ABAP Select data from SAP table TCAT_TRANSACTION into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TCAT_TRANSACTION
*  INTO TABLE @DATA(IT_TCAT_TRANSACTION2).
*--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_TCAT_TRANSACTION INDEX 1 INTO DATA(WA_TCAT_TRANSACTION2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TCAT_TRANSACTION>-MANDT = 1.
<TCAT_TRANSACTION>-CANR_EXECUTION = 1.
<TCAT_TRANSACTION>-COMPANY_CODE = 1.
<TCAT_TRANSACTION>-CORPACT_CATEGORY = 1.
<TCAT_TRANSACTION>-CORPACT_TYPE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TCAT_TRANSACTION-CANR_DEFINITION, sy-vline,
  WA_TCAT_TRANSACTION-EXECUTION_DATE, sy-vline,
  WA_TCAT_TRANSACTION-BUSTRANSID, sy-vline,
  WA_TCAT_TRANSACTION-CREATE_DATE, sy-vline,
  WA_TCAT_TRANSACTION-CREATE_TIME, sy-vline,
  WA_TCAT_TRANSACTION-STATUS, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TCAT_TRANSACTION 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_TCAT_TRANSACTION 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_TCAT_TRANSACTION INTO WA_TCAT_TRANSACTION.


*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 CANR_EXECUTION
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCAT_TRANSACTION-CANR_EXECUTION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCAT_TRANSACTION-CANR_EXECUTION.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field RFHA
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_TCAT_TRANSACTION-RFHA
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TCAT_TRANSACTION-RFHA.
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_TCAT_TRANSACTION_STR, 
MANDT TYPE STRING,
CANR_EXECUTION TYPE STRING,
COMPANY_CODE TYPE STRING,
CORPACT_CATEGORY TYPE STRING,
CORPACT_TYPE TYPE STRING,
CANR_DEFINITION TYPE STRING,
EXECUTION_DATE TYPE STRING,
BUSTRANSID TYPE STRING,
CREATE_DATE TYPE STRING,
CREATE_TIME TYPE STRING,
STATUS TYPE STRING,
FI_POSTING_DATE TYPE STRING,
FI_REVERSAL_DATE TYPE STRING,
FI_POST_PERIOD TYPE STRING,
FI_REV_PERIOD TYPE STRING,
DOCUMENT_DATE TYPE STRING,
REVERSAL_REASON TYPE STRING,
BOOKING_TEXT TYPE STRING,
MIGRATION_FLG TYPE STRING,
RERF TYPE STRING,
DERF TYPE STRING,
TERF TYPE STRING,
REHER TYPE STRING,
RBEAR TYPE STRING,
DBEAR TYPE STRING,
TBEAR TYPE STRING,
RBHER TYPE STRING,
RFHA TYPE STRING,
RFHAZU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TCAT_TRANSACTION_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_TCAT_TRANSACTION_STR-MANDT sy-vline 
WA_TCAT_TRANSACTION_STR-CANR_EXECUTION sy-vline 
WA_TCAT_TRANSACTION_STR-COMPANY_CODE sy-vline 
WA_TCAT_TRANSACTION_STR-CORPACT_CATEGORY sy-vline 
WA_TCAT_TRANSACTION_STR-CORPACT_TYPE sy-vline 
WA_TCAT_TRANSACTION_STR-CANR_DEFINITION sy-vline 
WA_TCAT_TRANSACTION_STR-EXECUTION_DATE sy-vline 
WA_TCAT_TRANSACTION_STR-BUSTRANSID sy-vline 
WA_TCAT_TRANSACTION_STR-CREATE_DATE sy-vline 
WA_TCAT_TRANSACTION_STR-CREATE_TIME sy-vline 
WA_TCAT_TRANSACTION_STR-STATUS sy-vline 
WA_TCAT_TRANSACTION_STR-FI_POSTING_DATE sy-vline 
WA_TCAT_TRANSACTION_STR-FI_REVERSAL_DATE sy-vline 
WA_TCAT_TRANSACTION_STR-FI_POST_PERIOD sy-vline 
WA_TCAT_TRANSACTION_STR-FI_REV_PERIOD sy-vline 
WA_TCAT_TRANSACTION_STR-DOCUMENT_DATE sy-vline 
WA_TCAT_TRANSACTION_STR-REVERSAL_REASON sy-vline 
WA_TCAT_TRANSACTION_STR-BOOKING_TEXT sy-vline 
WA_TCAT_TRANSACTION_STR-MIGRATION_FLG sy-vline 
WA_TCAT_TRANSACTION_STR-RERF sy-vline 
WA_TCAT_TRANSACTION_STR-DERF sy-vline 
WA_TCAT_TRANSACTION_STR-TERF sy-vline 
WA_TCAT_TRANSACTION_STR-REHER sy-vline 
WA_TCAT_TRANSACTION_STR-RBEAR sy-vline 
WA_TCAT_TRANSACTION_STR-DBEAR sy-vline 
WA_TCAT_TRANSACTION_STR-TBEAR sy-vline 
WA_TCAT_TRANSACTION_STR-RBHER sy-vline 
WA_TCAT_TRANSACTION_STR-RFHA sy-vline 
WA_TCAT_TRANSACTION_STR-RFHAZU sy-vline      INTO ld_text SEPARATED BY SPACE.

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