ABAP Select data from SAP table /SDF/TECHD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /SDF/TECHD 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 /SDF/TECHD. 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 /SDF/TECHD 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_/SDF/TECHD TYPE STANDARD TABLE OF /SDF/TECHD,
      WA_/SDF/TECHD TYPE /SDF/TECHD,
      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: </SDF/TECHD> TYPE /SDF/TECHD.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /SDF/TECHD
  INTO TABLE IT_/SDF/TECHD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /SDF/TECHD
*  INTO TABLE @DATA(IT_/SDF/TECHD2).
*--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_/SDF/TECHD INDEX 1 INTO DATA(WA_/SDF/TECHD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/SDF/TECHD ASSIGNING </SDF/TECHD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</SDF/TECHD>-CRDATE = 1.
</SDF/TECHD>-REPORT_NAME = 1.
</SDF/TECHD>-REPORT_VERSION = 1.
</SDF/TECHD>-DB_VENDOR = 1.
</SDF/TECHD>-DB_RELEASE = 1.

ENDLOOP.

LOOP AT IT_/SDF/TECHD INTO WA_/SDF/TECHD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/SDF/TECHD-UNICODE, sy-vline,
  WA_/SDF/TECHD-SID, sy-vline,
  WA_/SDF/TECHD-SAPVERSION, sy-vline,
  WA_/SDF/TECHD-KERNVERSION, sy-vline,
  WA_/SDF/TECHD-OSVERSION, sy-vline,
  WA_/SDF/TECHD-SUCCESS_CNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/SDF/TECHD 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_/SDF/TECHD 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_/SDF/TECHD INTO WA_/SDF/TECHD.


*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_/SDF/TECHD_STR, 
CRDATE TYPE STRING,
REPORT_NAME TYPE STRING,
REPORT_VERSION TYPE STRING,
DB_VENDOR TYPE STRING,
DB_RELEASE TYPE STRING,
UNICODE TYPE STRING,
SID TYPE STRING,
SAPVERSION TYPE STRING,
KERNVERSION TYPE STRING,
OSVERSION TYPE STRING,
SUCCESS_CNT TYPE STRING,
PARTIAL_CNT TYPE STRING,
ERROR_CNT TYPE STRING,
MSS1691513 TYPE STRING,
LCERROR TYPE STRING,
PREC TYPE STRING,
DAAG TYPE STRING,
PARAL TYPE STRING,
HDBLOAD TYPE STRING,
HL TYPE STRING,
MAC TYPE STRING,
HDBV TYPE STRING,
CALIB TYPE STRING,
DO_SOH TYPE STRING,
DO_SFIN TYPE STRING,
DO_SLOG TYPE STRING,
IN_SFIN TYPE STRING,
IN_SLOG TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/SDF/TECHD_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_/SDF/TECHD_STR-CRDATE sy-vline 
WA_/SDF/TECHD_STR-REPORT_NAME sy-vline 
WA_/SDF/TECHD_STR-REPORT_VERSION sy-vline 
WA_/SDF/TECHD_STR-DB_VENDOR sy-vline 
WA_/SDF/TECHD_STR-DB_RELEASE sy-vline 
WA_/SDF/TECHD_STR-UNICODE sy-vline 
WA_/SDF/TECHD_STR-SID sy-vline 
WA_/SDF/TECHD_STR-SAPVERSION sy-vline 
WA_/SDF/TECHD_STR-KERNVERSION sy-vline 
WA_/SDF/TECHD_STR-OSVERSION sy-vline 
WA_/SDF/TECHD_STR-SUCCESS_CNT sy-vline 
WA_/SDF/TECHD_STR-PARTIAL_CNT sy-vline 
WA_/SDF/TECHD_STR-ERROR_CNT sy-vline 
WA_/SDF/TECHD_STR-MSS1691513 sy-vline 
WA_/SDF/TECHD_STR-LCERROR sy-vline 
WA_/SDF/TECHD_STR-PREC sy-vline 
WA_/SDF/TECHD_STR-DAAG sy-vline 
WA_/SDF/TECHD_STR-PARAL sy-vline 
WA_/SDF/TECHD_STR-HDBLOAD sy-vline 
WA_/SDF/TECHD_STR-HL sy-vline 
WA_/SDF/TECHD_STR-MAC sy-vline 
WA_/SDF/TECHD_STR-HDBV sy-vline 
WA_/SDF/TECHD_STR-CALIB sy-vline 
WA_/SDF/TECHD_STR-DO_SOH sy-vline 
WA_/SDF/TECHD_STR-DO_SFIN sy-vline 
WA_/SDF/TECHD_STR-DO_SLOG sy-vline 
WA_/SDF/TECHD_STR-IN_SFIN sy-vline 
WA_/SDF/TECHD_STR-IN_SLOG sy-vline      INTO ld_text SEPARATED BY SPACE.

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