ABAP Select data from SAP table KONHDB into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KONHDB 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 KONHDB. 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 KONHDB 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_KONHDB TYPE STANDARD TABLE OF KONHDB,
      WA_KONHDB TYPE KONHDB,
      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: <KONHDB> TYPE KONHDB.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KONHDB
*  INTO TABLE @DATA(IT_KONHDB2).
*--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_KONHDB INDEX 1 INTO DATA(WA_KONHDB2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KONHDB>-MANDT = 1.
<KONHDB>-KNUMH = 1.
<KONHDB>-ERNAM = 1.
<KONHDB>-ERDAT = 1.
<KONHDB>-KVEWE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KONHDB-KOTABNR, sy-vline,
  WA_KONHDB-KAPPL, sy-vline,
  WA_KONHDB-KSCHL, sy-vline,
  WA_KONHDB-DATAB, sy-vline,
  WA_KONHDB-DATBI, sy-vline,
  WA_KONHDB-KOSRT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KONHDB 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_KONHDB 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_KONHDB INTO WA_KONHDB.


*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 KOTAB, internal->external for field KOTABNR
CALL FUNCTION 'CONVERSION_EXIT_KOTAB_OUTPUT'
  EXPORTING
    input =                      WA_KONHDB-KOTABNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KONHDB-KOTABNR.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

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

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

*Conversion exit ALPHA, internal->external for field CCNUM
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_KONHDB-CCNUM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_KONHDB-CCNUM.
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_KONHDB_STR, 
MANDT TYPE STRING,
KNUMH TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
KVEWE TYPE STRING,
KOTABNR TYPE STRING,
KAPPL TYPE STRING,
KSCHL TYPE STRING,
DATAB TYPE STRING,
DATBI TYPE STRING,
KOSRT TYPE STRING,
KZUST TYPE STRING,
KNUMA_PI TYPE STRING,
KNUMA_AG TYPE STRING,
KNUMA_SQ TYPE STRING,
KNUMA_SD TYPE STRING,
AKTNR TYPE STRING,
KNUMA_BO TYPE STRING,
LICNO TYPE STRING,
LICDT TYPE STRING,
TKONN TYPE STRING,
CCNUM TYPE STRING,
EXTERNAL_GUID TYPE STRING,
REFERENCE TYPE STRING,
PRICEAPPROVALREQUEST TYPE STRING,
UPDKZ TYPE STRING,
VAKEY TYPE STRING,
VADAT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KONHDB_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_KONHDB_STR-MANDT sy-vline 
WA_KONHDB_STR-KNUMH sy-vline 
WA_KONHDB_STR-ERNAM sy-vline 
WA_KONHDB_STR-ERDAT sy-vline 
WA_KONHDB_STR-KVEWE sy-vline 
WA_KONHDB_STR-KOTABNR sy-vline 
WA_KONHDB_STR-KAPPL sy-vline 
WA_KONHDB_STR-KSCHL sy-vline 
WA_KONHDB_STR-DATAB sy-vline 
WA_KONHDB_STR-DATBI sy-vline 
WA_KONHDB_STR-KOSRT sy-vline 
WA_KONHDB_STR-KZUST sy-vline 
WA_KONHDB_STR-KNUMA_PI sy-vline 
WA_KONHDB_STR-KNUMA_AG sy-vline 
WA_KONHDB_STR-KNUMA_SQ sy-vline 
WA_KONHDB_STR-KNUMA_SD sy-vline 
WA_KONHDB_STR-AKTNR sy-vline 
WA_KONHDB_STR-KNUMA_BO sy-vline 
WA_KONHDB_STR-LICNO sy-vline 
WA_KONHDB_STR-LICDT sy-vline 
WA_KONHDB_STR-TKONN sy-vline 
WA_KONHDB_STR-CCNUM sy-vline 
WA_KONHDB_STR-EXTERNAL_GUID sy-vline 
WA_KONHDB_STR-REFERENCE sy-vline 
WA_KONHDB_STR-PRICEAPPROVALREQUEST sy-vline 
WA_KONHDB_STR-UPDKZ sy-vline 
WA_KONHDB_STR-VAKEY sy-vline 
WA_KONHDB_STR-VADAT sy-vline      INTO ld_text SEPARATED BY SPACE.

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