SqliteManager | Sqlite Manager is a Dev Debug tool | Database library

#include "QString"
#include "QFile"
#include "QDataStream"
#include "qdebug.h"
#include "QtSql"
#include "QSqlDatabase"
#include "qmessagebox.h"

class User
{
protected:
QString name;
QList childrens;

public:
QString getName(){ return name;}
QList getChildrens(){ return childrens;}

void setName(QString x) {name = x;}
void setChildrens(QList x) {childrens = x;}



friend QDataStream &operator<<(QDataStream &out, const User &t)
{
    out << t.name << t.childrens;
    return out;
}

friend QDataStream &operator>>(QDataStream &in, User &t)
{
    QString inname;
    QList inchildrens;
    in >> inname >> inchildrens;
    t.name = inname;
    t.childrens = inchildrens;
    return in;
}
QByteArray object2blob( const User& user )
{
  QByteArray result;
  QDataStream bWrite( &result, QIODevice::WriteOnly );
  bWrite << user;

  return result;

}
User blob2object( const QByteArray& buffer )
{
  User result;
  QDataStream bRead( buffer );
  bRead >> result;

  return result;
}
int saveToDB( const User& user )
{
    QSqlDatabase myDB = QSqlDatabase::addDatabase("QSQLITE");
    myDB.setDatabaseName( "file.db");
    if (!myDB.open())
    {
        qDebug()<<"Failed to open SQL database of registered users";
    }
    else
    {
        qDebug()<<"Successfully opening SQL database of registered users";
        QSqlQuery query;

        query.prepare( "CREATE TABLE IF NOT EXISTS users (name TEXT, childrens BLOB)" );
          if( !query.exec() )
          {
            qDebug() << query.lastError();
          }
          else
          {
            qDebug() << "Table created!";
            query.prepare( "INSERT INTO users (name,childrens) VALUES (:name,:childrens)" );
            query.bindValue(":name", name);
            query.bindValue( ":childrens",  object2blob(user) );
            query.exec();
          }
        query.clear();
        myDB.close();
    }
    QSqlDatabase::removeDatabase("UserConnection");

    return 0;
}
User readFromDB( QString name )
{
    User result;
    QSqlDatabase myDB = QSqlDatabase::addDatabase("QSQLITE");
    myDB.setDatabaseName( "file.db");
    if (!myDB.open())
    {
        qDebug()<<"Failed to open SQL database of registered users";
    }
    else
    {
        QSqlQuery query;

        query.prepare( "SELECT * FROM users WHERE name ='"+ name +"'" );
        //query.bindValue( 0, name );

        if ( query.exec() && query.next() ) {
          result = blob2object( query.value( 1 ).toByteArray() );
        }
        query.clear();
        myDB.close();
    }
    QSqlDatabase::removeDatabase("UserConnection");
    qDebug()<()<<"Jeanne"<<"Jean");
    u.saveToDB(u);

    User v;
    v.setName("Alex");
    v.setChildrens(QList()<<"Matthew");
    v.saveToDB(v);

    User w;
    w.setName("Mario");
    w.saveToDB(w);

    User to_read; //to improve here
    User a = to_read.readFromDB("Georges");

    qDebug()<