ABAP Select data from SAP table TRCON_HD_CM into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TRCON_HD_CM 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 TRCON_HD_CM. 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 TRCON_HD_CM 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_TRCON_HD_CM TYPE STANDARD TABLE OF TRCON_HD_CM,
      WA_TRCON_HD_CM TYPE TRCON_HD_CM,
      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: <TRCON_HD_CM> TYPE TRCON_HD_CM.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRCON_HD_CM
*  INTO TABLE @DATA(IT_TRCON_HD_CM2).
*--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_TRCON_HD_CM INDEX 1 INTO DATA(WA_TRCON_HD_CM2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRCON_HD_CM>-TC_NUMB = 1.
<TRCON_HD_CM>-ABSSC = 1.
<TRCON_HD_CM>-LCNUM = 1.
<TRCON_HD_CM>-AKPRZ = 1.
<TRCON_HD_CM>-KKBER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRCON_HD_CM-KNKLI, sy-vline,
  WA_TRCON_HD_CM-GRUPP, sy-vline,
  WA_TRCON_HD_CM-SBGRP, sy-vline,
  WA_TRCON_HD_CM-CTLPC, sy-vline,
  WA_TRCON_HD_CM-CMWAE, sy-vline,
  WA_TRCON_HD_CM-CMFRE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRCON_HD_CM 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_TRCON_HD_CM 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_TRCON_HD_CM INTO WA_TRCON_HD_CM.


*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 TC_NUMB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TRCON_HD_CM-TC_NUMB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TRCON_HD_CM-TC_NUMB.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field KNKLI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TRCON_HD_CM-KNKLI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TRCON_HD_CM-KNKLI.
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_TRCON_HD_CM_STR, 
TC_NUMB TYPE STRING,
ABSSC TYPE STRING,
LCNUM TYPE STRING,
AKPRZ TYPE STRING,
KKBER TYPE STRING,
KNKLI TYPE STRING,
GRUPP TYPE STRING,
SBGRP TYPE STRING,
CTLPC TYPE STRING,
CMWAE TYPE STRING,
CMFRE TYPE STRING,
CMNUP TYPE STRING,
CMNGV TYPE STRING,
AMTBL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRCON_HD_CM_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_TRCON_HD_CM_STR-TC_NUMB sy-vline 
WA_TRCON_HD_CM_STR-ABSSC sy-vline 
WA_TRCON_HD_CM_STR-LCNUM sy-vline 
WA_TRCON_HD_CM_STR-AKPRZ sy-vline 
WA_TRCON_HD_CM_STR-KKBER sy-vline 
WA_TRCON_HD_CM_STR-KNKLI sy-vline 
WA_TRCON_HD_CM_STR-GRUPP sy-vline 
WA_TRCON_HD_CM_STR-SBGRP sy-vline 
WA_TRCON_HD_CM_STR-CTLPC sy-vline 
WA_TRCON_HD_CM_STR-CMWAE sy-vline 
WA_TRCON_HD_CM_STR-CMFRE sy-vline 
WA_TRCON_HD_CM_STR-CMNUP sy-vline 
WA_TRCON_HD_CM_STR-CMNGV sy-vline 
WA_TRCON_HD_CM_STR-AMTBL sy-vline      INTO ld_text SEPARATED BY SPACE.

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