ABAP Select data from SAP table CNVPERFDEMAND into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNVPERFDEMAND
*  INTO TABLE @DATA(IT_CNVPERFDEMAND2).
*--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_CNVPERFDEMAND INDEX 1 INTO DATA(WA_CNVPERFDEMAND2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNVPERFDEMAND>-MANDT = 1.
<CNVPERFDEMAND>-DB = 1.
<CNVPERFDEMAND>-SCENARIO = 1.
<CNVPERFDEMAND>-LFDNR = 1.
<CNVPERFDEMAND>-DEMAND_CPU = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNVPERFDEMAND-DEMAND_IO, sy-vline,
  WA_CNVPERFDEMAND-DEMAND_MEM, sy-vline,
  WA_CNVPERFDEMAND-DEMAND_ROLL, sy-vline,
  WA_CNVPERFDEMAND-KEYCHANGE, sy-vline,
  WA_CNVPERFDEMAND-COPYROWS, sy-vline,
  WA_CNVPERFDEMAND-MULTICOPY, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNVPERFDEMAND 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_CNVPERFDEMAND 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_CNVPERFDEMAND INTO WA_CNVPERFDEMAND.


*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_CNVPERFDEMAND_STR, 
MANDT TYPE STRING,
DB TYPE STRING,
SCENARIO TYPE STRING,
LFDNR TYPE STRING,
DEMAND_CPU TYPE STRING,
DEMAND_IO TYPE STRING,
DEMAND_MEM TYPE STRING,
DEMAND_ROLL TYPE STRING,
KEYCHANGE TYPE STRING,
COPYROWS TYPE STRING,
MULTICOPY TYPE STRING,
KEYCHVIEWS TYPE STRING,
NO_SMUP TYPE STRING,
SUMUP_S TYPE STRING,
SUMUP_A TYPE STRING,
SUMUP_P TYPE STRING,
SUMUP_G TYPE STRING,
PRIO TYPE STRING,
AGGREGATE TYPE STRING,
TRANSPARENT TYPE STRING,
CLIDEPENDENT TYPE STRING,
CLIENTCHANGE TYPE STRING,
VIEW_USED TYPE STRING,
NOVIEW TYPE STRING,
ROWIDVIEW TYPE STRING,
ORGDELETE TYPE STRING,
ORGDEPENDENT TYPE STRING,
CLUSTER_TAB TYPE STRING,
DROPINSERT TYPE STRING,
HR_MAKROS TYPE STRING,
SELECTION TYPE STRING,
DELETION TYPE STRING,
SINGLERECPROC TYPE STRING,
ARRAYRECPROC TYPE STRING,
LASTRECPROC TYPE STRING,
ENDPROCDUM TYPE STRING,
BESCHREIBUNG TYPE STRING,
FLDMAP TYPE STRING,
ICWB_SCENARIO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNVPERFDEMAND_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_CNVPERFDEMAND_STR-MANDT sy-vline 
WA_CNVPERFDEMAND_STR-DB sy-vline 
WA_CNVPERFDEMAND_STR-SCENARIO sy-vline 
WA_CNVPERFDEMAND_STR-LFDNR sy-vline 
WA_CNVPERFDEMAND_STR-DEMAND_CPU sy-vline 
WA_CNVPERFDEMAND_STR-DEMAND_IO sy-vline 
WA_CNVPERFDEMAND_STR-DEMAND_MEM sy-vline 
WA_CNVPERFDEMAND_STR-DEMAND_ROLL sy-vline 
WA_CNVPERFDEMAND_STR-KEYCHANGE sy-vline 
WA_CNVPERFDEMAND_STR-COPYROWS sy-vline 
WA_CNVPERFDEMAND_STR-MULTICOPY sy-vline 
WA_CNVPERFDEMAND_STR-KEYCHVIEWS sy-vline 
WA_CNVPERFDEMAND_STR-NO_SMUP sy-vline 
WA_CNVPERFDEMAND_STR-SUMUP_S sy-vline 
WA_CNVPERFDEMAND_STR-SUMUP_A sy-vline 
WA_CNVPERFDEMAND_STR-SUMUP_P sy-vline 
WA_CNVPERFDEMAND_STR-SUMUP_G sy-vline 
WA_CNVPERFDEMAND_STR-PRIO sy-vline 
WA_CNVPERFDEMAND_STR-AGGREGATE sy-vline 
WA_CNVPERFDEMAND_STR-TRANSPARENT sy-vline 
WA_CNVPERFDEMAND_STR-CLIDEPENDENT sy-vline 
WA_CNVPERFDEMAND_STR-CLIENTCHANGE sy-vline 
WA_CNVPERFDEMAND_STR-VIEW_USED sy-vline 
WA_CNVPERFDEMAND_STR-NOVIEW sy-vline 
WA_CNVPERFDEMAND_STR-ROWIDVIEW sy-vline 
WA_CNVPERFDEMAND_STR-ORGDELETE sy-vline 
WA_CNVPERFDEMAND_STR-ORGDEPENDENT sy-vline 
WA_CNVPERFDEMAND_STR-CLUSTER_TAB sy-vline 
WA_CNVPERFDEMAND_STR-DROPINSERT sy-vline 
WA_CNVPERFDEMAND_STR-HR_MAKROS sy-vline 
WA_CNVPERFDEMAND_STR-SELECTION sy-vline 
WA_CNVPERFDEMAND_STR-DELETION sy-vline 
WA_CNVPERFDEMAND_STR-SINGLERECPROC sy-vline 
WA_CNVPERFDEMAND_STR-ARRAYRECPROC sy-vline 
WA_CNVPERFDEMAND_STR-LASTRECPROC sy-vline 
WA_CNVPERFDEMAND_STR-ENDPROCDUM sy-vline 
WA_CNVPERFDEMAND_STR-BESCHREIBUNG sy-vline 
WA_CNVPERFDEMAND_STR-FLDMAP sy-vline 
WA_CNVPERFDEMAND_STR-ICWB_SCENARIO sy-vline      INTO ld_text SEPARATED BY SPACE.

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