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from PySide2.QtGui import *
from PySide2.QtSql import *

def initializeModel(model):
//! [0]
    model.setTable("employee")
//! [0]

    model.setEditStrategy(QSqlTableModel.OnManualSubmit)
//! [1]
    model.setRelation(2, QSqlRelation("city", "id", "name"))
//! [1] //! [2]
    model.setRelation(3, QSqlRelation("country", "id", "name"))
//! [2]

//! [3]
    model.setHeaderData(0, Qt.Horizontal, QObject::tr("ID"))
    model.setHeaderData(1, Qt.Horizontal, QObject::tr("Name"))
    model.setHeaderData(2, Qt.Horizontal, QObject::tr("City"))
    model.setHeaderData(3, Qt.Horizontal, QObject::tr("Country"))
//! [3]

    model.select()


def createView(title, model):
//! [4]
    view =  QTableView()
    view.setModel(model)
    view.setItemDelegate(QSqlRelationalDelegate(view))
//! [4]
    view.setWindowTitle(title)
    return view


def createRelationalTables():
    query = QSqlQuery()
    query.exec_("create table employee(id int primary key, name varchar(20), city int, country int)")
    query.exec_("insert into employee values(1, 'Espen', 5000, 47)")
    query.exec_("insert into employee values(2, 'Harald', 80000, 49)")
    query.exec_("insert into employee values(3, 'Sam', 100, 1)")

    query.exec_("create table city(id int, name varchar(20))")
    query.exec_("insert into city values(100, 'San Jose')")
    query.exec_("insert into city values(5000, 'Oslo')")
    query.exec_("insert into city values(80000, 'Munich')")

    query.exec_("create table country(id int, name varchar(20))")
    query.exec_("insert into country values(1, 'USA')")
    query.exec_("insert into country values(47, 'Norway')")
    query.exec_("insert into country values(49, 'Germany')")


def main():

    app = QApplication([])
    if !createConnection():
        return 1

    createRelationalTables()

    model = QSqlRelationalTableModel()

    initializeModel(model)

    view = createView(QObject.tr("Relational Table Model"), model)
    view.show()

    return app.exec_()