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diff --git a/odb-tests/libcommon/concrete.hxx b/odb-tests/libcommon/concrete.hxx
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+++ b/odb-tests/libcommon/concrete.hxx
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+// file      : libcommon/concrete.hxx
+// license   : GNU GPL v2; see accompanying LICENSE file
+
+#ifndef LIBCOMMON_CONCRETE_HXX
+#define LIBCOMMON_CONCRETE_HXX
+
+#include <libcommon/config.hxx>
+
+// Namespace alias for the concrete database namespace.
+//
+#if defined(MULTI_DATABASE)
+
+// Fallback to common interface.
+//
+#include <odb/database.hxx>
+#include <odb/transaction.hxx>
+
+namespace odb_db = odb;
+
+#elif defined(DATABASE_MYSQL)
+
+#include <odb/mysql/database.hxx>
+#include <odb/mysql/transaction.hxx>
+
+namespace odb_db = odb::mysql;
+
+#elif defined(DATABASE_SQLITE)
+
+#include <odb/sqlite/database.hxx>
+#include <odb/sqlite/transaction.hxx>
+
+namespace odb_db = odb::sqlite;
+
+#elif defined(DATABASE_PGSQL)
+
+#include <odb/pgsql/database.hxx>
+#include <odb/pgsql/transaction.hxx>
+
+namespace odb_db = odb::pgsql;
+
+#elif defined(DATABASE_ORACLE)
+
+#include <odb/oracle/database.hxx>
+#include <odb/oracle/transaction.hxx>
+
+namespace odb_db = odb::oracle;
+
+#elif defined(DATABASE_MSSQL)
+
+#include <odb/mssql/database.hxx>
+#include <odb/mssql/transaction.hxx>
+
+namespace odb_db = odb::mssql;
+
+#endif
+
+#endif // LIBCOMMON_CONCRETE_HXX