Qt 5.9 | Qt SQL | Query Model Example | editablesqlmodel.cpp Example File

Qt 5.9.9 Reference Documentation

# editablesqlmodel.cpp Example File

querymodel/editablesqlmodel.cpp

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      #include <QtSql>

      #include "editablesqlmodel.h"

      EditableSqlModel::EditableSqlModel(QObject *parent)
          : QSqlQueryModel(parent)
      {
      }

      Qt::ItemFlags EditableSqlModel::flags(
              const QModelIndex &index) const
      {
          Qt::ItemFlags flags = QSqlQueryModel::flags(index);
          if (index.column() == 1 || index.column() == 2)
              flags |= Qt::ItemIsEditable;
          return flags;
      }

      bool EditableSqlModel::setData(const QModelIndex &index, const QVariant &value, int /* role */)
      {
          if (index.column() < 1 || index.column() > 2)
              return false;

          QModelIndex primaryKeyIndex = QSqlQueryModel::index(index.row(), 0);
          int id = data(primaryKeyIndex).toInt();

          clear();

          bool ok;
          if (index.column() == 1) {
              ok = setFirstName(id, value.toString());
          } else {
              ok = setLastName(id, value.toString());
          }
          refresh();
          return ok;
      }

      void EditableSqlModel::refresh()
      {
          setQuery("select * from person");
          setHeaderData(0, Qt::Horizontal, QObject::tr("ID"));
          setHeaderData(1, Qt::Horizontal, QObject::tr("First name"));
          setHeaderData(2, Qt::Horizontal, QObject::tr("Last name"));
      }

      bool EditableSqlModel::setFirstName(int personId, const QString &firstName)
      {
          QSqlQuery query;
          query.prepare("update person set firstname = ? where id = ?");
          query.addBindValue(firstName);
          query.addBindValue(personId);
          return query.exec();
      }

      bool EditableSqlModel::setLastName(int personId, const QString &lastName)
      {
          QSqlQuery query;
          query.prepare("update person set lastname = ? where id = ?");
          query.addBindValue(lastName);
          query.addBindValue(personId);
          return query.exec();
      }