private TDataObj _GetDataObject(EntityObject entity)
{
TDataObj obj = null;
if (_owner.IsStored)
{
// Try to find data object through IWrapDataAccess.
obj = DataObjectHelper.GetDataObject(entity) as TDataObj;
if (obj == null)
{
DataObjectContext ctx = ContextHelper.GetObjectContext(
_entityRef);
obj = DataObjectHelper.GetOrCreateDataObject <TDataObj>(ctx,
entity);
}
}
else
{
obj = DataObjectHelper.GetDataObject(entity) as TDataObj;
if (obj == null)
{
throw new DataException(Properties.Messages.Error_InvalidDataObjectInstance);
}
}
return(obj);
}
/// <summary>
/// Gets or creates data object depending on whether entity object
/// contains associated data object.
/// </summary>
/// <param name="context">DataObjectContext object.</param>
/// <param name="entity">Entity object.</param>
/// <returns>Generic data object.</returns>
public static T GetOrCreateDataObject <T>(DataObjectContext context,
EntityObject entity)
where T : DataObject
{
Debug.Assert(entity != null);
// get associated data object
IWrapDataAccess dataAccess = entity as IWrapDataAccess;
if (dataAccess == null)
{
throw new DataException(Properties.Messages.Error_GetWrapDataObjectFailed);
}
T obj = GetDataObject(entity) as T;
if (obj == null)
{
// associated object does not exist, create it
obj = context.CreateObject <T>(entity);
// associate object with entity
dataAccess.DataObject = obj;
}
return(obj);
}
/// <summary>
/// Creates a new instance of DataObjectCollection class.
/// </summary>
public DataObjectCollection(DataObjectContext context,
string entitySetName,
SpecFields specFields, bool isReadOnly)
{
_dataService = new DataService <TDataObject>(context, entitySetName,
specFields);
_isReadOnly = isReadOnly;
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
internal DataObjectManager(DataObjectContext context, string entityName, SpecFields specFields)
{
_context = context;
_dataService = new DataService <T>(context, entityName, specFields);
_dataService.ContextCollectionChanged += new CollectionChangeEventHandler(
_dataService_ContextCollectionChanged);
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
internal ScheduleManager(DataObjectContext context, string entitySetName,
SpecFields specFields,
DataService <Route> routeDS)
: base(context, entitySetName, specFields)
{
Debug.Assert(routeDS != null);
_routeDS = routeDS;
}
public DataService(DataObjectContext context, string entitySetName,
SpecFields specFields)
: base(context, entitySetName)
{
Debug.Assert(specFields != null);
_specFields = specFields;
context.ObjectStateManager.ObjectStateManagerChanged += new CollectionChangeEventHandler(
ObjectStateManager_Changed);
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Initializes a new instance of DataService class.
/// </summary>
protected BaseDataService(DataObjectContext context, string entitySetName)
{
Debug.Assert(context != null);
Debug.Assert(entitySetName != null);
_fullEntitySet = ContextHelper.GetFullEntitySetName(context,
entitySetName);
_context = context;
_entitySet = entitySetName;
}
private void _RemoveObject(DataObject obj)
{
DataObjectContext ctx = null;
if (GetObjectContext(out ctx))
{
ContextHelper.RemoveObject(ctx, obj);
}
else
{
obj.CanSave = false;
}
}
protected bool GetObjectContext(out DataObjectContext context)
{
context = null;
bool res = false;
if (_owner.IsStored)
{
context = ContextHelper.GetObjectContext(_entities);
res = true;
}
return(res);
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
/// <summary>
/// Opens SQL Server CE database using specified file path.
/// Upgrades database if scheme version less than the current one.
/// </summary>
/// <param name="path">
/// Database file path.
/// </param>
/// <returns>
/// DataObjectContext object.
/// </returns>
public static DataObjectContext OpenDatabase(string path)
{
Debug.Assert(path != null);
try
{
string sqlConnStr = DatabaseHelper.BuildSqlConnString(path, true);
// upgrade database if necessary
CheckForDbUpgrade(sqlConnStr);
// create object context
DataObjectContext ctx = new DataObjectContext(
_BuildEntityConnStr(sqlConnStr));
// keep connection alive to ensure exclusive mode
ctx.Connection.Open();
return(ctx);
}
catch (Exception e)
{
Logger.Error(e);
SqlCeException ceEx = _GetCEException(e);
if (ceEx != null &&
ceEx.NativeError == SSCE_M_FILESHAREVIOLATION)
{
throw new DataException(Properties.Messages.Error_DbFileSharingViolation,
DataError.FileSharingViolation);
}
else
{
throw;
}
}
}
/// <summary>
/// Creates a new instance of DataObjectOwnerCollection class.
/// </summary>
public DataObjectOwnerCollection(DataObjectContext context,
string entitySetName,
SpecFields specFields, bool isReadOnly) : base(context, entitySetName, specFields, isReadOnly)
{
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
internal OrderManager(DataObjectContext context, string entityName, SpecFields specFields)
: base(context, entityName, specFields)
{
}
/// <summary>
/// Initializes a new instance of the DeletionCheckingService class.
/// </summary>
/// <param name="dataContext">The reference to the data context to be used for accessing
/// project data.</param>
internal DeletionCheckingService(DataObjectContext dataContext)
{
Debug.Assert(dataContext != null);
_dataContext = dataContext;
}
///////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////////////////
public DataService(DataObjectContext context, string entitySetName)
: base(context, entitySetName)
{
context.ObjectStateManager.ObjectStateManagerChanged += new CollectionChangeEventHandler(
ObjectStateManager_Changed);
}
