ABAP Select data from SAP table KLAH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KLAH
*  INTO TABLE @DATA(IT_KLAH2).
*--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_KLAH INDEX 1 INTO DATA(WA_KLAH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KLAH>-MANDT = 1.
<KLAH>-CLINT = 1.
<KLAH>-KLART = 1.
<KLAH>-CLASS = 1.
<KLAH>-STATU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KLAH-KLAGR, sy-vline,
  WA_KLAH-BGRSE, sy-vline,
  WA_KLAH-BGRKL, sy-vline,
  WA_KLAH-BGRKP, sy-vline,
  WA_KLAH-ANAME, sy-vline,
  WA_KLAH-ADATU, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KLAH 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_KLAH 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_KLAH INTO WA_KLAH.


*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 ALPHA, internal->external for field DOKNR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KLAH-DOKNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLAH-DOKNR.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_KLAH-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KLAH-MEINS.
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_KLAH_STR, 
MANDT TYPE STRING,
CLINT TYPE STRING,
KLART TYPE STRING,
CLASS TYPE STRING,
STATU TYPE STRING,
KLAGR TYPE STRING,
BGRSE TYPE STRING,
BGRKL TYPE STRING,
BGRKP TYPE STRING,
ANAME TYPE STRING,
ADATU TYPE STRING,
VNAME TYPE STRING,
VDATU TYPE STRING,
VONDT TYPE STRING,
BISDT TYPE STRING,
ANZUO TYPE STRING,
PRAUS TYPE STRING,
SICHT TYPE STRING,
DOKNR TYPE STRING,
DOKAR TYPE STRING,
DOKTL TYPE STRING,
DOKVR TYPE STRING,
DINKZ TYPE STRING,
NNORM TYPE STRING,
NORMN TYPE STRING,
NORMB TYPE STRING,
NRMT1 TYPE STRING,
NRMT2 TYPE STRING,
AUSGD TYPE STRING,
VERSD TYPE STRING,
VERSI TYPE STRING,
LEIST TYPE STRING,
VERWE TYPE STRING,
SPART TYPE STRING,
LREF3 TYPE STRING,
WWSKZ TYPE STRING,
WWSSI TYPE STRING,
POTPR TYPE STRING,
CLOBK TYPE STRING,
CLMUL TYPE STRING,
CVIEW TYPE STRING,
DISST TYPE STRING,
MEINS TYPE STRING,
CLMOD TYPE STRING,
VWSTL TYPE STRING,
VWPLA TYPE STRING,
CLALT TYPE STRING,
LBREI TYPE STRING,
BNAME TYPE STRING,
MAXBL TYPE STRING,
KNOBJ TYPE STRING,
LOCLA TYPE STRING,
KATALOG TYPE STRING,
KDOKAZ TYPE STRING,
GENRKZ TYPE STRING,
LASTCHANGEDDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KLAH_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_KLAH_STR-MANDT sy-vline 
WA_KLAH_STR-CLINT sy-vline 
WA_KLAH_STR-KLART sy-vline 
WA_KLAH_STR-CLASS sy-vline 
WA_KLAH_STR-STATU sy-vline 
WA_KLAH_STR-KLAGR sy-vline 
WA_KLAH_STR-BGRSE sy-vline 
WA_KLAH_STR-BGRKL sy-vline 
WA_KLAH_STR-BGRKP sy-vline 
WA_KLAH_STR-ANAME sy-vline 
WA_KLAH_STR-ADATU sy-vline 
WA_KLAH_STR-VNAME sy-vline 
WA_KLAH_STR-VDATU sy-vline 
WA_KLAH_STR-VONDT sy-vline 
WA_KLAH_STR-BISDT sy-vline 
WA_KLAH_STR-ANZUO sy-vline 
WA_KLAH_STR-PRAUS sy-vline 
WA_KLAH_STR-SICHT sy-vline 
WA_KLAH_STR-DOKNR sy-vline 
WA_KLAH_STR-DOKAR sy-vline 
WA_KLAH_STR-DOKTL sy-vline 
WA_KLAH_STR-DOKVR sy-vline 
WA_KLAH_STR-DINKZ sy-vline 
WA_KLAH_STR-NNORM sy-vline 
WA_KLAH_STR-NORMN sy-vline 
WA_KLAH_STR-NORMB sy-vline 
WA_KLAH_STR-NRMT1 sy-vline 
WA_KLAH_STR-NRMT2 sy-vline 
WA_KLAH_STR-AUSGD sy-vline 
WA_KLAH_STR-VERSD sy-vline 
WA_KLAH_STR-VERSI sy-vline 
WA_KLAH_STR-LEIST sy-vline 
WA_KLAH_STR-VERWE sy-vline 
WA_KLAH_STR-SPART sy-vline 
WA_KLAH_STR-LREF3 sy-vline 
WA_KLAH_STR-WWSKZ sy-vline 
WA_KLAH_STR-WWSSI sy-vline 
WA_KLAH_STR-POTPR sy-vline 
WA_KLAH_STR-CLOBK sy-vline 
WA_KLAH_STR-CLMUL sy-vline 
WA_KLAH_STR-CVIEW sy-vline 
WA_KLAH_STR-DISST sy-vline 
WA_KLAH_STR-MEINS sy-vline 
WA_KLAH_STR-CLMOD sy-vline 
WA_KLAH_STR-VWSTL sy-vline 
WA_KLAH_STR-VWPLA sy-vline 
WA_KLAH_STR-CLALT sy-vline 
WA_KLAH_STR-LBREI sy-vline 
WA_KLAH_STR-BNAME sy-vline 
WA_KLAH_STR-MAXBL sy-vline 
WA_KLAH_STR-KNOBJ sy-vline 
WA_KLAH_STR-LOCLA sy-vline 
WA_KLAH_STR-KATALOG sy-vline 
WA_KLAH_STR-KDOKAZ sy-vline 
WA_KLAH_STR-GENRKZ sy-vline 
WA_KLAH_STR-LASTCHANGEDDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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