ABAP Select data from SAP table CNV_21500_PCL2_IF_PC20I into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CNV_21500_PCL2_IF_PC20I 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_21500_PCL2_IF_PC20I. 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_21500_PCL2_IF_PC20I 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_21500_PCL2_IF_PC20I TYPE STANDARD TABLE OF CNV_21500_PCL2_IF_PC20I,
      WA_CNV_21500_PCL2_IF_PC20I TYPE CNV_21500_PCL2_IF_PC20I,
      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_21500_PCL2_IF_PC20I> TYPE CNV_21500_PCL2_IF_PC20I.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CNV_21500_PCL2_IF_PC20I.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CNV_21500_PCL2_IF_PC20I
  INTO TABLE IT_CNV_21500_PCL2_IF_PC20I.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CNV_21500_PCL2_IF_PC20I
*  INTO TABLE @DATA(IT_CNV_21500_PCL2_IF_PC20I2).
*--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_21500_PCL2_IF_PC20I INDEX 1 INTO DATA(WA_CNV_21500_PCL2_IF_PC20I2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CNV_21500_PCL2_IF_PC20I ASSIGNING <CNV_21500_PCL2_IF_PC20I>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CNV_21500_PCL2_IF_PC20I>-ABZNR = 1.
<CNV_21500_PCL2_IF_PC20I>-ABART = 1.
<CNV_21500_PCL2_IF_PC20I>-APZNR = 1.
<CNV_21500_PCL2_IF_PC20I>-CNTR1 = 1.
<CNV_21500_PCL2_IF_PC20I>-CNTR2 = 1.

ENDLOOP.

LOOP AT IT_CNV_21500_PCL2_IF_PC20I INTO WA_CNV_21500_PCL2_IF_PC20I.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CNV_21500_PCL2_IF_PC20I-CNTR3, sy-vline,
  WA_CNV_21500_PCL2_IF_PC20I-ENDDA, sy-vline,
  WA_CNV_21500_PCL2_IF_PC20I-BEGDA, sy-vline,
  WA_CNV_21500_PCL2_IF_PC20I-VTKEN, sy-vline,
  WA_CNV_21500_PCL2_IF_PC20I-BEGUZ, sy-vline,
  WA_CNV_21500_PCL2_IF_PC20I-ENDUZ, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CNV_21500_PCL2_IF_PC20I 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_21500_PCL2_IF_PC20I 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_21500_PCL2_IF_PC20I INTO WA_CNV_21500_PCL2_IF_PC20I.


*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_21500_PCL2_IF_PC20I_STR, 
ABZNR TYPE STRING,
ABART TYPE STRING,
APZNR TYPE STRING,
CNTR1 TYPE STRING,
CNTR2 TYPE STRING,
CNTR3 TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
VTKEN TYPE STRING,
BEGUZ TYPE STRING,
ENDUZ TYPE STRING,
AWART TYPE STRING,
ABWTG TYPE STRING,
STDAZ TYPE STRING,
ABRTG TYPE STRING,
ABRST TYPE STRING,
KALTG TYPE STRING,
KENN1 TYPE STRING,
KENN2 TYPE STRING,
KLBEW TYPE STRING,
PSARB TYPE STRING,
OBEGD TYPE STRING,
OENDD TYPE STRING,
REFEX TYPE STRING,
ORDEX TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
SPRPS TYPE STRING,
SEQNR TYPE STRING,
ALLDF TYPE STRING,
HRSIF TYPE STRING,
OCABS TYPE STRING,
DOCNR TYPE STRING,
ALZNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CNV_21500_PCL2_IF_PC20I_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_21500_PCL2_IF_PC20I_STR-ABZNR sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ABART sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-APZNR sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-CNTR1 sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-CNTR2 sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-CNTR3 sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ENDDA sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-BEGDA sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-VTKEN sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-BEGUZ sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ENDUZ sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-AWART sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ABWTG sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-STDAZ sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ABRTG sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ABRST sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-KALTG sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-KENN1 sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-KENN2 sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-KLBEW sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-PSARB sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-OBEGD sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-OENDD sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-REFEX sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ORDEX sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-SUBTY sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-OBJPS sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-SPRPS sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-SEQNR sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ALLDF sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-HRSIF sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-OCABS sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-DOCNR sy-vline 
WA_CNV_21500_PCL2_IF_PC20I_STR-ALZNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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