[odb-users] Including a custom object field member in the persistence class

[Myoungkyu Song]

# ODB version: 1.0.0
# OS: Linux 2.6.32-26-generic-Ubuntu
# Compiler: g++ (Ubuntu 4.4.3-4ubuntu5) 4.4.3

Hi, Boris and odb-users

When it comes to including a custom object field member in the persistence
class, the ODB-Example package mentioned in the ODB Manual, specifically the
mapping example, demonstrates how to specify the additional source file,
"traits.hxx" for the ODB compiler, in order to provide the mapping to the DB
system type. However, I have gotten the following errors related to the
odb-runtime libraries.
===================================================================
time g++ -g -I/home/smk/x10_2.1.0/include -I/home/smk/workspace/x10test1 -I.
-Wno-long-long -Wno-unused-parameter -pthread -msse2 -mfpmath=sse
-L/usr/local/lib -L/usr/local/lib/mysql -lodb -lodb-mysql -c dbtrax.cc -o
dbtrax.o
dbtrax.cc: In function ‘void makePersistence(StringRef)’:
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
dbtrax.cc:25: warning: deprecated conversion from string constant to ‘char*’
In file included from /usr/local/include/odb/database.hxx:13,
                from dbtrax.cc:8:
/usr/local/include/odb/traits.hxx: At global scope:
/usr/local/include/odb/traits.hxx: In instantiation of
‘odb::object_traits<x10aux::ref<x10::lang::String> >’:
dbtrax.cc:31:   instantiated from here
/usr/local/include/odb/traits.hxx:81: error: invalid use of incomplete type
‘struct odb::access::object_traits<x10aux::ref<x10::lang::String> >’
/usr/local/include/odb/forward.hxx:23: error: declaration of ‘struct
odb::access::object_traits<x10aux::ref<x10::lang::String> >’
/usr/local/include/odb/traits.hxx:84: error: invalid use of incomplete type
‘struct odb::access::object_traits<x10aux::ref<x10::lang::String> >’
/usr/local/include/odb/forward.hxx:23: error: declaration of ‘struct
odb::access::object_traits<x10aux::ref<x10::lang::String> >’
dbtrax.cc: In function ‘void makePersistence(StringRef)’:
dbtrax.cc:31: error: no matching function for call to
‘odb::database::persist(StringRef&)’
Command exited with non-zero status 1
1.68user 0.09system 0:01.77elapsed 100%CPU (0avgtext+0avgdata
288352maxresident)k
0inputs+8outputs (0major+18353minor)pagefaults 0swaps
make: *** [dbtrax.o] Error 1
root at smk-laptop:/home/smk/workspace/x10test1#
=========================================================

So, do I need to carry out any additional work? For example, I saw the
comments below in another "traits.hxx" for specialization. Would you be able
to provide the related example? The example package does not offer the
corresponding example.

 // template <typename T>
 // class access::object_traits;
 //
 // Specializations should inherit from object_memory, object_factory
 // and define the following members:
 //
 // id_type               - object id (primary key) type
 // id_type id (const T&) - get object id
 //
 // void persist (database&, T&)
 // void update (database&, T&)
 // void erase (database&, const id_type&)
 // pointer_type find (database&, const id_type&)
 // bool find (database&, const id_type&, T&)
 //

Best regards,
Myoungkyu Song
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