QSqlDatabase操作数据库sqlite3

http://blog.csdn.net/liukang325/article/details/22735339

基本打开数据库，执行SQL语句：

 static const char* DBName = "./test.db";
 QFileInfo file(DBName);
 if(file.exists() == false)
 {
     QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
     db.setDatabaseName(DBName); //设置数据库名

     if (!db.open())
     {
         qDebug("数据库不能打开");
         return -1;
     }

     QSqlQuery query;
     ///创建卡号数据库
     query.exec("CREATE TABLE tb_card(cardNum varchar(64) PRIMARY KEY, name varchar(64), job varchar(64))");
     query.clear();
  }

select查询获取数据：

 QSqlQuery query(dbConn);
 QString sqlStr;
 sqlStr.append("select * from tb_card");
 bool isSuccess = query.exec(sqlStr);

 QString cardNum, name, job;
 int i = 0;
 while(query.next()) //query.next()指向查找到的第一条记录，然后每次后移一条记录
 {
     cardNum.clear();
     name.clear();
     job.clear();
     cardNum.append(query.value(0).toString());
     name.append(query.value(1).toString());
     job.append(query.value(2).toString());
 }

记得在pro文件中加入：

QT       += core gui sql