ABAP Select data from SAP table TRKB1U into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP TRKB1U 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 TRKB1U. 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 TRKB1U 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_TRKB1U TYPE STANDARD TABLE OF TRKB1U,
      WA_TRKB1U TYPE TRKB1U,
      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: <TRKB1U> TYPE TRKB1U.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_TRKB1U.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM TRKB1U
  INTO TABLE IT_TRKB1U.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRKB1U
*  INTO TABLE @DATA(IT_TRKB1U2).
*--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_TRKB1U INDEX 1 INTO DATA(WA_TRKB1U2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_TRKB1U ASSIGNING <TRKB1U>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRKB1U>-APPLCLASS = 1.
<TRKB1U>-TABNAME = 1.
<TRKB1U>-CUANM = 1.
<TRKB1U>-M_CUANM = 1.
<TRKB1U>-RNAMEI = 1.

ENDLOOP.

LOOP AT IT_TRKB1U INTO WA_TRKB1U.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRKB1U-APPL, sy-vline,
  WA_TRKB1U-CLAS, sy-vline,
  WA_TRKB1U-NACHLESEN, sy-vline,
  WA_TRKB1U-SEL_VER, sy-vline,
  WA_TRKB1U-LDBNAME, sy-vline,
  WA_TRKB1U-NO_SCREEN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRKB1U 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_TRKB1U 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_TRKB1U INTO WA_TRKB1U.


*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_TRKB1U_STR, 
APPLCLASS TYPE STRING,
TABNAME TYPE STRING,
CUANM TYPE STRING,
M_CUANM TYPE STRING,
RNAMEI TYPE STRING,
APPL TYPE STRING,
CLAS TYPE STRING,
NACHLESEN TYPE STRING,
SEL_VER TYPE STRING,
LDBNAME TYPE STRING,
NO_SCREEN TYPE STRING,
TABKZ TYPE STRING,
USER_EXIT TYPE STRING,
PERIOKZ TYPE STRING,
POPUP_EXEC TYPE STRING,
SEL_DF TYPE STRING,
FB_DATA TYPE STRING,
EXPTIME TYPE STRING,
FB_WAERS TYPE STRING,
FB_H_INFO TYPE STRING,
FB_GENER TYPE STRING,
FB_ADD_INSIGHT TYPE STRING,
REDUCE_SEL TYPE STRING,
ADDSELKZ TYPE STRING,
WAERS_OK TYPE STRING,
WAERS_DY TYPE STRING,
OK_CODE TYPE STRING,
CONFIRMS TYPE STRING,
PERI_CHECK TYPE STRING,
CUALEVEL TYPE STRING,
EXTERN TYPE STRING,
RKB1UEXIT TYPE STRING,
ENQUEUE TYPE STRING,
SELECT_OPTION TYPE STRING,
BBSVAR_ADDSEL TYPE STRING,
FB_H_KNOTEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRKB1U_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_TRKB1U_STR-APPLCLASS sy-vline 
WA_TRKB1U_STR-TABNAME sy-vline 
WA_TRKB1U_STR-CUANM sy-vline 
WA_TRKB1U_STR-M_CUANM sy-vline 
WA_TRKB1U_STR-RNAMEI sy-vline 
WA_TRKB1U_STR-APPL sy-vline 
WA_TRKB1U_STR-CLAS sy-vline 
WA_TRKB1U_STR-NACHLESEN sy-vline 
WA_TRKB1U_STR-SEL_VER sy-vline 
WA_TRKB1U_STR-LDBNAME sy-vline 
WA_TRKB1U_STR-NO_SCREEN sy-vline 
WA_TRKB1U_STR-TABKZ sy-vline 
WA_TRKB1U_STR-USER_EXIT sy-vline 
WA_TRKB1U_STR-PERIOKZ sy-vline 
WA_TRKB1U_STR-POPUP_EXEC sy-vline 
WA_TRKB1U_STR-SEL_DF sy-vline 
WA_TRKB1U_STR-FB_DATA sy-vline 
WA_TRKB1U_STR-EXPTIME sy-vline 
WA_TRKB1U_STR-FB_WAERS sy-vline 
WA_TRKB1U_STR-FB_H_INFO sy-vline 
WA_TRKB1U_STR-FB_GENER sy-vline 
WA_TRKB1U_STR-FB_ADD_INSIGHT sy-vline 
WA_TRKB1U_STR-REDUCE_SEL sy-vline 
WA_TRKB1U_STR-ADDSELKZ sy-vline 
WA_TRKB1U_STR-WAERS_OK sy-vline 
WA_TRKB1U_STR-WAERS_DY sy-vline 
WA_TRKB1U_STR-OK_CODE sy-vline 
WA_TRKB1U_STR-CONFIRMS sy-vline 
WA_TRKB1U_STR-PERI_CHECK sy-vline 
WA_TRKB1U_STR-CUALEVEL sy-vline 
WA_TRKB1U_STR-EXTERN sy-vline 
WA_TRKB1U_STR-RKB1UEXIT sy-vline 
WA_TRKB1U_STR-ENQUEUE sy-vline 
WA_TRKB1U_STR-SELECT_OPTION sy-vline 
WA_TRKB1U_STR-BBSVAR_ADDSEL sy-vline 
WA_TRKB1U_STR-FB_H_KNOTEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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