ABAP Select data from SAP table RES_TAB into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RES_TAB
*  INTO TABLE @DATA(IT_RES_TAB2).
*--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_RES_TAB INDEX 1 INTO DATA(WA_RES_TAB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RES_TAB>-PLVAR = 1.
<RES_TAB>-RESTY = 1.
<RES_TAB>-RESID = 1.
<RES_TAB>-CONT = 1.
<RES_TAB>-OTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RES_TAB-OBJID, sy-vline,
  WA_RES_TAB-SHORT, sy-vline,
  WA_RES_TAB-STEXT, sy-vline,
  WA_RES_TAB-KAPZ1, sy-vline,
  WA_RES_TAB-KAPZ2, sy-vline,
  WA_RES_TAB-KAPZ3, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RES_TAB 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_RES_TAB 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_RES_TAB INTO WA_RES_TAB.


*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_RES_TAB_STR, 
PLVAR TYPE STRING,
RESTY TYPE STRING,
RESID TYPE STRING,
CONT TYPE STRING,
OTYPE TYPE STRING,
OBJID TYPE STRING,
SHORT TYPE STRING,
STEXT TYPE STRING,
KAPZ1 TYPE STRING,
KAPZ2 TYPE STRING,
KAPZ3 TYPE STRING,
SELKZ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RES_TAB_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_RES_TAB_STR-PLVAR sy-vline 
WA_RES_TAB_STR-RESTY sy-vline 
WA_RES_TAB_STR-RESID sy-vline 
WA_RES_TAB_STR-CONT sy-vline 
WA_RES_TAB_STR-OTYPE sy-vline 
WA_RES_TAB_STR-OBJID sy-vline 
WA_RES_TAB_STR-SHORT sy-vline 
WA_RES_TAB_STR-STEXT sy-vline 
WA_RES_TAB_STR-KAPZ1 sy-vline 
WA_RES_TAB_STR-KAPZ2 sy-vline 
WA_RES_TAB_STR-KAPZ3 sy-vline 
WA_RES_TAB_STR-SELKZ sy-vline      INTO ld_text SEPARATED BY SPACE.

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