ABAP Select data from SAP table AT19 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AT19 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 AT19. 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 AT19 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_AT19 TYPE STANDARD TABLE OF AT19,
      WA_AT19 TYPE AT19,
      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: <AT19> TYPE AT19.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_AT19.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM AT19
  INTO TABLE IT_AT19.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AT19
*  INTO TABLE @DATA(IT_AT192).
*--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_AT19 INDEX 1 INTO DATA(WA_AT192).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_AT19 ASSIGNING <AT19>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AT19>-MANDT = 1.
<AT19>-RANTYP = 1.
<AT19>-SBEWART = 1.
<AT19>-SBKKLAS = 1.
<AT19>-SBKTYP = 1.

ENDLOOP.

LOOP AT IT_AT19 INTO WA_AT19.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AT19-SBESTAND, sy-vline,
  WA_AT19-SERFOLG, sy-vline,
  WA_AT19-SBWRTNG, sy-vline,
  WA_AT19-SABGRZG, sy-vline,
  WA_AT19-SABGV, sy-vline,
  WA_AT19-SABGM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AT19 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_AT19 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_AT19 INTO WA_AT19.


*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.
ENDFORM. 

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

TYPES: BEGIN OF T_AT19_STR, 
MANDT TYPE STRING,
RANTYP TYPE STRING,
SBEWART TYPE STRING,
SBKKLAS TYPE STRING,
SBKTYP TYPE STRING,
SBESTAND TYPE STRING,
SERFOLG TYPE STRING,
SBWRTNG TYPE STRING,
SABGRZG TYPE STRING,
SABGV TYPE STRING,
SABGM TYPE STRING,
SBAABA TYPE STRING,
SBAABAR TYPE STRING,
SBAABT TYPE STRING,
SBAABTR TYPE STRING,
SBAABG TYPE STRING,
SSUMREL TYPE STRING,
SEARLYREP TYPE STRING,
SFEE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AT19_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_AT19_STR-MANDT sy-vline 
WA_AT19_STR-RANTYP sy-vline 
WA_AT19_STR-SBEWART sy-vline 
WA_AT19_STR-SBKKLAS sy-vline 
WA_AT19_STR-SBKTYP sy-vline 
WA_AT19_STR-SBESTAND sy-vline 
WA_AT19_STR-SERFOLG sy-vline 
WA_AT19_STR-SBWRTNG sy-vline 
WA_AT19_STR-SABGRZG sy-vline 
WA_AT19_STR-SABGV sy-vline 
WA_AT19_STR-SABGM sy-vline 
WA_AT19_STR-SBAABA sy-vline 
WA_AT19_STR-SBAABAR sy-vline 
WA_AT19_STR-SBAABT sy-vline 
WA_AT19_STR-SBAABTR sy-vline 
WA_AT19_STR-SBAABG sy-vline 
WA_AT19_STR-SSUMREL sy-vline 
WA_AT19_STR-SEARLYREP sy-vline 
WA_AT19_STR-SFEE sy-vline      INTO ld_text SEPARATED BY SPACE.

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