ABAP Select data from SAP table MMPRC_HUB_MSGS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MMPRC_HUB_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 MMPRC_HUB_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 MMPRC_HUB_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_MMPRC_HUB_MSGS TYPE STANDARD TABLE OF MMPRC_HUB_MSGS,
      WA_MMPRC_HUB_MSGS TYPE MMPRC_HUB_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: <MMPRC_HUB_MSGS> TYPE MMPRC_HUB_MSGS.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMPRC_HUB_MSGS
*  INTO TABLE @DATA(IT_MMPRC_HUB_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_MMPRC_HUB_MSGS INDEX 1 INTO DATA(WA_MMPRC_HUB_MSGS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMPRC_HUB_MSGS>-MANDT = 1.
<MMPRC_HUB_MSGS>-MESSAGE_SEQNUMBER = 1.
<MMPRC_HUB_MSGS>-RESPONSEMESSAGEGUID = 1.
<MMPRC_HUB_MSGS>-PURCHASINGDOCUMENT = 1.
<MMPRC_HUB_MSGS>-PURCHASINGDOCUMENTCATEGORY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMPRC_HUB_MSGS-EXTCONTRACTFORPURG, sy-vline,
  WA_MMPRC_HUB_MSGS-LOGICALSYSTEM, sy-vline,
  WA_MMPRC_HUB_MSGS-MESSAGETYPE, sy-vline,
  WA_MMPRC_HUB_MSGS-MESSAGEIDENTIFICATION, sy-vline,
  WA_MMPRC_HUB_MSGS-MESSAGENUMBER, sy-vline,
  WA_MMPRC_HUB_MSGS-PARAMETERNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMPRC_HUB_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_MMPRC_HUB_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_MMPRC_HUB_MSGS INTO WA_MMPRC_HUB_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 PURCHASINGDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPRC_HUB_MSGS-PURCHASINGDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPRC_HUB_MSGS-PURCHASINGDOCUMENT.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field LOGICALSYSTEM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMPRC_HUB_MSGS-LOGICALSYSTEM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMPRC_HUB_MSGS-LOGICALSYSTEM.
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_MMPRC_HUB_MSGS_STR, 
MANDT TYPE STRING,
MESSAGE_SEQNUMBER TYPE STRING,
RESPONSEMESSAGEGUID TYPE STRING,
PURCHASINGDOCUMENT TYPE STRING,
PURCHASINGDOCUMENTCATEGORY TYPE STRING,
EXTCONTRACTFORPURG TYPE STRING,
LOGICALSYSTEM TYPE STRING,
MESSAGETYPE TYPE STRING,
MESSAGEIDENTIFICATION TYPE STRING,
MESSAGENUMBER TYPE STRING,
PARAMETERNAME TYPE STRING,
PARAMETERLINE TYPE STRING,
MESSAGEVARIABLE1 TYPE STRING,
MESSAGEVARIABLE2 TYPE STRING,
MESSAGEVARIABLE3 TYPE STRING,
MESSAGEVARIABLE4 TYPE STRING,
MESSAGETEXT TYPE STRING,
RESP_RECD_AT TYPE STRING,
EXTCONTRACTITEMFORPURG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMPRC_HUB_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_MMPRC_HUB_MSGS_STR-MANDT sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGE_SEQNUMBER sy-vline 
WA_MMPRC_HUB_MSGS_STR-RESPONSEMESSAGEGUID sy-vline 
WA_MMPRC_HUB_MSGS_STR-PURCHASINGDOCUMENT sy-vline 
WA_MMPRC_HUB_MSGS_STR-PURCHASINGDOCUMENTCATEGORY sy-vline 
WA_MMPRC_HUB_MSGS_STR-EXTCONTRACTFORPURG sy-vline 
WA_MMPRC_HUB_MSGS_STR-LOGICALSYSTEM sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGETYPE sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGEIDENTIFICATION sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGENUMBER sy-vline 
WA_MMPRC_HUB_MSGS_STR-PARAMETERNAME sy-vline 
WA_MMPRC_HUB_MSGS_STR-PARAMETERLINE sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGEVARIABLE1 sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGEVARIABLE2 sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGEVARIABLE3 sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGEVARIABLE4 sy-vline 
WA_MMPRC_HUB_MSGS_STR-MESSAGETEXT sy-vline 
WA_MMPRC_HUB_MSGS_STR-RESP_RECD_AT sy-vline 
WA_MMPRC_HUB_MSGS_STR-EXTCONTRACTITEMFORPURG sy-vline      INTO ld_text SEPARATED BY SPACE.

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