ABAP Select data from SAP table NACH_LONG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NACH_LONG
*  INTO TABLE @DATA(IT_NACH_LONG2).
*--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_NACH_LONG INDEX 1 INTO DATA(WA_NACH_LONG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NACH_LONG>-MANDT = 1.
<NACH_LONG>-KNUMH = 1.
<NACH_LONG>-ERNAM = 1.
<NACH_LONG>-ERDAT = 1.
<NACH_LONG>-KVEWE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NACH_LONG-KOTABNR, sy-vline,
  WA_NACH_LONG-KAPPL, sy-vline,
  WA_NACH_LONG-KSCHL, sy-vline,
  WA_NACH_LONG-VAKEY, sy-vline,
  WA_NACH_LONG-DATAB, sy-vline,
  WA_NACH_LONG-DATBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NACH_LONG 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_NACH_LONG 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_NACH_LONG INTO WA_NACH_LONG.


*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.

*Conversion exit KOTAB, internal->external for field KOTABNR
CALL FUNCTION 'CONVERSION_EXIT_KOTAB_OUTPUT'
  EXPORTING
    input =                      WA_NACH_LONG-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NACH_LONG-KOTABNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_NACH_LONG-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NACH_LONG-PARVW.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_NACH_LONG-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NACH_LONG-SPRAS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SPDEV, internal->external for field LDEST
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_NACH_LONG-LDEST
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NACH_LONG-LDEST.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_NACH_LONG_STR, 
MANDT TYPE STRING,
KNUMH TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
KVEWE TYPE STRING,
KOTABNR TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
VAKEY TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
KOSRT TYPE STRING,
PARVW TYPE STRING,
PARNR TYPE STRING,
NACHA TYPE STRING,
ANZAL TYPE STRING,
VSZTP TYPE STRING,
TCODE TYPE STRING,
AENDE TYPE STRING,
REPID TYPE STRING,
PFLD1 TYPE STRING,
PFLD2 TYPE STRING,
PFLD3 TYPE STRING,
PFLD4 TYPE STRING,
PFLD5 TYPE STRING,
PMID1 TYPE STRING,
PMID2 TYPE STRING,
PMID3 TYPE STRING,
PMID4 TYPE STRING,
PMID5 TYPE STRING,
TDNAME TYPE STRING,
TDID TYPE STRING,
SPRAS TYPE STRING,
SNDDR TYPE STRING,
SNDEX TYPE STRING,
SNDCP TYPE STRING,
SNDBC TYPE STRING,
FORFB TYPE STRING,
PRIFB TYPE STRING,
ACALL TYPE STRING,
OBJAC TYPE STRING,
OBJRR TYPE STRING,
OBJRN TYPE STRING,
OUTFL TYPE STRING,
OBJSNS TYPE STRING,
OBJPRI TYPE STRING,
OBJCP TYPE STRING,
LDEST TYPE STRING,
DSNAM TYPE STRING,
DSUF1 TYPE STRING,
DSUF2 TYPE STRING,
DIMME TYPE STRING,
DELET TYPE STRING,
TDRECEIVER TYPE STRING,
TDDIVISION TYPE STRING,
