ABAP Select data from SAP table T343J into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T343J 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 T343J. 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 T343J 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_T343J TYPE STANDARD TABLE OF T343J,
      WA_T343J TYPE T343J,
      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: <T343J> TYPE T343J.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T343J.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T343J
  INTO TABLE IT_T343J.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T343J
*  INTO TABLE @DATA(IT_T343J2).
*--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_T343J INDEX 1 INTO DATA(WA_T343J2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T343J ASSIGNING <T343J>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T343J>-MANDT = 1.
<T343J>-LGNUM = 1.
<T343J>-LGTYP = 1.
<T343J>-STE01 = 1.
<T343J>-STE02 = 1.

ENDLOOP.

LOOP AT IT_T343J INTO WA_T343J.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T343J-STE03, sy-vline,
  WA_T343J-STE04, sy-vline,
  WA_T343J-STE05, sy-vline,
  WA_T343J-STE06, sy-vline,
  WA_T343J-STE07, sy-vline,
  WA_T343J-STE08, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T343J 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_T343J 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_T343J INTO WA_T343J.


*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_T343J_STR, 
MANDT TYPE STRING,
LGNUM TYPE STRING,
LGTYP TYPE STRING,
STE01 TYPE STRING,
STE02 TYPE STRING,
STE03 TYPE STRING,
STE04 TYPE STRING,
STE05 TYPE STRING,
STE06 TYPE STRING,
STE07 TYPE STRING,
STE08 TYPE STRING,
STE09 TYPE STRING,
STE10 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T343J_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_T343J_STR-MANDT sy-vline 
WA_T343J_STR-LGNUM sy-vline 
WA_T343J_STR-LGTYP sy-vline 
WA_T343J_STR-STE01 sy-vline 
WA_T343J_STR-STE02 sy-vline 
WA_T343J_STR-STE03 sy-vline 
WA_T343J_STR-STE04 sy-vline 
WA_T343J_STR-STE05 sy-vline 
WA_T343J_STR-STE06 sy-vline 
WA_T343J_STR-STE07 sy-vline 
WA_T343J_STR-STE08 sy-vline 
WA_T343J_STR-STE09 sy-vline 
WA_T343J_STR-STE10 sy-vline      INTO ld_text SEPARATED BY SPACE.

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