ABAP Select data from SAP table ANLK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ANLK
*  INTO TABLE @DATA(IT_ANLK2).
*--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_ANLK INDEX 1 INTO DATA(WA_ANLK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ANLK>-MANDT = 1.
<ANLK>-BUKRS = 1.
<ANLK>-ANLN1 = 1.
<ANLK>-ANLN2 = 1.
<ANLK>-GJAHR = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ANLK-OBART, sy-vline,
  WA_ANLK-OBJID, sy-vline,
  WA_ANLK-KSTAR, sy-vline,
  WA_ANLK-USPOB, sy-vline,
  WA_ANLK-HRKFT, sy-vline,
  WA_ANLK-WAHKK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ANLK 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_ANLK 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_ANLK INTO WA_ANLK.


*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 ANLN1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ANLK-ANLN1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANLK-ANLN1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ANLN2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_ANLK-ANLN2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANLK-ANLN2.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit AC132, internal->external for field WAHKK
CALL FUNCTION 'CONVERSION_EXIT_AC132_OUTPUT'
  EXPORTING
    input =                      WA_ANLK-WAHKK
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_ANLK-WAHKK.
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_ANLK_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
ANLN1 TYPE STRING,
ANLN2 TYPE STRING,
GJAHR TYPE STRING,
OBART TYPE STRING,
OBJID TYPE STRING,
KSTAR TYPE STRING,
USPOB TYPE STRING,
HRKFT TYPE STRING,
WAHKK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ANLK_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_ANLK_STR-MANDT sy-vline 
WA_ANLK_STR-BUKRS sy-vline 
WA_ANLK_STR-ANLN1 sy-vline 
WA_ANLK_STR-ANLN2 sy-vline 
WA_ANLK_STR-GJAHR sy-vline 
WA_ANLK_STR-OBART sy-vline 
WA_ANLK_STR-OBJID sy-vline 
WA_ANLK_STR-KSTAR sy-vline 
WA_ANLK_STR-USPOB sy-vline 
WA_ANLK_STR-HRKFT sy-vline 
WA_ANLK_STR-WAHKK sy-vline      INTO ld_text SEPARATED BY SPACE.

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