ABAP Select data from SAP table /TDAG/RCSS_KEY_REG_LEGREG into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /TDAG/RCSS_KEY_REG_LEGREG 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 /TDAG/RCSS_KEY_REG_LEGREG. 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 /TDAG/RCSS_KEY_REG_LEGREG 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_/TDAG/RCSS_KEY_REG_LEGREG TYPE STANDARD TABLE OF /TDAG/RCSS_KEY_REG_LEGREG,
      WA_/TDAG/RCSS_KEY_REG_LEGREG TYPE /TDAG/RCSS_KEY_REG_LEGREG,
      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: </TDAG/RCSS_KEY_REG_LEGREG> TYPE /TDAG/RCSS_KEY_REG_LEGREG.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /TDAG/RCSS_KEY_REG_LEGREG
  INTO TABLE IT_/TDAG/RCSS_KEY_REG_LEGREG.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /TDAG/RCSS_KEY_REG_LEGREG
*  INTO TABLE @DATA(IT_/TDAG/RCSS_KEY_REG_LEGREG2).
*--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_/TDAG/RCSS_KEY_REG_LEGREG INDEX 1 INTO DATA(WA_/TDAG/RCSS_KEY_REG_LEGREG2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/TDAG/RCSS_KEY_REG_LEGREG ASSIGNING </TDAG/RCSS_KEY_REG_LEGREG>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</TDAG/RCSS_KEY_REG_LEGREG>-RECN = 1.
</TDAG/RCSS_KEY_REG_LEGREG>-LGENT_CODE = 1.
</TDAG/RCSS_KEY_REG_LEGREG>-REGTYPE = 1.
</TDAG/RCSS_KEY_REG_LEGREG>-REGNO = 1.
</TDAG/RCSS_KEY_REG_LEGREG>-SUBMISSIONNO = 1.

ENDLOOP.

LOOP AT IT_/TDAG/RCSS_KEY_REG_LEGREG INTO WA_/TDAG/RCSS_KEY_REG_LEGREG.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/TDAG/RCSS_KEY_REG_LEGREG-TOBAND_CODE, sy-vline,
  WA_/TDAG/RCSS_KEY_REG_LEGREG-INTDEADLINE, sy-vline,
  WA_/TDAG/RCSS_KEY_REG_LEGREG-REGDEADLINE, sy-vline,
  WA_/TDAG/RCSS_KEY_REG_LEGREG-STATUS, sy-vline,
  WA_/TDAG/RCSS_KEY_REG_LEGREG-STATUSJUST, sy-vline,
  WA_/TDAG/RCSS_KEY_REG_LEGREG-DONAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/TDAG/RCSS_KEY_REG_LEGREG 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_/TDAG/RCSS_KEY_REG_LEGREG 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_/TDAG/RCSS_KEY_REG_LEGREG INTO WA_/TDAG/RCSS_KEY_REG_LEGREG.


*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 RECN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_KEY_REG_LEGREG-RECN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_KEY_REG_LEGREG-RECN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field THIRDPARTYBP_CODE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_KEY_REG_LEGREG-THIRDPARTYBP_CODE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_KEY_REG_LEGREG-THIRDPARTYBP_CODE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field THIRDPARTYC_CODE
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_KEY_REG_LEGREG-THIRDPARTYC_CODE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_KEY_REG_LEGREG-THIRDPARTYC_CODE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CHRI3, internal->external for field MILES_RISK_PHRID
CALL FUNCTION 'CONVERSION_EXIT_CHRI3_OUTPUT'
  EXPORTING
    input =                      WA_/TDAG/RCSS_KEY_REG_LEGREG-MILES_RISK_PHRID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/TDAG/RCSS_KEY_REG_LEGREG-MILES_RISK_PHRID.
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_/TDAG/RCSS_KEY_REG_LEGREG_STR, 
RECN TYPE STRING,
LGENT_CODE TYPE STRING,
REGTYPE TYPE STRING,
REGNO TYPE STRING,
SUBMISSIONNO TYPE STRING,
TOBAND_CODE TYPE STRING,
INTDEADLINE TYPE STRING,
REGDEADLINE TYPE STRING,
STATUS TYPE STRING,
STATUSJUST TYPE STRING,
DONAME TYPE STRING,
REGREVIEW TYPE STRING,
DMSLINK TYPE STRING,
REMARK TYPE STRING,
REP_LGENT_CODE TYPE STRING,
ROLE_TWD_ECHA TYPE STRING,
PROJECT_NO TYPE STRING,
THIRDPARTYBP_CODE TYPE STRING,
THIRDPARTYLE_CODE TYPE STRING,
THIRDPARTYC_CODE TYPE STRING,
MILESTONE_CODE TYPE STRING,
MILES_STATUS TYPE STRING,
MILES_DEADL TYPE STRING,
MILES_FLG_REM TYPE STRING,
MILES_REMARK TYPE STRING,
MILES_RISK_CATPIN TYPE STRING,
MILES_RISK_PHRID TYPE STRING,
MILES_LINK TYPE STRING,
MILES_DMS_LINK TYPE STRING,
MILESTONE_ORDER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/TDAG/RCSS_KEY_REG_LEGREG_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_/TDAG/RCSS_KEY_REG_LEGREG_STR-RECN sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-LGENT_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-REGTYPE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-REGNO sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-SUBMISSIONNO sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-TOBAND_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-INTDEADLINE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-REGDEADLINE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-STATUS sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-STATUSJUST sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-DONAME sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-REGREVIEW sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-DMSLINK sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-REMARK sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-REP_LGENT_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-ROLE_TWD_ECHA sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-PROJECT_NO sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-THIRDPARTYBP_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-THIRDPARTYLE_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-THIRDPARTYC_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILESTONE_CODE sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_STATUS sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_DEADL sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_FLG_REM sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_REMARK sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_RISK_CATPIN sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_RISK_PHRID sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_LINK sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILES_DMS_LINK sy-vline 
WA_/TDAG/RCSS_KEY_REG_LEGREG_STR-MILESTONE_ORDER sy-vline      INTO ld_text SEPARATED BY SPACE.

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