ABAP Select data from SAP table J_3GMCVS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3GMCVS 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 J_3GMCVS. 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 J_3GMCVS 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_J_3GMCVS TYPE STANDARD TABLE OF J_3GMCVS,
      WA_J_3GMCVS TYPE J_3GMCVS,
      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: <J_3GMCVS> TYPE J_3GMCVS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3GMCVS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3GMCVS
  INTO TABLE IT_J_3GMCVS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3GMCVS
*  INTO TABLE @DATA(IT_J_3GMCVS2).
*--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_J_3GMCVS INDEX 1 INTO DATA(WA_J_3GMCVS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3GMCVS ASSIGNING <J_3GMCVS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3GMCVS>-J_3GEMPFAE = 1.
<J_3GMCVS>-EQUNR = 1.
<J_3GMCVS>-J_3GLVART = 1.
<J_3GMCVS>-J_3GMENGE = 1.
<J_3GMCVS>-J_3GMEINS = 1.

ENDLOOP.

LOOP AT IT_J_3GMCVS INTO WA_J_3GMCVS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3GMCVS-J_3GEBUKRS, sy-vline,
  WA_J_3GMCVS-J_3GEGSBER, sy-vline,
  WA_J_3GMCVS-J_3GEWERKS, sy-vline,
  WA_J_3GMCVS-J_3GVERWAL, sy-vline,
  WA_J_3GMCVS-EQTYP, sy-vline,
  WA_J_3GMCVS-EQART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3GMCVS 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_J_3GMCVS 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_J_3GMCVS INTO WA_J_3GMCVS.


*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.

*Conversion exit ALPHA, internal->external for field J_3GEMPFAE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GMCVS-J_3GEMPFAE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GMCVS-J_3GEMPFAE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field EQUNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GMCVS-EQUNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GMCVS-EQUNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field J_3GMEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_3GMCVS-J_3GMEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GMCVS-J_3GMEINS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field J_3GBELNRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3GMCVS-J_3GBELNRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3GMCVS-J_3GBELNRI.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_J_3GMCVS_STR, 
J_3GEMPFAE TYPE STRING,
EQUNR TYPE STRING,
J_3GLVART TYPE STRING,
J_3GMENGE TYPE STRING,
J_3GMEINS TYPE STRING,
J_3GEBUKRS TYPE STRING,
J_3GEGSBER TYPE STRING,
J_3GEWERKS TYPE STRING,
J_3GVERWAL TYPE STRING,
EQTYP TYPE STRING,
EQART TYPE STRING,
J_3GKZMENG TYPE STRING,
J_3GKONDE TYPE STRING,
J_3GTPLKZ TYPE STRING,
J_3GKATGR1 TYPE STRING,
J_3GKATGR2 TYPE STRING,
ANSWT TYPE STRING,
GJA_BCHWRT TYPE STRING,
J_3GMNWRT TYPE STRING,
J_3GBELNRI TYPE STRING,
WAERS TYPE STRING,
J_3GBELDAT TYPE STRING,
J_3GEIFR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3GMCVS_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_J_3GMCVS_STR-J_3GEMPFAE sy-vline 
WA_J_3GMCVS_STR-EQUNR sy-vline 
WA_J_3GMCVS_STR-J_3GLVART sy-vline 
WA_J_3GMCVS_STR-J_3GMENGE sy-vline 
WA_J_3GMCVS_STR-J_3GMEINS sy-vline 
WA_J_3GMCVS_STR-J_3GEBUKRS sy-vline 
WA_J_3GMCVS_STR-J_3GEGSBER sy-vline 
WA_J_3GMCVS_STR-J_3GEWERKS sy-vline 
WA_J_3GMCVS_STR-J_3GVERWAL sy-vline 
WA_J_3GMCVS_STR-EQTYP sy-vline 
WA_J_3GMCVS_STR-EQART sy-vline 
WA_J_3GMCVS_STR-J_3GKZMENG sy-vline 
WA_J_3GMCVS_STR-J_3GKONDE sy-vline 
WA_J_3GMCVS_STR-J_3GTPLKZ sy-vline 
WA_J_3GMCVS_STR-J_3GKATGR1 sy-vline 
WA_J_3GMCVS_STR-J_3GKATGR2 sy-vline 
WA_J_3GMCVS_STR-ANSWT sy-vline 
WA_J_3GMCVS_STR-GJA_BCHWRT sy-vline 
WA_J_3GMCVS_STR-J_3GMNWRT sy-vline 
WA_J_3GMCVS_STR-J_3GBELNRI sy-vline 
WA_J_3GMCVS_STR-WAERS sy-vline 
WA_J_3GMCVS_STR-J_3GBELDAT sy-vline 
WA_J_3GMCVS_STR-J_3GEIFR sy-vline      INTO ld_text SEPARATED BY SPACE.

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