ABAP Select data from SAP table TREAV_ASSIGNMENT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TREAV_ASSIGNMENT
*  INTO TABLE @DATA(IT_TREAV_ASSIGNMENT2).
*--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_TREAV_ASSIGNMENT INDEX 1 INTO DATA(WA_TREAV_ASSIGNMENT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TREAV_ASSIGNMENT>-MANDT = 1.
<TREAV_ASSIGNMENT>-OID = 1.
<TREAV_ASSIGNMENT>-ASS_TYPE = 1.
<TREAV_ASSIGNMENT>-SOURCE_CONTEXT = 1.
<TREAV_ASSIGNMENT>-SOURCE_OID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TREAV_ASSIGNMENT-TARGET_CONTEXT, sy-vline,
  WA_TREAV_ASSIGNMENT-TARGET_OID, sy-vline,
  WA_TREAV_ASSIGNMENT-STATUS, sy-vline,
  WA_TREAV_ASSIGNMENT-VALID_FROM, sy-vline,
  WA_TREAV_ASSIGNMENT-VALID_TO, sy-vline,
  WA_TREAV_ASSIGNMENT-COMPANY_CODE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TREAV_ASSIGNMENT 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_TREAV_ASSIGNMENT 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_TREAV_ASSIGNMENT INTO WA_TREAV_ASSIGNMENT.


*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.

*Conversion exit ALPHA, internal->external for field DEAL_NUMBER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TREAV_ASSIGNMENT-DEAL_NUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TREAV_ASSIGNMENT-DEAL_NUMBER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CSP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TREAV_ASSIGNMENT-CSP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TREAV_ASSIGNMENT-CSP.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field KONTRH
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TREAV_ASSIGNMENT-KONTRH
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TREAV_ASSIGNMENT-KONTRH.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_TREAV_ASSIGNMENT_STR, 
MANDT TYPE STRING,
OID TYPE STRING,
ASS_TYPE TYPE STRING,
SOURCE_CONTEXT TYPE STRING,
SOURCE_OID TYPE STRING,
TARGET_CONTEXT TYPE STRING,
TARGET_OID TYPE STRING,
STATUS TYPE STRING,
VALID_FROM TYPE STRING,
VALID_TO TYPE STRING,
COMPANY_CODE TYPE STRING,
DEAL_NUMBER TYPE STRING,
PRODUCT_TYPE TYPE STRING,
EXT_ACCOUNT TYPE STRING,
EXT_ACCOUNT_TYPE TYPE STRING,
EXT_ACCOUNT_TEXT TYPE STRING,
EXT_ACCOUNT_ID TYPE STRING,
POSITION_CUR TYPE STRING,
CONTEXT TYPE STRING,
MANDT_DIFF TYPE STRING,
OID_DIFF TYPE STRING,
MANDT_EXT_ACC TYPE STRING,
OS_GUID_EXT_ACC TYPE STRING,
MANDT_POS TYPE STRING,
POSITION_OID_POS TYPE STRING,
MANDT_CLEAR_ACC TYPE STRING,
OS_GUID_CLEAR_AC TYPE STRING,
CSP TYPE STRING,
MANDT_VTBFHA TYPE STRING,
BUKRS TYPE STRING,
SANLF TYPE STRING,
SFGTYP TYPE STRING,
SGSART TYPE STRING,
SFHAART TYPE STRING,
KONTRH TYPE STRING,
SAKTIV TYPE STRING,
CLEARING_OPTION TYPE STRING,
CLEARING_STATUS TYPE STRING,
CLEARING_DATE TYPE STRING,
CLEAR_DATE_ACT TYPE STRING,
RFHAZUL TYPE STRING,
WGSCHFT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TREAV_ASSIGNMENT_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_TREAV_ASSIGNMENT_STR-MANDT sy-vline 
WA_TREAV_ASSIGNMENT_STR-OID sy-vline 
WA_TREAV_ASSIGNMENT_STR-ASS_TYPE sy-vline 
WA_TREAV_ASSIGNMENT_STR-SOURCE_CONTEXT sy-vline 
WA_TREAV_ASSIGNMENT_STR-SOURCE_OID sy-vline 
WA_TREAV_ASSIGNMENT_STR-TARGET_CONTEXT sy-vline 
WA_TREAV_ASSIGNMENT_STR-TARGET_OID sy-vline 
WA_TREAV_ASSIGNMENT_STR-STATUS sy-vline 
WA_TREAV_ASSIGNMENT_STR-VALID_FROM sy-vline 
WA_TREAV_ASSIGNMENT_STR-VALID_TO sy-vline 
WA_TREAV_ASSIGNMENT_STR-COMPANY_CODE sy-vline 
WA_TREAV_ASSIGNMENT_STR-DEAL_NUMBER sy-vline 
WA_TREAV_ASSIGNMENT_STR-PRODUCT_TYPE sy-vline 
WA_TREAV_ASSIGNMENT_STR-EXT_ACCOUNT sy-vline 
WA_TREAV_ASSIGNMENT_STR-EXT_ACCOUNT_TYPE sy-vline 
WA_TREAV_ASSIGNMENT_STR-EXT_ACCOUNT_TEXT sy-vline 
WA_TREAV_ASSIGNMENT_STR-EXT_ACCOUNT_ID sy-vline 
WA_TREAV_ASSIGNMENT_STR-POSITION_CUR sy-vline 
WA_TREAV_ASSIGNMENT_STR-CONTEXT sy-vline 
WA_TREAV_ASSIGNMENT_STR-MANDT_DIFF sy-vline 
WA_TREAV_ASSIGNMENT_STR-OID_DIFF sy-vline 
WA_TREAV_ASSIGNMENT_STR-MANDT_EXT_ACC sy-vline 
WA_TREAV_ASSIGNMENT_STR-OS_GUID_EXT_ACC sy-vline 
WA_TREAV_ASSIGNMENT_STR-MANDT_POS sy-vline 
WA_TREAV_ASSIGNMENT_STR-POSITION_OID_POS sy-vline 
WA_TREAV_ASSIGNMENT_STR-MANDT_CLEAR_ACC sy-vline 
WA_TREAV_ASSIGNMENT_STR-OS_GUID_CLEAR_AC sy-vline 
WA_TREAV_ASSIGNMENT_STR-CSP sy-vline 
WA_TREAV_ASSIGNMENT_STR-MANDT_VTBFHA sy-vline 
WA_TREAV_ASSIGNMENT_STR-BUKRS sy-vline 
WA_TREAV_ASSIGNMENT_STR-SANLF sy-vline 
WA_TREAV_ASSIGNMENT_STR-SFGTYP sy-vline 
WA_TREAV_ASSIGNMENT_STR-SGSART sy-vline 
WA_TREAV_ASSIGNMENT_STR-SFHAART sy-vline 
WA_TREAV_ASSIGNMENT_STR-KONTRH sy-vline 
WA_TREAV_ASSIGNMENT_STR-SAKTIV sy-vline 
WA_TREAV_ASSIGNMENT_STR-CLEARING_OPTION sy-vline 
WA_TREAV_ASSIGNMENT_STR-CLEARING_STATUS sy-vline 
WA_TREAV_ASSIGNMENT_STR-CLEARING_DATE sy-vline 
WA_TREAV_ASSIGNMENT_STR-CLEAR_DATE_ACT sy-vline 
WA_TREAV_ASSIGNMENT_STR-RFHAZUL sy-vline 
WA_TREAV_ASSIGNMENT_STR-WGSCHFT sy-vline      INTO ld_text SEPARATED BY SPACE.

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