ABAP Select data from SAP table DCTTYPCHK into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DCTTYPCHK
*  INTO TABLE @DATA(IT_DCTTYPCHK2).
*--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_DCTTYPCHK INDEX 1 INTO DATA(WA_DCTTYPCHK2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DCTTYPCHK>-CHK_ID = 1.
<DCTTYPCHK>-SAANAME = 1.
<DCTTYPCHK>-NAMESPACE = 1.
<DCTTYPCHK>-DDTYPENAME = 1.
<DCTTYPCHK>-ACCESSMODE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DCTTYPCHK-KEYDEF, sy-vline,
  WA_DCTTYPCHK-KEYKIND, sy-vline,
  WA_DCTTYPCHK-INDXHDR, sy-vline,
  WA_DCTTYPCHK-KEYDEFKIND, sy-vline,
  WA_DCTTYPCHK-KEY_ACC, sy-vline,
  WA_DCTTYPCHK-TTYPGEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DCTTYPCHK 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_DCTTYPCHK 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_DCTTYPCHK INTO WA_DCTTYPCHK.


*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_DCTTYPCHK_STR, 
CHK_ID TYPE STRING,
SAANAME TYPE STRING,
NAMESPACE TYPE STRING,
DDTYPENAME TYPE STRING,
ACCESSMODE TYPE STRING,
KEYDEF TYPE STRING,
KEYKIND TYPE STRING,
INDXHDR TYPE STRING,
KEYDEFKIND TYPE STRING,
KEY_ACC TYPE STRING,
TTYPGEN TYPE STRING,
TTYPUSED TYPE STRING,
RANGESROW TYPE STRING,
DIRECTTYPE TYPE STRING,
DTELACTIVE TYPE STRING,
STRUACTIVE TYPE STRING,
TTYPACTIVE TYPE STRING,
REFTYPE TYPE STRING,
CLIFREFTYP TYPE STRING,
ROWTYPEGEN TYPE STRING,
ROWTYPEKEY TYPE STRING,
PROXYTYPE TYPE STRING,
ABAP_LANG_VERS_USED_OBJ TYPE STRING,
TYPEXISTS TYPE STRING,
NOTVARC TYPE STRING,
NOTTMST TYPE STRING,
TYPLEN TYPE STRING,
TYPDBLEN TYPE STRING,
TYPDECIMAL TYPE STRING,
KEYFDCOUNT TYPE STRING,
KEYFDPOS TYPE STRING,
KEYSYNTAX TYPE STRING,
KFDEXIST TYPE STRING,
KEY_NOTAB TYPE STRING,
EMPTY_KEY TYPE STRING,
KEY_DOUBLE TYPE STRING,
TTRECURSIV TYPE STRING,
TTYPELEN TYPE STRING,
RTTYPFLAGS TYPE STRING,
RTTYPCTYP TYPE STRING,
RTTYPSTRUC TYPE STRING,
RTCTDIRT TYPE STRING,
OCCURS TYPE STRING,
PACKAGECHK TYPE STRING,
SECKEYCHK TYPE STRING,
ALIASNAME TYPE STRING,
SECKEYRESTR TYPE STRING,
SECKEYROWT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DCTTYPCHK_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_DCTTYPCHK_STR-CHK_ID sy-vline 
WA_DCTTYPCHK_STR-SAANAME sy-vline 
WA_DCTTYPCHK_STR-NAMESPACE sy-vline 
WA_DCTTYPCHK_STR-DDTYPENAME sy-vline 
WA_DCTTYPCHK_STR-ACCESSMODE sy-vline 
WA_DCTTYPCHK_STR-KEYDEF sy-vline 
WA_DCTTYPCHK_STR-KEYKIND sy-vline 
WA_DCTTYPCHK_STR-INDXHDR sy-vline 
WA_DCTTYPCHK_STR-KEYDEFKIND sy-vline 
WA_DCTTYPCHK_STR-KEY_ACC sy-vline 
WA_DCTTYPCHK_STR-TTYPGEN sy-vline 
WA_DCTTYPCHK_STR-TTYPUSED sy-vline 
WA_DCTTYPCHK_STR-RANGESROW sy-vline 
WA_DCTTYPCHK_STR-DIRECTTYPE sy-vline 
WA_DCTTYPCHK_STR-DTELACTIVE sy-vline 
WA_DCTTYPCHK_STR-STRUACTIVE sy-vline 
WA_DCTTYPCHK_STR-TTYPACTIVE sy-vline 
WA_DCTTYPCHK_STR-REFTYPE sy-vline 
WA_DCTTYPCHK_STR-CLIFREFTYP sy-vline 
WA_DCTTYPCHK_STR-ROWTYPEGEN sy-vline 
WA_DCTTYPCHK_STR-ROWTYPEKEY sy-vline 
WA_DCTTYPCHK_STR-PROXYTYPE sy-vline 
WA_DCTTYPCHK_STR-ABAP_LANG_VERS_USED_OBJ sy-vline 
WA_DCTTYPCHK_STR-TYPEXISTS sy-vline 
WA_DCTTYPCHK_STR-NOTVARC sy-vline 
WA_DCTTYPCHK_STR-NOTTMST sy-vline 
WA_DCTTYPCHK_STR-TYPLEN sy-vline 
WA_DCTTYPCHK_STR-TYPDBLEN sy-vline 
WA_DCTTYPCHK_STR-TYPDECIMAL sy-vline 
WA_DCTTYPCHK_STR-KEYFDCOUNT sy-vline 
WA_DCTTYPCHK_STR-KEYFDPOS sy-vline 
WA_DCTTYPCHK_STR-KEYSYNTAX sy-vline 
WA_DCTTYPCHK_STR-KFDEXIST sy-vline 
WA_DCTTYPCHK_STR-KEY_NOTAB sy-vline 
WA_DCTTYPCHK_STR-EMPTY_KEY sy-vline 
WA_DCTTYPCHK_STR-KEY_DOUBLE sy-vline 
WA_DCTTYPCHK_STR-TTRECURSIV sy-vline 
WA_DCTTYPCHK_STR-TTYPELEN sy-vline 
WA_DCTTYPCHK_STR-RTTYPFLAGS sy-vline 
WA_DCTTYPCHK_STR-RTTYPCTYP sy-vline 
WA_DCTTYPCHK_STR-RTTYPSTRUC sy-vline 
WA_DCTTYPCHK_STR-RTCTDIRT sy-vline 
WA_DCTTYPCHK_STR-OCCURS sy-vline 
WA_DCTTYPCHK_STR-PACKAGECHK sy-vline 
WA_DCTTYPCHK_STR-SECKEYCHK sy-vline 
WA_DCTTYPCHK_STR-ALIASNAME sy-vline 
WA_DCTTYPCHK_STR-SECKEYRESTR sy-vline 
WA_DCTTYPCHK_STR-SECKEYROWT sy-vline      INTO ld_text SEPARATED BY SPACE.

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