com.esri.arcgis.geodatabase
Interface IClassSchemaEdit3

All Superinterfaces:

IClassSchemaEdit, IClassSchemaEdit2, Serializable

All Known Implementing Classes:

IClassSchemaEdit3Proxy, ObjectClass

public interface IClassSchemaEdit3
extends IClassSchemaEdit2, Serializable

Provides access to members that modify an object class's extension properties.

Remarks

This interface can be used to add and delete fields of type GlobalID to a feature class or table.

A GlobalID value is an ArcGIS assigned ID value for a row that is set when the row is created. The GlobalID value is guaranteed to be unique at the time of creation across all geodatabases. An ObjectID value is also an ArcGIS assigned ID value for a row that is assigned when the row is created. The ObjectID value is guaranteed to be unique across all rows and across all versions of the table containing the row. It is not guaranteed to be unique across tables within a geodatabase or between geodatabases.

The GlobalID value can be used to correlate rows in different geodatabases. Processes such as replication, copy, extract, checkout, checkin, data changes import and data changes export preserve GlobalIDs. If two rows from different geodatabases have the same GlobalID then they are interpreted to be different representations of the same 'real world' entity or relationship. Applications that use GlobalIDs to match rows between different geodatabases may add additional criteria such as matching table names to factor in possible schema changes.

These fields are not editable and only one GlobalID column can exist per table. An alternative to adding a new GlobalID field is to register an existing GUID field as a GlobalID field, using the IClassSchemaEditEx interface.

GlobalID columns are required for replication and data exchange. Details on how to prepare data for replication can be found in the ArcGIS Desktop Web Help article, IReplicationAgent and IGeoDataServer interfaces, and the DataChangesExporter and DataChangesImporter classes (all can be found in the Geodatabase Distributed library) for more information about the APIs for these processes.

As with other schema editing operations, an exclusive schema lock should be acquired for a dataset prior to adding or deleted a GlobalID field.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Method Summary

void	addGlobalID(String fieldName) Adds a global ID column to a class and populates it with GUIDs.
void	deleteGlobalID() Deletes the global ID column.

Methods inherited from interface com.esri.arcgis.geodatabase.IClassSchemaEdit2

alterClassExtensionProperties

Methods inherited from interface com.esri.arcgis.geodatabase.IClassSchemaEdit

alterAliasName, alterClassExtensionCLSID, alterDefaultValue, alterDomain, alterFieldAliasName, alterFieldModelName, alterInstanceCLSID, alterModelName, registerAsObjectClass

Method Detail

addGlobalID

void addGlobalID(String fieldName)
                 throws IOException,
                        AutomationException

Adds a global ID column to a class and populates it with GUIDs.

Remarks

Adds a column of type GlobalID to a Geodatabase table or feature class.

GlobalID columns can be added or deleted to versioned as well as non-versioned ArcSDE tables. In ArcSDE, GlobalID columns can be added to tables that already have data. With Personal or File Geodatabases, however, the tables must have no rows otherwise an error is generated when trying to add the column.

Attempts to add these columns for non-supported data sources like shapefile and coverages fail with errors.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Supported Platforms

Windows, Solaris, Linux

Parameters:

fieldName - The fieldName (in)

Throws:

IOException - If there are interop problems.

AutomationException - If the ArcObject component throws an exception.

deleteGlobalID

void deleteGlobalID()
                    throws IOException,
                           AutomationException

Deletes the global ID column.

Remarks

Deletes a column of type GlobalID to a Geodatabse Table or FeatureClass.

GlobalID columns can be added or deleted to versioned as well as non-versioned ArcSDE tables.

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Supported Platforms

Windows, Solaris, Linux

Throws:

IOException - If there are interop problems.

AutomationException - If the ArcObject component throws an exception.