I'd like to use object database to persist some classes created in IronPython. The database is db4o for .NET 2.0 (downloaded today). The code looks like this:
import clr
clr.AddReferenceToFileAndPath(r"C:\dev\Db4objects\db4o-7.12-net20\bin\net-2.0\Db4objects.Db4o.dll")
from Db4objects.Db4o import *
db = Db4oFactory.OpenFile(r'G:\IronPython\test\db4o\database.db')
class Person(object):
def __init__(self, name, age):
self.Name = name
self.Age = age
def __str__(self):
return 'Person: ' + self.Name + ' ' + str(self.Age)
p1 = Person('testp', 34)
db.Store(p1)
I get exception at db.Store(p1)
Unexpected char '$'
ThrowUncheckedException at offset 4 in file:line:column <filename unknown>:0:0
FatalShutdown at offset 136 in file:line:column <filename unknown>:0:0
AsTopLevelCall at offset 112 in file:line:column <filename unknown>:0:0
AsTopLevelStore at offset 34 in file:line:column <filename unknown>:0:0
StoreInternal at offset 69 in file:line:column <filename unknown>:0:0
Store at offset 66 in file:line:column <filename unknown>:0:0
Store at offset 12 in file:line:column <filename unknown>:0:0
Store at offset 15 in file:line:column <filename unknown>:0:0
v Microsoft.Scripting.Actions.Calls.MethodCandidate.Caller.CallWithInstance(Object[] args, Boolean& shouldOptimize)
v IronPython.Runtime.Types.BuiltinFunction.BuiltinMethodCaller`2.Call1(CallSite site, CodeContext context, TFuncType
func, T0 arg0)
v System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
v Microsoft.Scripting.Interpreter.DynamicInstruction`4.Run(InterpretedFrame frame)
v Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
v Microsoft.Scripting.Interpreter.LightLambda.Run2[T0,T1,TRet](T0 arg0, T1 arg1)
v IronPython.Compiler.PythonScriptCode.RunWorker(CodeContext ctx)
v IronPython.Compiler.PythonScriptCode.Run(Scope scope)
v IronPython.Hosting.PythonCommandLine.<>c__DisplayClass1.<RunOneInteraction>b__0()
Exception: Unexpected char '$'
CLR Exception:
Exception
:
Unexpected char '$'
I suspect that the problem is with IronPython and its type system, because the class Person
is not standard .NET class. I tried to persist System.IO.FileInfo
and it worked well. How can I store an object that is instance of a class in IronPython?