ABAP Select data from SAP table UPWB_MDATA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM UPWB_MDATA
*  INTO TABLE @DATA(IT_UPWB_MDATA2).
*--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_UPWB_MDATA INDEX 1 INTO DATA(WA_UPWB_MDATA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<UPWB_MDATA>-PLANAPP = 1.
<UPWB_MDATA>-APPLCLAS = 1.
<UPWB_MDATA>-AUTHOR = 1.
<UPWB_MDATA>-CREATEDON = 1.
<UPWB_MDATA>-CHANGEDBY = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_UPWB_MDATA-CHANGEDON, sy-vline,
  WA_UPWB_MDATA-DEVCLASS, sy-vline,
  WA_UPWB_MDATA-ORIGLANG, sy-vline,
  WA_UPWB_MDATA-MODIFLANG, sy-vline,
  WA_UPWB_MDATA-LENGTH, sy-vline,
  WA_UPWB_MDATA-RUNTIMELENGTH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_UPWB_MDATA 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_UPWB_MDATA 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_UPWB_MDATA INTO WA_UPWB_MDATA.


*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 ISOLA, internal->external for field ORIGLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_UPWB_MDATA-ORIGLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPWB_MDATA-ORIGLANG.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field MODIFLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_UPWB_MDATA-MODIFLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_UPWB_MDATA-MODIFLANG.
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_UPWB_MDATA_STR, 
PLANAPP TYPE STRING,
APPLCLAS TYPE STRING,
AUTHOR TYPE STRING,
CREATEDON TYPE STRING,
CHANGEDBY TYPE STRING,
CHANGEDON TYPE STRING,
DEVCLASS TYPE STRING,
ORIGLANG TYPE STRING,
MODIFLANG TYPE STRING,
LENGTH TYPE STRING,
RUNTIMELENGTH TYPE STRING,
MEMORY_LENGTH TYPE STRING,END OF T_EKKO_STR.
DATA: WA_UPWB_MDATA_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_UPWB_MDATA_STR-PLANAPP sy-vline 
WA_UPWB_MDATA_STR-APPLCLAS sy-vline 
WA_UPWB_MDATA_STR-AUTHOR sy-vline 
WA_UPWB_MDATA_STR-CREATEDON sy-vline 
WA_UPWB_MDATA_STR-CHANGEDBY sy-vline 
WA_UPWB_MDATA_STR-CHANGEDON sy-vline 
WA_UPWB_MDATA_STR-DEVCLASS sy-vline 
WA_UPWB_MDATA_STR-ORIGLANG sy-vline 
WA_UPWB_MDATA_STR-MODIFLANG sy-vline 
WA_UPWB_MDATA_STR-LENGTH sy-vline 
WA_UPWB_MDATA_STR-RUNTIMELENGTH sy-vline 
WA_UPWB_MDATA_STR-MEMORY_LENGTH sy-vline      INTO ld_text SEPARATED BY SPACE.

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