ABAP Select data from SAP table CNV_21500_PCL2_WW_WDATE into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_21500_PCL2_WW_WDATE 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 CNV_21500_PCL2_WW_WDATE. 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 CNV_21500_PCL2_WW_WDATE 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_CNV_21500_PCL2_WW_WDATE TYPE STANDARD TABLE OF CNV_21500_PCL2_WW_WDATE,
      WA_CNV_21500_PCL2_WW_WDATE TYPE CNV_21500_PCL2_WW_WDATE,
      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: <CNV_21500_PCL2_WW_WDATE> TYPE CNV_21500_PCL2_WW_WDATE.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_21500_PCL2_WW_WDATE.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_21500_PCL2_WW_WDATE
  INTO TABLE IT_CNV_21500_PCL2_WW_WDATE.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_21500_PCL2_WW_WDATE
*  INTO TABLE @DATA(IT_CNV_21500_PCL2_WW_WDATE2).
*--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_CNV_21500_PCL2_WW_WDATE INDEX 1 INTO DATA(WA_CNV_21500_PCL2_WW_WDATE2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_21500_PCL2_WW_WDATE ASSIGNING <CNV_21500_PCL2_WW_WDATE>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_21500_PCL2_WW_WDATE>-PERNR = 1.
<CNV_21500_PCL2_WW_WDATE>-DAT01 = 1.
<CNV_21500_PCL2_WW_WDATE>-DAT02 = 1.
<CNV_21500_PCL2_WW_WDATE>-DAT03 = 1.
<CNV_21500_PCL2_WW_WDATE>-DAT04 = 1.

ENDLOOP.

LOOP AT IT_CNV_21500_PCL2_WW_WDATE INTO WA_CNV_21500_PCL2_WW_WDATE.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_21500_PCL2_WW_WDATE-BVECH, sy-vline,
  WA_CNV_21500_PCL2_WW_WDATE-MASSN, sy-vline,
  WA_CNV_21500_PCL2_WW_WDATE-MASSG, sy-vline,
  WA_CNV_21500_PCL2_WW_WDATE-XFIL, sy-vline,
  WA_CNV_21500_PCL2_WW_WDATE-DAT05, sy-vline,
  WA_CNV_21500_PCL2_WW_WDATE-DAT06, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_21500_PCL2_WW_WDATE 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_CNV_21500_PCL2_WW_WDATE 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_CNV_21500_PCL2_WW_WDATE INTO WA_CNV_21500_PCL2_WW_WDATE.


*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_CNV_21500_PCL2_WW_WDATE_STR, 
PERNR TYPE STRING,
DAT01 TYPE STRING,
DAT02 TYPE STRING,
DAT03 TYPE STRING,
DAT04 TYPE STRING,
BVECH TYPE STRING,
MASSN TYPE STRING,
MASSG TYPE STRING,
XFIL TYPE STRING,
DAT05 TYPE STRING,
DAT06 TYPE STRING,
DAT07 TYPE STRING,
DAT08 TYPE STRING,
DAT09 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_21500_PCL2_WW_WDATE_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_CNV_21500_PCL2_WW_WDATE_STR-PERNR sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT01 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT02 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT03 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT04 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-BVECH sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-MASSN sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-MASSG sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-XFIL sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT05 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT06 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT07 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT08 sy-vline 
WA_CNV_21500_PCL2_WW_WDATE_STR-DAT09 sy-vline      INTO ld_text SEPARATED BY SPACE.

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