ABAP Select data from SAP table MPES_RTGV_HDR_INS2 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MPES_RTGV_HDR_INS2 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 MPES_RTGV_HDR_INS2. 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 MPES_RTGV_HDR_INS2 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_MPES_RTGV_HDR_INS2 TYPE STANDARD TABLE OF MPES_RTGV_HDR_INS2,
      WA_MPES_RTGV_HDR_INS2 TYPE MPES_RTGV_HDR_INS2,
      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: <MPES_RTGV_HDR_INS2> TYPE MPES_RTGV_HDR_INS2.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MPES_RTGV_HDR_INS2.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MPES_RTGV_HDR_INS2
  INTO TABLE IT_MPES_RTGV_HDR_INS2.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPES_RTGV_HDR_INS2
*  INTO TABLE @DATA(IT_MPES_RTGV_HDR_INS22).
*--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_MPES_RTGV_HDR_INS2 INDEX 1 INTO DATA(WA_MPES_RTGV_HDR_INS22).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MPES_RTGV_HDR_INS2 ASSIGNING <MPES_RTGV_HDR_INS2>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPES_RTGV_HDR_INS2>-PLNTY = 1.
<MPES_RTGV_HDR_INS2>-PLNNR = 1.
<MPES_RTGV_HDR_INS2>-PLNAL = 1.
<MPES_RTGV_HDR_INS2>-VERSN = 1.
<MPES_RTGV_HDR_INS2>-VERWE = 1.

ENDLOOP.

LOOP AT IT_MPES_RTGV_HDR_INS2 INTO WA_MPES_RTGV_HDR_INS2.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPES_RTGV_HDR_INS2-WERKS, sy-vline,
  WA_MPES_RTGV_HDR_INS2-STATU, sy-vline,
  WA_MPES_RTGV_HDR_INS2-PLNME, sy-vline,
  WA_MPES_RTGV_HDR_INS2-LOSVN, sy-vline,
  WA_MPES_RTGV_HDR_INS2-LOSBS, sy-vline,
  WA_MPES_RTGV_HDR_INS2-VAGRP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPES_RTGV_HDR_INS2 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_MPES_RTGV_HDR_INS2 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_MPES_RTGV_HDR_INS2 INTO WA_MPES_RTGV_HDR_INS2.


*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 PLNNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_HDR_INS2-PLNNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_HDR_INS2-PLNNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PLNAL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_HDR_INS2-PLNAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_HDR_INS2-PLNAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_HDR_INS2-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_HDR_INS2-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field PLNME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MPES_RTGV_HDR_INS2-PLNME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPES_RTGV_HDR_INS2-PLNME.
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_MPES_RTGV_HDR_INS2_STR, 
PLNTY TYPE STRING,
PLNNR TYPE STRING,
PLNAL TYPE STRING,
VERSN TYPE STRING,
VERWE TYPE STRING,
WERKS TYPE STRING,
STATU TYPE STRING,
PLNME TYPE STRING,
LOSVN TYPE STRING,
LOSBS TYPE STRING,
VAGRP TYPE STRING,
KTEXT TYPE STRING,
KAP_ARBID TYPE STRING,
ALTEXT TYPE STRING,
DUMMY_PLKO_INCL_EEW_PS TYPE STRING,
DUMMY_PLVK_INCL_EEW_PS TYPE STRING,
SUBTYPE TYPE STRING,
REWORK TYPE STRING,
RELAXED TYPE STRING,
EXECUTION_IN_ME TYPE STRING,
SERIALIZED_PRODUCTION TYPE STRING,
CHANGE_RECORD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPES_RTGV_HDR_INS2_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_MPES_RTGV_HDR_INS2_STR-PLNTY sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-PLNNR sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-PLNAL sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-VERSN sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-VERWE sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-WERKS sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-STATU sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-PLNME sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-LOSVN sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-LOSBS sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-VAGRP sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-KTEXT sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-KAP_ARBID sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-ALTEXT sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-DUMMY_PLKO_INCL_EEW_PS sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-DUMMY_PLVK_INCL_EEW_PS sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-SUBTYPE sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-REWORK sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-RELAXED sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-EXECUTION_IN_ME sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-SERIALIZED_PRODUCTION sy-vline 
WA_MPES_RTGV_HDR_INS2_STR-CHANGE_RECORD sy-vline      INTO ld_text SEPARATED BY SPACE.

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