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diff --git a/qt/employee.hxx b/qt/employee.hxx
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+// file      : qt/employee.hxx
+// author    : Constantin Michael <constantin@codesynthesis.com>
+// copyright : not copyrighted - public domain
+
+#ifndef EMPLOYEE_HXX
+#define EMPLOYEE_HXX
+
+#include <vector>
+
+#include <QString>
+#include <QByteArray>
+#include <QDateTime>
+
+#include <odb/core.hxx>
+
+// Include TR1 <memory> header in a compiler-specific fashion. Fall back
+// on the Boost implementation if the compiler does not support TR1.
+//
+#include <odb/tr1/memory.hxx>
+
+#include <odb/tr1/lazy-ptr.hxx>
+
+using std::tr1::shared_ptr;
+
+using odb::tr1::lazy_shared_ptr;
+using odb::tr1::lazy_weak_ptr;
+
+// Forward declarations.
+//
+class employer;
+class employee;
+
+typedef std::vector<lazy_weak_ptr<employee> > employees;
+
+#pragma db object
+class employer
+{
+public:
+  employer (const QString& name)
+      : name_ (name)
+  {
+  }
+
+  const QString&
+  name () const
+  {
+    return name_;
+  }
+
+  // Employees of this employer.
+  //
+  typedef ::employees employees_type;
+
+  const employees_type&
+  employees () const
+  {
+    return employees_;
+  }
+
+  employees_type&
+  employees ()
+  {
+    return employees_;
+  }
+
+private:
+  friend class odb::access;
+
+  employer () {}
+
+  #pragma db id
+  QString name_;
+
+  #pragma db not_null inverse(employer_)
+  employees_type employees_;
+};
+
+#pragma db object
+class employee
+{
+public:
+  typedef ::employer employer_type;
+
+  employee (const QString& first,
+            const QString& last,
+            const QDate& born,
+            const QByteArray& public_key,
+            shared_ptr<employer_type> employer)
+      : first_ (first), last_ (last), born_(born), public_key_(public_key),
+        employer_ (employer)
+  {
+  }
+
+  // Name.
+  //
+  const QString&
+  first () const
+  {
+    return first_;
+  }
+
+  const QString&
+  last () const
+  {
+    return last_;
+  }
+
+  // Date of birth.
+  //
+  const QDate&
+  born () const
+  {
+    return born_;
+  }
+
+  // Public key.
+  //
+  const QByteArray&
+  public_key () const
+  {
+    return public_key_;
+  }
+
+  // Employer.
+  //
+  lazy_shared_ptr<employer_type>
+  employer () const
+  {
+    return employer_;
+  }
+
+  void
+  employer (shared_ptr<employer_type> employer)
+  {
+    employer_ = employer;
+  }
+
+private:
+  friend class odb::access;
+
+  employee () {}
+
+  #pragma db id auto
+  unsigned long id_;
+
+  QString first_;
+  QString last_;
+
+  QDate born_;
+
+  QByteArray public_key_;
+
+  #pragma db not_null
+  lazy_shared_ptr<employer_type> employer_;
+};
+
+#endif // EMPLOYEE_HXX