/*
 * This file is a part of Winix
 * and is not publicly distributed
 * 
 * Copyright (c) 2010, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#ifndef headerfile_winix_db_dbbase
#define headerfile_winix_db_dbbase


#include "dbconn.h"
#include "dbtextstream.h"
#include <vector>
#include <string>
#include "core/error.h"


class DbBase
{
public:

	DbBase();

	void SetConn(DbConn * conn);
	void SetConn(DbConn & conn);
	DbConn * GetConn();

	void LogQueries(bool log_q);

	PGresult * AssertQuery(const char * query);
	PGresult * AssertQuery(const std::wstring & query);
	PGresult * AssertQuery(const DbTextStream & query);
	void AssertResult(PGresult * r, ExecStatusType t);
	static int AssertColumn(PGresult * r, const char * column_name);

	static const char *  AssertValue(PGresult * r, int row, int col);
	static const std::wstring & AssertValueWide(PGresult * r, int row, int col); // warning: this method uses a static buffer
	static void          AssertValueWide(PGresult * r, int row, int col, std::wstring & result);
	static long          AssertValueLong(PGresult * r, int row, int col);
	static int           AssertValueInt(PGresult * r, int row, int col);
	static bool          AssertValueBool(PGresult * r, int row, int col);
	static unsigned long AssertValueULong(PGresult * r, int row, int col);
	static unsigned int  AssertValueUInt(PGresult * r, int row, int col);
	static tm            AssertValueTm(PGresult * r, int row, int col);

	void ClearResult(PGresult * r);
	long AssertCurrval(const char * table);

	bool IsNull(PGresult * r, int row, int col);
	int Rows(PGresult * r);
	int Cols(PGresult * r);
	long AffectedRows(PGresult * r);

	static tm ConvertTime(const char * str);
	static const char * ConvertTime(const tm & t); // warning: it uses its own static buffer
	void CreateIdList(const std::vector<long> & id_tab, std::wstring & list, bool add_parentheses = true);

	Error DoCommand(const char * command);
	Error BeginTrans();
	Error RollbackTrans();
	Error CommitTrans();

protected:

	// a helper method for escaping strings
	template<class RawType>
	DbTextStream::RawText<RawType> R(const RawType & par)
	{
		return DbTextStream::RawText<RawType>(par);
	}

	DbConn * db_conn;
	bool log_queries;

private:

	DbTextStream bquery;


};




#endif