基于Qt5.5.0的sql,C++备忘录软件的编写

2022-02-15 00:35:58

我的第一个软件。

基于Qt5.5.0的 sql ,C++备忘录软件version1.0的编写

我用的Qt版本是5.5.0免配置编译器的版本，这里附上我使用的软件下载地址：http://download.qt.io/official_releases/qt/5.5/5.5.0/ 下载 qt-opensource-windows-x86-mingw492-5.5.0.exe即可。

话不多说，第一先是基于Qt5.5.0的sql的配置，这里详见我的另外一篇博客：http://www.cnblogs.com/xiaobo-Linux/p/4674986.html

此时，sql环境配置好，编写代码。

附上我的代码：

++++++++++++++++++project.pro里面的代码++++++++++++++++

#-------------------------------------------------
#
# Project created by QtCreator 2015-07-21T13:12:40
#
#-------------------------------------------------

QT       += core gui
QT += sql           # 引用数据库
greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = project3
TEMPLATE = app


SOURCES += main.cpp\
        reminder.cpp

HEADERS  += reminder.h

FORMS    += reminder.ui
 #DESTDIR += C://   # 编译文件输出路径,不加此句默认在工程文件下创建.db
RC_FILE=icon.rc  #添加软件图标

+++++++++++++++++++reminder.h的头文件代码+++++++++++++++++++++++

#ifndef REMINDER_H
#define REMINDER_H



#include <QMainWindow>
#include <QSqlDatabase> //数据库类
#include <QSqlQuery>    //执行语句类
//#include <QSqlRecord>   //返回记录类
#include <QtSql>
#include <QApplication>
#include <QMessageBox>
#include <iostream>
//#include <QtDebug>



namespace Ui {
class Reminder;

}

class Reminder : public QMainWindow
{
    Q_OBJECT



public:
    explicit Reminder(QWidget *parent = 0);
    ~Reminder();


private slots:




   void on_save_clicked();


   void on_del_clicked();

   void select();


   void on_search_clicked();

   void on_back_clicked();

private:
    Ui::Reminder *ui;
    QSqlDatabase db;            //声明数据库类

};


#endif // REMINDER_H

++++++++++++++++++++++++main.cpp代码+++++++++++++++++++++++++++++

#include "reminder.h"
#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    //创建DB文件，创建表格
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    std::cout<<"begin sqlite"<<std::endl;
    db.setDatabaseName("reminder.db");
    if ( !db.open()){
    QMessageBox::critical(NULL, QObject::tr("Collection"), QObject::tr("failed to connect to database!"));
    return 0;
    }
    QSqlQuery query;
    query.exec("create table reminder (id integer PRIMARY KEY AUTOINCREMENT,主题 text,内容 text)");


    Reminder w;
    w.show();

    return a.exec();
}

+++++++++++++++++reminder.cpp代码+++++++++++++++++

#include "reminder.h"
#include "ui_reminder.h"

 Reminder::Reminder(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::Reminder)
{
    ui->setupUi(this);
    setWindowTitle("小波的提醒备忘录V1.0");
    setWindowIcon(QIcon("xiaobo.ico"));//设置软件图标
    select();//显示表格

}

Reminder::~Reminder()
{
    db.close();
    delete ui;
}


void Reminder::on_save_clicked()
{
  QSqlQuery query;
  query.prepare("insert into reminder (id,主题,内容)values(1:theme , :content )"); //id自动增加，先从1起，之后无需手动插入

  query.prepare("insert into reminder (主题,内容)values(:theme , :content )");



  query.bindValue(":theme",ui->textEdit->text());            //从输入框插入数据
  query.bindValue(":content",ui->textEdit_2->toPlainText());
  query.exec();

   select();//显示表格


}

void Reminder::on_del_clicked()
{
    QSqlQuery query;

    int curRow = ui->tableView->currentIndex().row();     //鼠标选择删除第几行

    QModelIndex index = ui->tableView->currentIndex();

    int id=index.sibling(curRow,0).data().toInt();

    query.prepare("delete from reminder where id = :id");

    query.bindValue(":id",id);

    query.exec();
    select();

 }

void Reminder::select()
{  //将sql表格显示到tableView里
 QSqlQueryModel *model = new QSqlQueryModel(ui->tableView);
 model->setQuery(QString("select *from reminder"));
 model->setHeaderData(0,Qt::Horizontal,QObject::tr("ID"));
 model->setHeaderData(1,Qt::Horizontal,QObject::tr("主题"));
 model->setHeaderData(2,Qt::Horizontal,QObject::tr("内容"));
 ui->tableView->setModel(model);
}

 void Reminder::on_search_clicked()
 {    QSqlQuery query;
     ui -> tableView -> clearSpans(); //tableview清空
     QSqlQueryModel *model = new QSqlQueryModel(ui->tableView);

      query.prepare("select  *from reminder where 主题 = :theme ");  //like模糊查询没成功
      query.bindValue(":theme",ui->textEdit_3->text());

      query.exec();


      model->setQuery(query);



       model->setHeaderData(0,Qt::Horizontal,QObject::tr("ID"));
       model->setHeaderData(1,Qt::Horizontal,QObject::tr("主题"));
       model->setHeaderData(2,Qt::Horizontal,QObject::tr("内容"));

        ui->tableView->setModel(model);
 }

  void Reminder::on_back_clicked()

    {
       select();

    }