qt mysql条件查询

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

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

    // 连接数据库
    QSqlDatabase db = QSqlDatabase::addDatabase("QMYSQL");
    db.setHostName("localhost");
    db.setDatabaseName("testdb");
    db.setUserName("username");
    db.setPassword("password");

    if (!db.open()) {
        qDebug() << "Database error:" << db.lastError().text();
        return -1;
    }

    // 条件查询
    QSqlQuery query;
    query.prepare("SELECT * FROM users WHERE age > :age");
    query.bindValue(":age", 25);

    if (query.exec()) {
        while (query.next()) {
            qDebug() << "Name:" << query.value("name").toString()
                     << "Age:" << query.value("age").toInt();
        }
    } else {
        qDebug() << "Query error:" << query.lastError().text();
    }

    return a.exec();
}