#include 
     
      #include 
      
       #include 
       
        #include 
        
         int main(int argc, char *argv[]){    QCoreApplication a(argc, argv);    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");    db.setDatabaseName("student.db");    if(!db.open())    {        qDebug() << "open err";    }    else    {        qDebug() << "database is ok";    }    QSqlQuery query(db);    bool isok = query.exec("create table stud(id int primary key,name varchar(20))");    query.exec("insert into stud values(111,'liming')");    query.exec("insert into stud values(102,'li')");    query.exec("insert into stud values(103,'lisi')");    query.exec("insert into stud values(105,'zhangsan')");    if(!isok)    {        qDebug() << "table err";    }    else    {        qDebug() << "table is ok";    }    query.exec("select * from stud");    while(query.next())    {        qDebug() << "id:"<
         
          <<"name:"<
         
        
       
      
     

 

if(QSqlDatabase::contains("myconn"))    {        db = QSqlDatabase::database("myconn");    }else    {        db = QSqlDatabase::addDatabase("QSQLITE","myconn");    }    db.setDatabaseName("sqlite.db");    bool ok = db.open();    if(ok)    {        return true;    }else    {        return false;    }