使用QtSQL创建数据库表，但不执行查询

#include <QtSql>

QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName("mydatabase.db");
if (!db.open()) {
    qDebug() << "Failed to connect to database.";
    return;
}

QSqlQuery query;
query.exec("CREATE TABLE IF NOT EXISTS mytable (id INT PRIMARY KEY, name VARCHAR(30), age INT)");

db.close();

#include <QtSql>
#include <QDebug>

int main() {
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName("mydatabase.db");
    if (!db.open()) {
        qDebug() << "Failed to connect to database.";
        return 0;
    }

    QSqlQuery query;
    query.exec("CREATE TABLE IF NOT EXISTS mytable (id INT PRIMARY KEY, name VARCHAR(30), age INT)");

    db.close();

    return 0;
}