ABAP Select data from SAP table U_17202 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP U_17202 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 U_17202. 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 U_17202 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_U_17202 TYPE STANDARD TABLE OF U_17202,
      WA_U_17202 TYPE U_17202,
      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: <U_17202> TYPE U_17202.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_U_17202.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM U_17202
  INTO TABLE IT_U_17202.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM U_17202
*  INTO TABLE @DATA(IT_U_172022).
*--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_U_17202 INDEX 1 INTO DATA(WA_U_172022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_U_17202 ASSIGNING <U_17202>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<U_17202>-MANDT = 1.
<U_17202>-PERNR = 1.
<U_17202>-SUBTY = 1.
<U_17202>-OBJPS = 1.
<U_17202>-SPRPS = 1.

ENDLOOP.

LOOP AT IT_U_17202 INTO WA_U_17202.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_U_17202-ENDDA, sy-vline,
  WA_U_17202-BEGDA, sy-vline,
  WA_U_17202-SEQNR, sy-vline,
  WA_U_17202-AEDTM, sy-vline,
  WA_U_17202-UNAME, sy-vline,
  WA_U_17202-PREAS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_U_17202 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_U_17202 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_U_17202 INTO WA_U_17202.


*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_U_17202_STR, 
MANDT TYPE STRING,
PERNR TYPE STRING,
SUBTY TYPE STRING,
OBJPS TYPE STRING,
SPRPS TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SEQNR TYPE STRING,
AEDTM TYPE STRING,
UNAME TYPE STRING,
PREAS TYPE STRING,
BWNAM TYPE STRING,
DAT25 TYPE STRING,
LWKJN TYPE STRING,
KENJN TYPE STRING,
GRPNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_U_17202_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_U_17202_STR-MANDT sy-vline 
WA_U_17202_STR-PERNR sy-vline 
WA_U_17202_STR-SUBTY sy-vline 
WA_U_17202_STR-OBJPS sy-vline 
WA_U_17202_STR-SPRPS sy-vline 
WA_U_17202_STR-ENDDA sy-vline 
WA_U_17202_STR-BEGDA sy-vline 
WA_U_17202_STR-SEQNR sy-vline 
WA_U_17202_STR-AEDTM sy-vline 
WA_U_17202_STR-UNAME sy-vline 
WA_U_17202_STR-PREAS sy-vline 
WA_U_17202_STR-BWNAM sy-vline 
WA_U_17202_STR-DAT25 sy-vline 
WA_U_17202_STR-LWKJN sy-vline 
WA_U_17202_STR-KENJN sy-vline 
WA_U_17202_STR-GRPNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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