ABAP Select data from SAP table CLHP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLHP
*  INTO TABLE @DATA(IT_CLHP2).
*--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_CLHP INDEX 1 INTO DATA(WA_CLHP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLHP>-CLASS = 1.
<CLHP>-CLINT = 1.
<CLHP>-PREDECESSOR_CLAS = 1.
<CLHP>-PREDECESSOR_DESC = 1.
<CLHP>-CLASSTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLHP-DESCR_CLASSTYPE, sy-vline,
  WA_CLHP-DATE_VALID_FROM, sy-vline,
  WA_CLHP-CHANGE_NUMBER, sy-vline,
  WA_CLHP-DESCR_CLASS, sy-vline,
  WA_CLHP-DESCR_CLASS_1, sy-vline,
  WA_CLHP-REF_CLASS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLHP 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_CLHP 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_CLHP INTO WA_CLHP.


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

*Conversion exit ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CLHP-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CLHP-LANGUAGE.
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_CLHP_STR, 
CLASS TYPE STRING,
CLINT TYPE STRING,
PREDECESSOR_CLAS TYPE STRING,
PREDECESSOR_DESC TYPE STRING,
CLASSTYPE TYPE STRING,
DESCR_CLASSTYPE TYPE STRING,
DATE_VALID_FROM TYPE STRING,
CHANGE_NUMBER TYPE STRING,
DESCR_CLASS TYPE STRING,
DESCR_CLASS_1 TYPE STRING,
REF_CLASS TYPE STRING,
LANGUAGE TYPE STRING,
BASIC_DATA TYPE STRING,
TEXT_CHAR20 TYPE STRING,
AUTH_CLASS TYPE STRING,
SUB_CLASS TYPE STRING,
SUB_CLASS_DESCR TYPE STRING,
CR_CLASS TYPE STRING,
CR_DESCR_CLASS TYPE STRING,
CR_CLASS_STATUS TYPE STRING,
CR_STATUS_TEXT TYPE STRING,
CR_CLASS_GROUP TYPE STRING,
CR_CATCH_WORD TYPE STRING,
CR_PARENT_CLINT TYPE STRING,
CR_CHILD_CLINT TYPE STRING,
CR_PA_NODE_KEY TYPE STRING,
CR_CH_NODE_KEY TYPE STRING,
CLTXT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLHP_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_CLHP_STR-CLASS sy-vline 
WA_CLHP_STR-CLINT sy-vline 
WA_CLHP_STR-PREDECESSOR_CLAS sy-vline 
WA_CLHP_STR-PREDECESSOR_DESC sy-vline 
WA_CLHP_STR-CLASSTYPE sy-vline 
WA_CLHP_STR-DESCR_CLASSTYPE sy-vline 
WA_CLHP_STR-DATE_VALID_FROM sy-vline 
WA_CLHP_STR-CHANGE_NUMBER sy-vline 
WA_CLHP_STR-DESCR_CLASS sy-vline 
WA_CLHP_STR-DESCR_CLASS_1 sy-vline 
WA_CLHP_STR-REF_CLASS sy-vline 
WA_CLHP_STR-LANGUAGE sy-vline 
WA_CLHP_STR-BASIC_DATA sy-vline 
WA_CLHP_STR-TEXT_CHAR20 sy-vline 
WA_CLHP_STR-AUTH_CLASS sy-vline 
WA_CLHP_STR-SUB_CLASS sy-vline 
WA_CLHP_STR-SUB_CLASS_DESCR sy-vline 
WA_CLHP_STR-CR_CLASS sy-vline 
WA_CLHP_STR-CR_DESCR_CLASS sy-vline 
WA_CLHP_STR-CR_CLASS_STATUS sy-vline 
WA_CLHP_STR-CR_STATUS_TEXT sy-vline 
WA_CLHP_STR-CR_CLASS_GROUP sy-vline 
WA_CLHP_STR-CR_CATCH_WORD sy-vline 
WA_CLHP_STR-CR_PARENT_CLINT sy-vline 
WA_CLHP_STR-CR_CHILD_CLINT sy-vline 
WA_CLHP_STR-CR_PA_NODE_KEY sy-vline 
WA_CLHP_STR-CR_CH_NODE_KEY sy-vline 
WA_CLHP_STR-CLTXT sy-vline      INTO ld_text SEPARATED BY SPACE.

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