Dekho queries

Agenda

• Introduction to Dekho queries

• Query types and how to use them

• Spatially enabled queries

• Best practices and considerations

Complete the picture… with queries..

Dekho queries • Pull information from data sources

– Internal / External – Database / Web service / Map service

• Defined in Dekho Studio • Executed in runtime by end user

• Require some SQL skills

• Reusable between applications

Query sources

• JDBC connection

• Esri ArcGIS Server Map Service (GDB Only)

• Web Service

Query types • Searching

– Search

– Combo + Type-Ahead

• Result viewing

– Layer Information Query

– Feature Info Query

• Others

– Call out

– Integration

1

2

3

Defining a Search Query • Always executed against a feature class in the GDB

• Returning a single spatial feature set (ObjectID)

• User interaction – data entry fields (optional)

Select * from [Feature Class] Where [User data entry]

Select * from properties Where street_name like %Manningtree%

User data entry fields • Go into the “Where

clause” of the search SQL statement

• Text / Date / List / Drop Down

Type-ahead Combo-box

Combo and Type-ahead • Structure user data entry in search queries

• ANY database (not just the GDB)

• Lists Of Values (LOV): – Value = What you display

– ID = What you use

• Ordered (? Your call…)

ID Value

Vic Victoria

NSW New South Wales

Tas Tasmania

WA West Australia

SA South Australia

NT Northern Territory

Search #2

Reusing Combo and Type-ahead

• Define once and reuse

Combo-Box Query

Search #1 Search #3

Working with search results • Working with a complete picture

• Connecting with non-spatial data sources

• Getting the information you need

ObjectID ObjectID

ObjectID ObjectID

ObjectID ObjectID

ObjectID ObjectID

LIQ’s and FIQ’s

Layer Information

Specific feature Information

Getting the information you need

Asset Mgmt System

Asset ID

GDB

Current Selected Feature

The information I wish to display

Getting the information you need

ObjectID AssetID

AID

Asset Mgmt System

Asset ID

GDB ObjectID

Foreign Asset Id KEY

AssetID

GDB link to 3rd party systems

Getting the information you need

ObjectID AssetID

AID X Y Z

What Dekho does: 1. Get AssetId by ObjectID (GDB)

2. Find row in AMS table based on AssetID

3. Select relevant fields (X,Y,Z)

Getting the data you need

Asset Mgmt System

Asset ID

GDB

ObjectID+AssetID

Mapping relationship SELECTION.AssetID = AMS.AssetID

LIQ’s and FIQ’s

Multiple queries span across multiple tabs

Example: reviewing a property

Owners history list

Related approvals

Lot # information

FIQ1 FIQ2 FIQ3

Queries and maps

Query types • Searching

– Search

– Combo + Typeahead

• Result viewing

– Layer Information Query

– Feature Info Query

• Others

– Call out

– Integration

Callout Query

• Any data source

• Select relevant fields

Dekho Integration Query

• SQL query that translates one set of values (OBJECTID) to another (ASSETID)

Dekho Integration Query

Dekho Integration Query

Query types • Searching

– Search

– Combo + Typeahead

• Result viewing

– Layer Information Query

– Feature Info Query

• Others

– Call out

– Integration

Spatial selection

I want users to search a heritage site and see properties

that intersect with the selected heritage site

Spatial selection

Heritage site layer

Property lot layer

Spatial query

Search query

Queries points for consideration

Remember!! • Spatial query is optional

– Search query

– Feature Info query

• Results are from the TARGET layer

Queries points for consideration • Renaming DB fields names to logical names

select Field_Name1 as “User Friendly Name1”

• Complete the picture vs. Information overload – Avoid select * statements

– Use multiple FIQ’s and LIQ’s

– Map to end user workflow

• Query performance optimization

Complete the picture… with queries..

Product Information:

www.esriaustralia.com.au/dekho

www.esriaustralia.com.au/dekhohelp

www.esriaustralia.com.au/dekhoblog