localstorage.qml Example File

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 import QtQuick 2.5
 import QtQuick.Window 2.2
 import QtQuick.Layouts 1.1
 import QtQuick.LocalStorage 2.0
 import "Database.js" as JS

 Window {
     visible: true
     width: Screen.width / 2
     height: Screen.height / 1.8
     color: "#161616"

     property bool creatingNewEntry: false
     property bool editingEntry: false

     Rectangle {
         anchors.fill: parent

         ColumnLayout {
             anchors.fill: parent

             Header {
                 id: input
                 Layout.fillWidth: true
             }
             RowLayout {
                 MyButton {
                     text: "New"
                     onClicked: {
                         input.initrec_new()
                         creatingNewEntry = true
                         listView.model.setProperty(listView.currentIndex, "id", 0)
                     }
                 }
                 MyButton {
                     id: saveButton
                     enabled: (creatingNewEntry || editingEntry) && listView.currentIndex != -1
                     text: "Save"
                     onClicked: {
                         var insertedRow = false;
                         if (listView.model.get(listView.currentIndex).id < 1) {
                             //insert mode
                             if (input.insertrec()) {
                                 // Successfully inserted a row.
                                 input.setlistview()
                                 insertedRow = true
                             } else {
                                 // Failed to insert a row; display an error message.
                                 statustext.text = "Failed to insert row"
                             }
                         } else {
                             // edit mode
                             input.setlistview()
                             JS.dbUpdate(listView.model.get(listView.currentIndex).date,
                                         listView.model.get(listView.currentIndex).trip_desc,
                                         listView.model.get(listView.currentIndex).distance,
                                         listView.model.get(listView.currentIndex).id)
                         }

                         if (insertedRow) {
                             input.initrec()
                             creatingNewEntry = false
                             editingEntry = false
                             listView.forceLayout()
                         }
                     }
                 }
                 MyButton {
                     id: editButton
                     text: "Edit"
                     enabled: !creatingNewEntry && !editingEntry && listView.currentIndex != -1
                     onClicked: {
                         input.editrec(listView.model.get(listView.currentIndex).date,
                                       listView.model.get(listView.currentIndex).trip_desc,
                                       listView.model.get(listView.currentIndex).distance,
                                       listView.model.get(listView.currentIndex).id)

                         editingEntry = true
                     }
                 }
                 MyButton {
                     id: deleteButton
                     text: "Delete"
                     enabled: !creatingNewEntry && listView.currentIndex != -1
                     onClicked: {
                         JS.dbDeleteRow(listView.model.get(listView.currentIndex).id)
                         listView.model.remove(listView.currentIndex, 1)
                         if (listView.count == 0) {
                             // ListView doesn't automatically set its currentIndex to -1
                             // when the count becomes 0.
                             listView.currentIndex = -1
                         }
                     }
                 }
                 MyButton {
                     id: cancelButton
                     text: "Cancel"
                     enabled: (creatingNewEntry || editingEntry) && listView.currentIndex != -1
                     onClicked: {
                         if (listView.model.get(listView.currentIndex).id === 0) {
                             // This entry had an id of 0, which means it was being created and hadn't
                             // been saved to the database yet, so we can safely remove it from the model.
                             listView.model.remove(listView.currentIndex, 1)
                         }
                         listView.forceLayout()
                         creatingNewEntry = false
                         editingEntry = false
                         input.initrec()
                     }
                 }
                 MyButton {
                     text: "Exit"
                     onClicked: Qt.quit()
                 }
             }
             Component {
                 id: highlightBar
                 Rectangle {
                     width: listView.currentItem.width
                     height: listView.currentItem.height
                     color: "lightgreen"
                 }
             }
             ListView {
                 id: listView
                 Layout.fillWidth: true
                 Layout.fillHeight: true
                 model: MyModel {}
                 delegate: MyDelegate {}
                 // Don't allow changing the currentIndex while the user is creating/editing values.
                 enabled: !creatingNewEntry && !editingEntry

                 highlight: highlightBar
                 highlightFollowsCurrentItem: true
                 focus: true

                 header: Component {
                     Text {
                         text: "Saved activities"
                     }
                 }
             }
             Text {
                 id: statustext
                 color: "red"
                 Layout.fillWidth: true
                 font.bold: true
                 font.pointSize: 20

             }
         }
     }
     Component.onCompleted: {
         JS.dbInit()
     }
 }