I created a geodatabase via ArcGIS Runtime Content in ArcMap. I am trying to add it via this reference: Create an offline map—ArcGIS Runtime SDK for Qt | ArcGIS for Developers BUT map.addLayer does not exist or its giving me an error Any ideas? //Declare the geodatabase Geodatabase { id : geodatabase path : "/path_to_my_geodatabase/mydata.geodatabase" } FeatureLayer { id : featureLayer featureTable : geodatabase . geodatabaseFeatureTableByLayerId ( 0 ) ; } map . addLayer ( featureLayer ) ;

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Add layer from geodatabase file

jaykapalczynski

I created a geodatabase via ArcGIS Runtime Content in ArcMap.

I am trying to add it via this reference: Create an offline map—ArcGIS Runtime SDK for Qt | ArcGIS for Developers

BUT map.addLayer does not exist or its giving me an error

Any ideas?

<SPAN class="comment token">//Declare the geodatabase </SPAN>
Geodatabase <SPAN class="punctuation token">{</SPAN>
        id<SPAN class="punctuation token">:</SPAN> geodatabase
        path<SPAN class="punctuation token">:</SPAN> <SPAN class="string token">"/path_to_my_geodatabase/mydata.geodatabase"</SPAN>
    <SPAN class="punctuation token">}</SPAN>

FeatureLayer <SPAN class="punctuation token">{</SPAN>
        id<SPAN class="punctuation token">:</SPAN> featureLayer
        featureTable<SPAN class="punctuation token">:</SPAN> geodatabase<SPAN class="punctuation token">.</SPAN><SPAN class="token function">geodatabaseFeatureTableByLayerId</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="number token">0</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
    <SPAN class="punctuation token">}</SPAN>

map<SPAN class="punctuation token">.</SPAN><SPAN class="token function">addLayer</SPAN><SPAN class="punctuation token">(</SPAN>featureLayer<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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Accepted answers

ErwinSoekianto

Jay,

Based on the sample Feature Layer (Geodatabase),

- AppStudio Sample - arcgis-appstudio-samples/MyApp.qml at v4.0 · Esri/arcgis-appstudio-samples · GitHub

- ArcGIS Runtime Qt/QML Sample - Feature layer (geodatabase) | ArcGIS for Developers

You don't need to call addLayer if you initialize the FeatureLayer inside Map, that layer is already added.

Looping in ArcGIS Runtime SDK for Qt‌, to see why addLayer is throwing an error.

Thank you,

Erwin

All comments

LucasDanzinger

I think some of the concepts here are tripping you up a bit.

Geodatabase:

This is the container, similar to a File Geodatabase in desktop, which holds N number of feature tables (called "feature class" in the desktop).

GeodatabaseFeatureTable:

These live inside of the Geodatabase. This is the backing data, schema information, rendering info, and everything required to define each table of features. This is synonymous to a Feature Class in desktop

FeatureLayer:

This is the layer that does the display of a feature table. The feature table is the backing data (i.e. the model) and the feature layer is what displays on the map (i.e. the view)

So at a high level, what I would do is:

- Create a Geodatabase for each .geodatabase file you have.

- Load each Geodatabase and loop through each to obtain each feature table

- Create a feature layer from each feature table

- Add each feature layer to the map

- Somehow, store a reference to the specific layers you want to mention. The first idea that comes to mind is to store a json or some data structure that keeps track of the index position of the layer added to the map. In my snippet above where I call get and pass in 0, that is just getting the first item in the map. If you store the index for the specific layers you want to have visibility toggled for, you could hard code those in your button. If you instead wanted to be more dynamic and display a toggle checkbox for each layer in the map, you could create a ListView in QML code, and bind the model property directly to the map's operationalLayers list model, and each layer would display in the ListView.

LucasDanzinger

yes that is what this example does.

jaykapalczynski

So your example would read the geodatabase and create multiple Feature Layer objects to display the multiple features in the geodatabase?

LucasDanzinger

You could loop through the geodatabaseFeatureTables list:

Geodatabase <SPAN class="punctuation token">{</SPAN>
    id<SPAN class="punctuation token">:</SPAN> gdb
    path<SPAN class="punctuation token">:</SPAN> dataPath <SPAN class="operator token">+</SPAN> <SPAN class="string token">"geodatabase/LA_Trails.geodatabase"</SPAN>

    onErrorChanged<SPAN class="punctuation token">:</SPAN> console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">log</SPAN><SPAN class="punctuation token">(</SPAN>error<SPAN class="punctuation token">.</SPAN>message<SPAN class="punctuation token">)</SPAN>

