Author: Anirban Bhattacharjee
Submitted: 16 Sept 2008
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Concept of Run Time Type Creation
Type object creation
Type object can be created referring to the corresponding description class in 3 steps.
Step 1:
Declaration of structure and table type referring to the corresponding description classes.
ref_rowtype TYPE REF TO cl_abap_structdescr ---> Structure declaration
ref_tabletype TYPE REF TO cl_abap_tabledescr ---> Internal Table declaration
Step 2:
Dynamic instantiation. First we create a line type dynamically referring to the given data table name by the syntax,
ref_rowtype ?= cl_abap_typedescr=>describe_by_name( p_tab ).
After creation of the row type the same is widening casted to ref_rowtype.
To create an internal table dynamically at runtime we use CREATE method of description class CL_ABAP_TABLEDESCR. CREATE method contains parameter P_LINE _TYPE to determine line type of the internal table with respect to ref_rowtype defined above. Finally the internal table instantiated to ref_tabletype.
ref_tabletype = cl_abap_tabledescr=>create( p_line_type = ref_rowtype ).
Step 3:
Creation of object.
The CREATE DATA allows us create object during run time and HANDLE addition is used as the reference is also created dynamically during runtime. CREATE DATA ref_itab TYPE HANDLE ref_tabletype.
CREATE DATA ref_wa TYPE HANDLE ref_rowtype.
Value Assignment.
The value of is assigned to the compatible field symbol by ASSIGN statement
ASSIGN ref_itab->* TO <fsym_itab>.
ASSIGN ref_wa->* TO <fsym_warea>.
Data Population into the dynamically created internal table.
SELECT *
FROM (p_tab)
INTO TABLE <fsym_itab>.
Display of data.
The data is displayed in two steps.
Initially we take data of each row of the internal table into work area one-by-one with the help of LOOP... ENDLOOP statement.
LOOP AT <fsym_itab> INTO <fsym_warea>.
Inside this LOOP.... ENDLOOP, we take one DO...ENDDO. loop where the field values of each of the work area take previously is assigned to the field symbol <fsym_field>.
ASSIGN COMPONENT sy-index OF STRUCTURE <fsym_warea> TO <fsym_field>.
After the value of the last field of each work area is assigned to <fsym_field>, if we again execute the ASSIGN COMPONENT , the sy-subrc value will become non-zero and we need to break the loop by EXIT statement.
IF sy-subrc NE 0.
NEW-LINE.
EXIT.
ENDIF.
In the selection screen , enter the name of any SAP Data table. Here I have taken SCARR.
On hit F8, we can get the contain of SCARR.
