ABAP Select data from SAP table T77KB into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T77KB 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 T77KB. 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 T77KB 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_T77KB TYPE STANDARD TABLE OF T77KB,
      WA_T77KB TYPE T77KB,
      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: <T77KB> TYPE T77KB.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T77KB.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T77KB
  INTO TABLE IT_T77KB.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T77KB
*  INTO TABLE @DATA(IT_T77KB2).
*--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_T77KB INDEX 1 INTO DATA(WA_T77KB2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T77KB ASSIGNING <T77KB>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T77KB>-MANDT = 1.
<T77KB>-KOBES = 1.
<T77KB>-ENDDA = 1.
<T77KB>-BEGDA = 1.
<T77KB>-PRICE = 1.

ENDLOOP.

LOOP AT IT_T77KB INTO WA_T77KB.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T77KB-WAERS, sy-vline,
  WA_T77KB-BUNIT, sy-vline,
  WA_T77KB-BZGME, sy-vline,
  WA_T77KB-KTNRA, sy-vline,
  WA_T77KB-KOKRS, sy-vline,
  WA_T77KB-NOTRA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T77KB 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_T77KB 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_T77KB INTO WA_T77KB.


*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 CUNIT, internal->external for field BZGME
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_T77KB-BZGME
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T77KB-BZGME.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KTNRA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T77KB-KTNRA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T77KB-KTNRA.
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_T77KB_STR, 
MANDT TYPE STRING,
KOBES TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
PRICE TYPE STRING,
WAERS TYPE STRING,
BUNIT TYPE STRING,
BZGME TYPE STRING,
KTNRA TYPE STRING,
KOKRS TYPE STRING,
NOTRA TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T77KB_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_T77KB_STR-MANDT sy-vline 
WA_T77KB_STR-KOBES sy-vline 
WA_T77KB_STR-ENDDA sy-vline 
WA_T77KB_STR-BEGDA sy-vline 
WA_T77KB_STR-PRICE sy-vline 
WA_T77KB_STR-WAERS sy-vline 
WA_T77KB_STR-BUNIT sy-vline 
WA_T77KB_STR-BZGME sy-vline 
WA_T77KB_STR-KTNRA sy-vline 
WA_T77KB_STR-KOKRS sy-vline 
WA_T77KB_STR-NOTRA sy-vline      INTO ld_text SEPARATED BY SPACE.

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