added: TextStream a class similar to std::ostringstream

but with a Clear() method
       the dynamic allocated buffer can be easily reused
added: DbTextStream a special version of a stream
       used to create a database string query
       everything is escaped by default
added: DbBase a base class with some basic methods for communicating
       with the database
added: DbConn a class for managing connection to the database
changed: some refactoring in Db class       



git-svn-id: svn://ttmath.org/publicrep/winix/trunk@655 e52654a7-88a9-db11-a3e9-0013d4bc506e

db/dbconn.h

@@ -0,0 +1,55 @@
+/*
+ * This file is a part of Winix
+ * and is not publicly distributed
+ * 
+ * Copyright (c) 2010, Tomasz Sowa
+ * All rights reserved.
+ * 
+ */
+ 
+#ifndef headerfile_winix_db_dbconn
+#define headerfile_winix_db_dbconn
+
+#include <string>
+#include <libpq-fe.h>
+#include "dbtextstream.h"
+
+
+
+
+class DbConn
+{
+public:
+
+	DbConn();
+	~DbConn();
+
+	void SetConnParam(const std::string & database, const std::string & user, const std::string & pass);
+	void Connect();
+	void WaitForConnection();
+	void Close();
+	bool AssertConnection(bool put_log = true, bool throw_if_no_connection = true);
+	void SetDbParameters();
+	PGconn * GetPgConn();
+
+private:
+
+	void LogConnectionSocket();
+
+	PGconn * pg_conn;
+	std::string db_database, db_user, db_pass;
+	DbTextStream conn_info;
+
+	// a helper method for escaping strings
+	template<class RawType>
+	DbTextStream::RawText<RawType> R(const RawType & par)
+	{
+		return DbTextStream::RawText<RawType>(par);
+	}
+};
+
+
+
+
+#endif
+