ABAP Select data from SAP table V_CMPERSIN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM V_CMPERSIN
*  INTO TABLE @DATA(IT_V_CMPERSIN2).
*--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_V_CMPERSIN INDEX 1 INTO DATA(WA_V_CMPERSIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<V_CMPERSIN>-SCRNID = 1.
<V_CMPERSIN>-FIELDNAME = 1.
<V_CMPERSIN>-APPLID = 1.
<V_CMPERSIN>-FIELDTYPE = 1.
<V_CMPERSIN>-LISTFLAG = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_V_CMPERSIN-TECHFLAG, sy-vline,
  WA_V_CMPERSIN-SCRFLD, sy-vline,
  WA_V_CMPERSIN-SCRFLDTO, sy-vline,
  WA_V_CMPERSIN-TABSID, sy-vline,
  WA_V_CMPERSIN-ZEROFLAG, sy-vline,
  WA_V_CMPERSIN-REFTAB, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_V_CMPERSIN 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_V_CMPERSIN 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_V_CMPERSIN INTO WA_V_CMPERSIN.


*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_V_CMPERSIN_STR, 
SCRNID TYPE STRING,
FIELDNAME TYPE STRING,
APPLID TYPE STRING,
FIELDTYPE TYPE STRING,
LISTFLAG TYPE STRING,
TECHFLAG TYPE STRING,
SCRFLD TYPE STRING,
SCRFLDTO TYPE STRING,
TABSID TYPE STRING,
ZEROFLAG TYPE STRING,
REFTAB TYPE STRING,
REFFLD TYPE STRING,
DDICFLD TYPE STRING,
MEMID TYPE STRING,
MEMID_TO TYPE STRING,
DISPFLAG TYPE STRING,
SCRFLDID TYPE STRING,
NAVIGFLG TYPE STRING,
NAVI_EXIT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_V_CMPERSIN_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_V_CMPERSIN_STR-SCRNID sy-vline 
WA_V_CMPERSIN_STR-FIELDNAME sy-vline 
WA_V_CMPERSIN_STR-APPLID sy-vline 
WA_V_CMPERSIN_STR-FIELDTYPE sy-vline 
WA_V_CMPERSIN_STR-LISTFLAG sy-vline 
WA_V_CMPERSIN_STR-TECHFLAG sy-vline 
WA_V_CMPERSIN_STR-SCRFLD sy-vline 
WA_V_CMPERSIN_STR-SCRFLDTO sy-vline 
WA_V_CMPERSIN_STR-TABSID sy-vline 
WA_V_CMPERSIN_STR-ZEROFLAG sy-vline 
WA_V_CMPERSIN_STR-REFTAB sy-vline 
WA_V_CMPERSIN_STR-REFFLD sy-vline 
WA_V_CMPERSIN_STR-DDICFLD sy-vline 
WA_V_CMPERSIN_STR-MEMID sy-vline 
WA_V_CMPERSIN_STR-MEMID_TO sy-vline 
WA_V_CMPERSIN_STR-DISPFLAG sy-vline 
WA_V_CMPERSIN_STR-SCRFLDID sy-vline 
WA_V_CMPERSIN_STR-NAVIGFLG sy-vline 
WA_V_CMPERSIN_STR-NAVI_EXIT sy-vline      INTO ld_text SEPARATED BY SPACE.

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