ABAP Select data from SAP table USRCDT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM USRCDT
*  INTO TABLE @DATA(IT_USRCDT2).
*--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_USRCDT INDEX 1 INTO DATA(WA_USRCDT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<USRCDT>-BNAME = 1.
<USRCDT>-CHANGENR = 1.
<USRCDT>-USERNAME = 1.
<USRCDT>-NAME_FIRST = 1.
<USRCDT>-NAME_LAST = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_USRCDT-DEPARTMENT, sy-vline,
  WA_USRCDT-UDATE, sy-vline,
  WA_USRCDT-UTIME, sy-vline,
  WA_USRCDT-TCODE, sy-vline,
  WA_USRCDT-FNAME, sy-vline,
  WA_USRCDT-FTEXT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_USRCDT 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_USRCDT 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_USRCDT INTO WA_USRCDT.


*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 ALPHA, internal->external for field CHANGENR
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_USRCDT-CHANGENR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_USRCDT-CHANGENR.
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_USRCDT_STR, 
BNAME TYPE STRING,
CHANGENR TYPE STRING,
USERNAME TYPE STRING,
NAME_FIRST TYPE STRING,
NAME_LAST TYPE STRING,
DEPARTMENT TYPE STRING,
UDATE TYPE STRING,
UTIME TYPE STRING,
TCODE TYPE STRING,
FNAME TYPE STRING,
FTEXT TYPE STRING,
SCRTEXT_S TYPE STRING,
SCRTEXT_M TYPE STRING,
SCRTEXT_L TYPE STRING,
F_OLD TYPE STRING,
F_NEW TYPE STRING,
TABNAME TYPE STRING,
DDTEXT TYPE STRING,
TABKEY TYPE STRING,
CHNGIND TYPE STRING,
TEXT_CASE TYPE STRING,
TABKEY254 TYPE STRING,
EXT_KEYLEN TYPE STRING,END OF T_EKKO_STR.
DATA: WA_USRCDT_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_USRCDT_STR-BNAME sy-vline 
WA_USRCDT_STR-CHANGENR sy-vline 
WA_USRCDT_STR-USERNAME sy-vline 
WA_USRCDT_STR-NAME_FIRST sy-vline 
WA_USRCDT_STR-NAME_LAST sy-vline 
WA_USRCDT_STR-DEPARTMENT sy-vline 
WA_USRCDT_STR-UDATE sy-vline 
WA_USRCDT_STR-UTIME sy-vline 
WA_USRCDT_STR-TCODE sy-vline 
WA_USRCDT_STR-FNAME sy-vline 
WA_USRCDT_STR-FTEXT sy-vline 
WA_USRCDT_STR-SCRTEXT_S sy-vline 
WA_USRCDT_STR-SCRTEXT_M sy-vline 
WA_USRCDT_STR-SCRTEXT_L sy-vline 
WA_USRCDT_STR-F_OLD sy-vline 
WA_USRCDT_STR-F_NEW sy-vline 
WA_USRCDT_STR-TABNAME sy-vline 
WA_USRCDT_STR-DDTEXT sy-vline 
WA_USRCDT_STR-TABKEY sy-vline 
WA_USRCDT_STR-CHNGIND sy-vline 
WA_USRCDT_STR-TEXT_CASE sy-vline 
WA_USRCDT_STR-TABKEY254 sy-vline 
WA_USRCDT_STR-EXT_KEYLEN sy-vline      INTO ld_text SEPARATED BY SPACE.

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