ABAP Select data from SAP table U_16801 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP U_16801 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 U_16801. 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 U_16801 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_U_16801 TYPE STANDARD TABLE OF U_16801,
      WA_U_16801 TYPE U_16801,
      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: <U_16801> TYPE U_16801.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_U_16801.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM U_16801
  INTO TABLE IT_U_16801.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM U_16801
*  INTO TABLE @DATA(IT_U_168012).
*--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_U_16801 INDEX 1 INTO DATA(WA_U_168012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_U_16801 ASSIGNING <U_16801>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<U_16801>-MANDT = 1.
<U_16801>-ASORT = 1.
<U_16801>-SPRAS = 1.
<U_16801>-STATU = 1.
<U_16801>-KZLIK = 1.

ENDLOOP.

LOOP AT IT_U_16801 INTO WA_U_16801.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_U_16801-NLMATFB, sy-vline,
  WA_U_16801-VKORG, sy-vline,
  WA_U_16801-VTWEG, sy-vline,
  WA_U_16801-LSTFL, sy-vline,
  WA_U_16801-DATAB, sy-vline,
  WA_U_16801-DATBI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_U_16801 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_U_16801 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_U_16801 INTO WA_U_16801.


*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 ASORT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_U_16801-ASORT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_U_16801-ASORT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_U_16801-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_U_16801-SPRAS.
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_U_16801_STR, 
MANDT TYPE STRING,
ASORT TYPE STRING,
SPRAS TYPE STRING,
STATU TYPE STRING,
KZLIK TYPE STRING,
NLMATFB TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
LSTFL TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
KOPRO TYPE STRING,
LAYPR TYPE STRING,
SOTYP TYPE STRING,
LAYVR TYPE STRING,
POSDS TYPE STRING,
NAME1 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_U_16801_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_U_16801_STR-MANDT sy-vline 
WA_U_16801_STR-ASORT sy-vline 
WA_U_16801_STR-SPRAS sy-vline 
WA_U_16801_STR-STATU sy-vline 
WA_U_16801_STR-KZLIK sy-vline 
WA_U_16801_STR-NLMATFB sy-vline 
WA_U_16801_STR-VKORG sy-vline 
WA_U_16801_STR-VTWEG sy-vline 
WA_U_16801_STR-LSTFL sy-vline 
WA_U_16801_STR-DATAB sy-vline 
WA_U_16801_STR-DATBI sy-vline 
WA_U_16801_STR-KOPRO sy-vline 
WA_U_16801_STR-LAYPR sy-vline 
WA_U_16801_STR-SOTYP sy-vline 
WA_U_16801_STR-LAYVR sy-vline 
WA_U_16801_STR-POSDS sy-vline 
WA_U_16801_STR-NAME1 sy-vline      INTO ld_text SEPARATED BY SPACE.

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