Re: [ANN] ODB - compiler-based ORM system for C++

"Jim Langston" <>
Wed, 29 Sep 2010 13:34:05 -0700
Comments in line.

"Boris Kolpackov" <> wrote in message


ODB is an open-source, compiler-based object-relational mapping (ORM)
system for C++. It allows you to persist C++ objects to a relational
database without having to deal with tables, columns, or SQL and
without manually writing any mapping code.

I had tried to come up with a solution for this a few years ago but didn't
get very far because of c++'s limitations.

For example:

 #pragma db object
 class person

   friend class odb::access;
   person ();

   #pragma db id auto
   unsigned long id_;

   string first_;
   string last_;
   unsigned short age_;


The C++ code that performs the conversion between persistent classes
and their database representation is automatically generated by the
ODB compiler. The ODB compiler is a real C++ compiler except that it
produces C++ instead of assembly or machine code. In particular, it is
not an ad-hoc header pre-processor that is only capable of recognizing
a subset of C++. ODB is capable of handling any standard C++ code.

This is not a solution I would of come up with, and I'm not sure how much I
like it. This solution is limiting me to a specific compiler which means a
few things.

1. This is not standard C++ if it requires a special compiler to compile
2. If this is used I am locking myself into a specific compiler and perhaps
even platform
3. Very nice try, but I wouldn't use it. Try again? A solution is needed,
I'm just not sure this is the right one.


Jim Langston

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