feat(Cmake/Database): separate database lib from common (#5334)

* feat(Core/Database): separate databse lib from common

* 1

src/server/database/Database/DatabaseWorker.cpp

@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>
+ * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/>
+ * Copyright (C) 2005-2009 MaNGOS <http://getmangos.com/>
+ */
+
+#include "DatabaseEnv.h"
+#include "DatabaseWorker.h"
+#include "SQLOperation.h"
+#include "MySQLConnection.h"
+#include "MySQLThreading.h"
+
+DatabaseWorker::DatabaseWorker(ACE_Activation_Queue* new_queue, MySQLConnection* con) :
+    m_queue(new_queue),
+    m_conn(con)
+{
+    /// Assign thread to task
+    activate();
+}
+
+int DatabaseWorker::svc()
+{
+    if (!m_queue)
+        return -1;
+
+    SQLOperation* request = nullptr;
+    while (1)
+    {
+        request = (SQLOperation*)(m_queue->dequeue());
+        if (!request)
+            break;
+
+        request->SetConnection(m_conn);
+        request->call();
+
+        delete request;
+    }
+
+    return 0;
+}