ABAP Select data from SAP table WRMA_CDT3_HIER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP WRMA_CDT3_HIER table and store it within an internal table, including using the newer @DATA inline declaration methods. It also shows you various ways to process this data using ABAP work area, inline declaration or field symbols including executing all the relevant CONVERSION_EXIT routines specific to WRMA_CDT3_HIER. See here for more generic Select statement tips.

Sometimes data within SAP is stored within the database table in a different format to what it is displayed to the user. These input/output conversation FM routines are what translates the data between the two formats.

There is also a full declaration of the WRMA_CDT3_HIER table where each field has a char/string type for you to simply copy and paste. This allows you to use processing that is only available to these field types such as the CONCATENATE statement.

DATA: IT_WRMA_CDT3_HIER TYPE STANDARD TABLE OF WRMA_CDT3_HIER,
      WA_WRMA_CDT3_HIER TYPE WRMA_CDT3_HIER,
      GD_STR TYPE STRING.

DATA: lo_typedescr type REF TO cl_abap_typedescr.
DATA: lv_fieldname type fieldname.

FIELD-SYMBOLS: <FIELD> TYPE any.
FIELD-SYMBOLS: <WRMA_CDT3_HIER> TYPE WRMA_CDT3_HIER.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_WRMA_CDT3_HIER.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM WRMA_CDT3_HIER
  INTO TABLE IT_WRMA_CDT3_HIER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM WRMA_CDT3_HIER
*  INTO TABLE @DATA(IT_WRMA_CDT3_HIER2).
*--Further methods of using ABAP code to  select data from SAP database tables

*You can also declare the header/work area using the in-line DATA declaration method
READ TABLE IT_WRMA_CDT3_HIER INDEX 1 INTO DATA(WA_WRMA_CDT3_HIER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_WRMA_CDT3_HIER ASSIGNING <WRMA_CDT3_HIER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<WRMA_CDT3_HIER>-NODEID = 1.
<WRMA_CDT3_HIER>-NODENAME = 1.
<WRMA_CDT3_HIER>-TLEVEL = 1.
<WRMA_CDT3_HIER>-PARENTID = 1.
<WRMA_CDT3_HIER>-CHILDID = 1.

ENDLOOP.

LOOP AT IT_WRMA_CDT3_HIER INTO WA_WRMA_CDT3_HIER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_WRMA_CDT3_HIER-NEXTID, sy-vline,
  WA_WRMA_CDT3_HIER-DATEFROM, sy-vline,
  WA_WRMA_CDT3_HIER-DATETO, sy-vline,
  WA_WRMA_CDT3_HIER-INTERVL, sy-vline,
  WA_WRMA_CDT3_HIER-FIELDNM, sy-vline,
  WA_WRMA_CDT3_HIER-CM_HIEID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_WRMA_CDT3_HIER you want to display...

  WRITE:/ sy-uline.
* Aternatively use generic code to Write field values (and NAME) to screen report
  DO.
    ASSIGN COMPONENT sy-index OF STRUCTURE wa_WRMA_CDT3_HIER TO <field>.
    IF sy-subrc <> 0. EXIT. ENDIF.
    WRITE:/ 'Field Value', <field>, sy-vline.
    gd_str = <field> .
    lo_typedescr ?= CL_ABAP_DATADESCR=>DESCRIBE_BY_DATA( <field> ).
    lv_fieldname = lo_typedescr->GET_RELATIVE_NAME( ).
    WRITE:/ 'Field Name', lv_fieldname.
  ENDDO.

  
*Redo loop but convert all fields from internal to out value  
LOOP AT IT_WRMA_CDT3_HIER INTO WA_WRMA_CDT3_HIER.


*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Convert all fields to display/output versions using conversion routines
  PERFORM convert_all_field_values CHANGING wa_EKKO.
	 
ENDLOOP.

  
*&---------------------------------------------------------------------*
*& Form convert_all_field_values
*&---------------------------------------------------------------------*
FORM convert_all_field_values CHANGING p_EKKO LIKE wa_EKKO.
DATA: ld_input(1000) TYPE c, ld_output(1000) TYPE C.

*Conversion exit ALPHA, internal->external for field NODENAME
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_WRMA_CDT3_HIER-NODENAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_WRMA_CDT3_HIER-NODENAME.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_WRMA_CDT3_HIER_STR, 
NODEID TYPE STRING,
NODENAME TYPE STRING,
TLEVEL TYPE STRING,
PARENTID TYPE STRING,
CHILDID TYPE STRING,
NEXTID TYPE STRING,
DATEFROM TYPE STRING,
DATETO TYPE STRING,
INTERVL TYPE STRING,
FIELDNM TYPE STRING,
CM_HIEID TYPE STRING,
CM_CDT3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_WRMA_CDT3_HIER_STR type T_EKKO_STR.

DATA: ld_text TYPE string.

LOOP AT IT_EKKO INTO WA_EKKO.
  MOVE-CORRESPONDING wa_EKKO TO WA_EKKO_STR.
  CONCATENATE: sy-vline
WA_WRMA_CDT3_HIER_STR-NODEID sy-vline 
WA_WRMA_CDT3_HIER_STR-NODENAME sy-vline 
WA_WRMA_CDT3_HIER_STR-TLEVEL sy-vline 
WA_WRMA_CDT3_HIER_STR-PARENTID sy-vline 
WA_WRMA_CDT3_HIER_STR-CHILDID sy-vline 
WA_WRMA_CDT3_HIER_STR-NEXTID sy-vline 
WA_WRMA_CDT3_HIER_STR-DATEFROM sy-vline 
WA_WRMA_CDT3_HIER_STR-DATETO sy-vline 
WA_WRMA_CDT3_HIER_STR-INTERVL sy-vline 
WA_WRMA_CDT3_HIER_STR-FIELDNM sy-vline 
WA_WRMA_CDT3_HIER_STR-CM_HIEID sy-vline 
WA_WRMA_CDT3_HIER_STR-CM_CDT3 sy-vline      INTO ld_text SEPARATED BY SPACE.

*Add any further fields from structure WA_EKKO_STR you want to CONCATENATE...
ENDLOOP.
ENDFORM.