ABAP Select data from SAP table AD01FIELDS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP AD01FIELDS 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 AD01FIELDS. 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 AD01FIELDS 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_AD01FIELDS TYPE STANDARD TABLE OF AD01FIELDS,
      WA_AD01FIELDS TYPE AD01FIELDS,
      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: <AD01FIELDS> TYPE AD01FIELDS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_AD01FIELDS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM AD01FIELDS
  INTO TABLE IT_AD01FIELDS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM AD01FIELDS
*  INTO TABLE @DATA(IT_AD01FIELDS2).
*--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_AD01FIELDS INDEX 1 INTO DATA(WA_AD01FIELDS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_AD01FIELDS ASSIGNING <AD01FIELDS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<AD01FIELDS>-TABNAME = 1.
<AD01FIELDS>-FIELDNAME = 1.
<AD01FIELDS>-FPOSITION = 1.
<AD01FIELDS>-ROLLNAME = 1.
<AD01FIELDS>-DOMNAME = 1.

ENDLOOP.

LOOP AT IT_AD01FIELDS INTO WA_AD01FIELDS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_AD01FIELDS-INTTYPE, sy-vline,
  WA_AD01FIELDS-INTLEN, sy-vline,
  WA_AD01FIELDS-DATATYPE, sy-vline,
  WA_AD01FIELDS-OUTPUTLEN, sy-vline,
  WA_AD01FIELDS-DECIMALS, sy-vline,
  WA_AD01FIELDS-CONVEXIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_AD01FIELDS 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_AD01FIELDS 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_AD01FIELDS INTO WA_AD01FIELDS.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_AD01FIELDS-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_AD01FIELDS-DATATYPE.
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_AD01FIELDS_STR, 
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
FPOSITION TYPE STRING,
ROLLNAME TYPE STRING,
DOMNAME TYPE STRING,
INTTYPE TYPE STRING,
INTLEN TYPE STRING,
DATATYPE TYPE STRING,
OUTPUTLEN TYPE STRING,
DECIMALS TYPE STRING,
CONVEXIT TYPE STRING,
DDTEXT TYPE STRING,
OBL_FIELD TYPE STRING,
DER_FIELD TYPE STRING,
SEL_ATTR TYPE STRING,
CHAR_REL TYPE STRING,
FIL_ATTR TYPE STRING,
INV_ATTR TYPE STRING,
SDI_ATTR TYPE STRING,
FILTPRIO TYPE STRING,
FILTSETCL TYPE STRING,
FILTSETTAB TYPE STRING,
FILTSETNR TYPE STRING,
FILTSETID TYPE STRING,
DYNPSETTAB TYPE STRING,
EXPIN1 TYPE STRING,
EXPIN2 TYPE STRING,
EXPIN3 TYPE STRING,
SUM_FROM TYPE STRING,
SUM_TO TYPE STRING,
VVALUES TYPE STRING,
IDX_AD01DLIA TYPE STRING,
IDX_AD01ATTR TYPE STRING,
IDX_AD01ATTRI TYPE STRING,
IDX_SDSM_DLI TYPE STRING,END OF T_EKKO_STR.
DATA: WA_AD01FIELDS_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_AD01FIELDS_STR-TABNAME sy-vline 
WA_AD01FIELDS_STR-FIELDNAME sy-vline 
WA_AD01FIELDS_STR-FPOSITION sy-vline 
WA_AD01FIELDS_STR-ROLLNAME sy-vline 
WA_AD01FIELDS_STR-DOMNAME sy-vline 
WA_AD01FIELDS_STR-INTTYPE sy-vline 
WA_AD01FIELDS_STR-INTLEN sy-vline 
WA_AD01FIELDS_STR-DATATYPE sy-vline 
WA_AD01FIELDS_STR-OUTPUTLEN sy-vline 
WA_AD01FIELDS_STR-DECIMALS sy-vline 
WA_AD01FIELDS_STR-CONVEXIT sy-vline 
WA_AD01FIELDS_STR-DDTEXT sy-vline 
WA_AD01FIELDS_STR-OBL_FIELD sy-vline 
WA_AD01FIELDS_STR-DER_FIELD sy-vline 
WA_AD01FIELDS_STR-SEL_ATTR sy-vline 
WA_AD01FIELDS_STR-CHAR_REL sy-vline 
WA_AD01FIELDS_STR-FIL_ATTR sy-vline 
WA_AD01FIELDS_STR-INV_ATTR sy-vline 
WA_AD01FIELDS_STR-SDI_ATTR sy-vline 
WA_AD01FIELDS_STR-FILTPRIO sy-vline 
WA_AD01FIELDS_STR-FILTSETCL sy-vline 
WA_AD01FIELDS_STR-FILTSETTAB sy-vline 
WA_AD01FIELDS_STR-FILTSETNR sy-vline 
WA_AD01FIELDS_STR-FILTSETID sy-vline 
WA_AD01FIELDS_STR-DYNPSETTAB sy-vline 
WA_AD01FIELDS_STR-EXPIN1 sy-vline 
WA_AD01FIELDS_STR-EXPIN2 sy-vline 
WA_AD01FIELDS_STR-EXPIN3 sy-vline 
WA_AD01FIELDS_STR-SUM_FROM sy-vline 
WA_AD01FIELDS_STR-SUM_TO sy-vline 
WA_AD01FIELDS_STR-VVALUES sy-vline 
WA_AD01FIELDS_STR-IDX_AD01DLIA sy-vline 
WA_AD01FIELDS_STR-IDX_AD01ATTR sy-vline 
WA_AD01FIELDS_STR-IDX_AD01ATTRI sy-vline 
WA_AD01FIELDS_STR-IDX_SDSM_DLI sy-vline      INTO ld_text SEPARATED BY SPACE.

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