qt数据库编程实例

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

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

    // 创建或打开SQLite数据库
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("example.db");

    if (!db.open()) {
        qDebug() << "无法打开数据库:" << db.lastError().text();
        return 1;
    }

    // 创建表
    QSqlQuery query;
    query.exec("CREATE TABLE IF NOT EXISTS users ("
               "id INTEGER PRIMARY KEY AUTOINCREMENT, "
               "name TEXT NOT NULL, "
               "email TEXT NOT NULL)");

    // 插入数据
    query.prepare("INSERT INTO users (name, email) VALUES (:name, :email)");
    query.bindValue(":name", "张三");
    query.bindValue(":email", "zhangsan@example.com");
    if (!query.exec()) {
        qDebug() << "插入数据失败:" << query.lastError().text();
    }

    // 查询数据
    query.exec("SELECT * FROM users");
    while (query.next()) {
        int id = query.value(0).toInt();
        QString name = query.value(1).toString();
        QString email = query.value(2).toString();
        qDebug() << "ID:" << id << "Name:" << name << "Email:" << email;
    }

    return a.exec();
}