ABAP Select data from SAP table T351P_OLD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T351P_OLD 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 T351P_OLD. 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 T351P_OLD 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_T351P_OLD TYPE STANDARD TABLE OF T351P_OLD,
      WA_T351P_OLD TYPE T351P_OLD,
      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: <T351P_OLD> TYPE T351P_OLD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T351P_OLD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T351P_OLD
  INTO TABLE IT_T351P_OLD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T351P_OLD
*  INTO TABLE @DATA(IT_T351P_OLD2).
*--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_T351P_OLD INDEX 1 INTO DATA(WA_T351P_OLD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T351P_OLD ASSIGNING <T351P_OLD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T351P_OLD>-MANDT = 1.
<T351P_OLD>-STRAT = 1.
<T351P_OLD>-ZAEHL = 1.
<T351P_OLD>-ZEIEH = 1.
<T351P_OLD>-LEIEH = 1.

ENDLOOP.

LOOP AT IT_T351P_OLD INTO WA_T351P_OLD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T351P_OLD-ZYKZT, sy-vline,
  WA_T351P_OLD-ZYKLS, sy-vline,
  WA_T351P_OLD-OFFZT, sy-vline,
  WA_T351P_OLD-OFFLS, sy-vline,
  WA_T351P_OLD-HIERA, sy-vline,
  WA_T351P_OLD-PUFFP, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T351P_OLD 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_T351P_OLD 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_T351P_OLD INTO WA_T351P_OLD.


*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 CUNIT, internal->external for field ZEIEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_T351P_OLD-ZEIEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T351P_OLD-ZEIEH.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LEIEH
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_T351P_OLD-LEIEH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T351P_OLD-LEIEH.
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_T351P_OLD_STR, 
MANDT TYPE STRING,
STRAT TYPE STRING,
ZAEHL TYPE STRING,
ZEIEH TYPE STRING,
LEIEH TYPE STRING,
ZYKZT TYPE STRING,
ZYKLS TYPE STRING,
OFFZT TYPE STRING,
OFFLS TYPE STRING,
HIERA TYPE STRING,
PUFFP TYPE STRING,
PUFFN TYPE STRING,
PERKN TYPE STRING,
EROEF TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T351P_OLD_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_T351P_OLD_STR-MANDT sy-vline 
WA_T351P_OLD_STR-STRAT sy-vline 
WA_T351P_OLD_STR-ZAEHL sy-vline 
WA_T351P_OLD_STR-ZEIEH sy-vline 
WA_T351P_OLD_STR-LEIEH sy-vline 
WA_T351P_OLD_STR-ZYKZT sy-vline 
WA_T351P_OLD_STR-ZYKLS sy-vline 
WA_T351P_OLD_STR-OFFZT sy-vline 
WA_T351P_OLD_STR-OFFLS sy-vline 
WA_T351P_OLD_STR-HIERA sy-vline 
WA_T351P_OLD_STR-PUFFP sy-vline 
WA_T351P_OLD_STR-PUFFN sy-vline 
WA_T351P_OLD_STR-PERKN sy-vline 
WA_T351P_OLD_STR-EROEF sy-vline      INTO ld_text SEPARATED BY SPACE.

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