使用qt从sqlite数据库获取数据

#include <QCoreApplication>
#include <QSqlDatabase>
#include <QSqlQuery>
#include <QSqlError>
#include <QDebug>

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

    // 初始化数据库连接
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("example.db");

    if (!db.open()) {
        qDebug() << "Error: connection with database failed";
        return -1;
    }

    // 创建表（如果表不存在）
    QSqlQuery query;
    query.exec("CREATE TABLE IF NOT EXISTS person (id INT PRIMARY KEY, name VARCHAR(20))");

    // 插入示例数据
    query.prepare("INSERT INTO person VALUES (:id, :name)");
    query.bindValue(":id", 1);
    query.bindValue(":name", "Alice");
    query.exec();

    // 查询数据
    query.exec("SELECT * FROM person");
    while (query.next()) {
        int id = query.value(0).toInt();
        QString name = query.value(1).toString();
        qDebug() << "ID:" << id << "Name:" << name;
    }

    // 关闭数据库连接
    db.close();

    return a.exec();
}