C++ 使用SQLite

1.SQLite是一个完全独立的、不需要服务器、不要任何配置、支持SQL的、开源的文件数据库引擎。源代码和支持可以登录：http://www.sqlite.org/ 
  1.1.下载sqlite3.dll和sqlite3.def文件，在下载页下载sqlite-dll-win32-x86-3080803文件

1.2.下载sqlite3.h，在下载页下载sqlite-amalgamation-201503091040文件。

2.代码编译，由于SQLite下载文件中只提供了def文件而没有提供lib文件。所以在正式使用sqlite之前需要先编译lib文件。下面给出编译lib文件的方法和步骤。

2.1 打开VS自带的命令行工具。

2.2在上面的命令行中输入（注意空格）：（小技巧，输入lib.exe  /def：后可以将刚刚解压sqlite3.def直接拖到命令行界面中，然后加上/machine：ix86）

D:\Program Files\Microsoft Visual Studio 10.0\VC>lib.exe /def:F:\TDdownload\sqlite-dll-win32-x86-3080803\sqlite3.def /machine:ix86

回车编译完成。

2.3 编译完成后生成sqlite3.lib、sqlite3.exp文件，该文件路径在：C:\Program Files\Microsoft Visual Studio 9.0\VC

参考 http://blog.sina.com.cn/s/blog_a459dcf501013pwv.html

把sqlite3.h拷贝到代码目录下，sqlite3.lib,sqlite3.dll文件拷贝到生成exe目录下。

#include <windows.h>

#include "..\SQLite\sqlite3.h"

#pragma comment(lib,"sqlite3.lib")

sqlite3 * pDB = NULL;
int SQLiteDB::OpenDB()
{
    CMyFile myfile;
    CMyString mystring;
    string s_db_path = myfile.GetRunDir() + "\\TS15.db";

    char *c_db_path = new char[s_db_path.length() + ];
    strcpy(c_db_path, s_db_path.c_str());

    int ret = sqlite3_open(c_db_path, &pDB);
    if (ret != SQLITE_OK)
    {
        sqlite3_close(pDB);
        return ;
    }

    //delete[]c_db_path;
    //return ret;
    return ret;
}

int SQLiteDB::ExecuteSql(string sql)
{
        char *c_sql = new char[sql.length() + ];
        strcpy_s(c_sql, strlen(c_sql), sql.c_str());
        char* c_err_msg;

        int  ret = sqlite3_exec(pDB, c_sql, , , &c_err_msg);

        if (ret != SQLITE_OK)
        {
            //cout << "select fail: " << cErrMsg << endl;
            sqlite3_close(pDB);
            return ;
        }

        return ;

}

int SQLiteDB::CloseSQLiteDB()
{

    sqlite3_close(pDB);
    return ;
}

// ConvertPrintVarDlg.cpp : implementation file
//

#include "stdafx.h"
#include "ConvertPrintVar.h"
#include "ConvertPrintVarDlg.h"
#include "afxdialogex.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// CAboutDlg dialog used for App About

class CAboutDlg : public CDialogEx
{
public:
    CAboutDlg();

// Dialog Data
    enum { IDD = IDD_ABOUTBOX };

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support

// Implementation
protected:
    DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD)
{
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialogEx)
END_MESSAGE_MAP()

// CConvertPrintVarDlg dialog

CConvertPrintVarDlg::CConvertPrintVarDlg(CWnd* pParent /*=NULL*/)
    : CDialogEx(CConvertPrintVarDlg::IDD, pParent)
{
    m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CConvertPrintVarDlg::DoDataExchange(CDataExchange* pDX)
{
    CDialogEx::DoDataExchange(pDX);
}

BEGIN_MESSAGE_MAP(CConvertPrintVarDlg, CDialogEx)
    ON_WM_SYSCOMMAND()
    ON_WM_PAINT()
    ON_WM_QUERYDRAGICON()
    ON_BN_CLICKED(IDC_BUTTON_OK, &CConvertPrintVarDlg::OnBnClickedButtonOk)
END_MESSAGE_MAP()

// CConvertPrintVarDlg message handlers

BOOL CConvertPrintVarDlg::OnInitDialog()
{
    CDialogEx::OnInitDialog();
    GetDlgItem(IDC_STATIC_MSG)->SetWindowText(_T(""));
    // Add "About..." menu item to system menu.

