ABAP Select data from SAP table BAPICLCLHD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM BAPICLCLHD
*  INTO TABLE @DATA(IT_BAPICLCLHD2).
*--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_BAPICLCLHD INDEX 1 INTO DATA(WA_BAPICLCLHD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<BAPICLCLHD>-CLASS_TYPE = 1.
<BAPICLCLHD>-CLASS_NUM = 1.
<BAPICLCLHD>-INTCLASSNR = 1.
<BAPICLCLHD>-CLASS_STAT = 1.
<BAPICLCLHD>-CLASS_GRP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_BAPICLCLHD-FIND_OBJS, sy-vline,
  WA_BAPICLCLHD-CLASS_AUTH, sy-vline,
  WA_BAPICLCLHD-MAINT_AUTH, sy-vline,
  WA_BAPICLCLHD-CREATED_BY, sy-vline,
  WA_BAPICLCLHD-CREAT_DATE, sy-vline,
  WA_BAPICLCLHD-CHANGED_BY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_BAPICLCLHD 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_BAPICLCLHD 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_BAPICLCLHD INTO WA_BAPICLCLHD.


*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 DOC_NUMB
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_BAPICLCLHD-DOC_NUMB
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPICLCLHD-DOC_NUMB.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field BASE_UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_BAPICLCLHD-BASE_UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_BAPICLCLHD-BASE_UOM.
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_BAPICLCLHD_STR, 
CLASS_TYPE TYPE STRING,
CLASS_NUM TYPE STRING,
INTCLASSNR TYPE STRING,
CLASS_STAT TYPE STRING,
CLASS_GRP TYPE STRING,
FIND_OBJS TYPE STRING,
CLASS_AUTH TYPE STRING,
MAINT_AUTH TYPE STRING,
CREATED_BY TYPE STRING,
CREAT_DATE TYPE STRING,
CHANGED_BY TYPE STRING,
CH_ON TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
NO_ALLOC TYPE STRING,
SAME_CLASF TYPE STRING,
DEP_VIEW TYPE STRING,
DOC_NUMB TYPE STRING,
DOC_TYPE TYPE STRING,
DOC_PART TYPE STRING,
DOC_VERS TYPE STRING,
DIN_CLASS TYPE STRING,
STD_ORG TYPE STRING,
STD_NO TYPE STRING,
STD_DESC TYPE STRING,
STD_TITLE1 TYPE STRING,
STD_TITLE2 TYPE STRING,
ISSUE_DATE TYPE STRING,
VERSN_DATE TYPE STRING,
VERSN_NO TYPE STRING,
LEIST TYPE STRING,
USED_SUPCL TYPE STRING,
DIVISION TYPE STRING,
LISTOBJ TYPE STRING,
MMS_TYPE TYPE STRING,
MMS_VIEW TYPE STRING,
RES_ITMCAT TYPE STRING,
REQD_COMP TYPE STRING,
MULTSELECT TYPE STRING,
CVIEW TYPE STRING,
LL_CODE TYPE STRING,
BASE_UOM TYPE STRING,
BASEUOMISO TYPE STRING,
OVERWRITE TYPE STRING,
IN_BOMS TYPE STRING,
TASK_LISTS TYPE STRING,
ALT_DISP TYPE STRING,
WIDTH TYPE STRING,
BLOCK_NAME TYPE STRING,
MAX_BLOCK TYPE STRING,
ALLOC_NO TYPE STRING,
LOCAL TYPE STRING,END OF T_EKKO_STR.
DATA: WA_BAPICLCLHD_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_BAPICLCLHD_STR-CLASS_TYPE sy-vline 
WA_BAPICLCLHD_STR-CLASS_NUM sy-vline 
WA_BAPICLCLHD_STR-INTCLASSNR sy-vline 
WA_BAPICLCLHD_STR-CLASS_STAT sy-vline 
WA_BAPICLCLHD_STR-CLASS_GRP sy-vline 
WA_BAPICLCLHD_STR-FIND_OBJS sy-vline 
WA_BAPICLCLHD_STR-CLASS_AUTH sy-vline 
WA_BAPICLCLHD_STR-MAINT_AUTH sy-vline 
WA_BAPICLCLHD_STR-CREATED_BY sy-vline 
WA_BAPICLCLHD_STR-CREAT_DATE sy-vline 
WA_BAPICLCLHD_STR-CHANGED_BY sy-vline 
WA_BAPICLCLHD_STR-CH_ON sy-vline 
WA_BAPICLCLHD_STR-VALID_FROM sy-vline 
WA_BAPICLCLHD_STR-VALID_TO sy-vline 
WA_BAPICLCLHD_STR-NO_ALLOC sy-vline 
WA_BAPICLCLHD_STR-SAME_CLASF sy-vline 
WA_BAPICLCLHD_STR-DEP_VIEW sy-vline 
WA_BAPICLCLHD_STR-DOC_NUMB sy-vline 
WA_BAPICLCLHD_STR-DOC_TYPE sy-vline 
WA_BAPICLCLHD_STR-DOC_PART sy-vline 
WA_BAPICLCLHD_STR-DOC_VERS sy-vline 
WA_BAPICLCLHD_STR-DIN_CLASS sy-vline 
WA_BAPICLCLHD_STR-STD_ORG sy-vline 
WA_BAPICLCLHD_STR-STD_NO sy-vline 
WA_BAPICLCLHD_STR-STD_DESC sy-vline 
WA_BAPICLCLHD_STR-STD_TITLE1 sy-vline 
WA_BAPICLCLHD_STR-STD_TITLE2 sy-vline 
WA_BAPICLCLHD_STR-ISSUE_DATE sy-vline 
WA_BAPICLCLHD_STR-VERSN_DATE sy-vline 
WA_BAPICLCLHD_STR-VERSN_NO sy-vline 
WA_BAPICLCLHD_STR-LEIST sy-vline 
WA_BAPICLCLHD_STR-USED_SUPCL sy-vline 
WA_BAPICLCLHD_STR-DIVISION sy-vline 
WA_BAPICLCLHD_STR-LISTOBJ sy-vline 
WA_BAPICLCLHD_STR-MMS_TYPE sy-vline 
WA_BAPICLCLHD_STR-MMS_VIEW sy-vline 
WA_BAPICLCLHD_STR-RES_ITMCAT sy-vline 
WA_BAPICLCLHD_STR-REQD_COMP sy-vline 
WA_BAPICLCLHD_STR-MULTSELECT sy-vline 
WA_BAPICLCLHD_STR-CVIEW sy-vline 
WA_BAPICLCLHD_STR-LL_CODE sy-vline 
WA_BAPICLCLHD_STR-BASE_UOM sy-vline 
WA_BAPICLCLHD_STR-BASEUOMISO sy-vline 
WA_BAPICLCLHD_STR-OVERWRITE sy-vline 
WA_BAPICLCLHD_STR-IN_BOMS sy-vline 
WA_BAPICLCLHD_STR-TASK_LISTS sy-vline 
WA_BAPICLCLHD_STR-ALT_DISP sy-vline 
WA_BAPICLCLHD_STR-WIDTH sy-vline 
WA_BAPICLCLHD_STR-BLOCK_NAME sy-vline 
WA_BAPICLCLHD_STR-MAX_BLOCK sy-vline 
WA_BAPICLCLHD_STR-ALLOC_NO sy-vline 
WA_BAPICLCLHD_STR-LOCAL sy-vline      INTO ld_text SEPARATED BY SPACE.

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