Documentum 基础培训 05 Objects and Types.ppt

1、Module 5,Objects and Types,2,Objects and Types,Object-Relational Model,The Content Server manages content using object-relational technology,Object Technology,Relational Model,Object-RelationalModel,object,Properties of an object are stored in database tables,Content Server stores everything in a Do

2、cbase as an object,3,Objects and Types,What is an Object?,Documents, cabinets, folders, users and everything in the Docbase is an object An object is defined by its properties and methods Properties describe an object Methods describe work performed on an object,Who created me? When was I created?Wh

3、at version am I? When was I last updated?,object,properties,methods,Create Check in Checkout Delete,4,Objects and Types,Consider this instance of the dm_document object.,There are two categories of properties Single-valued properties Repeating-valued properties,dm_document Object Properties,Property

4、 values are assigned by Content Server User,Repeating-valued property,Single-valued property,Server-assigned value,User-assigned values,5,Objects and Types,Object Types,A type is a pre-defined template that is described by its properties and methods An object is a single instance of a particular typ

5、e. Types are organized into a hierarchy All objects belong to a particular type Subtypes inherit all of the properties of the supertype,6,Objects and Types,Documentum Object Types,You can also create custom types (user-defined types).,Here is a sample hierarchy of system-defined object types.,dm_sys

6、object,dm_user,dm_acl,dmr_content,dm_store,dm_format,Persistent Object,r_object_id i_vstamp i_is_replica,dm_note,dm_registered,dm_document,dm_procedure,dm_folder,dm_cabinet,.,.,.,.,dm_workflow,7,Objects and Types,Inheritance,A subtype inherits all properties of its supertype. In this example dm_docu

7、ment is a subtype of dm_sysobject dm_sysobject is a subtype of persistent object dm_document inherits all of the properties of dm_sysobject and persistent object,8,Objects and Types,TAG = type of object: 09dm_document 11dm_user 08dm_sysobject, dm_script, dm_query 12dm_group 06dmr_content 18dm_router

8、 05dmr_containment 19dm_registered 41dm_note 27dm_format 0cdm_cabinet 0ddm_assembly 0bdm_folder 3adm_location,Docbase id,unique id generated by server,TAG,Object ID,Is the unique ID assigned by Content Server to each object Is represented by the r_object_id property Describes the object type and the

9、 Docbase in which it resides,9,Objects and Types,Type Storage,Content Server stores properties of each object type in two tables name_of_type_s table stores an objects single-valued properties name_of_type_r table stores an objects repeating-valued properties,10,Objects and Types,Table: dm_sysobject_s ( _s for single-valued properties),Table: dm_sysobject_r ( _r for repeating-valued properties),This dm_document object is stored in the database tables as shown above,dm_document,Type Storage: Example,11,Objects and Types,View,Repres