C++DAY50

源文件代码

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::Widget)
{
    ui->setupUi(this);

    if(!db.contains())
    {
        db = QSqlDatabase::addDatabase("QSQLITE");

        db.setDatabaseName("stuinfo.db");
        QMessageBox::information(this,"","创建数据库成功");
    }

    if(!db.open())
    {
        QMessageBox::information(this,"","打开数据库失败");
        return;
    }

    QSqlQuery query;

    QString sql = "create table if not exists stu_info_table("
                  "id integer primary key autoincrement,"
                  "numb integer,"
                  "name varchar(20),"
                  "sex varchar(4),"
                  "score integer)";

    if(query.exec(sql))
    {
        QMessageBox::information(this,"","创建数据表成功");
    }
    else
    {
        QMessageBox::information(this,"","创建数据表失败");
    }

}

Widget::~Widget()
{
    delete ui;
}


void Widget::on_addbtn_clicked()
{
    int numb = ui->numEdit->text().toUInt();
    QString name = ui->nameedit->text();
    QString sex = ui->sexedit->text();
    int score = ui->scoreedit->text().toUInt();

    if(numb == 0 || name.isEmpty() || sex.isEmpty() || score == 0)
    {
        QMessageBox::information(this,"","请输入完整信息");
        return;
    }

    QSqlQuery query;
    QString sql = QString("insert into stu_info_table(numb,name,sex,score) "
                          "values(%1,'%2','%3',%4)")
                            .arg(numb).arg(name).arg(sex).arg(score);
    if(query.exec(sql))
    {
        QMessageBox::information(this,"","添加成功");
    }
    else
    {
        QMessageBox::information(this,"","添加失败");
    }
}

void Widget::on_showbtn_clicked()
{
    QSqlQuery query;
    QString sql = "select * from stu_info_table";
    ui->tableWidget->clear();
    if(query.exec(sql))
    {
        int i = 0;
        while(query.next())
        {
            for(int j = 0;j < query.record().count();j++)
            {
                ui->tableWidget->setItem(i,j,new QTableWidgetItem(query.value(j+1).toString()));

            }
                i++;
        }
    }
}

void Widget::on_deletebtn_clicked()
{
    QString name = ui->nameedit->text();

    QSqlQuery query;
    QString sql = QString("delete from stu_info_table where name='%1'").arg(name);


    if(query.exec(sql))
    {
        QMessageBox::information(this,"","删除成功");
    }
    else
    {
        QMessageBox::information(this,"","删除失败");
    }
}

void Widget::on_searchbtn_clicked()
{

    QString name = ui->nameedit->text();
    ui->tableWidget->clear();

    QSqlQuery query;
    QString sql = QString("select * from stu_info_table where name = '%1' ").arg(name);

    if(query.exec(sql))
    {
        QMessageBox::information(this, "", "查找成功");
        int i = 0;
        while(query.next())
        {
            for (int j = 0; j < query.record().count(); j++)
            {
                ui->tableWidget->setItem(i, j, new QTableWidgetItem(query.value(j+1).toString()));
            }
            i++;
        }
    }
    else
        QMessageBox::information(this, "", "查找失败");

}