QT: Create DB and tables using api functions of sqlite database

1. Put sqlite.h and sqlite.lib into your project
2. Add LIBS +=E:\qtCore\day07\Button\sqlite3.lib to .pro

bool Button::CreateSqliteDB_Type(QString DBName, QString TableName, vector<QString>& field_str)
{
    
    
    QString str="";
    int rc(1);
    char * err_msg = nullptr;
    const char* tempDBName=DBName.toStdString().c_str();
    rc = sqlite3_open(tempDBName, &m_pDB);// 打开数据库，不存在时创建
    if (rc)
    {
    
    
        sqlite3_close(m_pDB);  //打开失败！
        QMessageBox::warning(nullptr,"warning","Create DB 数据库打开失败，请检查后再操作！",QMessageBox::Yes|QMessageBox::No);

        return false;
    }
     const char* sqlcode;
    char **resultp = nullptr;
    int nrow(0), ncolumn(0);
    string sqlStr="select name from sqlite_master where name = '"+TableName.toStdString()+"'";
    sqlcode=sqlStr.c_str();
    rc = sqlite3_get_table(m_pDB, sqlcode, &resultp, &nrow, &ncolumn, &err_msg);
    OutputDebugStringA(sqlcode);
    if (rc == 0 && nrow > 0)
    {
    
    
        str= "已经存在" + TableName;
        OutputDebugStringA(str.toStdString().c_str());
        if (resultp != nullptr) {
    
    
            sqlite3_free_table(resultp);
            resultp = nullptr;
        }
        if (err_msg != nullptr) {
    
    
            sqlite3_free(err_msg);
            err_msg = nullptr;
        }
        sqlite3_close(m_pDB);
        return true;
    }
    if (resultp != nullptr) {
    
    
        sqlite3_free_table(resultp);
        resultp = nullptr;
    }
    if (err_msg != nullptr) {
    
    
        sqlite3_free(err_msg);
        err_msg = nullptr;
    }



    strcpy(SQL_CREATE_TABLE, "Create table if not exists ");
    strcat(SQL_CREATE_TABLE, "Particle");
    strcat(SQL_CREATE_TABLE, "(");
    size_t vecSize = field_str.size();
    for (size_t ii = 0; ii < vecSize; ii++)
    {
    
    
        if (ii == vecSize - 1)
        {
    
    
            strcat(SQL_CREATE_TABLE, field_str[ii].toStdString().c_str());
            strcat(SQL_CREATE_TABLE, ")");
        }
        else
        {
    
    
            strcat(SQL_CREATE_TABLE, field_str[ii].toStdString().c_str());
            strcat(SQL_CREATE_TABLE, ",");
        }
    };
#ifdef _cout
    cout << "SQL = " << SQL_CREATE_TABLE << endl;
#endif
    string cs_temp;
    cs_temp = SQL_CREATE_TABLE;
    const char * s =SQL_CREATE_TABLE;
    OutputDebugStringA(cs_temp.c_str());
    int res;
    res = sqlite3_exec(m_pDB, s, nullptr, nullptr, &err_msg);
    if (res != SQLITE_OK)
    {
    
    
         QMessageBox::warning(nullptr,"warning","操作失败，数据库链表生成错误！",QMessageBox::Yes|QMessageBox::No);
        str=QString("创建表'%1'操作失败，数据库链表生成错误！res=%1").arg(TableName).arg(res);
        OutputDebugStringA(str.toStdString().c_str());
        return false;
    }
    sqlite3_close(m_pDB);
    return true;
}