ABAP Select data from SAP table IWCCAPOVWTP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM IWCCAPOVWTP
*  INTO TABLE @DATA(IT_IWCCAPOVWTP2).
*--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_IWCCAPOVWTP INDEX 1 INTO DATA(WA_IWCCAPOVWTP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<IWCCAPOVWTP>-MANDT = 1.
<IWCCAPOVWTP>-WORKCENTERINTERNALID = 1.
<IWCCAPOVWTP>-WORKCENTERTYPECODE = 1.
<IWCCAPOVWTP>-CAPACITYCATEGORYALLOCATION = 1.
<IWCCAPOVWTP>-CAPACITYINTERNALID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_IWCCAPOVWTP-LASTCHANGEDATETIME, sy-vline,
  WA_IWCCAPOVWTP-PLANT, sy-vline,
  WA_IWCCAPOVWTP-WORKCENTER, sy-vline,
  WA_IWCCAPOVWTP-CAPACITYCATEGORYCODE, sy-vline,
  WA_IWCCAPOVWTP-CAPACITY, sy-vline,
  WA_IWCCAPOVWTP-CAPACITYACTIVEVERSION, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_IWCCAPOVWTP 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_IWCCAPOVWTP 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_IWCCAPOVWTP INTO WA_IWCCAPOVWTP.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_IWCCAPOVWTP_STR, 
MANDT TYPE STRING,
WORKCENTERINTERNALID TYPE STRING,
WORKCENTERTYPECODE TYPE STRING,
CAPACITYCATEGORYALLOCATION TYPE STRING,
CAPACITYINTERNALID TYPE STRING,
LASTCHANGEDATETIME TYPE STRING,
PLANT TYPE STRING,
WORKCENTER TYPE STRING,
CAPACITYCATEGORYCODE TYPE STRING,
CAPACITY TYPE STRING,
CAPACITYACTIVEVERSION TYPE STRING,
WORKCENTERRESPONSIBLE TYPE STRING,
SHIFTTABLEHASCHANGED TYPE STRING,
CAPACITYLASTCHANGEDATETIME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_IWCCAPOVWTP_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_IWCCAPOVWTP_STR-MANDT sy-vline 
WA_IWCCAPOVWTP_STR-WORKCENTERINTERNALID sy-vline 
WA_IWCCAPOVWTP_STR-WORKCENTERTYPECODE sy-vline 
WA_IWCCAPOVWTP_STR-CAPACITYCATEGORYALLOCATION sy-vline 
WA_IWCCAPOVWTP_STR-CAPACITYINTERNALID sy-vline 
WA_IWCCAPOVWTP_STR-LASTCHANGEDATETIME sy-vline 
WA_IWCCAPOVWTP_STR-PLANT sy-vline 
WA_IWCCAPOVWTP_STR-WORKCENTER sy-vline 
WA_IWCCAPOVWTP_STR-CAPACITYCATEGORYCODE sy-vline 
WA_IWCCAPOVWTP_STR-CAPACITY sy-vline 
WA_IWCCAPOVWTP_STR-CAPACITYACTIVEVERSION sy-vline 
WA_IWCCAPOVWTP_STR-WORKCENTERRESPONSIBLE sy-vline 
WA_IWCCAPOVWTP_STR-SHIFTTABLEHASCHANGED sy-vline 
WA_IWCCAPOVWTP_STR-CAPACITYLASTCHANGEDATETIME sy-vline      INTO ld_text SEPARATED BY SPACE.

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