TDOCOVER TYPE STRING,
TDCOVTITLE TYPE STRING,
TDAUTORITY TYPE STRING,
ACOUT TYPE STRING,
SKIPS TYPE STRING,
ACMEM TYPE STRING,
ACNAM TYPE STRING,
EVENT TYPE STRING,
OBJTYPE TYPE STRING,
TDSCHEDULE TYPE STRING,
TDARMOD TYPE STRING,
UPDKZ TYPE STRING,
MAIL_P_LONG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NACH_LONG_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_NACH_LONG_STR-MANDT sy-vline 
WA_NACH_LONG_STR-KNUMH sy-vline 
WA_NACH_LONG_STR-ERNAM sy-vline 
WA_NACH_LONG_STR-ERDAT sy-vline 
WA_NACH_LONG_STR-KVEWE sy-vline 
WA_NACH_LONG_STR-KOTABNR sy-vline 
WA_NACH_LONG_STR-KAPPL sy-vline 
WA_NACH_LONG_STR-KSCHL sy-vline 
WA_NACH_LONG_STR-VAKEY sy-vline 
WA_NACH_LONG_STR-DATAB sy-vline 
WA_NACH_LONG_STR-DATBI sy-vline 
WA_NACH_LONG_STR-KOSRT sy-vline 
WA_NACH_LONG_STR-PARVW sy-vline 
WA_NACH_LONG_STR-PARNR sy-vline 
WA_NACH_LONG_STR-NACHA sy-vline 
WA_NACH_LONG_STR-ANZAL sy-vline 
WA_NACH_LONG_STR-VSZTP sy-vline 
WA_NACH_LONG_STR-TCODE sy-vline 
WA_NACH_LONG_STR-AENDE sy-vline 
WA_NACH_LONG_STR-REPID sy-vline 
WA_NACH_LONG_STR-PFLD1 sy-vline 
WA_NACH_LONG_STR-PFLD2 sy-vline 
WA_NACH_LONG_STR-PFLD3 sy-vline 
WA_NACH_LONG_STR-PFLD4 sy-vline 
WA_NACH_LONG_STR-PFLD5 sy-vline 
WA_NACH_LONG_STR-PMID1 sy-vline 
WA_NACH_LONG_STR-PMID2 sy-vline 
WA_NACH_LONG_STR-PMID3 sy-vline 
WA_NACH_LONG_STR-PMID4 sy-vline 
WA_NACH_LONG_STR-PMID5 sy-vline 
WA_NACH_LONG_STR-TDNAME sy-vline 
WA_NACH_LONG_STR-TDID sy-vline 
WA_NACH_LONG_STR-SPRAS sy-vline 
WA_NACH_LONG_STR-SNDDR sy-vline 
WA_NACH_LONG_STR-SNDEX sy-vline 
WA_NACH_LONG_STR-SNDCP sy-vline 
WA_NACH_LONG_STR-SNDBC sy-vline 
WA_NACH_LONG_STR-FORFB sy-vline 
WA_NACH_LONG_STR-PRIFB sy-vline 
WA_NACH_LONG_STR-ACALL sy-vline 
WA_NACH_LONG_STR-OBJAC sy-vline 
WA_NACH_LONG_STR-OBJRR sy-vline 
WA_NACH_LONG_STR-OBJRN sy-vline 
WA_NACH_LONG_STR-OUTFL sy-vline 
WA_NACH_LONG_STR-OBJSNS sy-vline 
WA_NACH_LONG_STR-OBJPRI sy-vline 
WA_NACH_LONG_STR-OBJCP sy-vline 
WA_NACH_LONG_STR-LDEST sy-vline 
WA_NACH_LONG_STR-DSNAM sy-vline 
WA_NACH_LONG_STR-DSUF1 sy-vline 
WA_NACH_LONG_STR-DSUF2 sy-vline 
WA_NACH_LONG_STR-DIMME sy-vline 
WA_NACH_LONG_STR-DELET sy-vline 
WA_NACH_LONG_STR-TDRECEIVER sy-vline 
WA_NACH_LONG_STR-TDDIVISION sy-vline 
WA_NACH_LONG_STR-TDOCOVER sy-vline 
WA_NACH_LONG_STR-TDCOVTITLE sy-vline 
WA_NACH_LONG_STR-TDAUTORITY sy-vline 
WA_NACH_LONG_STR-ACOUT sy-vline 
WA_NACH_LONG_STR-SKIPS sy-vline 
WA_NACH_LONG_STR-ACMEM sy-vline 
WA_NACH_LONG_STR-ACNAM sy-vline 
WA_NACH_LONG_STR-EVENT sy-vline 
WA_NACH_LONG_STR-OBJTYPE sy-vline 
WA_NACH_LONG_STR-TDSCHEDULE sy-vline 
WA_NACH_LONG_STR-TDARMOD sy-vline 
WA_NACH_LONG_STR-UPDKZ sy-vline 
WA_NACH_LONG_STR-MAIL_P_LONG sy-vline      INTO ld_text SEPARATED BY SPACE.

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