    // IDM_ABOUTBOX must be in the system command range.
    ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
    ASSERT(IDM_ABOUTBOX < 0xF000);

    CMenu* pSysMenu = GetSystemMenu(FALSE);
    if (pSysMenu != NULL)
    {
        BOOL bNameValid;
        CString strAboutMenu;
        bNameValid = strAboutMenu.LoadString(IDS_ABOUTBOX);
        ASSERT(bNameValid);
        if (!strAboutMenu.IsEmpty())
        {
            pSysMenu->AppendMenu(MF_SEPARATOR);
            pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
        }
    }

    // Set the icon for this dialog.  The framework does this automatically
    //  when the application's main window is not a dialog
    SetIcon(m_hIcon, TRUE);            // Set big icon
    SetIcon(m_hIcon, FALSE);        // Set small icon

    // TODO: Add extra initialization here

    return TRUE;  // return TRUE  unless you set the focus to a control
}

void CConvertPrintVarDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
    if ((nID & 0xFFF0) == IDM_ABOUTBOX)
    {
        CAboutDlg dlgAbout;
        dlgAbout.DoModal();
    }
    else
    {
        CDialogEx::OnSysCommand(nID, lParam);
    }
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CConvertPrintVarDlg::OnPaint()
{
    if (IsIconic())
    {
        CPaintDC dc(this); // device context for painting

        SendMessage(WM_ICONERASEBKGND, reinterpret_cast<WPARAM>(dc.GetSafeHdc()), );

        // Center icon in client rectangle
        int cxIcon = GetSystemMetrics(SM_CXICON);
        int cyIcon = GetSystemMetrics(SM_CYICON);
        CRect rect;
        GetClientRect(&rect);
        int x = (rect.Width() - cxIcon + ) / ;
        int y = (rect.Height() - cyIcon + ) / ;

        // Draw the icon
        dc.DrawIcon(x, y, m_hIcon);
    }
    else
    {
        CDialogEx::OnPaint();
    }
}

// The system calls this function to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CConvertPrintVarDlg::OnQueryDragIcon()
{
    return static_cast<HCURSOR>(m_hIcon);
}

sqlite3 * pDB = NULL;

string save_file_path;

bool WritePrintData();
void ReadPrintData(string file_path);
bool AddPrintData(string var_name, string var1);
bool UpdatePrintData(string var_name, string var2, string var3, string var4);
bool DeletePrintData();
int Sqlite3ExecCallback(void *data, int nColumn,char **colValues, char **colNames);

void CConvertPrintVarDlg::OnBnClickedButtonOk()
{
    // TODO: Add your control notification handler code here
    GetDlgItem(IDC_STATIC_MSG)->SetWindowText(_T(""));
    CString  file_path;
    GetDlgItemTextW(IDC_MFCEDITBROWSE_File, file_path);
    if (file_path == "")
    {
        GetDlgItem(IDC_STATIC_MSG)->SetWindowText(_T("please select file path"));
        return;
    }
    CMyFile myfile;
    CMyString mystring;

    string run_dir=myfile.GetRunDir();
    string db_path = run_dir + "\\db.db";
    char* c_db_path = mystring.StringToPchar(db_path);
    //IDC_MFCEDITBROWSE_File

    int find_index = file_path.ReverseFind('\\');

    CString  file_current_path = file_path.Mid(, find_index);

    CString  cs_save_file_path = file_current_path + "\\printvar.txt";

    DeleteFile(cs_save_file_path);

    int len = WideCharToMultiByte(CP_ACP, , cs_save_file_path, -, NULL, , NULL, NULL);
    char *ptxtTemp = new char[len + ];
    WideCharToMultiByte(CP_ACP, , cs_save_file_path, -, ptxtTemp, len, NULL, NULL);

    save_file_path = ptxtTemp;

    int nRes = sqlite3_open(c_db_path, &pDB);

   if (nRes != SQLITE_OK)
   {
     /*  cout << "Open database fail: " << sqlite3_errmsg(pDB);
       goto QUIT;*/
       GetDlgItem(IDC_STATIC_MSG)->SetWindowText(_T("database fail"));
   }
   else
   {
       DeletePrintData();
       ReadPrintData("E:\\ProgramTest\\ConvertPrintVar\\Debug\\1.cpp");

       WritePrintData();

       GetDlgItem(IDC_STATIC_MSG)->SetWindowText(_T("ok"));
   }

}

string& trim(string &s)
{
    if (s.empty())
    {
        return s;
    }

    s.erase(, s.find_first_not_of(" "));
    s.erase(s.find_last_not_of(" ") + );
    return s;
}

void ReadPrintData(string file_path)
{

    ifstream s;
    string text_line = "";
    string line_temp = "";

    string var_name;
    string var1;
    string var2;
    string var3;
    string var4;
    int find_index10 = ;
    int find_index11 = ;
    int find_index12 = ;
    int find_index13 = ;
    int find_index14 = ;

    int find_index00 = ;
    int find_index20 = ;
    int find_index21= ;
    int find_index22 = ;
    int find_index23 = ;
    int find_index24 = ;
    int find_index25 = ;
    int find_index26 = ;

    string str1;
    string str11;
    string str2;
    string str3;
    s.open(file_path, ios::in);
    if (s)
    {
        while (!s.eof())
        {
            getline(s, text_line);

            if (text_line != "")
            {

            //const  char* PrintData::PRT_DATE = QT_TR_NOOP("Date");
            find_index10 = text_line.find("QT_TR_NOOP");
            find_index00 = text_line.find("//");
            if (find_index10> && find_index00==-)
            {
                find_index11 = text_line.find("::");

                find_index12 = text_line.find("=");

                find_index13 = text_line.find_first_of('(');
                find_index14 = text_line.find_last_of(')');

                var_name = text_line.substr(find_index11+, find_index12 - find_index11-);
                var1 = text_line.substr(find_index13+, find_index14- find_index13-);
                trim(var_name);
                trim(var1);
                AddPrintData(var_name, var1);

