Add odb::connection class

This abstract class represents a connection to the database. One can
use it to start a transaction or to execute a native statement out
of a transaction.

Before we had concrete connection classes in the database runtime
libraries (e.g., odb::mysql::connection). Now these classes derive
from odb::connection.

1 files changed, 44 insertions, 0 deletions

diff --git a/odb/tracer/connection.hxx b/odb/tracer/connection.hxx
new file mode 100644
index 0000000..743bf92
--- /dev/null
+++ b/odb/tracer/connection.hxx
@@ -0,0 +1,44 @@
+// file      : odb/tracer/connection.hxx
+// author    : Boris Kolpackov <boris@codesynthesis.com>
+// copyright : Copyright (c) 2009-2011 Code Synthesis Tools CC
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef ODB_TRACER_CONNECTION_HXX
+#define ODB_TRACER_CONNECTION_HXX
+
+#include <odb/pre.hxx>
+
+#include <odb/connection.hxx>
+#include <odb/details/shared-ptr.hxx>
+
+#include <odb/tracer/transaction-impl.hxx>
+#include <odb/tracer/details/export.hxx>
+
+namespace odb
+{
+  namespace tracer
+  {
+    class database;
+
+    class connection;
+    typedef details::shared_ptr<connection> connection_ptr;
+
+    class LIBODB_TRACER_EXPORT connection: public odb::connection
+    {
+    public:
+      typedef tracer::database database_type;
+
+      connection (database_type&);
+
+      virtual unsigned long long
+      execute (const char* statement, std::size_t length);
+
+      virtual transaction_impl*
+      begin ();
+    };
+  }
+}
+
+#include <odb/post.hxx>
+
+#endif // ODB_TRACER_CONNECTION_HXX