ABAP Select data from SAP table CNISFIELDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNISFIELDS
*  INTO TABLE @DATA(IT_CNISFIELDS2).
*--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_CNISFIELDS INDEX 1 INTO DATA(WA_CNISFIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNISFIELDS>-FLG_STRUC = 1.
<CNISFIELDS>-FLG_STMDAT = 1.
<CNISFIELDS>-FLG_CREATB = 1.
<CNISFIELDS>-FLG_DBDAT = 1.
<CNISFIELDS>-FLG_ARCDAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNISFIELDS-FLG_AKTDAT, sy-vline,
  WA_CNISFIELDS-FLG_VERDAT, sy-vline,
  WA_CNISFIELDS-FLG_AGGR, sy-vline,
  WA_CNISFIELDS-FLG_SHOW_PATH, sy-vline,
  WA_CNISFIELDS-FLG_SAVE, sy-vline,
  WA_CNISFIELDS-FLG_GET, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNISFIELDS 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_CNISFIELDS 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_CNISFIELDS INTO WA_CNISFIELDS.


*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_CNISFIELDS_STR, 
FLG_STRUC TYPE STRING,
FLG_STMDAT TYPE STRING,
FLG_CREATB TYPE STRING,
FLG_DBDAT TYPE STRING,
FLG_ARCDAT TYPE STRING,
FLG_AKTDAT TYPE STRING,
FLG_VERDAT TYPE STRING,
FLG_AGGR TYPE STRING,
FLG_SHOW_PATH TYPE STRING,
FLG_SAVE TYPE STRING,
FLG_GET TYPE STRING,
FLG_VSSEL1 TYPE STRING,
FLG_VSSEL2 TYPE STRING,
FLG_FILTER TYPE STRING,
FLG_HRVOR1 TYPE STRING,
FLG_HRVOR2 TYPE STRING,
FLG_PRINT TYPE STRING,
FLG_MAIL TYPE STRING,
FLG_EINST TYPE STRING,
FLG_AUTH TYPE STRING,
FLG_DATEN TYPE STRING,
FLG_SELVRS TYPE STRING,
FLG_RCKLOE TYPE STRING,
FLG_RCKVOR TYPE STRING,
FLG_RCKWFL TYPE STRING,
FLG_RCKDEZ TYPE STRING,
FLG_MS_ACC TYPE STRING,
FLG_PRJVSL TYPE STRING,
FLG_PRJVRS TYPE STRING,
FLG_NXTFRE TYPE STRING,
FLG_MASS TYPE STRING,
FROM_DATE TYPE STRING,
TO_DATE TYPE STRING,
FLG_AKTREP TYPE STRING,
UNAME TYPE STRING,
SORT_DOWN TYPE STRING,
SORT_UP TYPE STRING,
AGGREGATE TYPE STRING,
GROUPING TYPE STRING,
FLG_MIN_EH TYPE STRING,
FLG_MAX_EH TYPE STRING,
FLG_EXP_EH TYPE STRING,
FLG_AKTGRP TYPE STRING,
VSCMP_ADD TYPE STRING,
VSCMP_HIE TYPE STRING,
VSCMP_DIF TYPE STRING,
VSCMP_DB TYPE STRING,
VSCMP_ALL TYPE STRING,
VSCMP_ANZ TYPE STRING,
VSCMP_EXP TYPE STRING,
VSCMP_ADD1 TYPE STRING,
VSCMP_HIE1 TYPE STRING,
VSCMP_DIF1 TYPE STRING,
VSCMP_DB1 TYPE STRING,
VSCMP_ALL1 TYPE STRING,
VSCMP_ANZ1 TYPE STRING,
VSCMP_EXP1 TYPE STRING,
VSCMP_ADD2 TYPE STRING,
VSCMP_HIE2 TYPE STRING,
VSCMP_DIF2 TYPE STRING,
VSCMP_DB2 TYPE STRING,
VSCMP_ALL2 TYPE STRING,
VSCMP_ANZ2 TYPE STRING,
VSCMP_EXP2 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNISFIELDS_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_CNISFIELDS_STR-FLG_STRUC sy-vline 
