ABAP Select data from SAP table CRM_JCDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRM_JCDS
*  INTO TABLE @DATA(IT_CRM_JCDS2).
*--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_CRM_JCDS INDEX 1 INTO DATA(WA_CRM_JCDS2).


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

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

ENDLOOP.

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

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


*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_CRM_JCDS_STR, 
MANDT TYPE STRING,
OBJNR TYPE STRING,
STAT TYPE STRING,
CHGNR TYPE STRING,
USNAM TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
CDTCODE TYPE STRING,
INACT TYPE STRING,
CHIND TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRM_JCDS_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_CRM_JCDS_STR-MANDT sy-vline 
WA_CRM_JCDS_STR-OBJNR sy-vline 
WA_CRM_JCDS_STR-STAT sy-vline 
WA_CRM_JCDS_STR-CHGNR sy-vline 
WA_CRM_JCDS_STR-USNAM sy-vline 
WA_CRM_JCDS_STR-UDATE sy-vline 
WA_CRM_JCDS_STR-UTIME sy-vline 
WA_CRM_JCDS_STR-CDTCODE sy-vline 
WA_CRM_JCDS_STR-INACT sy-vline 
WA_CRM_JCDS_STR-CHIND sy-vline      INTO ld_text SEPARATED BY SPACE.

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