ABAP Select data from SAP table MLGT_SRC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MLGT_SRC
*  INTO TABLE @DATA(IT_MLGT_SRC2).
*--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_MLGT_SRC INDEX 1 INTO DATA(WA_MLGT_SRC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MLGT_SRC>-CLIENT = 1.
<MLGT_SRC>-SOURCE_SYSTEM = 1.
<MLGT_SRC>-SOURCE_ID = 1.
<MLGT_SRC>-LGNUM = 1.
<MLGT_SRC>-LGTYP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MLGT_SRC-LVORM, sy-vline,
  WA_MLGT_SRC-LGPLA, sy-vline,
  WA_MLGT_SRC-LPMAX, sy-vline,
  WA_MLGT_SRC-LPMIN, sy-vline,
  WA_MLGT_SRC-MAMNG, sy-vline,
  WA_MLGT_SRC-NSMNG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MLGT_SRC 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_MLGT_SRC 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_MLGT_SRC INTO WA_MLGT_SRC.


*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_MLGT_SRC_STR, 
CLIENT TYPE STRING,
SOURCE_SYSTEM TYPE STRING,
SOURCE_ID TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
LVORM TYPE STRING,
LGPLA TYPE STRING,
LPMAX TYPE STRING,
LPMIN TYPE STRING,
MAMNG TYPE STRING,
NSMNG TYPE STRING,
KOBER TYPE STRING,
RDMNG TYPE STRING,
SOURCE_RECENCY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MLGT_SRC_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_MLGT_SRC_STR-CLIENT sy-vline 
WA_MLGT_SRC_STR-SOURCE_SYSTEM sy-vline 
WA_MLGT_SRC_STR-SOURCE_ID sy-vline 
WA_MLGT_SRC_STR-LGNUM sy-vline 
WA_MLGT_SRC_STR-LGTYP sy-vline 
WA_MLGT_SRC_STR-LVORM sy-vline 
WA_MLGT_SRC_STR-LGPLA sy-vline 
WA_MLGT_SRC_STR-LPMAX sy-vline 
WA_MLGT_SRC_STR-LPMIN sy-vline 
WA_MLGT_SRC_STR-MAMNG sy-vline 
WA_MLGT_SRC_STR-NSMNG sy-vline 
WA_MLGT_SRC_STR-KOBER sy-vline 
WA_MLGT_SRC_STR-RDMNG sy-vline 
WA_MLGT_SRC_STR-SOURCE_RECENCY sy-vline      INTO ld_text SEPARATED BY SPACE.

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