ABAP Select data from SAP table CNV_10020_LOG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_10020_LOG 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_10020_LOG. 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_10020_LOG 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_10020_LOG TYPE STANDARD TABLE OF CNV_10020_LOG,
      WA_CNV_10020_LOG TYPE CNV_10020_LOG,
      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_10020_LOG> TYPE CNV_10020_LOG.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_10020_LOG.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_10020_LOG
  INTO TABLE IT_CNV_10020_LOG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_10020_LOG
*  INTO TABLE @DATA(IT_CNV_10020_LOG2).
*--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_10020_LOG INDEX 1 INTO DATA(WA_CNV_10020_LOG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_10020_LOG ASSIGNING <CNV_10020_LOG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_10020_LOG>-MANDT = 1.
<CNV_10020_LOG>-PACKID = 1.
<CNV_10020_LOG>-TABNAME = 1.
<CNV_10020_LOG>-FIELDNAME = 1.
<CNV_10020_LOG>-COMPNAME = 1.

ENDLOOP.

LOOP AT IT_CNV_10020_LOG INTO WA_CNV_10020_LOG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_10020_LOG-CNUMBER, sy-vline,
  WA_CNV_10020_LOG-EVALUATION, sy-vline,
  WA_CNV_10020_LOG-PARAM1, sy-vline,
  WA_CNV_10020_LOG-PARAM2, sy-vline,
  WA_CNV_10020_LOG-PARAM3, sy-vline,
  WA_CNV_10020_LOG-PARAM4, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_10020_LOG 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_10020_LOG 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_10020_LOG INTO WA_CNV_10020_LOG.


*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 CNVO6, internal->external for field EVALUATION
CALL FUNCTION 'CONVERSION_EXIT_CNVO6_OUTPUT'
  EXPORTING
    input =                      WA_CNV_10020_LOG-EVALUATION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_10020_LOG-EVALUATION.
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_CNV_10020_LOG_STR, 
MANDT TYPE STRING,
PACKID TYPE STRING,
TABNAME TYPE STRING,
FIELDNAME TYPE STRING,
COMPNAME TYPE STRING,
CNUMBER TYPE STRING,
EVALUATION TYPE STRING,
PARAM1 TYPE STRING,
PARAM2 TYPE STRING,
PARAM3 TYPE STRING,
PARAM4 TYPE STRING,
ITR_VALUE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_10020_LOG_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_10020_LOG_STR-MANDT sy-vline 
WA_CNV_10020_LOG_STR-PACKID sy-vline 
WA_CNV_10020_LOG_STR-TABNAME sy-vline 
WA_CNV_10020_LOG_STR-FIELDNAME sy-vline 
WA_CNV_10020_LOG_STR-COMPNAME sy-vline 
WA_CNV_10020_LOG_STR-CNUMBER sy-vline 
WA_CNV_10020_LOG_STR-EVALUATION sy-vline 
WA_CNV_10020_LOG_STR-PARAM1 sy-vline 
WA_CNV_10020_LOG_STR-PARAM2 sy-vline 
WA_CNV_10020_LOG_STR-PARAM3 sy-vline 
WA_CNV_10020_LOG_STR-PARAM4 sy-vline 
WA_CNV_10020_LOG_STR-ITR_VALUE sy-vline      INTO ld_text SEPARATED BY SPACE.

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