ABAP Select data from SAP table CMPWLH into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMPWLH
*  INTO TABLE @DATA(IT_CMPWLH2).
*--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_CMPWLH INDEX 1 INTO DATA(WA_CMPWLH2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMPWLH>-WLID = 1.
<CMPWLH>-KIND = 1.
<CMPWLH>-TR_CUST = 1.
<CMPWLH>-CTEMPLATE = 1.
<CMPWLH>-CPROJECT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMPWLH-CPROJVIEW, sy-vline,
  WA_CMPWLH-SELCLIDEP, sy-vline,
  WA_CMPWLH-SELCLIIND, sy-vline,
  WA_CMPWLH-SELIMG, sy-vline,
  WA_CMPWLH-SELNOIMG, sy-vline,
  WA_CMPWLH-SELCMPTRAN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMPWLH 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_CMPWLH 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_CMPWLH INTO WA_CMPWLH.


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

*Conversion exit ISOLA, internal->external for field LOCLANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CMPWLH-LOCLANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMPWLH-LOCLANGU.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field CMPLANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CMPWLH-CMPLANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMPWLH-CMPLANGU.
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_CMPWLH_STR, 
WLID TYPE STRING,
KIND TYPE STRING,
TR_CUST TYPE STRING,
CTEMPLATE TYPE STRING,
CPROJECT TYPE STRING,
CPROJVIEW TYPE STRING,
SELCLIDEP TYPE STRING,
SELCLIIND TYPE STRING,
SELIMG TYPE STRING,
SELNOIMG TYPE STRING,
SELCMPTRAN TYPE STRING,
CMPWLLEVEL TYPE STRING,
INSCMPWLK TYPE STRING,
CMPSYLANG TYPE STRING,
CMPSYSTAB TYPE STRING,
CLIENT TYPE STRING,
LOCSYSTEM TYPE STRING,
LOCRELEASE TYPE STRING,
LOCLANGU TYPE STRING,
CMPCLIENT TYPE STRING,
CMPSYSTEM TYPE STRING,
CMPRELEASE TYPE STRING,
CMPLANGU TYPE STRING,
RFCDEST TYPE STRING,
CRCUST TYPE STRING,
CRSYST TYPE STRING,
WLUSER TYPE STRING,
WLDATE TYPE STRING,
WLTIME TYPE STRING,
WLTEXT TYPE STRING,
STATE TYPE STRING,
JOBNAME TYPE STRING,
JOBCOUNT TYPE STRING,
OBJECTNAME TYPE STRING,
OBJECTTYPE TYPE STRING,
TABNAME TYPE STRING,
VIEWNAME TYPE STRING,
VIEWTYPE TYPE STRING,
ACTIONDATE TYPE STRING,
ACTIONTIME TYPE STRING,
ACTIONUSER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMPWLH_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_CMPWLH_STR-WLID sy-vline 
WA_CMPWLH_STR-KIND sy-vline 
WA_CMPWLH_STR-TR_CUST sy-vline 
WA_CMPWLH_STR-CTEMPLATE sy-vline 
WA_CMPWLH_STR-CPROJECT sy-vline 
WA_CMPWLH_STR-CPROJVIEW sy-vline 
WA_CMPWLH_STR-SELCLIDEP sy-vline 
WA_CMPWLH_STR-SELCLIIND sy-vline 
WA_CMPWLH_STR-SELIMG sy-vline 
WA_CMPWLH_STR-SELNOIMG sy-vline 
WA_CMPWLH_STR-SELCMPTRAN sy-vline 
WA_CMPWLH_STR-CMPWLLEVEL sy-vline 
WA_CMPWLH_STR-INSCMPWLK sy-vline 
WA_CMPWLH_STR-CMPSYLANG sy-vline 
WA_CMPWLH_STR-CMPSYSTAB sy-vline 
WA_CMPWLH_STR-CLIENT sy-vline 
WA_CMPWLH_STR-LOCSYSTEM sy-vline 
WA_CMPWLH_STR-LOCRELEASE sy-vline 
WA_CMPWLH_STR-LOCLANGU sy-vline 
WA_CMPWLH_STR-CMPCLIENT sy-vline 
WA_CMPWLH_STR-CMPSYSTEM sy-vline 
WA_CMPWLH_STR-CMPRELEASE sy-vline 
WA_CMPWLH_STR-CMPLANGU sy-vline 
WA_CMPWLH_STR-RFCDEST sy-vline 
WA_CMPWLH_STR-CRCUST sy-vline 
WA_CMPWLH_STR-CRSYST sy-vline 
WA_CMPWLH_STR-WLUSER sy-vline 
WA_CMPWLH_STR-WLDATE sy-vline 
WA_CMPWLH_STR-WLTIME sy-vline 
WA_CMPWLH_STR-WLTEXT sy-vline 
WA_CMPWLH_STR-STATE sy-vline 
WA_CMPWLH_STR-JOBNAME sy-vline 
WA_CMPWLH_STR-JOBCOUNT sy-vline 
WA_CMPWLH_STR-OBJECTNAME sy-vline 
WA_CMPWLH_STR-OBJECTTYPE sy-vline 
WA_CMPWLH_STR-TABNAME sy-vline 
WA_CMPWLH_STR-VIEWNAME sy-vline 
WA_CMPWLH_STR-VIEWTYPE sy-vline 
WA_CMPWLH_STR-ACTIONDATE sy-vline 
WA_CMPWLH_STR-ACTIONTIME sy-vline 
WA_CMPWLH_STR-ACTIONUSER sy-vline      INTO ld_text SEPARATED BY SPACE.

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