Question

I use this code.

model  = new QSqlQueryModel(this);
model->setQuery("select id,parent,name from table");

tree = new QTreeView(this);
tree->setModel(model);

In TreeView displays table, but not tree. How to display tree?

Answer 1

Well, it wouldn’t return a tree as the QSqlQueryModel results in a flat table which is what comes out of the database.

You have two options for making it into a tree view, create your own model either through subclassing or just build a QStandardItemModel, or use an QAbstractProxyModel to create the mapping between your QSqlQuery table result to your grouped tree data model.