1、要支持数据库编程，首先在工程文件中增加：

QT +=  sql   头文件：#include 
     

2、下面新建一个数据库test,然后新建一个表test_table，在表中新建两个字段：id,name。然后查询表，并显示。

QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");       //db.setHostName("fedora12");        db.setDatabaseName("test");       //db.setUserName("jdh");        //db.setPassword("123456");        if (!db.open())       {           cout << "shu ju ku dabukai!!!!!!!" << endl;       }           cout << "shu ju ku cao zuo---------------!!!!!!!" << endl;       QSqlQuery q;       if (q.exec("CREATE TABLE test_table (id INT PRIMARY KEY,name VARCHAR)") == false)       {           cout << "shu ju ku dabukai22222222!!!!!!!" << endl;       }       q.exec("insert into test_table values (8,'LiLei')");       q.exec("insert into test_table values (46,'HanMeiMei')");       q.exec("select * from test_table");       while (q.next())       {           cout << "caozuo!!" << endl;           int id = q.value(0).toInt();           QString name = q.value(1).toString();           qDebug() << id << name << endl;       }     QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");      //db.setHostName("fedora12");      db.setDatabaseName("test");      //db.setUserName("jdh");      //db.setPassword("123456");      if (!db.open())      {          cout << "shu ju ku dabukai!!!!!!!" << endl;      }       cout << "shu ju ku cao zuo---------------!!!!!!!" << endl;      QSqlQuery q;      if (q.exec("CREATE TABLE test_table (id INT PRIMARY KEY,name VARCHAR)") == false)      {          cout << "shu ju ku dabukai22222222!!!!!!!" << endl;      }      q.exec("insert into test_table values (8,'LiLei')");      q.exec("insert into test_table values (46,'HanMeiMei')");      q.exec("select * from test_table");      while (q.next())      {          cout << "caozuo!!" << endl;          int id = q.value(0).toInt();          QString name = q.value(1).toString();          qDebug() << id << name << endl;      }

　　如果数据库名称为:memory:,则只在内存中建立表.