Relational table model example

Translated relational table model example from C++ using population data instead employee data

Task-number: PYSIDE-841
Change-Id: I493a7106275609edefdc4e140c9c9cc667a9c10f
Reviewed-by: Cristian Maureira-Fredes <cristian.maureira-fredes@qt.io>
(cherry picked from commit 6a9acbf1e94402161765e18e48f243b459379e77)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

2 files changed, 170 insertions, 0 deletions

diff --git a/examples/sql/relationaltablemodel/connection.py b/examples/sql/relationaltablemodel/connection.py
new file mode 100644
index 000000000..8a4e8f5db
--- /dev/null
+++ b/examples/sql/relationaltablemodel/connection.py
@@ -0,0 +1,55 @@
+#############################################################################
+##
+## Copyright (C) 2021 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide6 port of the relationaltablemodel example from Qt v6.x"""
+
+
+from PySide6.QtSql import QSqlDatabase
+
+
+def createConnection():
+
+    def check(func, *args):
+        if not func(*args):
+            raise ValueError(func.__self__.lastError())
+    db = QSqlDatabase.addDatabase("QSQLITE")
+    db.setDatabaseName(":memory:")
+
+    check(db.open)
diff --git a/examples/sql/relationaltablemodel/relationaltablemodel.py b/examples/sql/relationaltablemodel/relationaltablemodel.py
new file mode 100644
index 000000000..a25d28799
--- /dev/null
+++ b/examples/sql/relationaltablemodel/relationaltablemodel.py
@@ -0,0 +1,115 @@
+
+#############################################################################
+##
+## Copyright (C) 2021 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+"""PySide6 port of the relationaltablemodel example from Qt v6.x"""
+
+import sys
+
+import connection
+
+from PySide6.QtCore import QObject, Qt
+from PySide6.QtSql import (QSqlQuery, QSqlRelation, QSqlRelationalDelegate,
+                           QSqlRelationalTableModel)
+from PySide6.QtWidgets import QApplication, QTableView
+
+
+def initializeModel(model):
+
+    model.setTable("employee")
+    model.setEditStrategy(QSqlRelationalTableModel.OnManualSubmit)
+    model.setRelation(2, QSqlRelation("city", "id", "name"))
+    model.setRelation(3, QSqlRelation("country", "id", "name"))
+    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"))
+
+    model.select()
+
+
+def createView(title, model):
+
+    table_view = QTableView()
+    table_view.setModel(model)
+    table_view.setItemDelegate(QSqlRelationalDelegate(table_view))
+    table_view.setWindowTitle(title)
+
+    return table_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')")
+
+
+if __name__ == "__main__":
+    app = QApplication(sys.argv)
+
+    connection.createConnection()
+    createRelationalTables()
+
+    model = QSqlRelationalTableModel()
+
+    initializeModel(model)
+
+    title = "Relational Table Model"
+
+    window = createView(title, model)
+    window.resize(600, 200)
+    window.show()
+
+    sys.exit(app.exec())