ABAP Select data from SAP table TABLIST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TABLIST
*  INTO TABLE @DATA(IT_TABLIST2).
*--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_TABLIST INDEX 1 INTO DATA(WA_TABLIST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TABLIST>-OBJTYPE = 1.
<TABLIST>-SUBTYPE = 1.
<TABLIST>-TABNAME = 1.
<TABLIST>-BSKEY = 1.
<TABLIST>-BSKEY_LENG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TABLIST-SUPPOFFSET, sy-vline,
  WA_TABLIST-SUPPLENGTH, sy-vline,
  WA_TABLIST-SL_SPECIAL, sy-vline,
  WA_TABLIST-GETFUNC, sy-vline,
  WA_TABLIST-PUTFUNC, sy-vline,
  WA_TABLIST-DTABNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TABLIST 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_TABLIST 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_TABLIST INTO WA_TABLIST.


*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_TABLIST_STR, 
OBJTYPE TYPE STRING,
SUBTYPE TYPE STRING,
TABNAME TYPE STRING,
BSKEY TYPE STRING,
BSKEY_LENG TYPE STRING,
SUPPOFFSET TYPE STRING,
SUPPLENGTH TYPE STRING,
SL_SPECIAL TYPE STRING,
GETFUNC TYPE STRING,
PUTFUNC TYPE STRING,
DTABNAME TYPE STRING,
LFIELD TYPE STRING,
LKEYOFFSET TYPE STRING,
KEYLENGTH TYPE STRING,
TABLENGTH TYPE STRING,
MAXFLENGTH TYPE STRING,
EXITFUNC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TABLIST_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_TABLIST_STR-OBJTYPE sy-vline 
WA_TABLIST_STR-SUBTYPE sy-vline 
WA_TABLIST_STR-TABNAME sy-vline 
WA_TABLIST_STR-BSKEY sy-vline 
WA_TABLIST_STR-BSKEY_LENG sy-vline 
WA_TABLIST_STR-SUPPOFFSET sy-vline 
WA_TABLIST_STR-SUPPLENGTH sy-vline 
WA_TABLIST_STR-SL_SPECIAL sy-vline 
WA_TABLIST_STR-GETFUNC sy-vline 
WA_TABLIST_STR-PUTFUNC sy-vline 
WA_TABLIST_STR-DTABNAME sy-vline 
WA_TABLIST_STR-LFIELD sy-vline 
WA_TABLIST_STR-LKEYOFFSET sy-vline 
WA_TABLIST_STR-KEYLENGTH sy-vline 
WA_TABLIST_STR-TABLENGTH sy-vline 
WA_TABLIST_STR-MAXFLENGTH sy-vline 
WA_TABLIST_STR-EXITFUNC sy-vline      INTO ld_text SEPARATED BY SPACE.

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