QtreeWidget的部分基本使用

创建树节点 (QTreeWidgetItem) 并添加到 QTreeWidget中：

// 创建子节点
QTreeWidgetItem *child1 = new QTreeWidgetItem(root);
child1->setText(0, "子节点1");
child1->setText(1, "子节点1的列2内容");

QTreeWidgetItem *child2 = new QTreeWidgetItem(root);
child2->setText(0, "子节点2");
child2->setText(1, "子节点2的列2内容");

// 添加节点到树
treeWidget.addTopLevelItem(root);

排序:

ui->treeWidget->setSortingEnabled(true);
ui->treeWidget->header()->setSortIndicatorShown(true);
ui->treeWidget->header()->setSortIndicator(0, Qt::AscendingOrder);

QtreeWidget加载数据库：

#include <QApplication>
#include <QMainWindow>
#include <QTreeWidget>
#include <QTreeWidgetItem>
#include <QtSql>

int main(int argc, char *argv[]) {
QApplication app(argc, argv);
// 创建主窗口和 QTreeWidget
QMainWindow mainWindow;
QTreeWidget treeWidget(&mainWindow);
treeWidget.setHeaderLabels({"列1", "列2"});

// 创建数据库连接
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("mydatabase.db"); // 替换为您的数据库文件名

// 打开数据库
if (!db.open()) {
    qDebug() << "Database connection failed.";
    return 1;
}

// 创建查询
QSqlQuery query;
query.exec("SELECT column1, column2 FROM mytable"); // 替换为您的表名和列名

// 遍历查询结果并添加到 QTreeWidget
while (query.next()) {
    QString column1Value = query.value(0).toString();
    QString column2Value = query.value(1).toString();

    QTreeWidgetItem *item = new QTreeWidgetItem(&treeWidget);
    item->setText(0, column1Value);
    item->setText(1, column2Value);
}

treeWidget.show();

return app.exec();

}