A data source using an app does not not to start
I'm adopting the tutorial: https://developer.blackberry.com/cascades/documentation/device_platform/data_access/using_data_sourc... at my request. The only difference is that my app is based on the tabs. Following however to add lines in my file qml, makes the application crashes the gray screen with BB10 logo.
Tab {
title: "edit list"
imageSource: "asset:///images/note.png"
content: Page {
titleBar: TitleBar {
title: "editing list: " + workingOnList
visibility: ChromeVisibility.Visible
}
Container {
id: view
ListView {
layout: StackListLayout {
}
preferredWidth: 640.0
// Associate the list view with the data model that's defined in the
// attachedObjects list
dataModel: dataModel
listItemComponents: [
ListItemComponent {
type: "item"
// Use a standard list item to display the data in the model
StandardListItem {
title: ListItemData.category_name
}
} // end of ListItemComponent
]
}
attachedObjects: [
GroupDataModel {
id: dataModel
},
DataSource {
id: dataSource
// Load the data from an SQL database, based on a specific query
source: "database.db"
query: "select * from categories"
onDataLoaded: {
// After the data is loaded, insert it into the data model
dataModel.insertList(data);
}
} // end of DataSource
]
onCreationCompleted: {
// After the root Page is created, direct the data source to start
// loading data
dataSource.load();
}
}
}
}
The only differences are: code is pasted in the {} instead of {Page} tab, and of course, the name of the database, the columns are changed.
I added bb.data 1.0 import statement in the file .qml, the .pro file was also changed according to the tutorial. Path to the database file is correct.
You have an idea, why this is happening?
Another issue related to the data source:
my main.qml file:
Page {
id: mainScreen
titleBar: TitleBar {
title: "your lists"
visibility: ChromeVisibility.Visible
}
Container {
ListView {
id: allListsView
objectName: "allLists"
layout: StackListLayout {
headerMode: ListHeaderMode.Sticky
}
dataModel: allListsModel
listItemComponents: [
ListItemComponent {
type: "item"
StandardListItem {
title: ListItemData.list_name
}
},
ListItemComponent {
type: "header"
Header {
title: ListItemData
}
}
]
onTriggered: {
select(indexPath);
var page = listPage.createObject();
nav.push(page);
}
}
attachedObjects: [
ComponentDefinition {
id: listPage
source: "listPreview.qml"
},
GroupDataModel {
id: allListsModel
grouping: ItemGrouping.ByFirstChar
sortingKeys: ["list_name"]
},
DataSource {
id: allListsSource
source: "database.db"
query: "select * from lists"
onDataLoaded: {
allListsModel.insertList(data);
}
}
]
onCreationCompleted: {
allListsSource.load();
}
}
New screen grows without any problem after clicking on list items. But when I add the following lines to listPreview.qml, application stucks selection list item and nothing happens.
Page {
content: ListView {
id: myListView
dataModel: dataModel
listItemComponents: [
ListItemComponent {
type: "item"
StandardListItem {
title: ListItemData.article_name
}
}
]
}
attachedObjects: [
GroupDataModel {
id: dataModel
},
DataSource {
id: dataSource
source: "database.db"
query: "select * from articles"
onDataLoaded: {
dataModel.insertList(data);
}
}
]
onCreationCompleted: {
dataSource.load();
}
}
It looks like I can not query the DB for the second time 
commenting on the DataSource {...} of listPreview.qml pushed the new app screen without any problems.
EDIT:
a simple solution: I forgot to add the statement import bb.data 1.0 in listPreview.qml
Tags: BlackBerry Developers
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