has_key( 'cat' ):
>             self.cat= self.root['cat']
>         else:
>             self.cat        = Catalog()
> ### This is, how I get it to work
>             self.cat.aq_parent= self.root
>             
> 	    self.root['cat']= self.cat
>            
> ### Add indexes to the Catalog-Class
> ### The names must match the fields of the Person-Class!
>             self.cat.addIndex('first','FieldIndex' )
>             self.cat.addIndex('name' ,'FieldIndex' )
>             self.cat.addIndex('email','FieldIndex' )
>             get_transaction().commit()
>             
>     def storePerson( self, person ):
>         uid= id( person )
>         print "stored as " + str( uid )
>         self.root[uid]= person
> 
> ### Let the Catalog know from this object
>         self.cat.catalogObject( person, uid )
>         get_transaction().commit()
>         
>     def searchPerson( self, **kw ):
>         r= self.cat.searchResults( kw )
>         paths= self.cat.paths
>         root = self.root
>         k= []
>         for i in r:
>             id= i.data_record_id_
>             k.append( root[paths[id]] )
>         return k
> 
> if __name__ == '__main__':
>     a= Application()
>     p1= Person( 'marian','kelc','marian.kelc@ruhr-uni-bochum.de' )
>     p2= Person( 'tanja', 'kreierhoff','tanja.kreierhoff@web.de', p1 )
>     p1.friend= p2
>     a.storePerson( p1 )
>     a.storePerson( p2 )
> 
>     ### test2.py
>     a= Application()
> 
>     ### perform searches with keyword-arguments
>     ids= a.searchPerson( name='kelc' )
> 
>     for i in ids:
>         i.identify()
>         print "Friend is:"
>         i.friend.identify()
>         i.friend.friend.identify()
>         print str( id( i ) )
>         print str( id( i.friend.friend ) )
> 
> stored as 24111488
> stored as 16520248
> Traceback (innermost last):
>   File "D:\Program 
> Files\Python\Pythonwin\pywin\framework\scriptutils.py",
> line 307, in RunScript
>     debugger.run(codeObject, __main__.__dict__, start_stepping=0)
>   File "D:\Program 
> Files\Python\Pythonwin\pywin\debugger\__init__.py", line
> 71, in run
>     _GetCurrentDebugger().run(cmd, globals,locals, start_stepping)
>   File "D:\Program 
> Files\Python\Pythonwin\pywin\debugger\debugger.py", line
> 533, in run
>     _doexec(cmd, globals, locals)
>   File "D:\Program 
> Files\Python\Pythonwin\pywin\debugger\debugger.py", line
> 868, in _doexec
>     exec cmd in globals, locals
>   File "D:\python\life\zodb_zcatalog.py", line 84, in ?
>     a= Application()
>   File "D:\python\life\zodb_zcatalog.py", line 28, in __init__
>     self.db  = ZODB.DB( FileStorage( file ) )
>   File "D:\PROGRA~1\WebSite\lib\python\ZODB\FileStorage.py", 
> line 262, in
> __init__
>     lock_file(f)
>   File "D:\PROGRA~1\WebSite\lib\python\ZODB\lock_file.py", 
> line 115, in
> lock_file
>     raise error, (
> StorageSystemError: Could not lock the database file.  There must be
> another process that has opened the file.
> <p>
>