Description and characteristics of generation and load status data objects

the statuses of the data objects

The statuses of the data objects can be:

  • ObjectStatus.UnAltered object data is not changed.
  • ObjectStatus.Created — a data object created.
  • ObjectStatus.Altered object data changed.
  • ObjectStatus.Deleted — data object deleted.

The object status can be ascertained by the method of the data object GetStatus and set — SetStatus. Status allows you to determine exactly what changes were made to the data object.

AutoAltered

Status Altered can be calculated automatically at the time you call GetStatus. This requires the class of the data object attribute to the attribute AutoAltered. If this attribute is not assigned, then set status Altered programmer must perform» «manually. You should carefully use this opportunity to remember that the installation AutoAltered slows down because each time the status of the real test object properties data on the change. Default AutoAltered=True;

There is a possibility not to be recalculated after the status of the established AutoAltered, it is necessary to call the method GetStatus(false).

To check if the attribute AutoAltered by using Information.AutoAlteredClass.

Test to modify the properties of a custom type

If the data object contains the properties of a custom type (e.g., type of Money), then the default value comparison of an attribute of the object itself and copy data will be made through the implementation of this attribute to a string by ToString() and then comparing strings. Not for all types the approach is correct and works fast, so there is a IComparableType interface that contains method for comparison. If a custom type inherited from the type the comparison is not to be through strings, and calling a special method contained in the interface. It is recommended to use this interface, all user attribute types.

download Status of the data object

The loading state of the data object:

  • LoadingState.NotLoaded object data is not loaded.
  • LoadingState.Loaded — proofread all native attributes of the data object, all the artisans of the first level, all dealove the first level.
  • LoadingState.LightLoaded object data is partially loaded, the details can be clarified by calling object methods GetLoadedProperties and CheckLoadedProperty.

The download status can be ascertained through the method GetLoadingState and set — SetLoadingState.

Features of relationship status and download status

Below are some features of the relationship between status and status of the download of data objects:

  • When a data object is created, it always NotLoaded Created (the same thing happens when you call the Clear method). If the object NotLoaded, it can only be Created.
  • If the object has a status Loaded/LightLoaded, it under no circumstances cannot have the status of Created.
  • Object does not happen NotLoaded UnAltered.
  • In a special way processed status and the download status of the object when it is refreshed.
  • If you need to move the object from state to state Created Altered, it is enough to call the method SetLoadingState(LoadingState.LightLoaded) thereby putting that object in the database is present. More correct way is to call SetExistObjectPrimaryKey(object primaryKey) is not only indicates that the object in the database is present, but immediately sets the right key of the object in the database.
  • Method to set the status of the data object DataObject.SetStatus() has special logic that is triggered when the switching status.
Set The \ Old UnAltered Created Altered Deleted
UnAltered UnAltered Created UnAltered if are not loaded are Created, UnAltered otherwise
Created Created ** Are Not Loaded Are** Created ** Are Not Loaded Are** Created ** Are Not Loaded Are** Created ** Are Not Loaded Are**
Altered Altered Created Altered Created if are not loaded are otherwise Altered
Deleted Deleted Deleted Deleted Deleted
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