ABAP Select data from SAP table CNV_PE_S_FIELD_INFO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_PE_S_FIELD_INFO 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_PE_S_FIELD_INFO. 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_PE_S_FIELD_INFO 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_PE_S_FIELD_INFO TYPE STANDARD TABLE OF CNV_PE_S_FIELD_INFO,
      WA_CNV_PE_S_FIELD_INFO TYPE CNV_PE_S_FIELD_INFO,
      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_PE_S_FIELD_INFO> TYPE CNV_PE_S_FIELD_INFO.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_PE_S_FIELD_INFO
*  INTO TABLE @DATA(IT_CNV_PE_S_FIELD_INFO2).
*--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_PE_S_FIELD_INFO INDEX 1 INTO DATA(WA_CNV_PE_S_FIELD_INFO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_PE_S_FIELD_INFO>-FIELDNAME = 1.
<CNV_PE_S_FIELD_INFO>-DOMNAME = 1.
<CNV_PE_S_FIELD_INFO>-ROLLNAME = 1.
<CNV_PE_S_FIELD_INFO>-DATATYPE = 1.
<CNV_PE_S_FIELD_INFO>-INTTYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_PE_S_FIELD_INFO-LENG, sy-vline,
  WA_CNV_PE_S_FIELD_INFO-DECIMALS, sy-vline,
  WA_CNV_PE_S_FIELD_INFO-COL_POS, sy-vline,
  WA_CNV_PE_S_FIELD_INFO-KEY, sy-vline,
  WA_CNV_PE_S_FIELD_INFO-ICON, sy-vline,
  WA_CNV_PE_S_FIELD_INFO-CHECKBOX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_PE_S_FIELD_INFO 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_PE_S_FIELD_INFO 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_PE_S_FIELD_INFO INTO WA_CNV_PE_S_FIELD_INFO.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_CNV_PE_S_FIELD_INFO-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CNV_PE_S_FIELD_INFO-DATATYPE.
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_PE_S_FIELD_INFO_STR, 
FIELDNAME TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
DATATYPE TYPE STRING,
INTTYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
COL_POS TYPE STRING,
KEY TYPE STRING,
ICON TYPE STRING,
CHECKBOX TYPE STRING,
TECH TYPE STRING,
NO_OUT TYPE STRING,
OUTPUTLEN TYPE STRING,
LOWERCASE TYPE STRING,
CONVEXIT TYPE STRING,
HOTSPOT TYPE STRING,
CFIELDNAME TYPE STRING,
TEXT TYPE STRING,
STXT TYPE STRING,
MTXT TYPE STRING,
LTXT TYPE STRING,
QFIELDNAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_PE_S_FIELD_INFO_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_PE_S_FIELD_INFO_STR-FIELDNAME sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-DOMNAME sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-ROLLNAME sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-DATATYPE sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-INTTYPE sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-LENG sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-DECIMALS sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-COL_POS sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-KEY sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-ICON sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-CHECKBOX sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-TECH sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-NO_OUT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-OUTPUTLEN sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-LOWERCASE sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-CONVEXIT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-HOTSPOT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-CFIELDNAME sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-TEXT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-STXT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-MTXT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-LTXT sy-vline 
WA_CNV_PE_S_FIELD_INFO_STR-QFIELDNAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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