ABAP Select data from SAP table DTYPINFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DTYPINFO
*  INTO TABLE @DATA(IT_DTYPINFO2).
*--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_DTYPINFO INDEX 1 INTO DATA(WA_DTYPINFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DTYPINFO>-FIELDTYPE = 1.
<DTYPINFO>-ABTYPE = 1.
<DTYPINFO>-DTYP = 1.
<DTYPINFO>-EXID = 1.
<DTYPINFO>-DBLENGTH = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DTYPINFO-DBLENGTH2, sy-vline,
  WA_DTYPINFO-DECIMALS, sy-vline,
  WA_DTYPINFO-DIGITS, sy-vline,
  WA_DTYPINFO-EXLENGTH, sy-vline,
  WA_DTYPINFO-CONVEXIT, sy-vline,
  WA_DTYPINFO-MEMORYID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DTYPINFO 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_DTYPINFO 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_DTYPINFO INTO WA_DTYPINFO.


*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 DTYPE, internal->external for field DTYP
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_DTYPINFO-DTYP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_DTYPINFO-DTYP.
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_DTYPINFO_STR, 
FIELDTYPE TYPE STRING,
ABTYPE TYPE STRING,
DTYP TYPE STRING,
EXID TYPE STRING,
DBLENGTH TYPE STRING,
DBLENGTH2 TYPE STRING,
DECIMALS TYPE STRING,
DIGITS TYPE STRING,
EXLENGTH TYPE STRING,
CONVEXIT TYPE STRING,
MEMORYID TYPE STRING,
SIGN TYPE STRING,
LOWERCASE TYPE STRING,
VALEXI TYPE STRING,
LOGFLAG TYPE STRING,
CONVEXFLG TYPE STRING,
PARAMID TYPE STRING,
DIGITFLG TYPE STRING,
SHLPEX TYPE STRING,
F4AVAILABL TYPE STRING,
LTRFLDDIS TYPE STRING,
BIDICTRLC TYPE STRING,
NOHISTORY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DTYPINFO_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_DTYPINFO_STR-FIELDTYPE sy-vline 
WA_DTYPINFO_STR-ABTYPE sy-vline 
WA_DTYPINFO_STR-DTYP sy-vline 
WA_DTYPINFO_STR-EXID sy-vline 
WA_DTYPINFO_STR-DBLENGTH sy-vline 
WA_DTYPINFO_STR-DBLENGTH2 sy-vline 
WA_DTYPINFO_STR-DECIMALS sy-vline 
WA_DTYPINFO_STR-DIGITS sy-vline 
WA_DTYPINFO_STR-EXLENGTH sy-vline 
WA_DTYPINFO_STR-CONVEXIT sy-vline 
WA_DTYPINFO_STR-MEMORYID sy-vline 
WA_DTYPINFO_STR-SIGN sy-vline 
WA_DTYPINFO_STR-LOWERCASE sy-vline 
WA_DTYPINFO_STR-VALEXI sy-vline 
WA_DTYPINFO_STR-LOGFLAG sy-vline 
WA_DTYPINFO_STR-CONVEXFLG sy-vline 
WA_DTYPINFO_STR-PARAMID sy-vline 
WA_DTYPINFO_STR-DIGITFLG sy-vline 
WA_DTYPINFO_STR-SHLPEX sy-vline 
WA_DTYPINFO_STR-F4AVAILABL sy-vline 
WA_DTYPINFO_STR-LTRFLDDIS sy-vline 
WA_DTYPINFO_STR-BIDICTRLC sy-vline 
WA_DTYPINFO_STR-NOHISTORY sy-vline      INTO ld_text SEPARATED BY SPACE.

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