ABAP Select data from SAP table MDG_GN_TABL_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_TABL_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_TABL_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_TABL_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_TABL_SOURCE TYPE STANDARD TABLE OF MDG_GN_TABL_SOURCE,
      WA_MDG_GN_TABL_SOURCE TYPE MDG_GN_TABL_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_TABL_SOURCE> TYPE MDG_GN_TABL_SOURCE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDG_GN_TABL_SOURCE
*  INTO TABLE @DATA(IT_MDG_GN_TABL_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_TABL_SOURCE INDEX 1 INTO DATA(WA_MDG_GN_TABL_SOURCE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDG_GN_TABL_SOURCE>-TECH_SETTINGS = 1.
<MDG_GN_TABL_SOURCE>-TABNAME = 1.
<MDG_GN_TABL_SOURCE>-AS4LOCAL = 1.
<MDG_GN_TABL_SOURCE>-AS4VERS = 1.
<MDG_GN_TABL_SOURCE>-TABKAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDG_GN_TABL_SOURCE-TABART, sy-vline,
  WA_MDG_GN_TABL_SOURCE-PUFFERUNG, sy-vline,
  WA_MDG_GN_TABL_SOURCE-SCHFELDANZ, sy-vline,
  WA_MDG_GN_TABL_SOURCE-PROTOKOLL, sy-vline,
  WA_MDG_GN_TABL_SOURCE-SPEICHPUFF, sy-vline,
  WA_MDG_GN_TABL_SOURCE-AS4USER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDG_GN_TABL_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_TABL_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_TABL_SOURCE INTO WA_MDG_GN_TABL_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_TABL_SOURCE-DDLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDG_GN_TABL_SOURCE-DDLANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field MASTERLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MDG_GN_TABL_SOURCE-MASTERLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDG_GN_TABL_SOURCE-MASTERLANG.
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_TABL_SOURCE_STR, 
TECH_SETTINGS TYPE STRING,
TABNAME TYPE STRING,
AS4LOCAL TYPE STRING,
AS4VERS TYPE STRING,
TABKAT TYPE STRING,
TABART TYPE STRING,
PUFFERUNG TYPE STRING,
SCHFELDANZ TYPE STRING,
PROTOKOLL TYPE STRING,
SPEICHPUFF TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
TRANSPFLAG TYPE STRING,
RESERVE TYPE STRING,
UEBERSETZ TYPE STRING,
ACTFLAG TYPE STRING,
BUFALLOW TYPE STRING,
JAVAONLY TYPE STRING,
ROWORCOLST TYPE STRING,
SHARINGTYPE TYPE STRING,
LOAD_UNIT TYPE STRING,
TECH_SETTINGS_CHANGED TYPE STRING,
HEADER TYPE STRING,
TABNAME TYPE STRING,
DDLANGUAGE TYPE STRING,
TABCLASS TYPE STRING,
SQLTAB TYPE STRING,
DATMIN TYPE STRING,
DATMAX TYPE STRING,
DATAVG TYPE STRING,
CLIDEP TYPE STRING,
BUFFERED TYPE STRING,
COMPRFLAG TYPE STRING,
LANGDEP TYPE STRING,
DDTEXT TYPE STRING,
ACTFLAG TYPE STRING,
APPLCLASS TYPE STRING,
AUTHCLASS TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
MASTERLANG TYPE STRING,
MAINFLAG TYPE STRING,
CONTFLAG TYPE STRING,
RESERVETAB TYPE STRING,
GLOBALFLAG TYPE STRING,
PROZPUFF TYPE STRING,
VIEWCLASS TYPE STRING,
VIEWGRANT TYPE STRING,
MULTIPLEX TYPE STRING,
SHLPEXI TYPE STRING,
PROXYTYPE TYPE STRING,
EXCLASS TYPE STRING,
WRONGCL TYPE STRING,
ALWAYSTRP TYPE STRING,
ALLDATAINCL TYPE STRING,
WITH_PARAMETERS TYPE STRING,
EXVIEW_INCLUDED TYPE STRING,
KEYMAX_FEATURE TYPE STRING,
KEYLEN_FEATURE TYPE STRING,
TABLEN_FEATURE TYPE STRING,
NONTRP_INCLUDED TYPE STRING,
VIEWREF TYPE STRING,
VIEWREF_ERR TYPE STRING,
VIEWREF_POS_CHG TYPE STRING,
TBFUNC_INCLUDED TYPE STRING,
IS_GTT TYPE STRING,
SESSION_VAR_EX TYPE STRING,
FROM_ENTITY TYPE STRING,
PK_IS_INVHASH TYPE STRING,
USED_SESSION_VARS TYPE STRING,
HDB_ONLY_ENTITY_INCLUDED TYPE STRING,
FIELD_SUFFIX TYPE STRING,
QUOTA_MAX_FIELDS TYPE STRING,
QUOTA_MAX_BYTES TYPE STRING,
QUOTA_SHARE_PARTNER TYPE STRING,
QUOTA_SHARE_CUSTOMER TYPE STRING,
HEADER_CHANGED TYPE STRING,
T_FIELDS TYPE STRING,
FIELDS_CHANGED TYPE STRING,
T_FORKEYS TYPE STRING,
FORKEYS_CHANGED TYPE STRING,
T_FORKEY_FIELDS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDG_GN_TABL_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_TABL_SOURCE_STR-TECH_SETTINGS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TABNAME sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4LOCAL sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4VERS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TABKAT sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TABART sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-PUFFERUNG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-SCHFELDANZ sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-PROTOKOLL sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-SPEICHPUFF sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4USER sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4DATE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4TIME sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TRANSPFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-RESERVE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-UEBERSETZ sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-ACTFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-BUFALLOW sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-JAVAONLY sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-ROWORCOLST sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-SHARINGTYPE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-LOAD_UNIT sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TECH_SETTINGS_CHANGED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-HEADER sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TABNAME sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-DDLANGUAGE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TABCLASS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-SQLTAB sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-DATMIN sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-DATMAX sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-DATAVG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-CLIDEP sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-BUFFERED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-COMPRFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-LANGDEP sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-DDTEXT sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-ACTFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-APPLCLASS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AUTHCLASS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4USER sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4DATE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-AS4TIME sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-MASTERLANG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-MAINFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-CONTFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-RESERVETAB sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-GLOBALFLAG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-PROZPUFF sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-VIEWCLASS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-VIEWGRANT sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-MULTIPLEX sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-SHLPEXI sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-PROXYTYPE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-EXCLASS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-WRONGCL sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-ALWAYSTRP sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-ALLDATAINCL sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-WITH_PARAMETERS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-EXVIEW_INCLUDED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-KEYMAX_FEATURE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-KEYLEN_FEATURE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TABLEN_FEATURE sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-NONTRP_INCLUDED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-VIEWREF sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-VIEWREF_ERR sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-VIEWREF_POS_CHG sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-TBFUNC_INCLUDED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-IS_GTT sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-SESSION_VAR_EX sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-FROM_ENTITY sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-PK_IS_INVHASH sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-USED_SESSION_VARS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-HDB_ONLY_ENTITY_INCLUDED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-FIELD_SUFFIX sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-QUOTA_MAX_FIELDS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-QUOTA_MAX_BYTES sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-QUOTA_SHARE_PARTNER sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-QUOTA_SHARE_CUSTOMER sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-HEADER_CHANGED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-T_FIELDS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-FIELDS_CHANGED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-T_FORKEYS sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-FORKEYS_CHANGED sy-vline 
WA_MDG_GN_TABL_SOURCE_STR-T_FORKEY_FIELDS sy-vline      INTO ld_text SEPARATED BY SPACE.

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