ABAP 740的新语法 - 使用BO association的方式进行内表连接操作

ABAP Mesh is also a new feature in 740. Let’s use an example to demonstrate how it works: I have defined two types for developers and managers. developer type has a field manager which points to his manager, while manager type does not have any reference to his managing employee.

types: begin of t_manager,
         name     type char10,
         salary   type int4,
       end of t_manager,
       tt_manager type sorted table of t_manager with unique key name.
types: begin of t_developer,
         name     type char10,
         salary   type int4,
         manager TYPE char10,
       end of t_developer,
       tt_developer type sorted table of t_developer with unique key name.

I also use the new grammar – inline data declaration to fill developer and manager table. So far nothing special.

DATA: lt_developer TYPE tt_developer,
         lt_manager TYPE tt_manager.

   DATA(Jerry) = VALUE t_developer( name = 'Jerry' salary = 1000 manager = 'Jason' ).

   DATA(Tom) = VALUE t_developer( name = 'Tom' salary = 2000 manager = 'Jason' ).

   DATA(Bob) = VALUE t_developer( name = 'Bob' salary = 2100 manager = 'Jason' ).

   DATA(Jack) = VALUE t_developer( name = 'Jack' salary = 1000 manager = 'Thomas' ).

   DATA(David) = VALUE t_developer( name = 'David' salary = 2000 manager = 'Thomas' ).

   DATA(John) = VALUE t_developer( name = 'John' salary = 2100 manager = 'Thomas' ).

   DATA(Jason) = VALUE t_manager( name = 'Jason' salary = 3000 ).

   DATA(Thomas) = VALUE t_manager( name = 'Thomas' salary = 3200 ).

   INSERT Jerry INTO TABLE lt_developer.

   INSERT Tom INTO TABLE lt_developer.

   INSERT Bob INTO TABLE lt_developer.

   INSERT Jack INTO TABLE lt_developer.

   INSERT David INTO TABLE lt_developer.

   INSERT John INTO TABLE lt_developer.

   INSERT Jason INTO TABLE lt_manager.

   INSERT Thomas INTO TABLE lt_manager.

Now I define one ABAP mesh t_team with two component managers and developers. With association ‘my_employee’, I connect the internal table managers to developers, so that I could easily find all developers of a given manager. The association ‘my_manager’ just enables the connection in opposite direction: find out the manager of a given developer.

You can compare how I find Jerry’s manager and find all developers whose manager are Thomas using new ABAP mesh and the traditional way.

The result are exactly the same.

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