ABAP Select data from SAP table AT13U into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AT13U 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 AT13U. 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 AT13U 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_AT13U TYPE STANDARD TABLE OF AT13U,
      WA_AT13U TYPE AT13U,
      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: <AT13U> TYPE AT13U.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_AT13U.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM AT13U
  INTO TABLE IT_AT13U.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AT13U
*  INTO TABLE @DATA(IT_AT13U2).
*--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_AT13U INDEX 1 INTO DATA(WA_AT13U2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_AT13U ASSIGNING <AT13U>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AT13U>-MANDT = 1.
<AT13U>-SGSART = 1.
<AT13U>-SFHAART = 1.
<AT13U>-SFGZUSTTN = 1.
<AT13U>-SETTLFL = 1.

ENDLOOP.

LOOP AT IT_AT13U INTO WA_AT13U.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AT13U-SFHAZBA, sy-vline,
  WA_AT13U-SSIGN, sy-vline,
  WA_AT13U-RANTYP, sy-vline,
  WA_AT13U-SGSARTUL, sy-vline,
  WA_AT13U-SFHAARTUL, sy-vline,
  WA_AT13U-SFHAZBAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AT13U 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_AT13U 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_AT13U INTO WA_AT13U.


*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_AT13U_STR, 
MANDT TYPE STRING,
SGSART TYPE STRING,
SFHAART TYPE STRING,
SFGZUSTTN TYPE STRING,
SETTLFL TYPE STRING,
SFHAZBA TYPE STRING,
SSIGN TYPE STRING,
RANTYP TYPE STRING,
SGSARTUL TYPE STRING,
SFHAARTUL TYPE STRING,
SFHAZBAG TYPE STRING,
RANTYPUL TYPE STRING,
SFHAZBAUL TYPE STRING,
RKONDGRUL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AT13U_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_AT13U_STR-MANDT sy-vline 
WA_AT13U_STR-SGSART sy-vline 
WA_AT13U_STR-SFHAART sy-vline 
WA_AT13U_STR-SFGZUSTTN sy-vline 
WA_AT13U_STR-SETTLFL sy-vline 
WA_AT13U_STR-SFHAZBA sy-vline 
WA_AT13U_STR-SSIGN sy-vline 
WA_AT13U_STR-RANTYP sy-vline 
WA_AT13U_STR-SGSARTUL sy-vline 
WA_AT13U_STR-SFHAARTUL sy-vline 
WA_AT13U_STR-SFHAZBAG sy-vline 
WA_AT13U_STR-RANTYPUL sy-vline 
WA_AT13U_STR-SFHAZBAUL sy-vline 
WA_AT13U_STR-RKONDGRUL sy-vline      INTO ld_text SEPARATED BY SPACE.

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