Feature Service
Detailed Description
The Feature Service provides an abstraction layer for the storage and retrieval of feature data in a technology-independent way. You can use the API to determine which storage technologies are available and which capabilities they have. Access to the storage technology is modeled as a connection. For example, you can connect to a file and do simple insertions or connect to a relational database and do transaction-based operations.The root methods are contained in the MgFeatureService class.
In general, you may do any of the following, subject to provider capability limitations:
- Determine which storage technologies are available (see MgFeatureService::GetFeatureProviders()),
- Determine which capabilities a feature provider has (see MgFeatureService::GetCapabilities()),
- Verify the connection property values (see MgFeatureService::GetConnectionPropertyValues()),
- Connect to a storage technology (feature provider) using either a resource identifier or a provider name and a connection string ,
- Describe the structure of feature data (see describe a feature schema ,
- Determine the spatial contexts available in the datastore (see MgFeatureService::GetSpatialContexts()),
- Insert feature data (see MgInsertFeatures),
- Select feature data (see MgFeatureService::SelectFeatures() and MgFeatureService::SelectAggregate()),
- Update feature data (see MgUpdateFeatures),
- Delete feature data (see MgDeleteFeatures),
- Execute SQL commands (see MgFeatureService::ExecuteSqlQuery() and MgFeatureService::ExecuteSqlNonQuery).
Modules | |
| Connection To a Feature Source | |
| Describing a Feature Schema | |
| Feature Provider Registry | |
| Filters and Expressions | |
| Provider Capabilities | |
| Feature Service Classes | |