代码补充：要求用户在UserWidget界面点击QComboBox可以选择睡眠模式日常模式节能模式用户选择模式后SQlite的Status表内数据改变#include userswidgeth#include ui_userswidgeth#include sqliteh#include lightsh#include airconditionh#include curtainsh#include

这段代码存在一些问题，需要进行修改和补充。以下是修改后的代码：

userswidget.h:

#ifndef USERSWIDGET_H
#define USERSWIDGET_H

#include <QWidget>

namespace Ui {
class UsersWidget;
}

class UsersWidget : public QWidget
{
    Q_OBJECT

public:
    explicit UsersWidget(int userid, QWidget *parent = nullptr);
    ~UsersWidget();

private slots:
    void on_modeComboBox_currentIndexChanged(const QString &mode);

private:
    Ui::UsersWidget *ui;
    int userid;

    void displayUsersWidget();
    void closeEvent(QCloseEvent *e);
    void updateSmartHomeStatus(int userId, QString deviceName, QString devicestate, QString newValue);
    bool statusUid(int userId);
};

#endif // USERSWIDGET_H

userswidget.cpp:

#include "userswidget.h"
#include "ui_userswidget.h"
#include "sqlite.h"
#include "lights.h"
#include "aircondition.h"
#include "curtains.h"
#include "humidiffer.h"
#include "information.h"
#include "procession.h"
#include <QCloseEvent>
#include <QMessageBox>

UsersWidget::UsersWidget(int userid, QWidget *parent) :
    QWidget(parent),
    ui(new Ui::UsersWidget),
    userid(userid)
{
    ui->setupUi(this);
    displayUsersWidget();
    connect(ui->lights, &QToolButton::clicked, this, [=]{
        Lights *w = new Lights(userid);
        w->show();
    });
    connect(ui->air_condition, &QToolButton::clicked, this, [=]{
        AirCondition *w = new AirCondition(userid);
        w->show();
    });
    connect(ui->curtains, &QToolButton::clicked, this, [=]{
        Curtains *w = new Curtains(userid);
        w->show();
    });
    connect(ui->humidifiers, &QToolButton::clicked, this, [=]{
        Humidiffer *w = new Humidiffer(userid);
        w->show();
    });
    connect(ui->tables, &QToolButton::clicked, this, [=]{
        Information *w = new Information;
        w->show();
    });
    connect(ui->wifi, &QToolButton::clicked, this, [=]{
        Procession *w = new Procession;
        w->show();
    });
    connect(ui->mode, SIGNAL(currentIndexChanged(const QString&)), this, SLOT(on_modeComboBox_currentIndexChanged(const QString&)));
}

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

void UsersWidget::displayUsersWidget()
{
    setWindowTitle("智能家居总览图");
    setFixedSize(900, 600);
}

void UsersWidget::on_modeComboBox_currentIndexChanged(const QString &mode)
{
    if (mode == "睡眠模式") {
        updateSmartHomeStatus(userid, "智能灯", "开启", "20");
        updateSmartHomeStatus(userid, "空调", "开启", "27");
        updateSmartHomeStatus(userid, "加湿器", "开启", "50");
        updateSmartHomeStatus(userid, "窗帘", "开启", "100");
    } else if (mode == "日常模式") {
        updateSmartHomeStatus(userid, "智能灯", "开启", "80");
        updateSmartHomeStatus(userid, "空调", "开启", "25");
        updateSmartHomeStatus(userid, "加湿器", "开启", "60");
        updateSmartHomeStatus(userid, "窗帘", "开启", "50");
    } else if (mode == "节能模式") {
        updateSmartHomeStatus(userid, "智能灯", "开启", "50");
        updateSmartHomeStatus(userid, "空调", "开启", "26");
        updateSmartHomeStatus(userid, "加湿器", "开启", "40");
        updateSmartHomeStatus(userid, "窗帘", "开启", "30");
    }
}

void UsersWidget::closeEvent(QCloseEvent *e)
{
    if (e->spontaneous()) {
        //窗口关闭时弹出的提示窗口
        QMessageBox::StandardButton reply;
        reply = QMessageBox::information(this, "提示", "确认退出智能管家系统？", QMessageBox::Yes | QMessageBox::No);
        if (reply == QMessageBox::Yes) {
            //若用户点击确认，则接收这个事件,当前窗口会关闭
            e->accept();
        } else {
            //若用户点击取消，则忽略这个事件，当前窗口不会关闭
            e->ignore();
        }
    }
}

sqlite.cpp:

#include "sqlite.h"
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QDebug>
#include <QSqlError>

Sqlite::Sqlite()
{

}

void Sqlite::sqlite_init()
{
    // 先关闭重复的数据库连接
    if (QSqlDatabase::contains("qt_sql_default_connection")) {
        QSqlDatabase::removeDatabase("qt_sql_default_connection");
    }
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("../Smarthome_Client/database/database.db");
    if (!db.open()) {
        qDebug() << "无法打开数据库！";
    } else {
        qDebug() << "数据库打开成功！";
    }
}

void Sqlite::updateSmartHomeStatus(int userId, QString deviceName, QString devicestate, QString newValue)
{
    sqlite_init();
    // 执行更新操作
    QSqlQuery query;
    query.prepare("SELECT * FROM Status WHERE uid = :userId");
    query.bindValue(":userId", userId);
    if (!query.exec()) {
        qDebug() << "查询id失败：" << query.lastError().text();
    }
    QString sql = QString("INSERT INTO Status (uid, device_name, device_state, value) VALUES (%1, '%2', '%3', '%4')")
            .arg(userId).arg(deviceName).arg(devicestate).arg(newValue);
    query.prepare(sql);
    if (!query.exec()) {
        qDebug() << "插入数据失败：" << query.lastError().text();
        return;
    }
}

bool Sqlite::statusUid(int userId)
{
    sqlite_init();
    QSqlQuery query;
    // 查询智能家居状态表，获取用户对应的状态
    query.prepare("SELECT * FROM status WHERE user_id = :userId");
    query.bindValue(":userId", userId);
    qDebug() << query.exec();
    if (!query.next()) {
        qDebug() << "Failed to execute query!" << query.lastError().text();
        return false;
    } else {
        qDebug() << "Successed to execute query!";
        return true;
    }
}

注意事项：

1. Sqlite类的成员函数需要在定义时加上类名作为前缀，以指明其所属类。
2. Sqlite类的成员函数需要在实现文件中进行定义。
3. Sqlite类的成员函数的定义需要加上Sqlite::作为前缀，以指明其所属类。
4. 在updateSmartHomeStatus函数中，需要使用Sqlite::sqlite_init()进行数据库初始化，而不是直接调用sqlite_init()。
5. 在statusUid函数中，需要使用Sqlite::sqlite_init()进行数据库初始化，而不是直接调用sqlite_init()。

此外，还需要在主程序中包含userswidget.h和sqlite.h头文件，并创建UsersWidget对象进行使用