ABAP Select data from SAP table TRDEVCLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRDEVCLASS
*  INTO TABLE @DATA(IT_TRDEVCLASS2).
*--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_TRDEVCLASS INDEX 1 INTO DATA(WA_TRDEVCLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRDEVCLASS>-DEVCLASS = 1.
<TRDEVCLASS>-CTEXT = 1.
<TRDEVCLASS>-AS4USER = 1.
<TRDEVCLASS>-PDEVCLASS = 1.
<TRDEVCLASS>-DLVUNIT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRDEVCLASS-COMPONENT, sy-vline,
  WA_TRDEVCLASS-COMP_APPR, sy-vline,
  WA_TRDEVCLASS-COMP_TEXT, sy-vline,
  WA_TRDEVCLASS-KORRFLAG, sy-vline,
  WA_TRDEVCLASS-NAMESPACE, sy-vline,
  WA_TRDEVCLASS-PARENTCL, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRDEVCLASS 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_TRDEVCLASS 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_TRDEVCLASS INTO WA_TRDEVCLASS.


*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_TRDEVCLASS_STR, 
DEVCLASS TYPE STRING,
CTEXT TYPE STRING,
AS4USER TYPE STRING,
PDEVCLASS TYPE STRING,
DLVUNIT TYPE STRING,
COMPONENT TYPE STRING,
COMP_APPR TYPE STRING,
COMP_TEXT TYPE STRING,
KORRFLAG TYPE STRING,
NAMESPACE TYPE STRING,
PARENTCL TYPE STRING,
TPCLASS TYPE STRING,
TYPE TYPE STRING,
TARGET 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,END OF T_EKKO_STR.
DATA: WA_TRDEVCLASS_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_TRDEVCLASS_STR-DEVCLASS sy-vline 
WA_TRDEVCLASS_STR-CTEXT sy-vline 
WA_TRDEVCLASS_STR-AS4USER sy-vline 
WA_TRDEVCLASS_STR-PDEVCLASS sy-vline 
WA_TRDEVCLASS_STR-DLVUNIT sy-vline 
WA_TRDEVCLASS_STR-COMPONENT sy-vline 
WA_TRDEVCLASS_STR-COMP_APPR sy-vline 
WA_TRDEVCLASS_STR-COMP_TEXT sy-vline 
WA_TRDEVCLASS_STR-KORRFLAG sy-vline 
WA_TRDEVCLASS_STR-NAMESPACE sy-vline 
WA_TRDEVCLASS_STR-PARENTCL sy-vline 
WA_TRDEVCLASS_STR-TPCLASS sy-vline 
WA_TRDEVCLASS_STR-TYPE sy-vline 
WA_TRDEVCLASS_STR-TARGET sy-vline 
WA_TRDEVCLASS_STR-PACKTYPE sy-vline 
WA_TRDEVCLASS_STR-RESTRICTED sy-vline 
WA_TRDEVCLASS_STR-MAINPACK sy-vline 
WA_TRDEVCLASS_STR-CREATED_BY sy-vline 
WA_TRDEVCLASS_STR-CREATED_ON sy-vline 
WA_TRDEVCLASS_STR-CHANGED_BY sy-vline 
WA_TRDEVCLASS_STR-CHANGED_ON sy-vline      INTO ld_text SEPARATED BY SPACE.

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