ABAP Select data from SAP table DDICNVPREP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM DDICNVPREP
*  INTO TABLE @DATA(IT_DDICNVPREP2).
*--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_DDICNVPREP INDEX 1 INTO DATA(WA_DDICNVPREP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<DDICNVPREP>-ENTRYEX = 1.
<DDICNVPREP>-ICNVNT = 1.
<DDICNVPREP>-ICNVNTTR = 1.
<DDICNVPREP>-RESTTOCNV = 1.
<DDICNVPREP>-TABUNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_DDICNVPREP-TABUNTTR, sy-vline,
  WA_DDICNVPREP-DBCHK, sy-vline,
  WA_DDICNVPREP-LOCKED, sy-vline,
  WA_DDICNVPREP-GETCAND, sy-vline,
  WA_DDICNVPREP-VOLUMECHK, sy-vline,
  WA_DDICNVPREP-ACTNTCMP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_DDICNVPREP 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_DDICNVPREP 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_DDICNVPREP INTO WA_DDICNVPREP.


*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_DDICNVPREP_STR, 
ENTRYEX TYPE STRING,
ICNVNT TYPE STRING,
ICNVNTTR TYPE STRING,
RESTTOCNV TYPE STRING,
TABUNT TYPE STRING,
TABUNTTR TYPE STRING,
DBCHK TYPE STRING,
LOCKED TYPE STRING,
GETCAND TYPE STRING,
VOLUMECHK TYPE STRING,
ACTNTCMP TYPE STRING,
INACTNTCMP TYPE STRING,
ICNVINIT TYPE STRING,
ICNVSTART TYPE STRING,
ICNVENOUGH TYPE STRING,
ICNVCEXIST TYPE STRING,
HOT_LCP TYPE STRING,
MODIFIED TYPE STRING,
LONGNAME TYPE STRING,
CLASSRM TYPE STRING,
SORTTABS TYPE STRING,
IBUDEL TYPE STRING,
CANDMOVE TYPE STRING,
INITDONE TYPE STRING,
STARTED TYPE STRING,
ENOUGH TYPE STRING,
CANDEXIST TYPE STRING,
ICNVSTOP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_DDICNVPREP_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_DDICNVPREP_STR-ENTRYEX sy-vline 
WA_DDICNVPREP_STR-ICNVNT sy-vline 
WA_DDICNVPREP_STR-ICNVNTTR sy-vline 
WA_DDICNVPREP_STR-RESTTOCNV sy-vline 
WA_DDICNVPREP_STR-TABUNT sy-vline 
WA_DDICNVPREP_STR-TABUNTTR sy-vline 
WA_DDICNVPREP_STR-DBCHK sy-vline 
WA_DDICNVPREP_STR-LOCKED sy-vline 
WA_DDICNVPREP_STR-GETCAND sy-vline 
WA_DDICNVPREP_STR-VOLUMECHK sy-vline 
WA_DDICNVPREP_STR-ACTNTCMP sy-vline 
WA_DDICNVPREP_STR-INACTNTCMP sy-vline 
WA_DDICNVPREP_STR-ICNVINIT sy-vline 
WA_DDICNVPREP_STR-ICNVSTART sy-vline 
WA_DDICNVPREP_STR-ICNVENOUGH sy-vline 
WA_DDICNVPREP_STR-ICNVCEXIST sy-vline 
WA_DDICNVPREP_STR-HOT_LCP sy-vline 
WA_DDICNVPREP_STR-MODIFIED sy-vline 
WA_DDICNVPREP_STR-LONGNAME sy-vline 
WA_DDICNVPREP_STR-CLASSRM sy-vline 
WA_DDICNVPREP_STR-SORTTABS sy-vline 
WA_DDICNVPREP_STR-IBUDEL sy-vline 
WA_DDICNVPREP_STR-CANDMOVE sy-vline 
WA_DDICNVPREP_STR-INITDONE sy-vline 
WA_DDICNVPREP_STR-STARTED sy-vline 
WA_DDICNVPREP_STR-ENOUGH sy-vline 
WA_DDICNVPREP_STR-CANDEXIST sy-vline 
WA_DDICNVPREP_STR-ICNVSTOP sy-vline      INTO ld_text SEPARATED BY SPACE.

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