ABAP Select data from SAP table SQLTDDINFO into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM SQLTDDINFO
*  INTO TABLE @DATA(IT_SQLTDDINFO2).
*--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_SQLTDDINFO INDEX 1 INTO DATA(WA_SQLTDDINFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<SQLTDDINFO>-TABNAME = 1.
<SQLTDDINFO>-SQLTAB = 1.
<SQLTDDINFO>-TABCLASS = 1.
<SQLTDDINFO>-SQLCLASS = 1.
<SQLTDDINFO>-TABARTT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_SQLTDDINFO-TABKATT, sy-vline,
  WA_SQLTDDINFO-BUFALLOT, sy-vline,
  WA_SQLTDDINFO-BUFFERMOD, sy-vline,
  WA_SQLTDDINFO-SCHFELDANZ, sy-vline,
  WA_SQLTDDINFO-DDTEXT, sy-vline,
  WA_SQLTDDINFO-MCTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_SQLTDDINFO 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_SQLTDDINFO 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_SQLTDDINFO INTO WA_SQLTDDINFO.


*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_SQLTDDINFO_STR, 
TABNAME TYPE STRING,
SQLTAB TYPE STRING,
TABCLASS TYPE STRING,
SQLCLASS TYPE STRING,
TABARTT TYPE STRING,
TABKATT TYPE STRING,
BUFALLOT TYPE STRING,
BUFFERMOD TYPE STRING,
SCHFELDANZ TYPE STRING,
DDTEXT TYPE STRING,
MCTEXT TYPE STRING,
MITEXT TYPE STRING,
AUTHOR TYPE STRING,
AUTHOR2 TYPE STRING,
AUTHOR3 TYPE STRING,
AS4USER TYPE STRING,
NROWS TYPE STRING,
TABLEN TYPE STRING,
ANDAT TYPE STRING,
CROWS TYPE STRING,
INDXNAME TYPE STRING,
INDXDESC TYPE STRING,
INDXCRE TYPE STRING,
INDXUNIQ TYPE STRING,END OF T_EKKO_STR.
DATA: WA_SQLTDDINFO_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_SQLTDDINFO_STR-TABNAME sy-vline 
WA_SQLTDDINFO_STR-SQLTAB sy-vline 
WA_SQLTDDINFO_STR-TABCLASS sy-vline 
WA_SQLTDDINFO_STR-SQLCLASS sy-vline 
WA_SQLTDDINFO_STR-TABARTT sy-vline 
WA_SQLTDDINFO_STR-TABKATT sy-vline 
WA_SQLTDDINFO_STR-BUFALLOT sy-vline 
WA_SQLTDDINFO_STR-BUFFERMOD sy-vline 
WA_SQLTDDINFO_STR-SCHFELDANZ sy-vline 
WA_SQLTDDINFO_STR-DDTEXT sy-vline 
WA_SQLTDDINFO_STR-MCTEXT sy-vline 
WA_SQLTDDINFO_STR-MITEXT sy-vline 
WA_SQLTDDINFO_STR-AUTHOR sy-vline 
WA_SQLTDDINFO_STR-AUTHOR2 sy-vline 
WA_SQLTDDINFO_STR-AUTHOR3 sy-vline 
WA_SQLTDDINFO_STR-AS4USER sy-vline 
WA_SQLTDDINFO_STR-NROWS sy-vline 
WA_SQLTDDINFO_STR-TABLEN sy-vline 
WA_SQLTDDINFO_STR-ANDAT sy-vline 
WA_SQLTDDINFO_STR-CROWS sy-vline 
WA_SQLTDDINFO_STR-INDXNAME sy-vline 
WA_SQLTDDINFO_STR-INDXDESC sy-vline 
WA_SQLTDDINFO_STR-INDXCRE sy-vline 
WA_SQLTDDINFO_STR-INDXUNIQ sy-vline      INTO ld_text SEPARATED BY SPACE.

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