ArcObjects Library Reference  (GeoDatabase)    

ISchemaLock Example 

[Visual Basic 6.0]
 The following example shows how you can use the ISchemLock interface to aquire an exclusive lock on an object class, before modifying its extension class COM component.
  
   ' open the workspace
   Dim pWSF As IWorkspaceFactory
   Set pWSF = New AccessWorkspaceFactory
   
   Dim pWS As IWorkspace
   Set pWS = pWSF.OpenFromFile("d:\data\testclsext2.mdb", 0)
   
   ' QI for IFeatureWorkspace
   Dim pFeatWS As IFeatureWorkspace
   Set pFeatWS = pWS
   
   ' open the object class whose class schema you want to modify
   Dim pOc As IObjectClass
   Dim pTab As ITable
   Set pTab = pFeatWS.OpenFeatureClass("buildings")
   Set pOc = pTab
   
   ' QI for the IClassSchemEdit interface
   Dim pOcSchemaEdit As IClassSchemaEdit
   Set pOcSchemaEdit = pOc
   
   ' set an exclusive lock on the class
   Dim pSchLock As ISchemaLock
   Set pSchLock = pOc
   pSchLock.ChangeSchemaLock (esriExclusiveSchemaLock)
   
   ' create the IUID object
   Dim pCUID As IUID
   Set pCUID = New UID
   pCUID.Value = "{484F435C-9A08-11D3-815A-0080C78E8371"
   
   ' alter the class extension for the class
   pOcSchemaEdit.AlterClassExtensionCLSID pCUID, Nothing
 
   ' release the exclusive lock
   pSchLock.ChangeSchemaLock (esriSharedSchemaLock)
 

[C#]
    //ISchemaLock Example


    public void ISchemaLock_Example(IObjectClass objectClass)
    {
        //This functions shows how you can use the ISchemLock interface to aquire 
        //an exclusive lock on an object class, before modifying its extension 
        //class COM component.
        //cast for the IClassSchemaEdit
        IClassSchemaEdit classSchemaEdit = (IClassSchemaEdit)objectClass;


        //set and exclusive lock on the class
        ISchemaLock schemaLock = (ISchemaLock)objectClass;
        schemaLock.ChangeSchemaLock(esriSchemaLock.esriExclusiveSchemaLock);


        //creat the IUID object
        ESRI.ArcGIS.esriSystem.UID classUID = new ESRI.ArcGIS.esriSystem.UIDClass();
        classUID.Value = "{484F435C-9A08-11D3-815A-0080C78E8371";
        
        //alter the class extension for the class
        classSchemaEdit.AlterClassExtensionCLSID(classUID, null);


        //release the exclusive lock
        schemaLock.ChangeSchemaLock(esriSchemaLock.esriSharedSchemaLock);
    }

[Visual Basic .NET, C++]
No example is available for Visual Basic .NET or C++. To view a Visual Basic 6.0 or C# example, click the Language Filter button Language Filter in the upper-left corner of the page.