CL_EAMS_VB_ESRI_LAYER_QUERY - Retrieve Data from ESRI MapService WS with JSON Form

rdisp/max_wprun_time - Maximum work process run time   CL_GUI_FRONTEND_SERVICES - Frontend Services  
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Functionality

This class provides functionality to retrieve point geometry like data as geo coordinates and otherobject attributes based on object identifier from ESRI "MapServer" web service using map sub-layers as external data sources.

Relationships

Related customizing

Map sub-layers as external data sources can be defined by maintaining EAMS_CVBEXTDS in SM30.

Defining a sub-layer covers the following:

Key attribute field name whose value identifies objects on sub-layer uniquely,

• Business system ID that joins internal (ERP) and external (ESRI) object ID and sets mapping validation limits per system,

• Data source rank put precedence over different data source when the same external object ID relates more than one sub-layer,

• Sub-layer ID: identifies one layer within range of a "MapServer" web service, moreover description can be added for it,

• RFC destination define access to "MapServer" web service and

• Technical object type and category make more strait relationship between technical object and its external attributes.

Example

RETRIEVE_DATA retrieves geo coordinates and external attributes from sub-layers.

CREATE_DATASOURCE_REFERENCE facilitates access to data sources based on customizing with help of CREATE_HTTP_CLIENT_BY_RFCDEST.

MAP_OBJECTID_TO_DATASOURCE combines object ID from internal-external ID mapping with external data sources.

FETCH_DATA provides data sets for RETRIEVE_DATA based on outcome of MAP_OBJECTID_TO_DATASOURCE.

MAP_FIELDS_QUERY construct URL query parameters.

CONVERT_XSTRING_TO_STRING convert JSON formed response string provided by RETRIEVE_DATA_JSON.

CONVERT_DATA_FROM_JSON fills internal tables of geo coordinates and other attributes by parsing JSON response string.

CHECK_ERROR_IN_JSON inspect errors in JSON response string.

Notes

• ESRI web service is queried using JSON form.

• Point geometry like data as geo coordinates measured in WGS 84 (WKID: 4326).

• version 9.3 is used when querying against ArcGIS REST API.

Further information

rdisp/max_wprun_time - Maximum work process run time   Vendor Master (General Section)  
This documentation is copyright by SAP AG.


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