            }
            //{PrintData::PRT_NET, "10.00", 7, PrintData::RIGHT},
            find_index20 = text_line.find("{PrintData");

            if (find_index20 >  && find_index00 == -)
            {

                find_index21 = text_line.find_first_of(',');
                var_name = text_line.substr(find_index20 + , find_index21 - find_index20 - );

                str1 = text_line.substr(find_index21+);
                trim(str1);
                find_index22 = str1.find_first_of(',');

                str11 = str1.substr(, find_index22-);

                trim(str11);
                var2 = str11.substr(, str11.length()-);
                //var2 = str1.substr(1, find_index22-2);

                str2 = str1.substr(find_index22+);

                trim(str2);
                find_index23 = str2.find_first_of(',');

                var3 = str2.substr(, find_index23);

                str3 = str2.substr(find_index23+);
                trim(str3);

                find_index24 = str3.find("}");

                var4 = str3.substr(, find_index24 - );
                trim(var_name);
                trim(var2);
                trim(var3);
                trim(var4);
                UpdatePrintData(var_name, var2, var3, var4);

            }
            text_line = "";

          } //end if(text_line != "")

        }
    }
    s.close();

}

bool WritePrintData()
{
    string sql = "select Variable1,Variable2,Variable3,Variable4 from PrintData";
    char *c_sql = new char[sql.length() + ];
    // strcpy(c_sql, sql.c_str());
    strcpy_s(c_sql, strlen(c_sql), sql.c_str());
    char* c_err_msg;
    int  ret = sqlite3_exec(pDB, c_sql,&Sqlite3ExecCallback, , &c_err_msg);
    if (ret != SQLITE_OK)
    {

        //cout << "select fail: " << cErrMsg << endl;
        return false;
    }
  return true;

}
int Sqlite3ExecCallback(void *data, int nColumn, char **colValues, char **colNames)
{
    //for (int i = 0; i < nColumn; i++)
    //{

    //    //printf("%s\t", colValues[i]);
    //}
    //printf("\n");
    string var1 = colValues[];
    string var2 = colValues[];
    string var3 = colValues[];
    string var4 = colValues[];
    string str = var1 + ":" + var3 + ":" + var1 + ":" + var1 + ":" + var2;

    //添加模式
    ofstream  s(save_file_path, ios::app);
    if (!s)
    {
        s.close();
    }
    s << str<< endl;
    s.close();

    return ;
}

bool AddPrintData(string var_name, string var1)
{

    string sql = "insert into PrintData(VarName,Variable1,Variable2,Variable3,Variable4)values('";
    sql += var_name + "','" + var1 + "'," + "'',"+"''," + "'')";

    char *c_sql = new char[sql.length() + ];
    // strcpy(c_sql, sql.c_str());
    strcpy_s(c_sql, strlen(c_sql), sql.c_str());
    char* c_err_msg;
    int  ret = sqlite3_exec(pDB, c_sql, , , &c_err_msg);

    //delete[] c_sql;
    //c_sql = nullptr;

    if (ret != SQLITE_OK)
    {
        //cout << "select fail: " << cErrMsg << endl;
        return false;
    }
    return true;
}
bool UpdatePrintData(string var_name, string var2, string var3, string var4)
{

string    sql = "update PrintData set Variable2='";
    sql += var2 + "', Variable3='";
    sql += var3 + "', Variable4='";
    sql += var4 +"' where VarName='";
    sql += var_name +"'";

    char *c_sql = new char[sql.length() + ];
    //strcpy(c_sql, sql.c_str());
    strcpy_s(c_sql, strlen(c_sql), sql.c_str());

    char* c_err_msg;
    int  ret = sqlite3_exec(pDB, c_sql, , , &c_err_msg);
    //delete[] c_sql;
    //c_sql = nullptr;
    if (ret != SQLITE_OK)
    {
        //cout << "select fail: " << cErrMsg << endl;
        return false;
    }
    return true;
}
bool DeletePrintData()
{

    string sql = "delete from PrintData ";
    char* c_err_msg;
    char *c_sql = new char[sql.length() + ];
    //strcpy(c_sql, sql.c_str());
    strcpy_s(c_sql, strlen(c_sql), sql.c_str());

    int  ret = sqlite3_exec(pDB, c_sql, , , &c_err_msg);

    if (ret != SQLITE_OK)
    {
        //cout << "select fail: " << cErrMsg << endl;
        return false;
    }

    return true;

}