ABAP Select data from SAP table ICNVPERF into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ICNVPERF
*  INTO TABLE @DATA(IT_ICNVPERF2).
*--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_ICNVPERF INDEX 1 INTO DATA(WA_ICNVPERF2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ICNVPERF>-TABNAME = 1.
<ICNVPERF>-UNDEF1 = 1.
<ICNVPERF>-TOTAL = 1.
<ICNVPERF>-CONVERTED = 1.
<ICNVPERF>-CONVERTEDE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ICNVPERF-PERCENT, sy-vline,
  WA_ICNVPERF-PERCENTE, sy-vline,
  WA_ICNVPERF-PROMILLE, sy-vline,
  WA_ICNVPERF-PROMILLEE, sy-vline,
  WA_ICNVPERF-RUNTIMED, sy-vline,
  WA_ICNVPERF-RUNTIMEH, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ICNVPERF 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_ICNVPERF 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_ICNVPERF INTO WA_ICNVPERF.


*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_ICNVPERF_STR, 
TABNAME TYPE STRING,
UNDEF1 TYPE STRING,
TOTAL TYPE STRING,
CONVERTED TYPE STRING,
CONVERTEDE TYPE STRING,
PERCENT TYPE STRING,
PERCENTE TYPE STRING,
PROMILLE TYPE STRING,
PROMILLEE TYPE STRING,
RUNTIMED TYPE STRING,
RUNTIMEH TYPE STRING,
RUNTIMEM TYPE STRING,
RUNTIMES TYPE STRING,
UNDEF2 TYPE STRING,
ROW_PERMIN TYPE STRING,
PROCTIMED TYPE STRING,
PROCTIMEH TYPE STRING,
PROCTIMEM TYPE STRING,
PROCTIMES TYPE STRING,
ESTTIMED TYPE STRING,
ESTTIMEH TYPE STRING,
ESTTIMEM TYPE STRING,
ESTTIMES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ICNVPERF_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_ICNVPERF_STR-TABNAME sy-vline 
WA_ICNVPERF_STR-UNDEF1 sy-vline 
WA_ICNVPERF_STR-TOTAL sy-vline 
WA_ICNVPERF_STR-CONVERTED sy-vline 
WA_ICNVPERF_STR-CONVERTEDE sy-vline 
WA_ICNVPERF_STR-PERCENT sy-vline 
WA_ICNVPERF_STR-PERCENTE sy-vline 
WA_ICNVPERF_STR-PROMILLE sy-vline 
WA_ICNVPERF_STR-PROMILLEE sy-vline 
WA_ICNVPERF_STR-RUNTIMED sy-vline 
WA_ICNVPERF_STR-RUNTIMEH sy-vline 
WA_ICNVPERF_STR-RUNTIMEM sy-vline 
WA_ICNVPERF_STR-RUNTIMES sy-vline 
WA_ICNVPERF_STR-UNDEF2 sy-vline 
WA_ICNVPERF_STR-ROW_PERMIN sy-vline 
WA_ICNVPERF_STR-PROCTIMED sy-vline 
WA_ICNVPERF_STR-PROCTIMEH sy-vline 
WA_ICNVPERF_STR-PROCTIMEM sy-vline 
WA_ICNVPERF_STR-PROCTIMES sy-vline 
WA_ICNVPERF_STR-ESTTIMED sy-vline 
WA_ICNVPERF_STR-ESTTIMEH sy-vline 
WA_ICNVPERF_STR-ESTTIMEM sy-vline 
WA_ICNVPERF_STR-ESTTIMES sy-vline      INTO ld_text SEPARATED BY SPACE.

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