ABAP Select data from SAP table J_3RT1_HEAD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP J_3RT1_HEAD 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_3RT1_HEAD. 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_3RT1_HEAD 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_3RT1_HEAD TYPE STANDARD TABLE OF J_3RT1_HEAD,
      WA_J_3RT1_HEAD TYPE J_3RT1_HEAD,
      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_3RT1_HEAD> TYPE J_3RT1_HEAD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_J_3RT1_HEAD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM J_3RT1_HEAD
  INTO TABLE IT_J_3RT1_HEAD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM J_3RT1_HEAD
*  INTO TABLE @DATA(IT_J_3RT1_HEAD2).
*--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_3RT1_HEAD INDEX 1 INTO DATA(WA_J_3RT1_HEAD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_J_3RT1_HEAD ASSIGNING <J_3RT1_HEAD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<J_3RT1_HEAD>-TKNUM = 1.
<J_3RT1_HEAD>-ERDAT = 1.
<J_3RT1_HEAD>-P_DAY = 1.
<J_3RT1_HEAD>-P_MONTH = 1.
<J_3RT1_HEAD>-P_GJAHR = 1.

ENDLOOP.

LOOP AT IT_J_3RT1_HEAD INTO WA_J_3RT1_HEAD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_J_3RT1_HEAD-VKORG, sy-vline,
  WA_J_3RT1_HEAD-GONAM, sy-vline,
  WA_J_3RT1_HEAD-GOBANK, sy-vline,
  WA_J_3RT1_HEAD-GOOKPO, sy-vline,
  WA_J_3RT1_HEAD-GPNUM, sy-vline,
  WA_J_3RT1_HEAD-GPNAM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_J_3RT1_HEAD 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_3RT1_HEAD 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_3RT1_HEAD INTO WA_J_3RT1_HEAD.


