CDBREAD Class

CDBREAD Class

The DBREAD class is used to open and read from databases. Very large lines are split into blocks and served up sequentially to prevent the over-use of virtual memory when channels are read into VVs or VAs. Individual data blocks are limited by default to 1 MB (which is user-alterable). Single lines smaller than the block size are served up whole, one block per line.

Inheritance Hierarchy

SystemObject
GeoEngine.Core.GXNetCHANDLE
GeoEngine.Core.GXNetCDBREAD

Namespace: GeoEngine.Core.GXNet
Assembly: geoengine.core.gxnet (in geoengine.core.gxnet.dll)

Syntax

C++

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public class CDBREAD : CHANDLE

Public Class CDBREAD
	Inherits CHANDLE

public ref class CDBREAD : public CHANDLE

type CDBREAD =  
    class
        inherit CHANDLE
    end

The CDBREAD type exposes the following members.

Methods

	Name	Description
	Create	Create a DBREAD object Add channels using the iAddChannel_DBREAD() method.channel.
	CreateXY	Create a DBREAD object for a XY-located data. Add channels using the iAddChannel_DBREAD() method.
	CreateXYZ	Create a DBREAD object for a XYZ-located data. Add channels using the iAddChannel_DBREAD() method.channel
	Dispose	Releases the unmanaged resources used by the CDBREAD and optionally releases the managed resources (Overrides CHANDLEDispose(Boolean).)
	GetVA	Get the VA handle for an array channel.
	GetVV	Get the VV handle for a channel.
	GetVVx	Get the X channel VV handle.
	GetVVy	Get the Y channel VV handle.
	GetVVz	Get the Z channel VV handle.
	iAddChannel	Add a data channel to the DBREAD object.
	iGetChanArraySize	Get the number of columns of data in a channel.
	iGetNextBlock	Get the next block of data.
	iGetNumberOfBlocksToProcess	Get the number of blocks to be served up.

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Reference

GeoEngine.Core.GXNet Namespace