ABAP Select data from SAP table J_3RM_MIG_RN_REG_S into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3RM_MIG_RN_REG_S 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_3RM_MIG_RN_REG_S. 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_3RM_MIG_RN_REG_S 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_3RM_MIG_RN_REG_S TYPE STANDARD TABLE OF J_3RM_MIG_RN_REG_S,
      WA_J_3RM_MIG_RN_REG_S TYPE J_3RM_MIG_RN_REG_S,
      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_3RM_MIG_RN_REG_S> TYPE J_3RM_MIG_RN_REG_S.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3RM_MIG_RN_REG_S.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3RM_MIG_RN_REG_S
  INTO TABLE IT_J_3RM_MIG_RN_REG_S.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3RM_MIG_RN_REG_S
*  INTO TABLE @DATA(IT_J_3RM_MIG_RN_REG_S2).
*--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_3RM_MIG_RN_REG_S INDEX 1 INTO DATA(WA_J_3RM_MIG_RN_REG_S2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3RM_MIG_RN_REG_S ASSIGNING <J_3RM_MIG_RN_REG_S>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3RM_MIG_RN_REG_S>-SENDER_TECHNICAL_ID = 1.
<J_3RM_MIG_RN_REG_S>-MANDT = 1.
<J_3RM_MIG_RN_REG_S>-RN_REG_ID = 1.
<J_3RM_MIG_RN_REG_S>-RN_REG_YEAR = 1.
<J_3RM_MIG_RN_REG_S>-RN_EXT_NUM = 1.

ENDLOOP.

LOOP AT IT_J_3RM_MIG_RN_REG_S INTO WA_J_3RM_MIG_RN_REG_S.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3RM_MIG_RN_REG_S-RN_REG_DATE, sy-vline,
  WA_J_3RM_MIG_RN_REG_S-SRC_OPER_TYPE, sy-vline,
  WA_J_3RM_MIG_RN_REG_S-MANUALLY_CREATED, sy-vline,
  WA_J_3RM_MIG_RN_REG_S-MATNR, sy-vline,
  WA_J_3RM_MIG_RN_REG_S-ASSET_NUM, sy-vline,
  WA_J_3RM_MIG_RN_REG_S-ASSET_SUBNUM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3RM_MIG_RN_REG_S 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_3RM_MIG_RN_REG_S 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_3RM_MIG_RN_REG_S INTO WA_J_3RM_MIG_RN_REG_S.


*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 RN_REG_ID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-RN_REG_ID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-RN_REG_ID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field RN_REG_YEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-RN_REG_YEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-RN_REG_YEAR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit MATN1, internal->external for field MATNR
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-MATNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-MATNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ASSET_NUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-ASSET_NUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-ASSET_NUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ASSET_SUBNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-ASSET_SUBNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-ASSET_SUBNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GERNR, internal->external for field SERIAL_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_GERNR_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-SERIAL_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-SERIAL_NUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSP, internal->external for field WBS_ELEMENT
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-WBS_ELEMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-WBS_ELEMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field INVEST_ORDER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-INVEST_ORDER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-INVEST_ORDER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_3RM_MIG_RN_REG_S-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RM_MIG_RN_REG_S-MEINS.
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_3RM_MIG_RN_REG_S_STR, 
SENDER_TECHNICAL_ID TYPE STRING,
MANDT TYPE STRING,
RN_REG_ID TYPE STRING,
RN_REG_YEAR TYPE STRING,
RN_EXT_NUM TYPE STRING,
RN_REG_DATE TYPE STRING,
SRC_OPER_TYPE TYPE STRING,
MANUALLY_CREATED TYPE STRING,
MATNR TYPE STRING,
ASSET_NUM TYPE STRING,
ASSET_SUBNUM TYPE STRING,
COMPANY_CODE TYPE STRING,
COUNTRY_OF_ORIGIN TYPE STRING,
BATCH TYPE STRING,
SERIAL_NUMBER TYPE STRING,
WBS_ELEMENT TYPE STRING,
INVEST_ORDER TYPE STRING,
MEINS TYPE STRING,
AVAIL_QUANTITY TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_ON TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_ON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3RM_MIG_RN_REG_S_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_3RM_MIG_RN_REG_S_STR-SENDER_TECHNICAL_ID sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-MANDT sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-RN_REG_ID sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-RN_REG_YEAR sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-RN_EXT_NUM sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-RN_REG_DATE sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-SRC_OPER_TYPE sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-MANUALLY_CREATED sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-MATNR sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-ASSET_NUM sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-ASSET_SUBNUM sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-COMPANY_CODE sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-COUNTRY_OF_ORIGIN sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-BATCH sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-SERIAL_NUMBER sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-WBS_ELEMENT sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-INVEST_ORDER sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-MEINS sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-AVAIL_QUANTITY sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-CREATED_BY sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-CREATED_ON sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-CHANGED_BY sy-vline 
WA_J_3RM_MIG_RN_REG_S_STR-CHANGED_ON sy-vline      INTO ld_text SEPARATED BY SPACE.

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