ABAP Select data from SAP table PCRVCONST into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PCRVCONST
*  INTO TABLE @DATA(IT_PCRVCONST2).
*--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_PCRVCONST INDEX 1 INTO DATA(WA_PCRVCONST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PCRVCONST>-DUMMY = 1.
<PCRVCONST>-CONSTANT0 = 1.
<PCRVCONST>-CONSTANT1 = 1.
<PCRVCONST>-CONSTANT2 = 1.
<PCRVCONST>-CONSTANT3 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PCRVCONST-CONSTANT4, sy-vline,
  WA_PCRVCONST-CONSTANTHYPHEN, sy-vline,
  WA_PCRVCONST-CONSTANTRAW, sy-vline,
  WA_PCRVCONST-CONSTANTEMPTY, sy-vline,
  WA_PCRVCONST-CONSTANTTRUE, sy-vline,
  WA_PCRVCONST-CONSTANTFALSE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PCRVCONST 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_PCRVCONST 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_PCRVCONST INTO WA_PCRVCONST.


*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_PCRVCONST_STR, 
DUMMY TYPE STRING,
CONSTANT0 TYPE STRING,
CONSTANT1 TYPE STRING,
CONSTANT2 TYPE STRING,
CONSTANT3 TYPE STRING,
CONSTANT4 TYPE STRING,
CONSTANTHYPHEN TYPE STRING,
CONSTANTRAW TYPE STRING,
CONSTANTEMPTY TYPE STRING,
CONSTANTTRUE TYPE STRING,
CONSTANTFALSE TYPE STRING,
CONSTANTNOTEXISTING TYPE STRING,
CONSTANTMIXTURE TYPE STRING,
CONSTANTINPROGRESS TYPE STRING,
CONSTANTRELEASED TYPE STRING,
CONSTANTCALCULATED TYPE STRING,
CONSTANTOUTDATED TYPE STRING,
CONSTANTCOMPSTATFORRELEASE TYPE STRING,
CONSTANTCOMPSTATNEW TYPE STRING,
CONSTANT01 TYPE STRING,
CONSTANT02 TYPE STRING,
CONSTANT03 TYPE STRING,
CONSTANTNEW TYPE STRING,
CONSTANTACTIVE TYPE STRING,
CONSTANTUPDATED TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PCRVCONST_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_PCRVCONST_STR-DUMMY sy-vline 
WA_PCRVCONST_STR-CONSTANT0 sy-vline 
WA_PCRVCONST_STR-CONSTANT1 sy-vline 
WA_PCRVCONST_STR-CONSTANT2 sy-vline 
WA_PCRVCONST_STR-CONSTANT3 sy-vline 
WA_PCRVCONST_STR-CONSTANT4 sy-vline 
WA_PCRVCONST_STR-CONSTANTHYPHEN sy-vline 
WA_PCRVCONST_STR-CONSTANTRAW sy-vline 
WA_PCRVCONST_STR-CONSTANTEMPTY sy-vline 
WA_PCRVCONST_STR-CONSTANTTRUE sy-vline 
WA_PCRVCONST_STR-CONSTANTFALSE sy-vline 
WA_PCRVCONST_STR-CONSTANTNOTEXISTING sy-vline 
WA_PCRVCONST_STR-CONSTANTMIXTURE sy-vline 
WA_PCRVCONST_STR-CONSTANTINPROGRESS sy-vline 
WA_PCRVCONST_STR-CONSTANTRELEASED sy-vline 
WA_PCRVCONST_STR-CONSTANTCALCULATED sy-vline 
WA_PCRVCONST_STR-CONSTANTOUTDATED sy-vline 
WA_PCRVCONST_STR-CONSTANTCOMPSTATFORRELEASE sy-vline 
WA_PCRVCONST_STR-CONSTANTCOMPSTATNEW sy-vline 
WA_PCRVCONST_STR-CONSTANT01 sy-vline 
WA_PCRVCONST_STR-CONSTANT02 sy-vline 
WA_PCRVCONST_STR-CONSTANT03 sy-vline 
WA_PCRVCONST_STR-CONSTANTNEW sy-vline 
WA_PCRVCONST_STR-CONSTANTACTIVE sy-vline 
WA_PCRVCONST_STR-CONSTANTUPDATED sy-vline      INTO ld_text SEPARATED BY SPACE.

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