ABAP Select data from SAP table AQHDSG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AQHDSG
*  INTO TABLE @DATA(IT_AQHDSG2).
*--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_AQHDSG INDEX 1 INTO DATA(WA_AQHDSG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AQHDSG>-CLAS = 1.
<AQHDSG>-ART = 1.
<AQHDSG>-LOGDB = 1.
<AQHDSG>-TSTRUC = 1.
<AQHDSG>-RP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AQHDSG-TINDX, sy-vline,
  WA_AQHDSG-SECU, sy-vline,
  WA_AQHDSG-FIXPOINT, sy-vline,
  WA_AQHDSG-SELSCREEN, sy-vline,
  WA_AQHDSG-SSETSG, sy-vline,
  WA_AQHDSG-DSNNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AQHDSG 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_AQHDSG 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_AQHDSG INTO WA_AQHDSG.


*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_AQHDSG_STR, 
CLAS TYPE STRING,
ART TYPE STRING,
LOGDB TYPE STRING,
TSTRUC TYPE STRING,
RP TYPE STRING,
TINDX TYPE STRING,
SECU TYPE STRING,
FIXPOINT TYPE STRING,
SELSCREEN TYPE STRING,
SSETSG TYPE STRING,
DSNNAME TYPE STRING,
DSNMODE TYPE STRING,
PROGRAM TYPE STRING,
STATE TYPE STRING,
GENERATED TYPE STRING,
OPTGEN TYPE STRING,
SGCNAM TYPE STRING,
SGCDAT TYPE STRING,
SGUNAM TYPE STRING,
SGUDAT TYPE STRING,
SGUTIM TYPE STRING,
MAXTIME TYPE STRING,
MAXDBACC TYPE STRING,
QREL TYPE STRING,
DEVC TYPE STRING,
OBJSEL TYPE STRING,
OBJSTRUC TYPE STRING,
WITH_TEXTS TYPE STRING,
DATA_PROG TYPE STRING,
API TYPE STRING,
CONTROL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AQHDSG_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_AQHDSG_STR-CLAS sy-vline 
WA_AQHDSG_STR-ART sy-vline 
WA_AQHDSG_STR-LOGDB sy-vline 
WA_AQHDSG_STR-TSTRUC sy-vline 
WA_AQHDSG_STR-RP sy-vline 
WA_AQHDSG_STR-TINDX sy-vline 
WA_AQHDSG_STR-SECU sy-vline 
WA_AQHDSG_STR-FIXPOINT sy-vline 
WA_AQHDSG_STR-SELSCREEN sy-vline 
WA_AQHDSG_STR-SSETSG sy-vline 
WA_AQHDSG_STR-DSNNAME sy-vline 
WA_AQHDSG_STR-DSNMODE sy-vline 
WA_AQHDSG_STR-PROGRAM sy-vline 
WA_AQHDSG_STR-STATE sy-vline 
WA_AQHDSG_STR-GENERATED sy-vline 
WA_AQHDSG_STR-OPTGEN sy-vline 
WA_AQHDSG_STR-SGCNAM sy-vline 
WA_AQHDSG_STR-SGCDAT sy-vline 
WA_AQHDSG_STR-SGUNAM sy-vline 
WA_AQHDSG_STR-SGUDAT sy-vline 
WA_AQHDSG_STR-SGUTIM sy-vline 
WA_AQHDSG_STR-MAXTIME sy-vline 
WA_AQHDSG_STR-MAXDBACC sy-vline 
WA_AQHDSG_STR-QREL sy-vline 
WA_AQHDSG_STR-DEVC sy-vline 
WA_AQHDSG_STR-OBJSEL sy-vline 
WA_AQHDSG_STR-OBJSTRUC sy-vline 
WA_AQHDSG_STR-WITH_TEXTS sy-vline 
WA_AQHDSG_STR-DATA_PROG sy-vline 
WA_AQHDSG_STR-API sy-vline 
WA_AQHDSG_STR-CONTROL sy-vline      INTO ld_text SEPARATED BY SPACE.

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