load table inside constructor

[sattu]

hi everyone,
I want to load a table inside the constructor .But it is not working.The same thing when i do under a push Button clicked it is working.My code is :

QSqlQueryModel *abc =new QSqlQueryModel;
    abc->setQuery("select * form User10");
    ui->tableView_User10->setModel(abc);

QSqlQueryModel *abc =new QSqlQueryModel;
    abc->setQuery("select * form User10");
    ui->tableView_User10->setModel(abc);

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plz give some soln.