ABAP Select data from SAP table TRSS_POS_CHG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TRSS_POS_CHG
*  INTO TABLE @DATA(IT_TRSS_POS_CHG2).
*--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_TRSS_POS_CHG INDEX 1 INTO DATA(WA_TRSS_POS_CHG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TRSS_POS_CHG>-OS_GUID = 1.
<TRSS_POS_CHG>-COMPANY_CODE = 1.
<TRSS_POS_CHG>-POS_CHG_ID = 1.
<TRSS_POS_CHG>-COM_VAL_CLASS = 1.
<TRSS_POS_CHG>-POSITION_DATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TRSS_POS_CHG-TRD_TRANSACTION, sy-vline,
  WA_TRSS_POS_CHG-STORNO_FLAG, sy-vline,
  WA_TRSS_POS_CHG-DOCUMENT_DATE, sy-vline,
  WA_TRSS_POS_CHG-POSITION_OID, sy-vline,
  WA_TRSS_POS_CHG-POSITION_CLS, sy-vline,
  WA_TRSS_POS_CHG-USER_DATA_CLS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TRSS_POS_CHG 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_TRSS_POS_CHG 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_TRSS_POS_CHG INTO WA_TRSS_POS_CHG.


*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_TRSS_POS_CHG_STR, 
OS_GUID TYPE STRING,
COMPANY_CODE TYPE STRING,
POS_CHG_ID TYPE STRING,
COM_VAL_CLASS TYPE STRING,
POSITION_DATE TYPE STRING,
TRD_TRANSACTION TYPE STRING,
STORNO_FLAG TYPE STRING,
DOCUMENT_DATE TYPE STRING,
POSITION_OID TYPE STRING,
POSITION_CLS TYPE STRING,
USER_DATA_CLS TYPE STRING,
USER_DATA_OID TYPE STRING,
USER_DATA_S_CLS TYPE STRING,
USER_DATA_S_OID TYPE STRING,
TAB_FLOWS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TRSS_POS_CHG_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_TRSS_POS_CHG_STR-OS_GUID sy-vline 
WA_TRSS_POS_CHG_STR-COMPANY_CODE sy-vline 
WA_TRSS_POS_CHG_STR-POS_CHG_ID sy-vline 
WA_TRSS_POS_CHG_STR-COM_VAL_CLASS sy-vline 
WA_TRSS_POS_CHG_STR-POSITION_DATE sy-vline 
WA_TRSS_POS_CHG_STR-TRD_TRANSACTION sy-vline 
WA_TRSS_POS_CHG_STR-STORNO_FLAG sy-vline 
WA_TRSS_POS_CHG_STR-DOCUMENT_DATE sy-vline 
WA_TRSS_POS_CHG_STR-POSITION_OID sy-vline 
WA_TRSS_POS_CHG_STR-POSITION_CLS sy-vline 
WA_TRSS_POS_CHG_STR-USER_DATA_CLS sy-vline 
WA_TRSS_POS_CHG_STR-USER_DATA_OID sy-vline 
WA_TRSS_POS_CHG_STR-USER_DATA_S_CLS sy-vline 
WA_TRSS_POS_CHG_STR-USER_DATA_S_OID sy-vline 
WA_TRSS_POS_CHG_STR-TAB_FLOWS sy-vline      INTO ld_text SEPARATED BY SPACE.

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