ABAP Select data from SAP table J_3RV_ST12 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3RV_ST12 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_3RV_ST12. 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_3RV_ST12 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_3RV_ST12 TYPE STANDARD TABLE OF J_3RV_ST12,
      WA_J_3RV_ST12 TYPE J_3RV_ST12,
      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_3RV_ST12> TYPE J_3RV_ST12.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3RV_ST12.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3RV_ST12
  INTO TABLE IT_J_3RV_ST12.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3RV_ST12
*  INTO TABLE @DATA(IT_J_3RV_ST122).
*--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_3RV_ST12 INDEX 1 INTO DATA(WA_J_3RV_ST122).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3RV_ST12 ASSIGNING <J_3RV_ST12>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3RV_ST12>-PLACES = 1.
<J_3RV_ST12>-BRGEW = 1.
<J_3RV_ST12>-LSMENG = 1.
<J_3RV_ST12>-LFIMG = 1.
<J_3RV_ST12>-VRKME = 1.

ENDLOOP.

LOOP AT IT_J_3RV_ST12 INTO WA_J_3RV_ST12.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3RV_ST12-NTGEW, sy-vline,
  WA_J_3RV_ST12-GEWEI, sy-vline,
  WA_J_3RV_ST12-NETWR, sy-vline,
  WA_J_3RV_ST12-VAT, sy-vline,
  WA_J_3RV_ST12-WRBTR, sy-vline,
  WA_J_3RV_ST12-WAERK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3RV_ST12 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_3RV_ST12 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_3RV_ST12 INTO WA_J_3RV_ST12.


*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 CUNIT, internal->external for field VRKME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_3RV_ST12-VRKME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RV_ST12-VRKME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_3RV_ST12-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RV_ST12-GEWEI.
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_3RV_ST12_STR, 
PLACES TYPE STRING,
BRGEW TYPE STRING,
LSMENG TYPE STRING,
LFIMG TYPE STRING,
VRKME TYPE STRING,
NTGEW TYPE STRING,
GEWEI TYPE STRING,
NETWR TYPE STRING,
VAT TYPE STRING,
WRBTR TYPE STRING,
WAERK TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3RV_ST12_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_3RV_ST12_STR-PLACES sy-vline 
WA_J_3RV_ST12_STR-BRGEW sy-vline 
WA_J_3RV_ST12_STR-LSMENG sy-vline 
WA_J_3RV_ST12_STR-LFIMG sy-vline 
WA_J_3RV_ST12_STR-VRKME sy-vline 
WA_J_3RV_ST12_STR-NTGEW sy-vline 
WA_J_3RV_ST12_STR-GEWEI sy-vline 
WA_J_3RV_ST12_STR-NETWR sy-vline 
WA_J_3RV_ST12_STR-VAT sy-vline 
WA_J_3RV_ST12_STR-WRBTR sy-vline 
WA_J_3RV_ST12_STR-WAERK sy-vline      INTO ld_text SEPARATED BY SPACE.

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