ABAP Select data from SAP table MCHPVS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MCHPVS
*  INTO TABLE @DATA(IT_MCHPVS2).
*--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_MCHPVS INDEX 1 INTO DATA(WA_MCHPVS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MCHPVS>-MANDT = 1.
<MCHPVS>-EBRID = 1.
<MCHPVS>-VERSION = 1.
<MCHPVS>-ACONNID = 1.
<MCHPVS>-OBJECT_ID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MCHPVS-DOC_TYPE, sy-vline,
  WA_MCHPVS-AUFNR, sy-vline,
  WA_MCHPVS-AUART, sy-vline,
  WA_MCHPVS-AUFTEXT, sy-vline,
  WA_MCHPVS-PLOS, sy-vline,
  WA_MCHPVS-ART, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MCHPVS 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_MCHPVS 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_MCHPVS INTO WA_MCHPVS.


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

*Conversion exit ALPHA, internal->external for field PLOS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MCHPVS-PLOS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MCHPVS-PLOS.
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_MCHPVS_STR, 
MANDT TYPE STRING,
EBRID TYPE STRING,
VERSION TYPE STRING,
ACONNID TYPE STRING,
OBJECT_ID TYPE STRING,
DOC_TYPE TYPE STRING,
AUFNR TYPE STRING,
AUART TYPE STRING,
AUFTEXT TYPE STRING,
PLOS TYPE STRING,
ART TYPE STRING,
HERKUNFT TYPE STRING,
CRID TYPE STRING,
ADRES TYPE STRING,
CONNTXT TYPE STRING,
ARCH_USER TYPE STRING,
USER_NAM_FIRST TYPE STRING,
USER_NAM_LAST TYPE STRING,
ARCH_DATE TYPE STRING,
ARCH_TIME TYPE STRING,
EBRCOVERID TYPE STRING,
EBRCOVERTXT TYPE STRING,
PHSEQ TYPE STRING,
HTML_MODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MCHPVS_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_MCHPVS_STR-MANDT sy-vline 
WA_MCHPVS_STR-EBRID sy-vline 
WA_MCHPVS_STR-VERSION sy-vline 
WA_MCHPVS_STR-ACONNID sy-vline 
WA_MCHPVS_STR-OBJECT_ID sy-vline 
WA_MCHPVS_STR-DOC_TYPE sy-vline 
WA_MCHPVS_STR-AUFNR sy-vline 
WA_MCHPVS_STR-AUART sy-vline 
WA_MCHPVS_STR-AUFTEXT sy-vline 
WA_MCHPVS_STR-PLOS sy-vline 
WA_MCHPVS_STR-ART sy-vline 
WA_MCHPVS_STR-HERKUNFT sy-vline 
WA_MCHPVS_STR-CRID sy-vline 
WA_MCHPVS_STR-ADRES sy-vline 
WA_MCHPVS_STR-CONNTXT sy-vline 
WA_MCHPVS_STR-ARCH_USER sy-vline 
WA_MCHPVS_STR-USER_NAM_FIRST sy-vline 
WA_MCHPVS_STR-USER_NAM_LAST sy-vline 
WA_MCHPVS_STR-ARCH_DATE sy-vline 
WA_MCHPVS_STR-ARCH_TIME sy-vline 
WA_MCHPVS_STR-EBRCOVERID sy-vline 
WA_MCHPVS_STR-EBRCOVERTXT sy-vline 
WA_MCHPVS_STR-PHSEQ sy-vline 
WA_MCHPVS_STR-HTML_MODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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