ABAP Select data from SAP table MMPUR_CPR_MSGS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPUR_CPR_MSGS
*  INTO TABLE @DATA(IT_MMPUR_CPR_MSGS2).
*--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_MMPUR_CPR_MSGS INDEX 1 INTO DATA(WA_MMPUR_CPR_MSGS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPUR_CPR_MSGS>-MANDT = 1.
<MMPUR_CPR_MSGS>-PURCHASEREQUISITION = 1.
<MMPUR_CPR_MSGS>-PURCHASEREQUISITIONITEM = 1.
<MMPUR_CPR_MSGS>-SEQUENCENUMBER = 1.
<MMPUR_CPR_MSGS>-MESSAGETYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPUR_CPR_MSGS-MESSAGEID, sy-vline,
  WA_MMPUR_CPR_MSGS-MESSAGENO, sy-vline,
  WA_MMPUR_CPR_MSGS-MESSAGEVARIABLE1, sy-vline,
  WA_MMPUR_CPR_MSGS-MESSAGEVARIABLE2, sy-vline,
  WA_MMPUR_CPR_MSGS-MESSAGEVARIABLE3, sy-vline,
  WA_MMPUR_CPR_MSGS-MESSAGEVARIABLE4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPUR_CPR_MSGS 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_MMPUR_CPR_MSGS 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_MMPUR_CPR_MSGS INTO WA_MMPUR_CPR_MSGS.


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

*Conversion exit ALPHA, internal->external for field EXTPURCHASEREQUISITION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPUR_CPR_MSGS-EXTPURCHASEREQUISITION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPUR_CPR_MSGS-EXTPURCHASEREQUISITION.
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_MMPUR_CPR_MSGS_STR, 
MANDT TYPE STRING,
PURCHASEREQUISITION TYPE STRING,
PURCHASEREQUISITIONITEM TYPE STRING,
SEQUENCENUMBER TYPE STRING,
MESSAGETYPE TYPE STRING,
MESSAGEID TYPE STRING,
MESSAGENO TYPE STRING,
MESSAGEVARIABLE1 TYPE STRING,
MESSAGEVARIABLE2 TYPE STRING,
MESSAGEVARIABLE3 TYPE STRING,
MESSAGEVARIABLE4 TYPE STRING,
MESSAGETEXT TYPE STRING,
REQUISITIONERRORTIMESTAMP TYPE STRING,
EXTPURCHASEREQUISITION TYPE STRING,
EXTPURCHASEREQUISITIONITEM TYPE STRING,
EXTERNALSYSTEMID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPUR_CPR_MSGS_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_MMPUR_CPR_MSGS_STR-MANDT sy-vline 
WA_MMPUR_CPR_MSGS_STR-PURCHASEREQUISITION sy-vline 
WA_MMPUR_CPR_MSGS_STR-PURCHASEREQUISITIONITEM sy-vline 
WA_MMPUR_CPR_MSGS_STR-SEQUENCENUMBER sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGETYPE sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGEID sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGENO sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGEVARIABLE1 sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGEVARIABLE2 sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGEVARIABLE3 sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGEVARIABLE4 sy-vline 
WA_MMPUR_CPR_MSGS_STR-MESSAGETEXT sy-vline 
WA_MMPUR_CPR_MSGS_STR-REQUISITIONERRORTIMESTAMP sy-vline 
WA_MMPUR_CPR_MSGS_STR-EXTPURCHASEREQUISITION sy-vline 
WA_MMPUR_CPR_MSGS_STR-EXTPURCHASEREQUISITIONITEM sy-vline 
WA_MMPUR_CPR_MSGS_STR-EXTERNALSYSTEMID sy-vline      INTO ld_text SEPARATED BY SPACE.

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