ABAP Select data from SAP table RESC_ML_TAPE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RESC_ML_TAPE
*  INTO TABLE @DATA(IT_RESC_ML_TAPE2).
*--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_RESC_ML_TAPE INDEX 1 INTO DATA(WA_RESC_ML_TAPE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RESC_ML_TAPE>-REC_TYP = 1.
<RESC_ML_TAPE>-ABRKDNR = 1.
<RESC_ML_TAPE>-STECHEM = 1.
<RESC_ML_TAPE>-ABNNR = 1.
<RESC_ML_TAPE>-ABRWZT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RESC_ML_TAPE-ABRNAME2, sy-vline,
  WA_RESC_ML_TAPE-AAKONST, sy-vline,
  WA_RESC_ML_TAPE-ABRRES11, sy-vline,
  WA_RESC_ML_TAPE-ABRRES451, sy-vline,
  WA_RESC_ML_TAPE-REC_KZ1, sy-vline,
  WA_RESC_ML_TAPE-CR1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RESC_ML_TAPE 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_RESC_ML_TAPE 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_RESC_ML_TAPE INTO WA_RESC_ML_TAPE.


*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_RESC_ML_TAPE_STR, 
REC_TYP TYPE STRING,
ABRKDNR TYPE STRING,
STECHEM TYPE STRING,
ABNNR TYPE STRING,
ABRWZT TYPE STRING,
ABRNAME2 TYPE STRING,
AAKONST TYPE STRING,
ABRRES11 TYPE STRING,
ABRRES451 TYPE STRING,
REC_KZ1 TYPE STRING,
CR1 TYPE STRING,
LF1 TYPE STRING,
ABRNAME1 TYPE STRING,
ABKONST TYPE STRING,
ABRANSCHRO TYPE STRING,
ACKONST TYPE STRING,
ABRANSCHRS TYPE STRING,
ADKONST TYPE STRING,
ABRRES452 TYPE STRING,
REC_KZ2 TYPE STRING,
CR2 TYPE STRING,
LF2 TYPE STRING,
ABRGRDHZ TYPE STRING,
ABRGRDWW TYPE STRING,
ABRGRDSO TYPE STRING,
ABRVORHZD TYPE STRING,
ABRVORWWD TYPE STRING,
ABRVORSOD TYPE STRING,
ABRRES12 TYPE STRING,
ABRRES13 TYPE STRING,
ABRRES16 TYPE STRING,
ABRRES8_1 TYPE STRING,
ABRRES17 TYPE STRING,
ABRRES8_2 TYPE STRING,
ABRMWSTKZ TYPE STRING,
ABRMONRAT TYPE STRING,
ABRUMLWKZ TYPE STRING,
ABRAUSLBTR TYPE STRING,
ABRRES20 TYPE STRING,
REC_KZ3 TYPE STRING,
CRLF TYPE STRING,
RET TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RESC_ML_TAPE_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_RESC_ML_TAPE_STR-REC_TYP sy-vline 
WA_RESC_ML_TAPE_STR-ABRKDNR sy-vline 
WA_RESC_ML_TAPE_STR-STECHEM sy-vline 
WA_RESC_ML_TAPE_STR-ABNNR sy-vline 
WA_RESC_ML_TAPE_STR-ABRWZT sy-vline 
WA_RESC_ML_TAPE_STR-ABRNAME2 sy-vline 
WA_RESC_ML_TAPE_STR-AAKONST sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES11 sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES451 sy-vline 
WA_RESC_ML_TAPE_STR-REC_KZ1 sy-vline 
WA_RESC_ML_TAPE_STR-CR1 sy-vline 
WA_RESC_ML_TAPE_STR-LF1 sy-vline 
WA_RESC_ML_TAPE_STR-ABRNAME1 sy-vline 
WA_RESC_ML_TAPE_STR-ABKONST sy-vline 
WA_RESC_ML_TAPE_STR-ABRANSCHRO sy-vline 
WA_RESC_ML_TAPE_STR-ACKONST sy-vline 
WA_RESC_ML_TAPE_STR-ABRANSCHRS sy-vline 
WA_RESC_ML_TAPE_STR-ADKONST sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES452 sy-vline 
WA_RESC_ML_TAPE_STR-REC_KZ2 sy-vline 
WA_RESC_ML_TAPE_STR-CR2 sy-vline 
WA_RESC_ML_TAPE_STR-LF2 sy-vline 
WA_RESC_ML_TAPE_STR-ABRGRDHZ sy-vline 
WA_RESC_ML_TAPE_STR-ABRGRDWW sy-vline 
WA_RESC_ML_TAPE_STR-ABRGRDSO sy-vline 
WA_RESC_ML_TAPE_STR-ABRVORHZD sy-vline 
WA_RESC_ML_TAPE_STR-ABRVORWWD sy-vline 
WA_RESC_ML_TAPE_STR-ABRVORSOD sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES12 sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES13 sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES16 sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES8_1 sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES17 sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES8_2 sy-vline 
WA_RESC_ML_TAPE_STR-ABRMWSTKZ sy-vline 
WA_RESC_ML_TAPE_STR-ABRMONRAT sy-vline 
WA_RESC_ML_TAPE_STR-ABRUMLWKZ sy-vline 
WA_RESC_ML_TAPE_STR-ABRAUSLBTR sy-vline 
WA_RESC_ML_TAPE_STR-ABRRES20 sy-vline 
WA_RESC_ML_TAPE_STR-REC_KZ3 sy-vline 
WA_RESC_ML_TAPE_STR-CRLF sy-vline 
WA_RESC_ML_TAPE_STR-RET sy-vline      INTO ld_text SEPARATED BY SPACE.

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