FDO RFC 25 - King.Informix FDO Provider

This page contains a request for comments document (RFC) for the FDO Open Source project. More FDO RFCs can be found on the RFCs page.

Status

RFC Template Version	(1.0)
Submission Date	2008-07-29
Last Modified	Jason Birch 2008-07-29
Author	Haris Kurtagic, Simon Pelicon, Jason Birch
RFC Status	Draft - NOT READY FOR REVIEW
Implementation Status	not started
Proposed Milestone	3.4.0
Assigned PSC guide(s)	Jason
Voting History
+1
+0
-0
-1

Overview

The purpose of this RFC is the introduction of a dedicated FDO provider for the Informix Spatial DataBlade Module into the FDO project.

Motivation

Informix is a widely used and database solution for spatial applications, and is a highly desirable format for FDO to support. There is a large amount of corporate data housed in Informix Spatial DataBlade, and this provider will allow FDO-based applications to publish and manage that data.

Proposed Solution

The initial set of functionality for this provider will include

• Support for all geometries
• Support for three-dimensionals
• Support for a large set of spatial and attribute filters
• Support for select/sqlcommand/insert/update/delete

Specific capabilities include

Connection

• ThreadCapability: PerConnectionThreaded
• SpatialContextExtent: Static
• SupportsLocking: : false
• SupportsTimeout: : false
• SupportsTransactions: : false
• SupportsLongTransactions: : false
• SupportsSQL: : true
• SupportsConfiguration: : true

Schema

• Class
  • FeatureClass
  • Class
• Data
  • Boolean
  • Byte
  • DateTime
  • Decimal
  • Double
  • Int16
  • Int32
  • Int64
  • Single
  • String
• SupportsInheritance: false
• SupportsMultipleSchemas: true
• SupportsObjectProperties: false
• SupportsAssociationProperties: false
• SupportsSchemaOverrides: true
• SupportsNetworkModel: false
• SupportsAutoIdGeneration: true
• SupportsDataStoreScopeUniqueIdGeneration: false
• SupportedAutoGeneratedTypes
  • Int32
• SupportsSchemaModification: true

Command

• SupportedCommands
  • Select
  • SQLCommand
  • DescribeSchema
  • GetSpatialContexts
  • CreateSpatialContext
  • Insert
  • Update
  • Delete
  • ApplySchema
• SupportsParameters: true
• SupportsTimeout: false
• SupportsSelectExpressions: true
• SupportsSelectFunctions: true
• SupportsSelectDistinct: true
• SupportsSelectOrdering: true
• SupportsSelectGrouping: true

Filter

• Condition
  • Comparison
  • Like
  • In
  • Null
  • Spatial
• Spatial
  • Contains
  • Crosses
  • Disjoint
  • Equals
  • Intersects
  • Overlaps
  • Touches
  • Within
  • CoveredBy
  • Inside
  • EnvelopeIntersects
• SupportsGeodesicDistance: false
• SupportsNonLiteralGeometricOperations: false

Expression

• Basic
• Function
  • Ceil
  • Floor
  • Sum
  • Count
  • Min
  • Avg
  • Max
  • SpatialExtents
  • Lower
  • Upper
  • Concat

Raster

• SupportsRaster: false
• SupportsStitching: false
• SupportsSubsampling: false

Topology

• SupportsTopology: false
• SupportsTopologicalHierarchy: false
• BreaksCurveCrossingsAutomatically: false
• ActivatesTopologyByArea: false
• ConstrainsFeatureMovements: false

Geometry

• Types
  • Point
  • LineString
  • Polygon
  • MultiPoint
  • MultiLineString
  • MultiPolygon
  • MultiGeometry
  • CurveString
  • CurvePolygon
  • MultiCurveString
  • MultiCurvePolygon
• Components
  • LinearRing
  • ArcSegment
  • CurveRing
• Dimensionality: 3

Limitations

TBA

Implications

This provider does not require any API changes to the FDO core or other providers. It will need to be added to the standard build and test procedures, and the process for acquiring the Informix DLLs will need to be documented.

Test Plan

TBA

Funding/Resources

The resources for this provider are being contributed by IBM and SL-King.

References

Spatial DataBlade introduction: ​http://www-306.ibm.com/software/data/informix/blades/spatial/ Spatial DataBlade manual: ​http://publib.boulder.ibm.com/infocenter/idshelp/v10/index.jsp?topic=/com.ibm.spatial.doc/spat.htm