ABAP Select data from SAP table JCDS1 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP JCDS1 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 JCDS1. 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 JCDS1 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_JCDS1 TYPE STANDARD TABLE OF JCDS1,
      WA_JCDS1 TYPE JCDS1,
      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: <JCDS1> TYPE JCDS1.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_JCDS1.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM JCDS1
  INTO TABLE IT_JCDS1.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM JCDS1
*  INTO TABLE @DATA(IT_JCDS12).
*--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_JCDS1 INDEX 1 INTO DATA(WA_JCDS12).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_JCDS1 ASSIGNING <JCDS1>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<JCDS1>-MANDT = 1.
<JCDS1>-OBJNR = 1.
<JCDS1>-STAT = 1.
<JCDS1>-CHGNR = 1.
<JCDS1>-USNAM = 1.

ENDLOOP.

LOOP AT IT_JCDS1 INTO WA_JCDS1.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_JCDS1-UDATE, sy-vline,
  WA_JCDS1-UTIME, sy-vline,
  WA_JCDS1-TCODE, sy-vline,
  WA_JCDS1-CDTCODE, sy-vline,
  WA_JCDS1-INACT, sy-vline,
  WA_JCDS1-CHIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_JCDS1 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_JCDS1 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_JCDS1 INTO WA_JCDS1.


*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_JCDS1_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
STAT TYPE STRING,
CHGNR TYPE STRING,
USNAM TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
TCODE TYPE STRING,
CDTCODE TYPE STRING,
INACT TYPE STRING,
CHIND TYPE STRING,
_DATAAGING TYPE STRING,END OF T_EKKO_STR.
DATA: WA_JCDS1_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_JCDS1_STR-MANDT sy-vline 
WA_JCDS1_STR-OBJNR sy-vline 
WA_JCDS1_STR-STAT sy-vline 
WA_JCDS1_STR-CHGNR sy-vline 
WA_JCDS1_STR-USNAM sy-vline 
WA_JCDS1_STR-UDATE sy-vline 
WA_JCDS1_STR-UTIME sy-vline 
WA_JCDS1_STR-TCODE sy-vline 
WA_JCDS1_STR-CDTCODE sy-vline 
WA_JCDS1_STR-INACT sy-vline 
WA_JCDS1_STR-CHIND sy-vline 
WA_JCDS1_STR-_DATAAGING sy-vline      INTO ld_text SEPARATED BY SPACE.

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