ABAP Select data from SAP table RGSMH into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RGSMH 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 RGSMH. 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 RGSMH 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_RGSMH TYPE STANDARD TABLE OF RGSMH,
      WA_RGSMH TYPE RGSMH,
      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: <RGSMH> TYPE RGSMH.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RGSMH
*  INTO TABLE @DATA(IT_RGSMH2).
*--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_RGSMH INDEX 1 INTO DATA(WA_RGSMH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RGSMH>-SEQNR = 1.
<RGSMH>-LINE = 1.
<RGSMH>-TABLE = 1.
<RGSMH>-CLASS = 1.
<RGSMH>-SETNR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RGSMH-LEVEL, sy-vline,
  WA_RGSMH-FIELD, sy-vline,
  WA_RGSMH-TYPE, sy-vline,
  WA_RGSMH-XDYNAMIC, sy-vline,
  WA_RGSMH-XSINGLEVAL, sy-vline,
  WA_RGSMH-FLAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RGSMH 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_RGSMH 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_RGSMH INTO WA_RGSMH.


*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_RGSMH_STR, 
SEQNR TYPE STRING,
LINE TYPE STRING,
TABLE TYPE STRING,
CLASS TYPE STRING,
SETNR TYPE STRING,
LEVEL TYPE STRING,
FIELD TYPE STRING,
TYPE TYPE STRING,
XDYNAMIC TYPE STRING,
XSINGLEVAL TYPE STRING,
FLAG TYPE STRING,
UNIQUE TYPE STRING,
ISUNIQUE TYPE STRING,
PUP TYPE STRING,
PDOWN TYPE STRING,
VCOUNT TYPE STRING,
MIN TYPE STRING,
MAX TYPE STRING,
TITLE TYPE STRING,
SNAME TYPE STRING,
LNAME TYPE STRING,
PRTCLASS TYPE STRING,
PMFLAG TYPE STRING,
RVALUE TYPE STRING,
AUTHGR TYPE STRING,
SEARCHFLD TYPE STRING,
SETCLASS TYPE STRING,
SHORTNAME TYPE STRING,
KOKRS TYPE STRING,
KTOPL TYPE STRING,
LIB TYPE STRING,
RNAME TYPE STRING,
ECCS_DIMEN TYPE STRING,
ECCS_ITCLG TYPE STRING,
ECCS_SITYP TYPE STRING,
FIKRS TYPE STRING,
SUBCLASS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RGSMH_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_RGSMH_STR-SEQNR sy-vline 
WA_RGSMH_STR-LINE sy-vline 
WA_RGSMH_STR-TABLE sy-vline 
WA_RGSMH_STR-CLASS sy-vline 
WA_RGSMH_STR-SETNR sy-vline 
WA_RGSMH_STR-LEVEL sy-vline 
WA_RGSMH_STR-FIELD sy-vline 
WA_RGSMH_STR-TYPE sy-vline 
WA_RGSMH_STR-XDYNAMIC sy-vline 
WA_RGSMH_STR-XSINGLEVAL sy-vline 
WA_RGSMH_STR-FLAG sy-vline 
WA_RGSMH_STR-UNIQUE sy-vline 
WA_RGSMH_STR-ISUNIQUE sy-vline 
WA_RGSMH_STR-PUP sy-vline 
WA_RGSMH_STR-PDOWN sy-vline 
WA_RGSMH_STR-VCOUNT sy-vline 
WA_RGSMH_STR-MIN sy-vline 
WA_RGSMH_STR-MAX sy-vline 
WA_RGSMH_STR-TITLE sy-vline 
WA_RGSMH_STR-SNAME sy-vline 
WA_RGSMH_STR-LNAME sy-vline 
WA_RGSMH_STR-PRTCLASS sy-vline 
WA_RGSMH_STR-PMFLAG sy-vline 
WA_RGSMH_STR-RVALUE sy-vline 
WA_RGSMH_STR-AUTHGR sy-vline 
WA_RGSMH_STR-SEARCHFLD sy-vline 
WA_RGSMH_STR-SETCLASS sy-vline 
WA_RGSMH_STR-SHORTNAME sy-vline 
WA_RGSMH_STR-KOKRS sy-vline 
WA_RGSMH_STR-KTOPL sy-vline 
WA_RGSMH_STR-LIB sy-vline 
WA_RGSMH_STR-RNAME sy-vline 
WA_RGSMH_STR-ECCS_DIMEN sy-vline 
WA_RGSMH_STR-ECCS_ITCLG sy-vline 
WA_RGSMH_STR-ECCS_SITYP sy-vline 
WA_RGSMH_STR-FIKRS sy-vline 
WA_RGSMH_STR-SUBCLASS sy-vline      INTO ld_text SEPARATED BY SPACE.

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