ABAP Select data from SAP table MDG_GN_INDX_SOURCE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDG_GN_INDX_SOURCE
*  INTO TABLE @DATA(IT_MDG_GN_INDX_SOURCE2).
*--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_MDG_GN_INDX_SOURCE INDEX 1 INTO DATA(WA_MDG_GN_INDX_SOURCE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDG_GN_INDX_SOURCE>-HEADER = 1.
<MDG_GN_INDX_SOURCE>-SQLTAB = 1.
<MDG_GN_INDX_SOURCE>-INDEXNAME = 1.
<MDG_GN_INDX_SOURCE>-AS4LOCAL = 1.
<MDG_GN_INDX_SOURCE>-AS4VERS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDG_GN_INDX_SOURCE-DDLANGUAGE, sy-vline,
  WA_MDG_GN_INDX_SOURCE-AUTHCLASS, sy-vline,
  WA_MDG_GN_INDX_SOURCE-UNIQUEFLAG, sy-vline,
  WA_MDG_GN_INDX_SOURCE-AS4USER, sy-vline,
  WA_MDG_GN_INDX_SOURCE-AS4DATE, sy-vline,
  WA_MDG_GN_INDX_SOURCE-AS4TIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDG_GN_INDX_SOURCE 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_MDG_GN_INDX_SOURCE 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_MDG_GN_INDX_SOURCE INTO WA_MDG_GN_INDX_SOURCE.


*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 DDLANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MDG_GN_INDX_SOURCE-DDLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDG_GN_INDX_SOURCE-DDLANGUAGE.
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_MDG_GN_INDX_SOURCE_STR, 
HEADER TYPE STRING,
SQLTAB TYPE STRING,
INDEXNAME TYPE STRING,
AS4LOCAL TYPE STRING,
AS4VERS TYPE STRING,
DDLANGUAGE TYPE STRING,
AUTHCLASS TYPE STRING,
UNIQUEFLAG TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
ACTFLAG TYPE STRING,
DBINDEX TYPE STRING,
DBSTATE TYPE STRING,
DBINCLEXCL TYPE STRING,
DBSYSSEL1 TYPE STRING,
DBSYSSEL2 TYPE STRING,
DBSYSSEL3 TYPE STRING,
DBSYSSEL4 TYPE STRING,
DDTEXT TYPE STRING,
ISEXTIND TYPE STRING,
FULL_TEXT TYPE STRING,
LANGU_COLUMN TYPE STRING,
MIME_TYPE_COL TYPE STRING,
MIME_TYPE TYPE STRING,
LANGU_DETECTION TYPE STRING,
FAST_PREPROCESS TYPE STRING,
FUZZY_SEARCH_INDX TYPE STRING,
SEARCH_ONLY TYPE STRING,
UPDATE_MODE TYPE STRING,
CONFIGURATION TYPE STRING,
PHRASE_INDX_RATIO TYPE STRING,
TEXT_ANALYSIS TYPE STRING,
TOKEN_SEPARATORS TYPE STRING,
HEADER_CHANGED TYPE STRING,
T_FIELDS TYPE STRING,
FIELDS_CHANGED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDG_GN_INDX_SOURCE_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_MDG_GN_INDX_SOURCE_STR-HEADER sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-SQLTAB sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-INDEXNAME sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-AS4LOCAL sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-AS4VERS sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DDLANGUAGE sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-AUTHCLASS sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-UNIQUEFLAG sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-AS4USER sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-AS4DATE sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-AS4TIME sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-ACTFLAG sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBINDEX sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBSTATE sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBINCLEXCL sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBSYSSEL1 sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBSYSSEL2 sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBSYSSEL3 sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DBSYSSEL4 sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-DDTEXT sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-ISEXTIND sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-FULL_TEXT sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-LANGU_COLUMN sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-MIME_TYPE_COL sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-MIME_TYPE sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-LANGU_DETECTION sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-FAST_PREPROCESS sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-FUZZY_SEARCH_INDX sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-SEARCH_ONLY sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-UPDATE_MODE sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-CONFIGURATION sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-PHRASE_INDX_RATIO sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-TEXT_ANALYSIS sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-TOKEN_SEPARATORS sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-HEADER_CHANGED sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-T_FIELDS sy-vline 
WA_MDG_GN_INDX_SOURCE_STR-FIELDS_CHANGED sy-vline      INTO ld_text SEPARATED BY SPACE.

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