ABAP Select data from SAP table CNV_RUNID into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_RUNID 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_RUNID. 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_RUNID 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_RUNID TYPE STANDARD TABLE OF CNV_RUNID,
      WA_CNV_RUNID TYPE CNV_RUNID,
      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_RUNID> TYPE CNV_RUNID.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_RUNID
*  INTO TABLE @DATA(IT_CNV_RUNID2).
*--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_RUNID INDEX 1 INTO DATA(WA_CNV_RUNID2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_RUNID>-MANDT = 1.
<CNV_RUNID>-RUNID = 1.
<CNV_RUNID>-RUNID_DESCR = 1.
<CNV_RUNID>-RSTAT = 1.
<CNV_RUNID>-SSTAT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_RUNID-PURPOSE, sy-vline,
  WA_CNV_RUNID-CREATED, sy-vline,
  WA_CNV_RUNID-CRDATE, sy-vline,
  WA_CNV_RUNID-CRTIME, sy-vline,
  WA_CNV_RUNID-CRUSER, sy-vline,
  WA_CNV_RUNID-CHANGED, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_RUNID 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_RUNID 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_RUNID INTO WA_CNV_RUNID.


*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_RUNID_STR, 
MANDT TYPE STRING,
RUNID TYPE STRING,
RUNID_DESCR TYPE STRING,
RSTAT TYPE STRING,
SSTAT TYPE STRING,
PURPOSE 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_RUNID_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_RUNID_STR-MANDT sy-vline 
WA_CNV_RUNID_STR-RUNID sy-vline 
WA_CNV_RUNID_STR-RUNID_DESCR sy-vline 
WA_CNV_RUNID_STR-RSTAT sy-vline 
WA_CNV_RUNID_STR-SSTAT sy-vline 
WA_CNV_RUNID_STR-PURPOSE sy-vline 
WA_CNV_RUNID_STR-CREATED sy-vline 
WA_CNV_RUNID_STR-CRDATE sy-vline 
WA_CNV_RUNID_STR-CRTIME sy-vline 
WA_CNV_RUNID_STR-CRUSER sy-vline 
WA_CNV_RUNID_STR-CHANGED sy-vline 
WA_CNV_RUNID_STR-CHDATE sy-vline 
WA_CNV_RUNID_STR-CHTIME sy-vline 
WA_CNV_RUNID_STR-CHUSER sy-vline 
WA_CNV_RUNID_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.