ABAP Select data from SAP table RN2TRANSPORTHEADER into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP RN2TRANSPORTHEADER 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 RN2TRANSPORTHEADER. 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 RN2TRANSPORTHEADER 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_RN2TRANSPORTHEADER TYPE STANDARD TABLE OF RN2TRANSPORTHEADER,
      WA_RN2TRANSPORTHEADER TYPE RN2TRANSPORTHEADER,
      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: <RN2TRANSPORTHEADER> TYPE RN2TRANSPORTHEADER.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_RN2TRANSPORTHEADER.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM RN2TRANSPORTHEADER
  INTO TABLE IT_RN2TRANSPORTHEADER.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM RN2TRANSPORTHEADER
*  INTO TABLE @DATA(IT_RN2TRANSPORTHEADER2).
*--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_RN2TRANSPORTHEADER INDEX 1 INTO DATA(WA_RN2TRANSPORTHEADER2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_RN2TRANSPORTHEADER ASSIGNING <RN2TRANSPORTHEADER>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<RN2TRANSPORTHEADER>-HTYP1 = 1.
<RN2TRANSPORTHEADER>-HTYP2 = 1.
<RN2TRANSPORTHEADER>-HINFO = 1.
<RN2TRANSPORTHEADER>-HINFO2 = 1.
<RN2TRANSPORTHEADER>-HTRANSFORMATION = 1.

ENDLOOP.

LOOP AT IT_RN2TRANSPORTHEADER INTO WA_RN2TRANSPORTHEADER.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_RN2TRANSPORTHEADER-HLICNAME, sy-vline,
  WA_RN2TRANSPORTHEADER-HLICKEY, sy-vline,
  WA_RN2TRANSPORTHEADER-HEXPNAME, sy-vline,
  WA_RN2TRANSPORTHEADER-HEXPSYS, sy-vline,
  WA_RN2TRANSPORTHEADER-HEXPMANDT, sy-vline,
  WA_RN2TRANSPORTHEADER-HEXPEINRI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_RN2TRANSPORTHEADER 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_RN2TRANSPORTHEADER 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_RN2TRANSPORTHEADER INTO WA_RN2TRANSPORTHEADER.


*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 HEXPNAME
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2TRANSPORTHEADER-HEXPNAME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2TRANSPORTHEADER-HEXPNAME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field HEXPEINRI
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_RN2TRANSPORTHEADER-HEXPEINRI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2TRANSPORTHEADER-HEXPEINRI.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field HLANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_RN2TRANSPORTHEADER-HLANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_RN2TRANSPORTHEADER-HLANGU.
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_RN2TRANSPORTHEADER_STR, 
HTYP1 TYPE STRING,
HTYP2 TYPE STRING,
HINFO TYPE STRING,
HINFO2 TYPE STRING,
HTRANSFORMATION TYPE STRING,
HLICNAME TYPE STRING,
HLICKEY TYPE STRING,
HEXPNAME TYPE STRING,
HEXPSYS TYPE STRING,
HEXPMANDT TYPE STRING,
HEXPEINRI TYPE STRING,
HRELEASE TYPE STRING,
HPATCH TYPE STRING,
HORELEASE TYPE STRING,
HOPATCH TYPE STRING,
HLANGU TYPE STRING,
HCREATEUSER TYPE STRING,
HCREATEDATE TYPE STRING,
HCREATETIME TYPE STRING,
HDOCUKEY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_RN2TRANSPORTHEADER_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_RN2TRANSPORTHEADER_STR-HTYP1 sy-vline 
WA_RN2TRANSPORTHEADER_STR-HTYP2 sy-vline 
WA_RN2TRANSPORTHEADER_STR-HINFO sy-vline 
WA_RN2TRANSPORTHEADER_STR-HINFO2 sy-vline 
WA_RN2TRANSPORTHEADER_STR-HTRANSFORMATION sy-vline 
WA_RN2TRANSPORTHEADER_STR-HLICNAME sy-vline 
WA_RN2TRANSPORTHEADER_STR-HLICKEY sy-vline 
WA_RN2TRANSPORTHEADER_STR-HEXPNAME sy-vline 
WA_RN2TRANSPORTHEADER_STR-HEXPSYS sy-vline 
WA_RN2TRANSPORTHEADER_STR-HEXPMANDT sy-vline 
WA_RN2TRANSPORTHEADER_STR-HEXPEINRI sy-vline 
WA_RN2TRANSPORTHEADER_STR-HRELEASE sy-vline 
WA_RN2TRANSPORTHEADER_STR-HPATCH sy-vline 
WA_RN2TRANSPORTHEADER_STR-HORELEASE sy-vline 
WA_RN2TRANSPORTHEADER_STR-HOPATCH sy-vline 
WA_RN2TRANSPORTHEADER_STR-HLANGU sy-vline 
WA_RN2TRANSPORTHEADER_STR-HCREATEUSER sy-vline 
WA_RN2TRANSPORTHEADER_STR-HCREATEDATE sy-vline 
WA_RN2TRANSPORTHEADER_STR-HCREATETIME sy-vline 
WA_RN2TRANSPORTHEADER_STR-HDOCUKEY sy-vline      INTO ld_text SEPARATED BY SPACE.

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