qt数据库 - 技术栈

qt数据库

weixin_466576362023-11-14 19:45

qt中数据库的使用

头文件

cpp 复制代码

#include <QSqlDatabase>
#include <QSqlQuery>

库对象定义，连接库，输出库中表名

cpp 复制代码

  QSqlDatabase db;
 db = QSqlDatabase::addDatabase("QSQLITE");
 // db.setDatabaseName("D:/qtprogrem/kongjian/power.db");//绝对路径
 db.setDatabaseName("../kongjian/power.db");//相对路径
  db.open();
  //输出库中的表名
  QStringList tableList = db.tables();
  foreach (QString tableName, tableList) {
      qDebug() << "Table name:" << tableName;
  }

表的增删改查

//增

cpp 复制代码

//增
  QString name="测试";
 QString SelectString= QString("insert into t_warhead_fusee_type(id,name,introduce) values(%1,'%2','介绍')").arg(5).arg(name.replace("'","''"));
   QSqlQuery query(SelectString,db);
    qDebug()<<SelectString;
//删
    SelectString = QString("delete from t_warhead_fusee_type where id=5");
     query.exec(SelectString);
//改
     SelectString = QString("update t_warhead_fusee_type set name='改' where id=5");
      query.exec(SelectString);
//查
  SelectString = QString("select * from t_warhead_fusee_type");
   query.exec(SelectString);
  while (query.next()) {
      QString name=query.value("name").toString();
      QString id =query.value("id").toString();
      QString introduce=query.value("introduce").toString();
      qDebug()<<id<<name<<introduce;
      comboBox->addItem(name);
  }*