ABAP Select data from SAP table MDG_GN_TTYP_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_TTYP_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_TTYP_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_TTYP_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_TTYP_SOURCE TYPE STANDARD TABLE OF MDG_GN_TTYP_SOURCE,
      WA_MDG_GN_TTYP_SOURCE TYPE MDG_GN_TTYP_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_TTYP_SOURCE> TYPE MDG_GN_TTYP_SOURCE.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDG_GN_TTYP_SOURCE
*  INTO TABLE @DATA(IT_MDG_GN_TTYP_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_TTYP_SOURCE INDEX 1 INTO DATA(WA_MDG_GN_TTYP_SOURCE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDG_GN_TTYP_SOURCE>-HEADER = 1.
<MDG_GN_TTYP_SOURCE>-TYPENAME = 1.
<MDG_GN_TTYP_SOURCE>-DDLANGUAGE = 1.
<MDG_GN_TTYP_SOURCE>-ROWTYPE = 1.
<MDG_GN_TTYP_SOURCE>-ROWKIND = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDG_GN_TTYP_SOURCE-DATATYPE, sy-vline,
  WA_MDG_GN_TTYP_SOURCE-LENG, sy-vline,
  WA_MDG_GN_TTYP_SOURCE-DECIMALS, sy-vline,
  WA_MDG_GN_TTYP_SOURCE-ACCESSMODE, sy-vline,
  WA_MDG_GN_TTYP_SOURCE-KEYDEF, sy-vline,
  WA_MDG_GN_TTYP_SOURCE-KEYKIND, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDG_GN_TTYP_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_TTYP_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_TTYP_SOURCE INTO WA_MDG_GN_TTYP_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_TTYP_SOURCE-DDLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDG_GN_TTYP_SOURCE-DDLANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_MDG_GN_TTYP_SOURCE-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDG_GN_TTYP_SOURCE-DATATYPE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit DTYPE, internal->external for field CTDATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_MDG_GN_TTYP_SOURCE-CTDATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDG_GN_TTYP_SOURCE-CTDATATYPE.
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_TTYP_SOURCE_STR, 
HEADER TYPE STRING,
TYPENAME TYPE STRING,
DDLANGUAGE TYPE STRING,
ROWTYPE TYPE STRING,
ROWKIND TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
ACCESSMODE TYPE STRING,
KEYDEF TYPE STRING,
KEYKIND TYPE STRING,
KEYFDCOUNT TYPE STRING,
GENERIC TYPE STRING,
AS4USER TYPE STRING,
AS4DATE TYPE STRING,
AS4TIME TYPE STRING,
DDTEXT TYPE STRING,
TYPELEN TYPE STRING,
ACTFLAG TYPE STRING,
TTYPKIND TYPE STRING,
RANGE_CTYP TYPE STRING,
CTDATATYPE TYPE STRING,
CTLENG TYPE STRING,
CTDECIMALS TYPE STRING,
REFTYPE TYPE STRING,
OCCURS TYPE STRING,
PROXYTYPE TYPE STRING,
ALIAS TYPE STRING,
FURTHERSECKEY TYPE STRING,
HEADER_CHANGED TYPE STRING,
T_KEY TYPE STRING,
T_KEY_CHANGED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDG_GN_TTYP_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_TTYP_SOURCE_STR-HEADER sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-TYPENAME sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-DDLANGUAGE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-ROWTYPE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-ROWKIND sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-DATATYPE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-LENG sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-DECIMALS sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-ACCESSMODE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-KEYDEF sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-KEYKIND sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-KEYFDCOUNT sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-GENERIC sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-AS4USER sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-AS4DATE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-AS4TIME sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-DDTEXT sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-TYPELEN sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-ACTFLAG sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-TTYPKIND sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-RANGE_CTYP sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-CTDATATYPE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-CTLENG sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-CTDECIMALS sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-REFTYPE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-OCCURS sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-PROXYTYPE sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-ALIAS sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-FURTHERSECKEY sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-HEADER_CHANGED sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-T_KEY sy-vline 
WA_MDG_GN_TTYP_SOURCE_STR-T_KEY_CHANGED sy-vline      INTO ld_text SEPARATED BY SPACE.

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