#pragma once
#include <string>
#include <tchar.h>

#ifndef UNICODE 
	#define QueryText QueryTextA
	#define toText toTextA
#else
	#define QueryText QueryTextW
	#define toText toTextW
#endif

#ifdef DLL_EXPORT
#define TSQLITEAPI __declspec(dllexport)
#else
#define TSQLITEAPI
#endif // TSQLITE_DLL



struct sqlite3;
struct sqlite3_stmt;
typedef struct Mem sqlite3_value;

class TSQLITEAPI TSQLite
{
public:
	TSQLite();
	~TSQLite();

public:
	enum TSQLITE
	{
		eINTEGER = 0,
		eFLOAT,
		eBLOB,
		eNULL,
		eTEXT,
		eSQLITE_ROW,
		eNONE,
	};

public:
	class TSQLITEAPI TValue
	{
	public:
		TValue(sqlite3_value *p) : m_pV(p){}
	public:
		// 如果 pBuffer 为 NULL，则 返回的是所需内存的长度
		int toBlob(void *pBuffer, const int &len);
		int toInt();
		__int64 toInt64();
		double toDouble();
		std::string toTextA();
		std::wstring toTextW();
		TSQLITE getType();
	private:
		sqlite3_value *m_pV;
	};

public:
	static std::string unicode2utf8(const wchar_t *psz);
	static std::wstring utf82unicode(const char *psz);
	static std::string utf82OEM(const char *psz);

public:
	bool open(const TCHAR *filename);

	bool close();

	bool prepare(const TCHAR *sql);

	bool exec(const TCHAR *sql);

	TSQLITE oneStep();

	TValue query(int iCol);

	int countOfCloumn();

	std::string getErrMsg();

	void beginTrans();

	void commitTrans();

	void rollbackTrans();

private:
	sqlite3 *m_pSQLite;
	sqlite3_stmt *m_pStmt;
	std::string m_sErr;
};