Qt-处理Sqlite数据库
示例
在Project.pro文件中，我们添加：CONFIG+=sql
在MainWindow.h我们写道：
#include <QMainWindow>
#include <QSql>
#include <QDebug>
namespace Ui
{
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
private:
Ui::MainWindow *ui;
QSqlDatabase db;
};现在在MainWindow.cpp：
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
db = QSqlDatabase::addDatabase("QSQLITE" , "CONNECTION NAME");
db.setDatabaseName("C:\\sqlite_db_file.sqlite");
if(!db.open())
{
qDebug() << "Can't Connect to DB !";
}
else
{
qDebug() << "已成功连接到数据库！";
QSqlQuery query;
query.prepare("SELECT name , phone , address FROM employees WHERE ID = 201");
if(!query.exec())
{
qDebug() << "Can't Execute Query !";
}
else
{
qDebug() << "查询执行成功！";
while(query.next())
{
qDebug() << "员工姓名： " << query.value(0).toString();
qDebug() << "员工电话： " << query.value(1).toString();
qDebug() << "员工地址： " << query.value(1).toString();
}
}
}
}
MainWindow::~MainWindow()
{
delete ui;
}