ABAP Select data from SAP table NACH_HELP into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP NACH_HELP 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_HELP. 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_HELP 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_HELP TYPE STANDARD TABLE OF NACH_HELP,
      WA_NACH_HELP TYPE NACH_HELP,
      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_HELP> TYPE NACH_HELP.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM NACH_HELP
*  INTO TABLE @DATA(IT_NACH_HELP2).
*--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_HELP INDEX 1 INTO DATA(WA_NACH_HELP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<NACH_HELP>-REPID = 1.
<NACH_HELP>-TCODE = 1.
<NACH_HELP>-PMID1 = 1.
<NACH_HELP>-PMID2 = 1.
<NACH_HELP>-PMID3 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_NACH_HELP-PMID4, sy-vline,
  WA_NACH_HELP-PMID5, sy-vline,
  WA_NACH_HELP-PFLD1, sy-vline,
  WA_NACH_HELP-PFLD2, sy-vline,
  WA_NACH_HELP-PFLD3, sy-vline,
  WA_NACH_HELP-PFLD4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_NACH_HELP 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_HELP 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_HELP INTO WA_NACH_HELP.


*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 ALPHA, internal->external for field PARNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_NACH_HELP-PARNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NACH_HELP-PARNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field PARVW
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_NACH_HELP-PARVW
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_NACH_HELP-PARVW.
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_HELP_STR, 
REPID TYPE STRING,
TCODE TYPE STRING,
PMID1 TYPE STRING,
PMID2 TYPE STRING,
PMID3 TYPE STRING,
PMID4 TYPE STRING,
PMID5 TYPE STRING,
PFLD1 TYPE STRING,
PFLD2 TYPE STRING,
PFLD3 TYPE STRING,
PFLD4 TYPE STRING,
PFLD5 TYPE STRING,
OBJFC TYPE STRING,
OBJCO TYPE STRING,
OBJPR TYPE STRING,
PARNR TYPE STRING,
OBJRR TYPE STRING,
SNDEX TYPE STRING,
SNDCP TYPE STRING,
SNDBC TYPE STRING,
FORFB TYPE STRING,
PRIFB TYPE STRING,
ACALL TYPE STRING,
ACONE TYPE STRING,
OBJCP TYPE STRING,
OBJAC TYPE STRING,
OUTFL TYPE STRING,
OBJSNS TYPE STRING,
PARVW TYPE STRING,END OF T_EKKO_STR.
DATA: WA_NACH_HELP_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_HELP_STR-REPID sy-vline 
WA_NACH_HELP_STR-TCODE sy-vline 
WA_NACH_HELP_STR-PMID1 sy-vline 
WA_NACH_HELP_STR-PMID2 sy-vline 
WA_NACH_HELP_STR-PMID3 sy-vline 
WA_NACH_HELP_STR-PMID4 sy-vline 
WA_NACH_HELP_STR-PMID5 sy-vline 
WA_NACH_HELP_STR-PFLD1 sy-vline 
WA_NACH_HELP_STR-PFLD2 sy-vline 
WA_NACH_HELP_STR-PFLD3 sy-vline 
WA_NACH_HELP_STR-PFLD4 sy-vline 
WA_NACH_HELP_STR-PFLD5 sy-vline 
WA_NACH_HELP_STR-OBJFC sy-vline 
WA_NACH_HELP_STR-OBJCO sy-vline 
WA_NACH_HELP_STR-OBJPR sy-vline 
WA_NACH_HELP_STR-PARNR sy-vline 
WA_NACH_HELP_STR-OBJRR sy-vline 
WA_NACH_HELP_STR-SNDEX sy-vline 
WA_NACH_HELP_STR-SNDCP sy-vline 
WA_NACH_HELP_STR-SNDBC sy-vline 
WA_NACH_HELP_STR-FORFB sy-vline 
WA_NACH_HELP_STR-PRIFB sy-vline 
WA_NACH_HELP_STR-ACALL sy-vline 
WA_NACH_HELP_STR-ACONE sy-vline 
WA_NACH_HELP_STR-OBJCP sy-vline 
WA_NACH_HELP_STR-OBJAC sy-vline 
WA_NACH_HELP_STR-OUTFL sy-vline 
WA_NACH_HELP_STR-OBJSNS sy-vline 
WA_NACH_HELP_STR-PARVW sy-vline      INTO ld_text SEPARATED BY SPACE.

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