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++;}}elseQMessageBox::information(this, "", "查找失败");}