ABAP Select data from SAP table TCACS_OAWLDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TCACS_OAWLDS
*  INTO TABLE @DATA(IT_TCACS_OAWLDS2).
*--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_TCACS_OAWLDS INDEX 1 INTO DATA(WA_TCACS_OAWLDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TCACS_OAWLDS>-MANDT = 1.
<TCACS_OAWLDS>-OAWLDID = 1.
<TCACS_OAWLDS>-OASCID = 1.
<TCACS_OAWLDS>-OATYID = 1.
<TCACS_OAWLDS>-OARUID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TCACS_OAWLDS-OSELSTRUCT, sy-vline,
  WA_TCACS_OAWLDS-OSELMETH, sy-vline,
  WA_TCACS_OAWLDS-OSELVAR, sy-vline,
  WA_TCACS_OAWLDS-TSELSTRUCT, sy-vline,
  WA_TCACS_OAWLDS-TSELMETH, sy-vline,
  WA_TCACS_OAWLDS-TSELVAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TCACS_OAWLDS 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_TCACS_OAWLDS 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_TCACS_OAWLDS INTO WA_TCACS_OAWLDS.


*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_TCACS_OAWLDS_STR, 
MANDT TYPE STRING,
OAWLDID TYPE STRING,
OASCID TYPE STRING,
OATYID TYPE STRING,
OARUID TYPE STRING,
OSELSTRUCT TYPE STRING,
OSELMETH TYPE STRING,
OSELVAR TYPE STRING,
TSELSTRUCT TYPE STRING,
TSELMETH TYPE STRING,
TSELVAR TYPE STRING,
PARSTRUCT TYPE STRING,
PARMETH TYPE STRING,
PARVAR TYPE STRING,
CTXTSTRUCT TYPE STRING,
CTXTMETH TYPE STRING,
CTXTVAR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TCACS_OAWLDS_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_TCACS_OAWLDS_STR-MANDT sy-vline 
WA_TCACS_OAWLDS_STR-OAWLDID sy-vline 
WA_TCACS_OAWLDS_STR-OASCID sy-vline 
WA_TCACS_OAWLDS_STR-OATYID sy-vline 
WA_TCACS_OAWLDS_STR-OARUID sy-vline 
WA_TCACS_OAWLDS_STR-OSELSTRUCT sy-vline 
WA_TCACS_OAWLDS_STR-OSELMETH sy-vline 
WA_TCACS_OAWLDS_STR-OSELVAR sy-vline 
WA_TCACS_OAWLDS_STR-TSELSTRUCT sy-vline 
WA_TCACS_OAWLDS_STR-TSELMETH sy-vline 
WA_TCACS_OAWLDS_STR-TSELVAR sy-vline 
WA_TCACS_OAWLDS_STR-PARSTRUCT sy-vline 
WA_TCACS_OAWLDS_STR-PARMETH sy-vline 
WA_TCACS_OAWLDS_STR-PARVAR sy-vline 
WA_TCACS_OAWLDS_STR-CTXTSTRUCT sy-vline 
WA_TCACS_OAWLDS_STR-CTXTMETH sy-vline 
WA_TCACS_OAWLDS_STR-CTXTVAR sy-vline      INTO ld_text SEPARATED BY SPACE.

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