*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 GJAHR, internal->external for field P_GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_J_3RT1_HEAD-P_GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RT1_HEAD-P_GJAHR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field GPNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_J_3RT1_HEAD-GPNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RT1_HEAD-GPNUM.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field GEWEI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_J_3RT1_HEAD-GEWEI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_J_3RT1_HEAD-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_3RT1_HEAD_STR, 
TKNUM TYPE STRING,
ERDAT TYPE STRING,
P_DAY TYPE STRING,
P_MONTH TYPE STRING,
P_GJAHR TYPE STRING,
VKORG TYPE STRING,
GONAM TYPE STRING,
GOBANK TYPE STRING,
GOOKPO TYPE STRING,
GPNUM TYPE STRING,
GPNAM TYPE STRING,
GPBANK TYPE STRING,
GPOKPO TYPE STRING,
PLNAM TYPE STRING,
PLBANK TYPE STRING,
PLOKPO TYPE STRING,
EKNAM TYPE STRING,
EKBANK TYPE STRING,
PONAM TYPE STRING,
PRNAM TYPE STRING,
BRGEW TYPE STRING,
BRGEW_W TYPE STRING,
NTGEW TYPE STRING,
NTGEW_W TYPE STRING,
GEWEI TYPE STRING,
TOTNAM TYPE STRING,
TOTPLC TYPE STRING,
TOTLIN TYPE STRING,
TOTSUM TYPE STRING,
NETWR TYPE STRING,
WAERS TYPE STRING,
NAME1 TYPE STRING,
NAME2 TYPE STRING,
TELNR TYPE STRING,
CHIEF_ACC TYPE STRING,
REG_NUM TYPE STRING,
SERIA TYPE STRING,
NUM TYPE STRING,
SROK_DOCT TYPE STRING,
CAR_MAKE TYPE STRING,
CAR_NUM TYPE STRING,
CUSTOMER TYPE STRING,
DRIVER TYPE STRING,
CERTIF TYPE STRING,
LICENSE_TYPE TYPE STRING,
LICENSE_REGN TYPE STRING,
LICENSE_SER TYPE STRING,
LICENSE_NUM TYPE STRING,
TRANSP_TYPE TYPE STRING,
TRANSP_CODE TYPE STRING,
ROUTE TYPE STRING,
READDR TYPE STRING,
TRAILER_1 TYPE STRING,
TRAILER_NUM_1 TYPE STRING,
GARAGE_1 TYPE STRING,
TRAILER_2 TYPE STRING,
TRAILER_NUM_2 TYPE STRING,
GARAGE_2 TYPE STRING,
POGRN TYPE STRING,
DELIV_ALLOW_POS TYPE STRING,
DELIV_ALLOW_NAME TYPE STRING,
BRGEW_W_TO_DELIV TYPE STRING,
PLCN_W_TO_DELIV TYPE STRING,END OF T_EKKO_STR.
DATA: WA_J_3RT1_HEAD_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_3RT1_HEAD_STR-TKNUM sy-vline 
WA_J_3RT1_HEAD_STR-ERDAT sy-vline 
WA_J_3RT1_HEAD_STR-P_DAY sy-vline 
WA_J_3RT1_HEAD_STR-P_MONTH sy-vline 
WA_J_3RT1_HEAD_STR-P_GJAHR sy-vline 
WA_J_3RT1_HEAD_STR-VKORG sy-vline 
WA_J_3RT1_HEAD_STR-GONAM sy-vline 
WA_J_3RT1_HEAD_STR-GOBANK sy-vline 
WA_J_3RT1_HEAD_STR-GOOKPO sy-vline 
WA_J_3RT1_HEAD_STR-GPNUM sy-vline 
WA_J_3RT1_HEAD_STR-GPNAM sy-vline 
WA_J_3RT1_HEAD_STR-GPBANK sy-vline 
WA_J_3RT1_HEAD_STR-GPOKPO sy-vline 
WA_J_3RT1_HEAD_STR-PLNAM sy-vline 
WA_J_3RT1_HEAD_STR-PLBANK sy-vline 
WA_J_3RT1_HEAD_STR-PLOKPO sy-vline 
WA_J_3RT1_HEAD_STR-EKNAM sy-vline 
WA_J_3RT1_HEAD_STR-EKBANK sy-vline 
WA_J_3RT1_HEAD_STR-PONAM sy-vline 
WA_J_3RT1_HEAD_STR-PRNAM sy-vline 
WA_J_3RT1_HEAD_STR-BRGEW sy-vline 
WA_J_3RT1_HEAD_STR-BRGEW_W sy-vline 
WA_J_3RT1_HEAD_STR-NTGEW sy-vline 
WA_J_3RT1_HEAD_STR-NTGEW_W sy-vline 
WA_J_3RT1_HEAD_STR-GEWEI sy-vline 
WA_J_3RT1_HEAD_STR-TOTNAM sy-vline 
WA_J_3RT1_HEAD_STR-TOTPLC sy-vline 
WA_J_3RT1_HEAD_STR-TOTLIN sy-vline 
WA_J_3RT1_HEAD_STR-TOTSUM sy-vline 
WA_J_3RT1_HEAD_STR-NETWR sy-vline 
WA_J_3RT1_HEAD_STR-WAERS sy-vline 
WA_J_3RT1_HEAD_STR-NAME1 sy-vline 
WA_J_3RT1_HEAD_STR-NAME2 sy-vline 
WA_J_3RT1_HEAD_STR-TELNR sy-vline 
WA_J_3RT1_HEAD_STR-CHIEF_ACC sy-vline 
WA_J_3RT1_HEAD_STR-REG_NUM sy-vline 
WA_J_3RT1_HEAD_STR-SERIA sy-vline 
WA_J_3RT1_HEAD_STR-NUM sy-vline 
WA_J_3RT1_HEAD_STR-SROK_DOCT sy-vline 
WA_J_3RT1_HEAD_STR-CAR_MAKE sy-vline 
WA_J_3RT1_HEAD_STR-CAR_NUM sy-vline 
WA_J_3RT1_HEAD_STR-CUSTOMER sy-vline 
WA_J_3RT1_HEAD_STR-DRIVER sy-vline 
WA_J_3RT1_HEAD_STR-CERTIF sy-vline 
WA_J_3RT1_HEAD_STR-LICENSE_TYPE sy-vline 
WA_J_3RT1_HEAD_STR-LICENSE_REGN sy-vline 
WA_J_3RT1_HEAD_STR-LICENSE_SER sy-vline 
WA_J_3RT1_HEAD_STR-LICENSE_NUM sy-vline 
WA_J_3RT1_HEAD_STR-TRANSP_TYPE sy-vline 
WA_J_3RT1_HEAD_STR-TRANSP_CODE sy-vline 
WA_J_3RT1_HEAD_STR-ROUTE sy-vline 
WA_J_3RT1_HEAD_STR-READDR sy-vline 
WA_J_3RT1_HEAD_STR-TRAILER_1 sy-vline 
WA_J_3RT1_HEAD_STR-TRAILER_NUM_1 sy-vline 
WA_J_3RT1_HEAD_STR-GARAGE_1 sy-vline 
WA_J_3RT1_HEAD_STR-TRAILER_2 sy-vline 
WA_J_3RT1_HEAD_STR-TRAILER_NUM_2 sy-vline 
WA_J_3RT1_HEAD_STR-GARAGE_2 sy-vline 
WA_J_3RT1_HEAD_STR-POGRN sy-vline 
WA_J_3RT1_HEAD_STR-DELIV_ALLOW_POS sy-vline 
WA_J_3RT1_HEAD_STR-DELIV_ALLOW_NAME sy-vline 
WA_J_3RT1_HEAD_STR-BRGEW_W_TO_DELIV sy-vline 
WA_J_3RT1_HEAD_STR-PLCN_W_TO_DELIV sy-vline      INTO ld_text SEPARATED BY SPACE.

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