C++ and Object Databases

This example uses the ODMG C++ Binding and the ODMG Object Query Language (OQL). Other C++ bindings and query languages for object databases would be similar. Notice that all the code is C++, with the exception of the query string. You will not find a database sub-language in this example. The part in blue relates to the animation of transparent persistence. More information on the ODMG specification. Note that the same code would used for object-relational mapping products. Transparent persistent interfaces work with both object database or object-relational mapping products.

d_Database db;
d_Transaction txn;

try {
    db.open("addressDB");
    txn.begin();

    // perform query
     d_OQL_Query query(
         "select x from Person x where x.name = \"Doug Barry\"");
    d_Bag<d_Ref<Person> >   allDougBarrys;
    d_oql_execute(query, allDougBarrys);
    d_Iterator<d_Ref<Person> > iter = allDougBarrys.create_iterator();

    // iterate over the results
    d_Ref<Person> p;
    while( iter.next(p) ){

       // do some addition processing on the person (not shown)

       // now traverse to the address object and update its value
       p->address.street = "13504 4th Avenue South";
    }

    txn.commit();
    db.close();
}

//exception handling would go here ...

Context for C++ and Object Databases

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