ABAP Select data from SAP table MMSES_CHANGE_FROM_EXTERNAL into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MMSES_CHANGE_FROM_EXTERNAL
*  INTO TABLE @DATA(IT_MMSES_CHANGE_FROM_EXTERNAL2).
*--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_MMSES_CHANGE_FROM_EXTERNAL INDEX 1 INTO DATA(WA_MMSES_CHANGE_FROM_EXTERNAL2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MMSES_CHANGE_FROM_EXTERNAL>-SKIP_AUTHORITY_CHECKS = 1.
<MMSES_CHANGE_FROM_EXTERNAL>-HEADER = 1.
<MMSES_CHANGE_FROM_EXTERNAL>-KEY = 1.
<MMSES_CHANGE_FROM_EXTERNAL>-SERVICEENTRYSHEET = 1.
<MMSES_CHANGE_FROM_EXTERNAL>-SERVICEENTRYSHEETNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MMSES_CHANGE_FROM_EXTERNAL-SUPPLIER, sy-vline,
  WA_MMSES_CHANGE_FROM_EXTERNAL-PURCHASEORDER, sy-vline,
  WA_MMSES_CHANGE_FROM_EXTERNAL-ISDELETED, sy-vline,
  WA_MMSES_CHANGE_FROM_EXTERNAL-APPROVALSTATUS, sy-vline,
  WA_MMSES_CHANGE_FROM_EXTERNAL-APPROVALDATETIME, sy-vline,
  WA_MMSES_CHANGE_FROM_EXTERNAL-RESPONSIBLEPERSON, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MMSES_CHANGE_FROM_EXTERNAL 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_MMSES_CHANGE_FROM_EXTERNAL 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_MMSES_CHANGE_FROM_EXTERNAL INTO WA_MMSES_CHANGE_FROM_EXTERNAL.


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

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

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

*Conversion exit ALPHA, internal->external for field SERVICEENTRYSHEET
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MMSES_CHANGE_FROM_EXTERNAL-SERVICEENTRYSHEET
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MMSES_CHANGE_FROM_EXTERNAL-SERVICEENTRYSHEET.
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_MMSES_CHANGE_FROM_EXTERNAL_STR, 
SKIP_AUTHORITY_CHECKS TYPE STRING,
HEADER TYPE STRING,
KEY TYPE STRING,
SERVICEENTRYSHEET TYPE STRING,
SERVICEENTRYSHEETNAME TYPE STRING,
SUPPLIER TYPE STRING,
PURCHASEORDER TYPE STRING,
ISDELETED TYPE STRING,
APPROVALSTATUS TYPE STRING,
APPROVALDATETIME TYPE STRING,
RESPONSIBLEPERSON TYPE STRING,
ORIGINOBJECTTYPE TYPE STRING,
PURGDOCEXTERNALSYSTEM TYPE STRING,
PURGDOCEXTERNALREFERENCE TYPE STRING,
POSTINGDATE TYPE STRING,
CURRENCY TYPE STRING,
EXTERNALREVISIONDATETIME TYPE STRING,
CREATIONDATETIME TYPE STRING,
CREATEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
LASTCHANGEUSER TYPE STRING,
HEADERX TYPE STRING,
KEY TYPE STRING,
SERVICEENTRYSHEET TYPE STRING,
SERVICEENTRYSHEETNAME TYPE STRING,
SUPPLIER TYPE STRING,
PURCHASEORDER TYPE STRING,
ISDELETED TYPE STRING,
APPROVALSTATUS TYPE STRING,
APPROVALDATETIME TYPE STRING,
RESPONSIBLEPERSON TYPE STRING,
ORIGINOBJECTTYPE TYPE STRING,
PURGDOCEXTERNALSYSTEM TYPE STRING,
PURGDOCEXTERNALREFERENCE TYPE STRING,
POSTINGDATE TYPE STRING,
CURRENCY TYPE STRING,
EXTERNALREVISIONDATETIME TYPE STRING,
CREATIONDATETIME TYPE STRING,
CREATEDBYUSER TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
LASTCHANGEUSER TYPE STRING,
ITEM TYPE STRING,
ITEMX TYPE STRING,
ACCOUNT_ASSIGNMENT TYPE STRING,
ACCOUNT_ASSIGNMENTX TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MMSES_CHANGE_FROM_EXTERNAL_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_MMSES_CHANGE_FROM_EXTERNAL_STR-SKIP_AUTHORITY_CHECKS sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-HEADER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-KEY sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-SERVICEENTRYSHEET sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-SERVICEENTRYSHEETNAME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-SUPPLIER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-PURCHASEORDER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ISDELETED sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-APPROVALSTATUS sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-APPROVALDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-RESPONSIBLEPERSON sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ORIGINOBJECTTYPE sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-PURGDOCEXTERNALSYSTEM sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-PURGDOCEXTERNALREFERENCE sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-POSTINGDATE sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-CURRENCY sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-EXTERNALREVISIONDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-CREATIONDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-CREATEDBYUSER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-LASTCHANGEDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-LASTCHANGEUSER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-HEADERX sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-KEY sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-SERVICEENTRYSHEET sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-SERVICEENTRYSHEETNAME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-SUPPLIER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-PURCHASEORDER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ISDELETED sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-APPROVALSTATUS sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-APPROVALDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-RESPONSIBLEPERSON sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ORIGINOBJECTTYPE sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-PURGDOCEXTERNALSYSTEM sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-PURGDOCEXTERNALREFERENCE sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-POSTINGDATE sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-CURRENCY sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-EXTERNALREVISIONDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-CREATIONDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-CREATEDBYUSER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-LASTCHANGEDATETIME sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-LASTCHANGEUSER sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ITEM sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ITEMX sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ACCOUNT_ASSIGNMENT sy-vline 
WA_MMSES_CHANGE_FROM_EXTERNAL_STR-ACCOUNT_ASSIGNMENTX sy-vline      INTO ld_text SEPARATED BY SPACE.

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