ABAP Select data from SAP table T457H into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T457H 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 T457H. 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 T457H 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_T457H TYPE STANDARD TABLE OF T457H,
      WA_T457H TYPE T457H,
      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: <T457H> TYPE T457H.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T457H.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T457H
  INTO TABLE IT_T457H.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T457H
*  INTO TABLE @DATA(IT_T457H2).
*--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_T457H INDEX 1 INTO DATA(WA_T457H2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T457H ASSIGNING <T457H>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T457H>-MANDT = 1.
<T457H>-MDPRF = 1.
<T457H>-DELIN = 1.
<T457H>-DELIS = 1.
<T457H>-DELEM = 1.

ENDLOOP.

LOOP AT IT_T457H INTO WA_T457H.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T457H-DELKZ, sy-vline,
  WA_T457H-PLUMI, sy-vline,
  WA_T457H-FIX01, sy-vline,
  WA_T457H-NOFIX, sy-vline,
  WA_T457H-BESKZ, sy-vline,
  WA_T457H-SOBSS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T457H 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_T457H 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_T457H INTO WA_T457H.


*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_T457H_STR, 
MANDT TYPE STRING,
MDPRF TYPE STRING,
DELIN TYPE STRING,
DELIS TYPE STRING,
DELEM TYPE STRING,
DELKZ TYPE STRING,
PLUMI TYPE STRING,
FIX01 TYPE STRING,
NOFIX TYPE STRING,
BESKZ TYPE STRING,
SOBSS TYPE STRING,
DESGN TYPE STRING,
LEAF_ TYPE STRING,
SIGN1 TYPE STRING,
INTAK TYPE STRING,
COLOR TYPE STRING,
TYPEC TYPE STRING,
SFSTK TYPE STRING,
SFCUM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T457H_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_T457H_STR-MANDT sy-vline 
WA_T457H_STR-MDPRF sy-vline 
WA_T457H_STR-DELIN sy-vline 
WA_T457H_STR-DELIS sy-vline 
WA_T457H_STR-DELEM sy-vline 
WA_T457H_STR-DELKZ sy-vline 
WA_T457H_STR-PLUMI sy-vline 
WA_T457H_STR-FIX01 sy-vline 
WA_T457H_STR-NOFIX sy-vline 
WA_T457H_STR-BESKZ sy-vline 
WA_T457H_STR-SOBSS sy-vline 
WA_T457H_STR-DESGN sy-vline 
WA_T457H_STR-LEAF_ sy-vline 
WA_T457H_STR-SIGN1 sy-vline 
WA_T457H_STR-INTAK sy-vline 
WA_T457H_STR-COLOR sy-vline 
WA_T457H_STR-TYPEC sy-vline 
WA_T457H_STR-SFSTK sy-vline 
WA_T457H_STR-SFCUM sy-vline      INTO ld_text SEPARATED BY SPACE.

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