WA_CNISFIELDS_STR-FLG_STMDAT sy-vline 
WA_CNISFIELDS_STR-FLG_CREATB sy-vline 
WA_CNISFIELDS_STR-FLG_DBDAT sy-vline 
WA_CNISFIELDS_STR-FLG_ARCDAT sy-vline 
WA_CNISFIELDS_STR-FLG_AKTDAT sy-vline 
WA_CNISFIELDS_STR-FLG_VERDAT sy-vline 
WA_CNISFIELDS_STR-FLG_AGGR sy-vline 
WA_CNISFIELDS_STR-FLG_SHOW_PATH sy-vline 
WA_CNISFIELDS_STR-FLG_SAVE sy-vline 
WA_CNISFIELDS_STR-FLG_GET sy-vline 
WA_CNISFIELDS_STR-FLG_VSSEL1 sy-vline 
WA_CNISFIELDS_STR-FLG_VSSEL2 sy-vline 
WA_CNISFIELDS_STR-FLG_FILTER sy-vline 
WA_CNISFIELDS_STR-FLG_HRVOR1 sy-vline 
WA_CNISFIELDS_STR-FLG_HRVOR2 sy-vline 
WA_CNISFIELDS_STR-FLG_PRINT sy-vline 
WA_CNISFIELDS_STR-FLG_MAIL sy-vline 
WA_CNISFIELDS_STR-FLG_EINST sy-vline 
WA_CNISFIELDS_STR-FLG_AUTH sy-vline 
WA_CNISFIELDS_STR-FLG_DATEN sy-vline 
WA_CNISFIELDS_STR-FLG_SELVRS sy-vline 
WA_CNISFIELDS_STR-FLG_RCKLOE sy-vline 
WA_CNISFIELDS_STR-FLG_RCKVOR sy-vline 
WA_CNISFIELDS_STR-FLG_RCKWFL sy-vline 
WA_CNISFIELDS_STR-FLG_RCKDEZ sy-vline 
WA_CNISFIELDS_STR-FLG_MS_ACC sy-vline 
WA_CNISFIELDS_STR-FLG_PRJVSL sy-vline 
WA_CNISFIELDS_STR-FLG_PRJVRS sy-vline 
WA_CNISFIELDS_STR-FLG_NXTFRE sy-vline 
WA_CNISFIELDS_STR-FLG_MASS sy-vline 
WA_CNISFIELDS_STR-FROM_DATE sy-vline 
WA_CNISFIELDS_STR-TO_DATE sy-vline 
WA_CNISFIELDS_STR-FLG_AKTREP sy-vline 
WA_CNISFIELDS_STR-UNAME sy-vline 
WA_CNISFIELDS_STR-SORT_DOWN sy-vline 
WA_CNISFIELDS_STR-SORT_UP sy-vline 
WA_CNISFIELDS_STR-AGGREGATE sy-vline 
WA_CNISFIELDS_STR-GROUPING sy-vline 
WA_CNISFIELDS_STR-FLG_MIN_EH sy-vline 
WA_CNISFIELDS_STR-FLG_MAX_EH sy-vline 
WA_CNISFIELDS_STR-FLG_EXP_EH sy-vline 
WA_CNISFIELDS_STR-FLG_AKTGRP sy-vline 
WA_CNISFIELDS_STR-VSCMP_ADD sy-vline 
WA_CNISFIELDS_STR-VSCMP_HIE sy-vline 
WA_CNISFIELDS_STR-VSCMP_DIF sy-vline 
WA_CNISFIELDS_STR-VSCMP_DB sy-vline 
WA_CNISFIELDS_STR-VSCMP_ALL sy-vline 
WA_CNISFIELDS_STR-VSCMP_ANZ sy-vline 
WA_CNISFIELDS_STR-VSCMP_EXP sy-vline 
WA_CNISFIELDS_STR-VSCMP_ADD1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_HIE1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_DIF1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_DB1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_ALL1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_ANZ1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_EXP1 sy-vline 
WA_CNISFIELDS_STR-VSCMP_ADD2 sy-vline 
WA_CNISFIELDS_STR-VSCMP_HIE2 sy-vline 
WA_CNISFIELDS_STR-VSCMP_DIF2 sy-vline 
WA_CNISFIELDS_STR-VSCMP_DB2 sy-vline 
WA_CNISFIELDS_STR-VSCMP_ALL2 sy-vline 
WA_CNISFIELDS_STR-VSCMP_ANZ2 sy-vline 
WA_CNISFIELDS_STR-VSCMP_EXP2 sy-vline      INTO ld_text SEPARATED BY SPACE.

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