ABAP Select data from SAP table TDEVC into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TDEVC
*  INTO TABLE @DATA(IT_TDEVC2).
*--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_TDEVC INDEX 1 INTO DATA(WA_TDEVC2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TDEVC>-DEVCLASS = 1.
<TDEVC>-INTSYS = 1.
<TDEVC>-CONSYS = 1.
<TDEVC>-CTEXT = 1.
<TDEVC>-KORRFLAG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TDEVC-AS4USER, sy-vline,
  WA_TDEVC-PDEVCLASS, sy-vline,
  WA_TDEVC-DLVUNIT, sy-vline,
  WA_TDEVC-COMPONENT, sy-vline,
  WA_TDEVC-NAMESPACE, sy-vline,
  WA_TDEVC-TPCLASS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TDEVC 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_TDEVC 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_TDEVC INTO WA_TDEVC.


*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_TDEVC_STR, 
DEVCLASS TYPE STRING,
INTSYS TYPE STRING,
CONSYS TYPE STRING,
CTEXT TYPE STRING,
KORRFLAG TYPE STRING,
AS4USER TYPE STRING,
PDEVCLASS TYPE STRING,
DLVUNIT TYPE STRING,
COMPONENT TYPE STRING,
NAMESPACE TYPE STRING,
TPCLASS TYPE STRING,
SHIPMENT TYPE STRING,
PARENTCL TYPE STRING,
APPLICAT TYPE STRING,
ERRSEVRTY TYPE STRING,
PERMINHER TYPE STRING,
INTFPREFX TYPE STRING,
PACKTYPE TYPE STRING,
RESTRICTED TYPE STRING,
MAINPACK TYPE STRING,
CREATED_BY TYPE STRING,
CREATED_ON TYPE STRING,
CHANGED_BY TYPE STRING,
CHANGED_ON TYPE STRING,
SRV_CHECK TYPE STRING,
CLI_CHECK TYPE STRING,
EXT_ALIAS TYPE STRING,
PROJECT_GUID TYPE STRING,
PROJECT_PASSDOWN TYPE STRING,
IS_ENHANCEABLE TYPE STRING,
PACKAGE_KIND TYPE STRING,
ENHANCED_PACKAGE TYPE STRING,
ACCESS_OBJECT TYPE STRING,
DEFAULT_INTF TYPE STRING,
INHERIT_CLI_INTF TYPE STRING,
TECH_CHG_TSTMP TYPE STRING,
OVERALL_TSTMP TYPE STRING,
ENCAPSULATION TYPE STRING,
DCL_ENABLED TYPE STRING,
SUB_KEY TYPE STRING,
ALLOW_STATIC TYPE STRING,
SWITCH_ID TYPE STRING,
CHECK_RULE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TDEVC_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_TDEVC_STR-DEVCLASS sy-vline 
WA_TDEVC_STR-INTSYS sy-vline 
WA_TDEVC_STR-CONSYS sy-vline 
WA_TDEVC_STR-CTEXT sy-vline 
WA_TDEVC_STR-KORRFLAG sy-vline 
WA_TDEVC_STR-AS4USER sy-vline 
WA_TDEVC_STR-PDEVCLASS sy-vline 
WA_TDEVC_STR-DLVUNIT sy-vline 
WA_TDEVC_STR-COMPONENT sy-vline 
WA_TDEVC_STR-NAMESPACE sy-vline 
WA_TDEVC_STR-TPCLASS sy-vline 
WA_TDEVC_STR-SHIPMENT sy-vline 
WA_TDEVC_STR-PARENTCL sy-vline 
WA_TDEVC_STR-APPLICAT sy-vline 
WA_TDEVC_STR-ERRSEVRTY sy-vline 
WA_TDEVC_STR-PERMINHER sy-vline 
WA_TDEVC_STR-INTFPREFX sy-vline 
WA_TDEVC_STR-PACKTYPE sy-vline 
WA_TDEVC_STR-RESTRICTED sy-vline 
WA_TDEVC_STR-MAINPACK sy-vline 
WA_TDEVC_STR-CREATED_BY sy-vline 
WA_TDEVC_STR-CREATED_ON sy-vline 
WA_TDEVC_STR-CHANGED_BY sy-vline 
WA_TDEVC_STR-CHANGED_ON sy-vline 
WA_TDEVC_STR-SRV_CHECK sy-vline 
WA_TDEVC_STR-CLI_CHECK sy-vline 
WA_TDEVC_STR-EXT_ALIAS sy-vline 
WA_TDEVC_STR-PROJECT_GUID sy-vline 
WA_TDEVC_STR-PROJECT_PASSDOWN sy-vline 
WA_TDEVC_STR-IS_ENHANCEABLE sy-vline 
WA_TDEVC_STR-PACKAGE_KIND sy-vline 
WA_TDEVC_STR-ENHANCED_PACKAGE sy-vline 
WA_TDEVC_STR-ACCESS_OBJECT sy-vline 
WA_TDEVC_STR-DEFAULT_INTF sy-vline 
WA_TDEVC_STR-INHERIT_CLI_INTF sy-vline 
WA_TDEVC_STR-TECH_CHG_TSTMP sy-vline 
WA_TDEVC_STR-OVERALL_TSTMP sy-vline 
WA_TDEVC_STR-ENCAPSULATION sy-vline 
WA_TDEVC_STR-DCL_ENABLED sy-vline 
WA_TDEVC_STR-SUB_KEY sy-vline 
WA_TDEVC_STR-ALLOW_STATIC sy-vline 
WA_TDEVC_STR-SWITCH_ID sy-vline 
WA_TDEVC_STR-CHECK_RULE sy-vline      INTO ld_text SEPARATED BY SPACE.

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