ABAP Select data from SAP table CRCA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRCA
*  INTO TABLE @DATA(IT_CRCA2).
*--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_CRCA INDEX 1 INTO DATA(WA_CRCA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CRCA>-MANDT = 1.
<CRCA>-OBJTY = 1.
<CRCA>-OBJID = 1.
<CRCA>-CANUM = 1.
<CRCA>-BEGDA = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRCA-ENDDA, sy-vline,
  WA_CRCA-AEDAT_KAPA, sy-vline,
  WA_CRCA-AENAM_KAPA, sy-vline,
  WA_CRCA-KAPID, sy-vline,
  WA_CRCA-FORK1, sy-vline,
  WA_CRCA-FORK2, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRCA 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_CRCA 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_CRCA INTO WA_CRCA.


*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_CRCA_STR, 
MANDT TYPE STRING,
OBJTY TYPE STRING,
OBJID TYPE STRING,
CANUM TYPE STRING,
BEGDA TYPE STRING,
ENDDA TYPE STRING,
AEDAT_KAPA TYPE STRING,
AENAM_KAPA TYPE STRING,
KAPID TYPE STRING,
FORK1 TYPE STRING,
FORK2 TYPE STRING,
FORK3 TYPE STRING,
FORKN TYPE STRING,
PROZT TYPE STRING,
VERT1 TYPE STRING,
VERT2 TYPE STRING,
VERT3 TYPE STRING,
VERTN TYPE STRING,
CAROL TYPE STRING,
ISTBED_KZ TYPE STRING,
VGWT1 TYPE STRING,
VGWT2 TYPE STRING,
VGWT3 TYPE STRING,
VGWTN TYPE STRING,
CAP_BACKFLUSH_SU TYPE STRING,
CAP_BACKFLUSH_PR TYPE STRING,
CAP_BACKFLUSH_TD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRCA_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_CRCA_STR-MANDT sy-vline 
WA_CRCA_STR-OBJTY sy-vline 
WA_CRCA_STR-OBJID sy-vline 
WA_CRCA_STR-CANUM sy-vline 
WA_CRCA_STR-BEGDA sy-vline 
WA_CRCA_STR-ENDDA sy-vline 
WA_CRCA_STR-AEDAT_KAPA sy-vline 
WA_CRCA_STR-AENAM_KAPA sy-vline 
WA_CRCA_STR-KAPID sy-vline 
WA_CRCA_STR-FORK1 sy-vline 
WA_CRCA_STR-FORK2 sy-vline 
WA_CRCA_STR-FORK3 sy-vline 
WA_CRCA_STR-FORKN sy-vline 
WA_CRCA_STR-PROZT sy-vline 
WA_CRCA_STR-VERT1 sy-vline 
WA_CRCA_STR-VERT2 sy-vline 
WA_CRCA_STR-VERT3 sy-vline 
WA_CRCA_STR-VERTN sy-vline 
WA_CRCA_STR-CAROL sy-vline 
WA_CRCA_STR-ISTBED_KZ sy-vline 
WA_CRCA_STR-VGWT1 sy-vline 
WA_CRCA_STR-VGWT2 sy-vline 
WA_CRCA_STR-VGWT3 sy-vline 
WA_CRCA_STR-VGWTN sy-vline 
WA_CRCA_STR-CAP_BACKFLUSH_SU sy-vline 
WA_CRCA_STR-CAP_BACKFLUSH_PR sy-vline 
WA_CRCA_STR-CAP_BACKFLUSH_TD sy-vline      INTO ld_text SEPARATED BY SPACE.

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