ABAP Select data from SAP table T156X into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP T156X 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 T156X. 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 T156X 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_T156X TYPE STANDARD TABLE OF T156X,
      WA_T156X TYPE T156X,
      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: <T156X> TYPE T156X.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_T156X.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM T156X
  INTO TABLE IT_T156X.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM T156X
*  INTO TABLE @DATA(IT_T156X2).
*--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_T156X INDEX 1 INTO DATA(WA_T156X2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_T156X ASSIGNING <T156X>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<T156X>-MANDT = 1.
<T156X>-BWART = 1.
<T156X>-WERTU = 1.
<T156X>-MENGU = 1.
<T156X>-SOBKZ = 1.

ENDLOOP.

LOOP AT IT_T156X INTO WA_T156X.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_T156X-KZBEW, sy-vline,
  WA_T156X-KZVBR, sy-vline,
  WA_T156X-BUSTW, sy-vline,
  WA_T156X-OIHACCDTN, sy-vline,
  WA_T156X-CNT02, sy-vline,
  WA_T156X-KOMOK, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_T156X 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_T156X 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_T156X INTO WA_T156X.


*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_T156X_STR, 
MANDT TYPE STRING,
BWART TYPE STRING,
WERTU TYPE STRING,
MENGU TYPE STRING,
SOBKZ TYPE STRING,
KZBEW TYPE STRING,
KZVBR TYPE STRING,
BUSTW TYPE STRING,
OIHACCDTN TYPE STRING,
CNT02 TYPE STRING,
KOMOK TYPE STRING,
XPKON TYPE STRING,END OF T_EKKO_STR.
DATA: WA_T156X_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_T156X_STR-MANDT sy-vline 
WA_T156X_STR-BWART sy-vline 
WA_T156X_STR-WERTU sy-vline 
WA_T156X_STR-MENGU sy-vline 
WA_T156X_STR-SOBKZ sy-vline 
WA_T156X_STR-KZBEW sy-vline 
WA_T156X_STR-KZVBR sy-vline 
WA_T156X_STR-BUSTW sy-vline 
WA_T156X_STR-OIHACCDTN sy-vline 
WA_T156X_STR-CNT02 sy-vline 
WA_T156X_STR-KOMOK sy-vline 
WA_T156X_STR-XPKON sy-vline      INTO ld_text SEPARATED BY SPACE.

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