ABAP Select data from SAP table RELS_ER_MASTERDATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RELS_ER_MASTERDATA
*  INTO TABLE @DATA(IT_RELS_ER_MASTERDATA2).
*--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_RELS_ER_MASTERDATA INDEX 1 INTO DATA(WA_RELS_ER_MASTERDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RELS_ER_MASTERDATA>-INTRENO = 1.
<RELS_ER_MASTERDATA>-COUNTRY = 1.
<RELS_ER_MASTERDATA>-STATE = 1.
<RELS_ER_MASTERDATA>-DISTRICT = 1.
<RELS_ER_MASTERDATA>-MUNICIPAL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RELS_ER_MASTERDATA-SUBDISTRICT, sy-vline,
  WA_RELS_ER_MASTERDATA-ERPAGENO, sy-vline,
  WA_RELS_ER_MASTERDATA-AUTHGRP, sy-vline,
  WA_RELS_ER_MASTERDATA-RERF, sy-vline,
  WA_RELS_ER_MASTERDATA-DERF, sy-vline,
  WA_RELS_ER_MASTERDATA-TERF, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RELS_ER_MASTERDATA 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_RELS_ER_MASTERDATA 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_RELS_ER_MASTERDATA INTO WA_RELS_ER_MASTERDATA.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_RELS_ER_MASTERDATA_STR, 
INTRENO TYPE STRING,
COUNTRY TYPE STRING,
STATE TYPE STRING,
DISTRICT TYPE STRING,
MUNICIPAL TYPE STRING,
SUBDISTRICT TYPE STRING,
ERPAGENO TYPE STRING,
AUTHGRP TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RELS_ER_MASTERDATA_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_RELS_ER_MASTERDATA_STR-INTRENO sy-vline 
WA_RELS_ER_MASTERDATA_STR-COUNTRY sy-vline 
WA_RELS_ER_MASTERDATA_STR-STATE sy-vline 
WA_RELS_ER_MASTERDATA_STR-DISTRICT sy-vline 
WA_RELS_ER_MASTERDATA_STR-MUNICIPAL sy-vline 
WA_RELS_ER_MASTERDATA_STR-SUBDISTRICT sy-vline 
WA_RELS_ER_MASTERDATA_STR-ERPAGENO sy-vline 
WA_RELS_ER_MASTERDATA_STR-AUTHGRP sy-vline 
WA_RELS_ER_MASTERDATA_STR-RERF sy-vline 
WA_RELS_ER_MASTERDATA_STR-DERF sy-vline 
WA_RELS_ER_MASTERDATA_STR-TERF sy-vline 
WA_RELS_ER_MASTERDATA_STR-REHER sy-vline 
WA_RELS_ER_MASTERDATA_STR-RBEAR sy-vline 
WA_RELS_ER_MASTERDATA_STR-DBEAR sy-vline 
WA_RELS_ER_MASTERDATA_STR-TBEAR sy-vline 
WA_RELS_ER_MASTERDATA_STR-RBHER sy-vline      INTO ld_text SEPARATED BY SPACE.

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