ABAP Select data from SAP table T442C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T442C 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 T442C. 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 T442C 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_T442C TYPE STANDARD TABLE OF T442C,
      WA_T442C TYPE T442C,
      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: <T442C> TYPE T442C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T442C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T442C
  INTO TABLE IT_T442C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T442C
*  INTO TABLE @DATA(IT_T442C2).
*--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_T442C INDEX 1 INTO DATA(WA_T442C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T442C ASSIGNING <T442C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T442C>-MANDT = 1.
<T442C>-KOKRS = 1.
<T442C>-VERSN = 1.
<T442C>-GJAHR = 1.
<T442C>-MRPC0 = 1.

ENDLOOP.

LOOP AT IT_T442C INTO WA_T442C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T442C-LFPCO, sy-vline,
  WA_T442C-SOPC0, sy-vline,
  WA_T442C-PLSCN, sy-vline,
  WA_T442C-VRSIO, sy-vline,
  WA_T442C-FLPGV, sy-vline,
  WA_T442C-LDATE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T442C 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_T442C 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_T442C INTO WA_T442C.


*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 VERSN
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_T442C-VERSN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T442C-VERSN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit GJAHR, internal->external for field GJAHR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_T442C-GJAHR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_T442C-GJAHR.
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_T442C_STR, 
MANDT TYPE STRING,
KOKRS TYPE STRING,
VERSN TYPE STRING,
GJAHR TYPE STRING,
MRPC0 TYPE STRING,
LFPCO TYPE STRING,
SOPC0 TYPE STRING,
PLSCN TYPE STRING,
VRSIO TYPE STRING,
FLPGV TYPE STRING,
LDATE TYPE STRING,
STYPE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T442C_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_T442C_STR-MANDT sy-vline 
WA_T442C_STR-KOKRS sy-vline 
WA_T442C_STR-VERSN sy-vline 
WA_T442C_STR-GJAHR sy-vline 
WA_T442C_STR-MRPC0 sy-vline 
WA_T442C_STR-LFPCO sy-vline 
WA_T442C_STR-SOPC0 sy-vline 
WA_T442C_STR-PLSCN sy-vline 
WA_T442C_STR-VRSIO sy-vline 
WA_T442C_STR-FLPGV sy-vline 
WA_T442C_STR-LDATE sy-vline 
WA_T442C_STR-STYPE sy-vline      INTO ld_text SEPARATED BY SPACE.

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