ABAP Select data from SAP table CNV_00001_PARS into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_00001_PARS 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_00001_PARS. 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_00001_PARS 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_00001_PARS TYPE STANDARD TABLE OF CNV_00001_PARS,
      WA_CNV_00001_PARS TYPE CNV_00001_PARS,
      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_00001_PARS> TYPE CNV_00001_PARS.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_00001_PARS.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_00001_PARS
  INTO TABLE IT_CNV_00001_PARS.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_00001_PARS
*  INTO TABLE @DATA(IT_CNV_00001_PARS2).
*--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_00001_PARS INDEX 1 INTO DATA(WA_CNV_00001_PARS2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_00001_PARS ASSIGNING <CNV_00001_PARS>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_00001_PARS>-MANDT = 1.
<CNV_00001_PARS>-PACKID = 1.
<CNV_00001_PARS>-ROUTINE_NAME = 1.
<CNV_00001_PARS>-PACKID_SRC = 1.
<CNV_00001_PARS>-PARAM_NUM = 1.

ENDLOOP.

LOOP AT IT_CNV_00001_PARS INTO WA_CNV_00001_PARS.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_00001_PARS-PARAM_TYPE, sy-vline,
  WA_CNV_00001_PARS-PARAM_VALUE, sy-vline,
  WA_CNV_00001_PARS-HELP_DOCU, sy-vline,
  WA_CNV_00001_PARS-CREATED, sy-vline,
  WA_CNV_00001_PARS-CRDATE, sy-vline,
  WA_CNV_00001_PARS-CRTIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_00001_PARS 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_00001_PARS 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_00001_PARS INTO WA_CNV_00001_PARS.


*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_00001_PARS_STR, 
MANDT TYPE STRING,
PACKID TYPE STRING,
ROUTINE_NAME TYPE STRING,
PACKID_SRC TYPE STRING,
PARAM_NUM TYPE STRING,
PARAM_TYPE TYPE STRING,
PARAM_VALUE TYPE STRING,
HELP_DOCU TYPE STRING,
CREATED TYPE STRING,
CRDATE TYPE STRING,
CRTIME TYPE STRING,
CRUSER TYPE STRING,
CHANGED TYPE STRING,
CHDATE TYPE STRING,
CHTIME TYPE STRING,
CHUSER TYPE STRING,
SOURCE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_00001_PARS_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_00001_PARS_STR-MANDT sy-vline 
WA_CNV_00001_PARS_STR-PACKID sy-vline 
WA_CNV_00001_PARS_STR-ROUTINE_NAME sy-vline 
WA_CNV_00001_PARS_STR-PACKID_SRC sy-vline 
WA_CNV_00001_PARS_STR-PARAM_NUM sy-vline 
WA_CNV_00001_PARS_STR-PARAM_TYPE sy-vline 
WA_CNV_00001_PARS_STR-PARAM_VALUE sy-vline 
WA_CNV_00001_PARS_STR-HELP_DOCU sy-vline 
WA_CNV_00001_PARS_STR-CREATED sy-vline 
WA_CNV_00001_PARS_STR-CRDATE sy-vline 
WA_CNV_00001_PARS_STR-CRTIME sy-vline 
WA_CNV_00001_PARS_STR-CRUSER sy-vline 
WA_CNV_00001_PARS_STR-CHANGED sy-vline 
WA_CNV_00001_PARS_STR-CHDATE sy-vline 
WA_CNV_00001_PARS_STR-CHTIME sy-vline 
WA_CNV_00001_PARS_STR-CHUSER sy-vline 
WA_CNV_00001_PARS_STR-SOURCE sy-vline      INTO ld_text SEPARATED BY SPACE.

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