ABAP Select data from SAP table TCRIN into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TCRIN
*  INTO TABLE @DATA(IT_TCRIN2).
*--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_TCRIN INDEX 1 INTO DATA(WA_TCRIN2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TCRIN>-MANDT = 1.
<TCRIN>-CCINS = 1.
<TCRIN>-CRVOUNUMKR = 1.
<TCRIN>-CRREADFILE = 1.
<TCRIN>-CRCHECFILE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TCRIN-CRCONVFILE, sy-vline,
  WA_TCRIN-CRDUPLFILE, sy-vline,
  WA_TCRIN-CRFMVENDOR, sy-vline,
  WA_TCRIN-CRFMVOUCH, sy-vline,
  WA_TCRIN-CRCHDOC, sy-vline,
  WA_TCRIN-CRINCLTAX, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TCRIN 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_TCRIN 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_TCRIN INTO WA_TCRIN.


*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_TCRIN_STR, 
MANDT TYPE STRING,
CCINS TYPE STRING,
CRVOUNUMKR TYPE STRING,
CRREADFILE TYPE STRING,
CRCHECFILE TYPE STRING,
CRCONVFILE TYPE STRING,
CRDUPLFILE TYPE STRING,
CRFMVENDOR TYPE STRING,
CRFMVOUCH TYPE STRING,
CRCHDOC TYPE STRING,
CRINCLTAX TYPE STRING,
CRCARDRS TYPE STRING,
CRFILERS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TCRIN_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_TCRIN_STR-MANDT sy-vline 
WA_TCRIN_STR-CCINS sy-vline 
WA_TCRIN_STR-CRVOUNUMKR sy-vline 
WA_TCRIN_STR-CRREADFILE sy-vline 
WA_TCRIN_STR-CRCHECFILE sy-vline 
WA_TCRIN_STR-CRCONVFILE sy-vline 
WA_TCRIN_STR-CRDUPLFILE sy-vline 
WA_TCRIN_STR-CRFMVENDOR sy-vline 
WA_TCRIN_STR-CRFMVOUCH sy-vline 
WA_TCRIN_STR-CRCHDOC sy-vline 
WA_TCRIN_STR-CRINCLTAX sy-vline 
WA_TCRIN_STR-CRCARDRS sy-vline 
WA_TCRIN_STR-CRFILERS sy-vline      INTO ld_text SEPARATED BY SPACE.

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