    onLoadStatusChanged<SPAN class="punctuation token">:</SPAN> <SPAN class="punctuation token">{</SPAN>
        <SPAN class="keyword token">if</SPAN> <SPAN class="punctuation token">(</SPAN>loadStatus <SPAN class="operator token">===</SPAN> Enums<SPAN class="punctuation token">.</SPAN>LoadStatusLoaded<SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
            console<SPAN class="punctuation token">.</SPAN><SPAN class="token function">log</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"number of feature tables:"</SPAN><SPAN class="punctuation token">,</SPAN> geodatabaseFeatureTables<SPAN class="punctuation token">.</SPAN>length<SPAN class="punctuation token">)</SPAN>
            <SPAN class="keyword token">for</SPAN> <SPAN class="punctuation token">(</SPAN><SPAN class="keyword token">var</SPAN> i <SPAN class="operator token">=</SPAN> <SPAN class="number token">0</SPAN><SPAN class="punctuation token">;</SPAN> i <SPAN class="operator token"><</SPAN> geodatabaseFeatureTables<SPAN class="punctuation token">.</SPAN>length<SPAN class="punctuation token">;</SPAN> i<SPAN class="operator token">++</SPAN><SPAN class="punctuation token">)</SPAN> <SPAN class="punctuation token">{</SPAN>
                <SPAN class="keyword token">var</SPAN> ft <SPAN class="operator token">=</SPAN> geodatabaseFeatureTables<SPAN class="punctuation token">[</SPAN>i<SPAN class="punctuation token">]</SPAN><SPAN class="punctuation token">;</SPAN>
                <SPAN class="keyword token">var</SPAN> fl <SPAN class="operator token">=</SPAN> ArcGISRuntimeEnvironment<SPAN class="punctuation token">.</SPAN><SPAN class="token function">createObject</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="string token">"FeatureLayer"</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">{</SPAN>featureTable<SPAN class="punctuation token">:</SPAN> ft<SPAN class="punctuation token">}</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
                map<SPAN class="punctuation token">.</SPAN>operationalLayers<SPAN class="punctuation token">.</SPAN><SPAN class="token function">append</SPAN><SPAN class="punctuation token">(</SPAN>fl<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
            <SPAN class="punctuation token">}</SPAN>
        <SPAN class="punctuation token">}</SPAN>
    <SPAN class="punctuation token">}</SPAN>

    Component<SPAN class="punctuation token">.</SPAN>onCompleted<SPAN class="punctuation token">:</SPAN> <SPAN class="token function">load</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">)</SPAN>
<SPAN class="punctuation token">}</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

jaykapalczynski

Any idea how to read this geodatabase and or get a list of the features that it contains?

jaykapalczynski

Think I got it...THANK YOU SO MUCH.....

Seems I could not use

featureTable: gdb.geodatabaseFeatureTableByLayerId(4);

But had to use

featureTable: gdb.geodatabaseFeatureTablesByTableName["WMAs_1"];

import QtQuick 2.6
import QtQuick.Controls 2.2
import QtQuick.Layouts 1.3
import Esri.ArcGISRuntime 100.6
//import Esri.ArcGISExtras 1.1

Rectangle {
    id: navigateOnline
    width: 800
    height: 600

    property string errorMessage: ""
    signal previous(string message)
    property string lecaDataPath:  app.mmpkManager.fileUrl3

    // Map view UI presentation at top
    MapView {
        anchors.fill: parent

        Rectangle{
            id: stupidrectangle
            width: 300
            height: 50
            Column{
                id: searchBar22
                width: 300
                spacing: 0

               Text {
                  text: lecaDataPath
                  width: 300
                  wrapMode: Text.WordWrap
               }
            }
        }

        Map {
            id: map

            // set an initial viewpoint
            ViewpointCenter {
                Point {
                    x: -8778929
                    y: 44521052
                    spatialReference: SpatialReference { wkid: 3857 }
                }
                targetScale: 35e4
            }

            BasemapTopographic {}

            //! [FeatureLayer Geodatabase create]
            // create a feature layer
            FeatureLayer {
                // obtain the feature table from the geodatabase by name
                //featureTable: gdb.geodatabaseFeatureTableByLayerId(4);
                featureTable: gdb.geodatabaseFeatureTablesByTableName["WMAs_1"]

                // create the geodatabase
                Geodatabase {
                    id: gdb
                    path: lecaDataPath
                    onErrorChanged: errorMessage = error.message;
                }
                onErrorChanged: errorMessage = error.message;
            }
            onErrorChanged: errorMessage = error.message;
        }
        onErrorChanged: errorMessage = error.message;
    }

    Dialog {
        modal: true
        x: Math.round(parent.width - width) / 2
        y: Math.round(parent.height - height) / 2
        standardButtons: Dialog.Ok
        visible: text.length > 0
        property alias text : textLabel.text
        property alias informativeText : detailsLabel.text
        ColumnLayout {
            Text {
                id: textLabel
                text: errorMessage
            }
            Text {
                id: detailsLabel
                text: "Please consult the README.md"
            }
        }
    }
}
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jaykapalczynski

can I still reference the index of the gdb like this

featureTable: geodatabase.geodatabaseFeatureTableByLayerId(4);

OK going to test that now.  THANKS

LucasDanzinger

There is no addLayer method on Map. Instead, you can nest the layer inside the Map like you mentioned, or you can call map.operationalLayers.append(), and add the layer via that method LayerListModel QML Type | ArcGIS for Developers .

ErwinSoekianto

Jay,

Based on the sample Feature Layer (Geodatabase),

- AppStudio Sample - arcgis-appstudio-samples/MyApp.qml at v4.0 · Esri/arcgis-appstudio-samples · GitHub

- ArcGIS Runtime Qt/QML Sample - Feature layer (geodatabase) | ArcGIS for Developers

You don't need to call addLayer if you initialize the FeatureLayer inside Map, that layer is already added.

Looping in ArcGIS Runtime SDK for Qt‌, to see why addLayer is throwing an error.

Thank you,

Erwin

jaykapalczynski

Forgot to add I am using QML for AppStudio

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