Implement support for database operations callbacks

New object pragma: callback. New test: common/callback. New manual
section: 10.1.4, "callback".

1 files changed, 160 insertions, 0 deletions

diff --git a/common/callback/driver.cxx b/common/callback/driver.cxx
new file mode 100644
index 0000000..2934737
--- /dev/null
+++ b/common/callback/driver.cxx
@@ -0,0 +1,160 @@
+// file      : common/callback/driver.cxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+// Test database operation callbacks.
+//
+
+#include <memory>   // std::auto_ptr
+#include <cassert>
+#include <iostream>
+
+#include <odb/database.hxx>
+#include <odb/transaction.hxx>
+
+#include <common/common.hxx>
+
+#include "test.hxx"
+#include "test-odb.hxx"
+
+using namespace std;
+using namespace odb::core;
+
+const char* events[] =
+{
+  "pre_persist",
+  "post_persist",
+  "pre_load",
+  "post_load",
+  "pre_update",
+  "post_update",
+  "pre_erase",
+  "post_erase"
+};
+
+void object::
+db_callback (callback_event e, database&)
+{
+  cout << "  " << events[e] << " " << id_ << endl;
+}
+
+void object::
+db_callback (callback_event e, database&) const
+{
+  cout << "  " << events[e] << " " << id_ << " const" << endl;
+}
+
+int
+main (int argc, char* argv[])
+{
+  try
+  {
+    auto_ptr<database> db (create_database (argc, argv));
+
+    // Persist.
+    //
+    cout << "persist" << endl;
+    {
+      object o1 (1, 1);
+      object const o2 (2, 2);
+      transaction t (db->begin ());
+      db->persist (o1);
+      db->persist (&o2);
+      t.commit ();
+    }
+    cout << "***" << endl;
+
+    // Load.
+    //
+    cout << "load" << endl;
+    {
+      transaction t (db->begin ());
+      auto_ptr<object> o1 (db->load<object> (1));
+      object o2;
+      db->load<object> (2, o2);
+      t.commit ();
+    }
+    cout << "***" << endl;
+
+    // Query.
+    //
+    cout << "query" << endl;
+    {
+      typedef odb::query<object> query;
+      typedef odb::result<object> result;
+
+      transaction t (db->begin ());
+      result r (db->query<object> (query::id < 3));
+
+      for (result::iterator i (r.begin ()); i != r.end (); ++i)
+      {
+        if (i->id_ > 3) // Load.
+          break;
+      }
+
+      t.commit ();
+    }
+    cout << "***" << endl;
+
+    // Update.
+    //
+    cout << "update" << endl;
+    {
+      transaction t (db->begin ());
+      auto_ptr<object> o1 (db->load<object> (1));
+      auto_ptr<object> o2 (db->load<object> (2));
+      o1->data++;
+      o2->data++;
+      db->update (o1.get ());
+      db->update (static_cast<object const&> (*o2));
+      t.commit ();
+    }
+    cout << "***" << endl;
+
+    // Erase.
+    //
+    cout << "erase" << endl;
+    {
+      transaction t (db->begin ());
+      auto_ptr<object> o1 (db->load<object> (1));
+      auto_ptr<object> o2 (db->load<object> (2));
+      db->erase (static_cast<object const*> (o1.get ()));
+      db->erase (*o2);
+      t.commit ();
+    }
+    cout << "***" << endl;
+
+    // Delayed (recursive) load.
+    //
+    cout << "delayed load" << endl;
+    {
+      {
+        object o1 (1, 1);
+        object o2 (2, 2);
+        object o3 (3, 2);
+
+        o1.pobj = &o2;
+        o2.pobj = &o3;
+
+        transaction t (db->begin ());
+        db->persist (o1);
+        db->persist (o2);
+        db->persist (o3);
+        t.commit ();
+      }
+
+      {
+        transaction t (db->begin ());
+        auto_ptr<object> o1 (db->load<object> (1));
+        t.commit ();
+      }
+    }
+    cout << "***" << endl;
+  }
+  catch (const odb::exception& e)
+  {
+    cerr << e.what () << endl;
+    return 1;
+  }
+}