qt实现数据库的增删

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

void insertData() {
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("example.db");

    if (!db.open()) {
        qDebug() << "无法打开数据库:" << db.lastError().text();
        return;
    }

    QSqlQuery query;
    query.prepare("INSERT INTO users (name, age) VALUES (:name, :age)");
    query.bindValue(":name", "Alice");
    query.bindValue(":age", 30);

    if (!query.exec()) {
        qDebug() << "插入数据失败:" << query.lastError().text();
    } else {
        qDebug() << "插入数据成功";
    }

    db.close();
}

void deleteData() {
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("example.db");

    if (!db.open()) {
        qDebug() << "无法打开数据库:" << db.lastError().text();
        return;
    }

    QSqlQuery query;
    query.prepare("DELETE FROM users WHERE name = :name");
    query.bindValue(":name", "Alice");

    if (!query.exec()) {
        qDebug() << "删除数据失败:" << query.lastError().text();
    } else {
        qDebug() << "删除数据成功";
    }

    db.close();
}

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

    insertData();
    deleteData();

    return a.exec();
}