ABAP Select data from SAP table H_RELMRCA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM H_RELMRCA
*  INTO TABLE @DATA(IT_H_RELMRCA2).
*--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_H_RELMRCA INDEX 1 INTO DATA(WA_H_RELMRCA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<H_RELMRCA>-MANDT = 1.
<H_RELMRCA>-INTRENO = 1.
<H_RELMRCA>-RCCATEGORY = 1.
<H_RELMRCA>-SURVEYOFFICE = 1.
<H_RELMRCA>-RCNO = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_H_RELMRCA-OBJNR, sy-vline,
  WA_H_RELMRCA-CREATIONTYPE, sy-vline,
  WA_H_RELMRCA-RESPONSIBLE, sy-vline,
  WA_H_RELMRCA-USEREXCLUSIVE, sy-vline,
  WA_H_RELMRCA-AUTHGRP, sy-vline,
  WA_H_RELMRCA-XRC, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_H_RELMRCA 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_H_RELMRCA 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_H_RELMRCA INTO WA_H_RELMRCA.


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

*Conversion exit REDAT, internal->external for field VALIDTO
CALL FUNCTION 'CONVERSION_EXIT_REDAT_OUTPUT'
  EXPORTING
    input =                      WA_H_RELMRCA-VALIDTO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_H_RELMRCA-VALIDTO.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEASUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_H_RELMRCA-MEASUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_H_RELMRCA-MEASUNIT.
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_H_RELMRCA_STR, 
MANDT TYPE STRING,
INTRENO TYPE STRING,
RCCATEGORY TYPE STRING,
SURVEYOFFICE TYPE STRING,
RCNO TYPE STRING,
OBJNR TYPE STRING,
CREATIONTYPE TYPE STRING,
RESPONSIBLE TYPE STRING,
USEREXCLUSIVE TYPE STRING,
AUTHGRP TYPE STRING,
XRC TYPE STRING,
VALIDFROM TYPE STRING,
VALIDTO TYPE STRING,
MEASCHANGE TYPE STRING,
MEASDIFF TYPE STRING,
MEASUNIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_H_RELMRCA_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_H_RELMRCA_STR-MANDT sy-vline 
WA_H_RELMRCA_STR-INTRENO sy-vline 
WA_H_RELMRCA_STR-RCCATEGORY sy-vline 
WA_H_RELMRCA_STR-SURVEYOFFICE sy-vline 
WA_H_RELMRCA_STR-RCNO sy-vline 
WA_H_RELMRCA_STR-OBJNR sy-vline 
WA_H_RELMRCA_STR-CREATIONTYPE sy-vline 
WA_H_RELMRCA_STR-RESPONSIBLE sy-vline 
WA_H_RELMRCA_STR-USEREXCLUSIVE sy-vline 
WA_H_RELMRCA_STR-AUTHGRP sy-vline 
WA_H_RELMRCA_STR-XRC sy-vline 
WA_H_RELMRCA_STR-VALIDFROM sy-vline 
WA_H_RELMRCA_STR-VALIDTO sy-vline 
WA_H_RELMRCA_STR-MEASCHANGE sy-vline 
WA_H_RELMRCA_STR-MEASDIFF sy-vline 
WA_H_RELMRCA_STR-MEASUNIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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