ABAP Select data from SAP table /CFG/TDC_FK_CHK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /CFG/TDC_FK_CHK 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 /CFG/TDC_FK_CHK. 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 /CFG/TDC_FK_CHK 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_/CFG/TDC_FK_CHK TYPE STANDARD TABLE OF /CFG/TDC_FK_CHK,
      WA_/CFG/TDC_FK_CHK TYPE /CFG/TDC_FK_CHK,
      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: </CFG/TDC_FK_CHK> TYPE /CFG/TDC_FK_CHK.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /CFG/TDC_FK_CHK
  INTO TABLE IT_/CFG/TDC_FK_CHK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CFG/TDC_FK_CHK
*  INTO TABLE @DATA(IT_/CFG/TDC_FK_CHK2).
*--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_/CFG/TDC_FK_CHK INDEX 1 INTO DATA(WA_/CFG/TDC_FK_CHK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/CFG/TDC_FK_CHK ASSIGNING </CFG/TDC_FK_CHK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CFG/TDC_FK_CHK>-MANDT = 1.
</CFG/TDC_FK_CHK>-TDC_ALIAS = 1.
</CFG/TDC_FK_CHK>-ACT_ID = 1.
</CFG/TDC_FK_CHK>-BB_ID = 1.
</CFG/TDC_FK_CHK>-SOLU_ID = 1.

ENDLOOP.

LOOP AT IT_/CFG/TDC_FK_CHK INTO WA_/CFG/TDC_FK_CHK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CFG/TDC_FK_CHK-SUB_OBJ_ID, sy-vline,
  WA_/CFG/TDC_FK_CHK-TABLENAME, sy-vline,
  WA_/CFG/TDC_FK_CHK-FIELD, sy-vline,
  WA_/CFG/TDC_FK_CHK-FILENAME, sy-vline,
  WA_/CFG/TDC_FK_CHK-IS_DEMO_DATA, sy-vline,
  WA_/CFG/TDC_FK_CHK-TDC_NAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CFG/TDC_FK_CHK 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_/CFG/TDC_FK_CHK 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_/CFG/TDC_FK_CHK INTO WA_/CFG/TDC_FK_CHK.


*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_/CFG/TDC_FK_CHK_STR, 
MANDT TYPE STRING,
TDC_ALIAS TYPE STRING,
ACT_ID TYPE STRING,
BB_ID TYPE STRING,
SOLU_ID TYPE STRING,
SUB_OBJ_ID TYPE STRING,
TABLENAME TYPE STRING,
FIELD TYPE STRING,
FILENAME TYPE STRING,
IS_DEMO_DATA TYPE STRING,
TDC_NAME TYPE STRING,
TDC_DESCR TYPE STRING,
PARAMETER_NAME TYPE STRING,
CENTRALDATA TYPE STRING,
CUS_OBJ_ID TYPE STRING,
IS_PK TYPE STRING,
IS_FK TYPE STRING,
EXP_DESCR TYPE STRING,
CHECKTABLE TYPE STRING,
CHECKTABLE_FIELD TYPE STRING,
CUST_OBJTYPE TYPE STRING,
ACT_TYPE TYPE STRING,
NOT_IN_NDM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CFG/TDC_FK_CHK_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_/CFG/TDC_FK_CHK_STR-MANDT sy-vline 
WA_/CFG/TDC_FK_CHK_STR-TDC_ALIAS sy-vline 
WA_/CFG/TDC_FK_CHK_STR-ACT_ID sy-vline 
WA_/CFG/TDC_FK_CHK_STR-BB_ID sy-vline 
WA_/CFG/TDC_FK_CHK_STR-SOLU_ID sy-vline 
WA_/CFG/TDC_FK_CHK_STR-SUB_OBJ_ID sy-vline 
WA_/CFG/TDC_FK_CHK_STR-TABLENAME sy-vline 
WA_/CFG/TDC_FK_CHK_STR-FIELD sy-vline 
WA_/CFG/TDC_FK_CHK_STR-FILENAME sy-vline 
WA_/CFG/TDC_FK_CHK_STR-IS_DEMO_DATA sy-vline 
WA_/CFG/TDC_FK_CHK_STR-TDC_NAME sy-vline 
WA_/CFG/TDC_FK_CHK_STR-TDC_DESCR sy-vline 
WA_/CFG/TDC_FK_CHK_STR-PARAMETER_NAME sy-vline 
WA_/CFG/TDC_FK_CHK_STR-CENTRALDATA sy-vline 
WA_/CFG/TDC_FK_CHK_STR-CUS_OBJ_ID sy-vline 
WA_/CFG/TDC_FK_CHK_STR-IS_PK sy-vline 
WA_/CFG/TDC_FK_CHK_STR-IS_FK sy-vline 
WA_/CFG/TDC_FK_CHK_STR-EXP_DESCR sy-vline 
WA_/CFG/TDC_FK_CHK_STR-CHECKTABLE sy-vline 
WA_/CFG/TDC_FK_CHK_STR-CHECKTABLE_FIELD sy-vline 
WA_/CFG/TDC_FK_CHK_STR-CUST_OBJTYPE sy-vline 
WA_/CFG/TDC_FK_CHK_STR-ACT_TYPE sy-vline 
WA_/CFG/TDC_FK_CHK_STR-NOT_IN_NDM sy-vline      INTO ld_text SEPARATED BY SPACE.

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