ABAP Select data from SAP table AT16B into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AT16B 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 AT16B. 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 AT16B 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_AT16B TYPE STANDARD TABLE OF AT16B,
      WA_AT16B TYPE AT16B,
      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: <AT16B> TYPE AT16B.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_AT16B.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM AT16B
  INTO TABLE IT_AT16B.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AT16B
*  INTO TABLE @DATA(IT_AT16B2).
*--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_AT16B INDEX 1 INTO DATA(WA_AT16B2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_AT16B ASSIGNING <AT16B>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AT16B>-MANDT = 1.
<AT16B>-BUKRS = 1.
<AT16B>-KONTRH = 1.
<AT16B>-SGSART = 1.
<AT16B>-SFHAART = 1.

ENDLOOP.

LOOP AT IT_AT16B INTO WA_AT16B.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AT16B-SPGBUKRS, sy-vline,
  WA_AT16B-SPGPARTNER, sy-vline,
  WA_AT16B-SPGSGSART, sy-vline,
  WA_AT16B-SPGSFHAART, sy-vline,
  WA_AT16B-SSFGZUSTT, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_AT16B 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_AT16B 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_AT16B INTO WA_AT16B.


*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 KONTRH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AT16B-KONTRH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AT16B-KONTRH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field SPGPARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_AT16B-SPGPARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AT16B-SPGPARTNER.
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_AT16B_STR, 
MANDT TYPE STRING,
BUKRS TYPE STRING,
KONTRH TYPE STRING,
SGSART TYPE STRING,
SFHAART TYPE STRING,
SPGBUKRS TYPE STRING,
SPGPARTNER TYPE STRING,
SPGSGSART TYPE STRING,
SPGSFHAART TYPE STRING,
SSFGZUSTT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AT16B_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_AT16B_STR-MANDT sy-vline 
WA_AT16B_STR-BUKRS sy-vline 
WA_AT16B_STR-KONTRH sy-vline 
WA_AT16B_STR-SGSART sy-vline 
WA_AT16B_STR-SFHAART sy-vline 
WA_AT16B_STR-SPGBUKRS sy-vline 
WA_AT16B_STR-SPGPARTNER sy-vline 
WA_AT16B_STR-SPGSGSART sy-vline 
WA_AT16B_STR-SPGSFHAART sy-vline 
WA_AT16B_STR-SSFGZUSTT sy-vline      INTO ld_text SEPARATED BY SPACE.

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