Now use ZODB.utils.z64 instead of '\0\0\0\0\0\0\0\0' where appropriate

src/ZODB/BaseStorage.py

@@ -25,6 +25,7 @@ import POSException
 from persistent.TimeStamp import TimeStamp
 
 from ZODB import POSException, utils
+from ZODB.utils import z64
 from ZODB.UndoLogCompatible import UndoLogCompatible
 
 log = logging.getLogger("ZODB.BaseStorage")
@@ -98,7 +99,7 @@ class BaseStorage(UndoLogCompatible):
         t=self._ts=apply(TimeStamp,(time.gmtime(t)[:5]+(t%60,)))
         self._tid = `t`
         if base is None:
-            self._oid='\0\0\0\0\0\0\0\0'
+            self._oid=z64
         else:
             self._oid=base._oid
 

src/ZODB/DB.py

@@ -22,6 +22,7 @@ import warnings
 import logging
 
 from ZODB.broken import find_global
+from ZODB.utils import z64
 from ZODB.Connection import Connection
 from ZODB.serialize import referencesf
 
@@ -124,7 +125,7 @@ class DB(object):
         if not hasattr(storage,'tpc_vote'):
             storage.tpc_vote = lambda *args: None
         try:
-            storage.load('\0\0\0\0\0\0\0\0','')
+            storage.load(z64,'')
         except KeyError:
             # Create the database's root in the storage if it doesn't exist
             from persistent.mapping import PersistentMapping
@@ -138,7 +139,7 @@ class DB(object):
             t = transaction.Transaction()
             t.description = 'initial database creation'
             storage.tpc_begin(t)
-            storage.store('\0\0\0\0\0\0\0\0', None, file.getvalue(), '', t)
+            storage.store(z64, None, file.getvalue(), '', t)
             storage.tpc_vote(t)
             storage.tpc_finish(t)
 

src/ZODB/DemoStorage.py

@@ -82,6 +82,7 @@ and call it to monitor the storage.
 
 import base64, time, string
 from ZODB import POSException, BaseStorage, utils
+from ZODB.utils import z64
 from persistent.TimeStamp import TimeStamp
 from cPickle import loads
 from BTrees import OOBTree
@@ -409,7 +410,7 @@ class DemoStorage(BaseStorage.BaseStorage):
 
             # Now build an index of *only* those objects reachable
             # from the root.
-            rootl = ['\0\0\0\0\0\0\0\0']
+            rootl = [z64]
             pindex = {}
             while rootl:
                 oid = rootl.pop()

src/ZODB/MappingStorage.py

@@ -21,7 +21,7 @@ It is meant to illustrate the simplest possible storage.
 The Mapping storage uses a single data structure to map object ids to data.
 """
 
-from ZODB import utils
+from ZODB.utils import u64, z64
 from ZODB import BaseStorage
 from ZODB import POSException
 from persistent.TimeStamp import TimeStamp
@@ -115,7 +115,7 @@ class MappingStorage(BaseStorage.BaseStorage):
             if not self._index:
                 return
             # Build an index of *only* those objects reachable from the root.
-            rootl = ['\0\0\0\0\0\0\0\0']
+            rootl = [z64]
             pindex = {}
             while rootl:
                 oid = rootl.pop()
@@ -144,6 +144,6 @@ class MappingStorage(BaseStorage.BaseStorage):
         for oid in keys:
             r = self._index[oid]
             o.append('  %s: %s, %s' %
-                     (utils.u64(oid),TimeStamp(r[:8]),`r[8:]`))
+                     (u64(oid),TimeStamp(r[:8]),`r[8:]`))
 
         return '\n'.join(o)

src/ZODB/dbmStorage.py

@@ -19,6 +19,8 @@ objects like hit counters that don't need or want to participate
 in undo or versions.
 """
 
+from ZODB.utils import z64
+
 from MappingStorage import MappingStorage
 from BaseStorage import BaseStorage
 import anydbm, os
@@ -56,7 +58,7 @@ class gdbmStorage(anydbmStorage):
         self._index=index=gdbm.open(filename, flag[:1]+'f', mode)
         self._tindex=[]
 
-        m='\0\0\0\0\0\0\0\0'
+        m=z64
         oid=index.firstkey()
         while oid != None:
             m=max(m, oid)
@@ -76,7 +78,7 @@ class gdbmStorage(anydbmStorage):
             # Build an index of *only* those objects reachable
             # from the root.
             index=self._index
-            rootl=['\0\0\0\0\0\0\0\0']
+            rootl=[z64]
             pop=rootl.pop
             pindex={}
             referenced=pindex.has_key