ABAP Select data from SAP table TTREV into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TTREV 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. 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 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 TYPE STANDARD TABLE OF TTREV,
      WA_TTREV TYPE TTREV,
      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> TYPE TTREV.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TTREV
*  INTO TABLE @DATA(IT_TTREV2).
*--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 INDEX 1 INTO DATA(WA_TTREV2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TTREV>-VERSION = 1.
<TTREV>-ID = 1.
<TTREV>-EXTENSION = 1.
<TTREV>-EXT_KEY = 1.
<TTREV>-TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TTREV-NODE_ID, sy-vline,
  WA_TTREV-TREE_ID, sy-vline,
  WA_TTREV-MASTERLANG, sy-vline,
  WA_TTREV-RESPONSIBL, sy-vline,
  WA_TTREV-BUFFERMODE, sy-vline,
  WA_TTREV-BUFFERVAR, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TTREV 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 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 INTO WA_TTREV.


*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 MASTERLANG
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TTREV-MASTERLANG
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TTREV-MASTERLANG.
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_STR, 
VERSION TYPE STRING,
ID TYPE STRING,
EXTENSION TYPE STRING,
EXT_KEY TYPE STRING,
TYPE TYPE STRING,
NODE_ID TYPE STRING,
TREE_ID TYPE STRING,
MASTERLANG TYPE STRING,
RESPONSIBL TYPE STRING,
BUFFERMODE TYPE STRING,
BUFFERVAR TYPE STRING,
SINGLENODE TYPE STRING,
FUSER TYPE STRING,
FDATE TYPE STRING,
FTIME TYPE STRING,
FRELEASE TYPE STRING,
LUSER TYPE STRING,
LDATE TYPE STRING,
LTIME TYPE STRING,
LRELEASE TYPE STRING,
TEST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TTREV_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_STR-VERSION sy-vline 
WA_TTREV_STR-ID sy-vline 
WA_TTREV_STR-EXTENSION sy-vline 
WA_TTREV_STR-EXT_KEY sy-vline 
WA_TTREV_STR-TYPE sy-vline 
WA_TTREV_STR-NODE_ID sy-vline 
WA_TTREV_STR-TREE_ID sy-vline 
WA_TTREV_STR-MASTERLANG sy-vline 
WA_TTREV_STR-RESPONSIBL sy-vline 
WA_TTREV_STR-BUFFERMODE sy-vline 
WA_TTREV_STR-BUFFERVAR sy-vline 
WA_TTREV_STR-SINGLENODE sy-vline 
WA_TTREV_STR-FUSER sy-vline 
WA_TTREV_STR-FDATE sy-vline 
WA_TTREV_STR-FTIME sy-vline 
WA_TTREV_STR-FRELEASE sy-vline 
WA_TTREV_STR-LUSER sy-vline 
WA_TTREV_STR-LDATE sy-vline 
WA_TTREV_STR-LTIME sy-vline 
WA_TTREV_STR-LRELEASE sy-vline 
WA_TTREV_STR-TEST sy-vline      INTO ld_text SEPARATED BY SPACE.

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