ABAP Select data from SAP table TTREV_ROLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TTREV_ROLE
*  INTO TABLE @DATA(IT_TTREV_ROLE2).
*--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_TTREV_ROLE INDEX 1 INTO DATA(WA_TTREV_ROLE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TTREV_ROLE>-COMPARE_ID = 1.
<TTREV_ROLE>-LEFT_RIGHT = 1.
<TTREV_ROLE>-OBJECT_ID = 1.
<TTREV_ROLE>-PARENT_ID = 1.
<TTREV_ROLE>-FOLDER = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TTREV_ROLE-MENU_LEVEL, sy-vline,
  WA_TTREV_ROLE-SORT_ORDER, sy-vline,
  WA_TTREV_ROLE-STRING1, sy-vline,
  WA_TTREV_ROLE-STRING2, sy-vline,
  WA_TTREV_ROLE-SPRAS, sy-vline,
  WA_TTREV_ROLE-TEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TTREV_ROLE 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_TTREV_ROLE 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_TTREV_ROLE INTO WA_TTREV_ROLE.


*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 ISOLA, internal->external for field SPRAS
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TTREV_ROLE-SPRAS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TTREV_ROLE-SPRAS.
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_TTREV_ROLE_STR, 
COMPARE_ID TYPE STRING,
LEFT_RIGHT TYPE STRING,
OBJECT_ID TYPE STRING,
PARENT_ID TYPE STRING,
FOLDER TYPE STRING,
MENU_LEVEL TYPE STRING,
SORT_ORDER TYPE STRING,
STRING1 TYPE STRING,
STRING2 TYPE STRING,
SPRAS TYPE STRING,
TEXT TYPE STRING,
DIFF_FLAG TYPE STRING,
GUID_ID TYPE STRING,
GUID_PARNT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TTREV_ROLE_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_TTREV_ROLE_STR-COMPARE_ID sy-vline 
WA_TTREV_ROLE_STR-LEFT_RIGHT sy-vline 
WA_TTREV_ROLE_STR-OBJECT_ID sy-vline 
WA_TTREV_ROLE_STR-PARENT_ID sy-vline 
WA_TTREV_ROLE_STR-FOLDER sy-vline 
WA_TTREV_ROLE_STR-MENU_LEVEL sy-vline 
WA_TTREV_ROLE_STR-SORT_ORDER sy-vline 
WA_TTREV_ROLE_STR-STRING1 sy-vline 
WA_TTREV_ROLE_STR-STRING2 sy-vline 
WA_TTREV_ROLE_STR-SPRAS sy-vline 
WA_TTREV_ROLE_STR-TEXT sy-vline 
WA_TTREV_ROLE_STR-DIFF_FLAG sy-vline 
WA_TTREV_ROLE_STR-GUID_ID sy-vline 
WA_TTREV_ROLE_STR-GUID_PARNT sy-vline      INTO ld_text SEPARATED BY SPACE.

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