ABAP Select data from SAP table MPO_TRAVEL_FIELDS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MPO_TRAVEL_FIELDS
*  INTO TABLE @DATA(IT_MPO_TRAVEL_FIELDS2).
*--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_MPO_TRAVEL_FIELDS INDEX 1 INTO DATA(WA_MPO_TRAVEL_FIELDS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MPO_TRAVEL_FIELDS>-KOKRS = 1.
<MPO_TRAVEL_FIELDS>-KOSTL = 1.
<MPO_TRAVEL_FIELDS>-KOSTL_TO = 1.
<MPO_TRAVEL_FIELDS>-KOSTL_SET = 1.
<MPO_TRAVEL_FIELDS>-KOSTL_SETX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MPO_TRAVEL_FIELDS-AUFNR, sy-vline,
  WA_MPO_TRAVEL_FIELDS-AUFNR_TO, sy-vline,
  WA_MPO_TRAVEL_FIELDS-AUFNR_SET, sy-vline,
  WA_MPO_TRAVEL_FIELDS-AUFNR_SETX, sy-vline,
  WA_MPO_TRAVEL_FIELDS-PSPID, sy-vline,
  WA_MPO_TRAVEL_FIELDS-PSPID_TO, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MPO_TRAVEL_FIELDS 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_MPO_TRAVEL_FIELDS 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_MPO_TRAVEL_FIELDS INTO WA_MPO_TRAVEL_FIELDS.


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

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

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

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

*Conversion exit ABPSN, internal->external for field PSPID
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_MPO_TRAVEL_FIELDS-PSPID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPO_TRAVEL_FIELDS-PSPID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ABPSN, internal->external for field PSPID_TO
CALL FUNCTION 'CONVERSION_EXIT_ABPSN_OUTPUT'
  EXPORTING
    input =                      WA_MPO_TRAVEL_FIELDS-PSPID_TO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MPO_TRAVEL_FIELDS-PSPID_TO.
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_MPO_TRAVEL_FIELDS_STR, 
KOKRS TYPE STRING,
KOSTL TYPE STRING,
KOSTL_TO TYPE STRING,
KOSTL_SET TYPE STRING,
KOSTL_SETX TYPE STRING,
AUFNR TYPE STRING,
AUFNR_TO TYPE STRING,
AUFNR_SET TYPE STRING,
AUFNR_SETX TYPE STRING,
PSPID TYPE STRING,
PSPID_TO TYPE STRING,
PSPID_SET TYPE STRING,
PSPID_SETX TYPE STRING,
LDBANTRG TYPE STRING,
LDBABREC TYPE STRING,
LDBUEBRF TYPE STRING,
LDBTO_FROM TYPE STRING,
LDBTO_TO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MPO_TRAVEL_FIELDS_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_MPO_TRAVEL_FIELDS_STR-KOKRS sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-KOSTL sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-KOSTL_TO sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-KOSTL_SET sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-KOSTL_SETX sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-AUFNR sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-AUFNR_TO sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-AUFNR_SET sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-AUFNR_SETX sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-PSPID sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-PSPID_TO sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-PSPID_SET sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-PSPID_SETX sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-LDBANTRG sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-LDBABREC sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-LDBUEBRF sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-LDBTO_FROM sy-vline 
WA_MPO_TRAVEL_FIELDS_STR-LDBTO_TO sy-vline      INTO ld_text SEPARATED BY SPACE.

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