一、界面与数据库连接，使用QSqlTableModel对数据处理

//界面初始化
void TestProSetWid::initsqlmodel()
{// 连接SQLite数据库db = QSqlDatabase::addDatabase("QSQLITE","second");db.setDatabaseName("./testitem.db"); // 替换为你的数据库文件路径if (!db.open()) {qDebug() << "Failed to connect to database";return;}elseqDebug()<<"连接数据库成功"<<endl;// 创建数据模型   /* QSqlQueryModel 适合用于查询数据，不能修改数据 */dbmodel = new QSqlTableModel(this, db);dbmodel->setTable("order_settings"); // 替换为你的表名   第一页订单号/* 如果有修改则同步修改到数据库，* 注意这个规则需要与 tabview 这样的控件才生效，* 因为 tabview 可以直接编辑表里的内容 */dbmodel->setEditStrategy(QSqlTableModel::OnFieldChange);dbmodel->select();//    if(!dbmodel->select())//        qDebug()<<"err"<<endl;mProxyModel = new QRowsLimitProxyModel;mProxyModel->setSourceModel(dbmodel);  //排序 筛选功能mProxyModel->setDynamicSortFilter(true);/* 设置表格的头信息，若不设置则显示数据库里的英文字段头信息 */dbmodel->setHeaderData(dbmodel->fieldIndex("order_num"),Qt::Horizontal, tr("订单"));dbmodel->setHeaderData(dbmodel->fieldIndex("tested_product_type"),Qt::Horizontal, tr("类型"));dbmodel->setHeaderData(dbmodel->fieldIndex("inspect_unit"),Qt::Horizontal, tr("单位"));dbmodel->setHeaderData(dbmodel->fieldIndex("test_number"),Qt::Horizontal, tr("编号"));// 将查询结果绑定到TableView上ui->tableView->setModel(mProxyModel);// 设置内容居中显示CenterAlignedDelegate *delegate = new CenterAlignedDelegate(this);ui->tableView->setItemDelegate(delegate);ui->tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);// 设置第一列的Stretch，将第一列的列宽设置为100像素ui->tableView->horizontalHeader()->setSectionResizeMode(0, QHeaderView::Fixed);ui->tableView->setColumnWidth(0, 100);//    ui->tableView->verticalHeader()->setSectionResizeMode(0, QHeaderView::Fixed);// 设置行高ui->tableView->verticalHeader()->setDefaultSectionSize(70);  // 这里设置行高为50像素ui->tableView->horizontalHeader()->setStyleSheet("font-size:16pt;");//    ui->tableView->setStyleSheet(setcolor);ui->tableView->horizontalHeader()->setStyleSheet(setcolor);ui->tableView->horizontalHeader()->setMinimumHeight(50);ui->tableView->setSelectionMode(QAbstractItemView::ContiguousSelection);//多选ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);//选中行ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);//不可编辑//    Commonstyle("tableView");//计算当前数据库一共有多少页updateTotalCount(mProxyModel->rowCount());on_pagehome();connect(ui->tableView->selectionModel(),SIGNAL(selectionChanged(const QItemSelection &, const QItemSelection &)),this,SLOT(slotSelectChanged(const QItemSelection &, const QItemSelection &)));}

二、创建弹窗控件，可以添加内容

//新建订单弹窗
void TestProSetWid::createdialog()
{newOrderDialog = new QDialog(this);newOrderDialog->setMinimumSize(500, 400);newOrderDialog->setMaximumSize(500, 400);newOrderDialog->setModal(true);QGridLayout *orderLayout = new QGridLayout();QHBoxLayout *btnLayout = new QHBoxLayout();QVBoxLayout *mainLayout = new QVBoxLayout();orderNumLabel    = new QLabel("单号：");typeLabel             = new QLabel("类型：");organizationLabel = new QLabel("单位：");testNumLabel      = new QLabel("编号：");orderNumEdit = new QLineEdit();typeEdit          = new QLineEdit();organizationEdit = new QLineEdit();testNumEdit      = new QLineEdit();orderNumEdit->setReadOnly(true); //只读orderNumLabel->setStyleSheet("color:white;");typeLabel->setStyleSheet("color:white;");organizationLabel->setStyleSheet("color:white;");testNumLabel->setStyleSheet("color:white;");orderNumEdit->setStyleSheet("background-color:white;" );typeEdit->setStyleSheet("background-color:white;");organizationEdit->setStyleSheet("background-color:white;");testNumEdit->setStyleSheet("background-color:white;");QFont font;font.setFamily("宋体");font.setPointSize(12);font.setBold(true);orderNumLabel->setFont(font);typeLabel->setFont(font);organizationLabel->setFont(font);testNumLabel->setFont(font);orderNumEdit->setFont(font);typeEdit->setFont(font);organizationEdit->setFont(font);testNumEdit->setFont(font);QPushButton *addBtn = new QPushButton("确认");QPushButton *cancelBtn = new QPushButton("取消");addBtn->setFixedSize(80,40);cancelBtn->setFixedSize(80,40);addBtn->setFont(font);cancelBtn->setFont(font);addBtn->setStyleSheet("background-color:rgb(48,176,226);border-radius:10px;");cancelBtn->setStyleSheet("background-color:rgb(48,176,226);border-radius:10px;");orderLayout->addWidget(orderNumLabel,0,0);orderLayout->addWidget(orderNumEdit,0,1);orderLayout->addWidget(typeLabel,1,0);orderLayout->addWidget(typeEdit,1,1);orderLayout->addWidget(organizationLabel,2,0);orderLayout->addWidget(organizationEdit,2,1);orderLayout->addWidget(testNumLabel,3,0);orderLayout->addWidget(testNumEdit,3,1);orderLayout->setVerticalSpacing(50);btnLayout->addWidget(addBtn);btnLayout->addWidget(cancelBtn);mainLayout->addLayout(orderLayout);mainLayout->addLayout(btnLayout);mainLayout->setStretch(0,1);mainLayout->setStretch(1,1);newOrderDialog->setLayout(mainLayout);connect(addBtn,SIGNAL(clicked()),this,SLOT(addbtn_clicked()));connect(cancelBtn, &QPushButton::clicked, this, [=](){// 关闭数据库的代码productDialog->close();});}

与确认按钮链接槽函数

//弹窗新建订单确认按钮
void TestProSetWid::addbtn_clicked()
{int row = dbmodel->rowCount();/* 写入数据到数据库 */dbmodel->insertRow(row);dbmodel->setData(dbmodel->index(row, 0), orderNumEdit->text());dbmodel->setData(dbmodel->index(row, 1), typeEdit->text());dbmodel->setData(dbmodel->index(row, 2), organizationEdit->text());dbmodel->setData(dbmodel->index(row, 3), testNumEdit->text());dbmodel->submit();/* 再确保提交 */if (dbmodel->isDirty())dbmodel->submitAll();newOrderDialog->close();updateTotalCount(dbmodel->rowCount());//当前页数函数//    ui->lineEdit_5->setText(QString("%1").arg(mTotalPage));on_pageend();//返回尾页函数
}