ABAP Select data from SAP table T457C into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T457C 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 T457C. 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 T457C 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_T457C TYPE STANDARD TABLE OF T457C,
      WA_T457C TYPE T457C,
      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: <T457C> TYPE T457C.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T457C.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T457C
  INTO TABLE IT_T457C.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T457C
*  INTO TABLE @DATA(IT_T457C2).
*--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_T457C INDEX 1 INTO DATA(WA_T457C2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T457C ASSIGNING <T457C>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T457C>-MANDT = 1.
<T457C>-TRGRP = 1.
<T457C>-DELKZ = 1.
<T457C>-SELKZ = 1.
<T457C>-TCODE = 1.

ENDLOOP.

LOOP AT IT_T457C INTO WA_T457C.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T457C-ANFBD, sy-vline,
  WA_T457C-FELD1, sy-vline,
  WA_T457C-FELD2, sy-vline,
  WA_T457C-FELD3, sy-vline,
  WA_T457C-PID01, sy-vline,
  WA_T457C-PID02, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T457C 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_T457C 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_T457C INTO WA_T457C.


*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_T457C_STR, 
MANDT TYPE STRING,
TRGRP TYPE STRING,
DELKZ TYPE STRING,
SELKZ TYPE STRING,
TCODE TYPE STRING,
ANFBD TYPE STRING,
FELD1 TYPE STRING,
FELD2 TYPE STRING,
FELD3 TYPE STRING,
PID01 TYPE STRING,
PID02 TYPE STRING,
PID03 TYPE STRING,
ROUTN TYPE STRING,
PID04 TYPE STRING,
PID05 TYPE STRING,
PID06 TYPE STRING,
FELD4 TYPE STRING,
FELD5 TYPE STRING,
FELD6 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T457C_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_T457C_STR-MANDT sy-vline 
WA_T457C_STR-TRGRP sy-vline 
WA_T457C_STR-DELKZ sy-vline 
WA_T457C_STR-SELKZ sy-vline 
WA_T457C_STR-TCODE sy-vline 
WA_T457C_STR-ANFBD sy-vline 
WA_T457C_STR-FELD1 sy-vline 
WA_T457C_STR-FELD2 sy-vline 
WA_T457C_STR-FELD3 sy-vline 
WA_T457C_STR-PID01 sy-vline 
WA_T457C_STR-PID02 sy-vline 
WA_T457C_STR-PID03 sy-vline 
WA_T457C_STR-ROUTN sy-vline 
WA_T457C_STR-PID04 sy-vline 
WA_T457C_STR-PID05 sy-vline 
WA_T457C_STR-PID06 sy-vline 
WA_T457C_STR-FELD4 sy-vline 
WA_T457C_STR-FELD5 sy-vline 
WA_T457C_STR-FELD6 sy-vline      INTO ld_text SEPARATED BY SPACE.

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