ABAP Select data from SAP table UMM_LN101 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP UMM_LN101 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 UMM_LN101. 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 UMM_LN101 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_UMM_LN101 TYPE STANDARD TABLE OF UMM_LN101,
      WA_UMM_LN101 TYPE UMM_LN101,
      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: <UMM_LN101> TYPE UMM_LN101.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_UMM_LN101.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM UMM_LN101
  INTO TABLE IT_UMM_LN101.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM UMM_LN101
*  INTO TABLE @DATA(IT_UMM_LN1012).
*--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_UMM_LN101 INDEX 1 INTO DATA(WA_UMM_LN1012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_UMM_LN101 ASSIGNING <UMM_LN101>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<UMM_LN101>-MANDT = 1.
<UMM_LN101>-OBJTYPE = 1.
<UMM_LN101>-OBJNAME = 1.
<UMM_LN101>-LINKTYPE = 1.
<UMM_LN101>-SQNR = 1.

ENDLOOP.

LOOP AT IT_UMM_LN101 INTO WA_UMM_LN101.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_UMM_LN101-GUID_25, sy-vline,
  WA_UMM_LN101-RFCDEST, sy-vline,
  WA_UMM_LN101-WBID, sy-vline,
  WA_UMM_LN101-PAGEID, sy-vline,
  WA_UMM_LN101-WEBTMPL, sy-vline,
  WA_UMM_LN101-URL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_UMM_LN101 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_UMM_LN101 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_UMM_LN101 INTO WA_UMM_LN101.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_UMM_LN101_STR, 
MANDT TYPE STRING,
OBJTYPE TYPE STRING,
OBJNAME TYPE STRING,
LINKTYPE TYPE STRING,
SQNR TYPE STRING,
GUID_25 TYPE STRING,
RFCDEST TYPE STRING,
WBID TYPE STRING,
PAGEID TYPE STRING,
WEBTMPL TYPE STRING,
URL TYPE STRING,
ISWORKBOOK TYPE STRING,
GENUNIID TYPE STRING,
COMPUID TYPE STRING,
IQUERY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_UMM_LN101_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_UMM_LN101_STR-MANDT sy-vline 
WA_UMM_LN101_STR-OBJTYPE sy-vline 
WA_UMM_LN101_STR-OBJNAME sy-vline 
WA_UMM_LN101_STR-LINKTYPE sy-vline 
WA_UMM_LN101_STR-SQNR sy-vline 
WA_UMM_LN101_STR-GUID_25 sy-vline 
WA_UMM_LN101_STR-RFCDEST sy-vline 
WA_UMM_LN101_STR-WBID sy-vline 
WA_UMM_LN101_STR-PAGEID sy-vline 
WA_UMM_LN101_STR-WEBTMPL sy-vline 
WA_UMM_LN101_STR-URL sy-vline 
WA_UMM_LN101_STR-ISWORKBOOK sy-vline 
WA_UMM_LN101_STR-GENUNIID sy-vline 
WA_UMM_LN101_STR-COMPUID sy-vline 
WA_UMM_LN101_STR-IQUERY sy-vline      INTO ld_text SEPARATED BY SPACE.

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