ABAP Select data from SAP table CRM_CATT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CRM_CATT
*  INTO TABLE @DATA(IT_CRM_CATT2).
*--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_CRM_CATT INDEX 1 INTO DATA(WA_CRM_CATT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CRM_CATT>-OBJSETKIND = 1.
<CRM_CATT>-OBJSETID = 1.
<CRM_CATT>-RFCDST = 1.
<CRM_CATT>-CATLVORN = 1.
<CRM_CATT>-CATLABLN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CRM_CATT-SCR_LNR, sy-vline,
  WA_CRM_CATT-UNAME, sy-vline,
  WA_CRM_CATT-TADIRTYP, sy-vline,
  WA_CRM_CATT-CRETSTAMP, sy-vline,
  WA_CRM_CATT-CATTNAME, sy-vline,
  WA_CRM_CATT-VARNT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CRM_CATT 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_CRM_CATT 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_CRM_CATT INTO WA_CRM_CATT.


*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_CRM_CATT_STR, 
OBJSETKIND TYPE STRING,
OBJSETID TYPE STRING,
RFCDST TYPE STRING,
CATLVORN TYPE STRING,
CATLABLN TYPE STRING,
SCR_LNR TYPE STRING,
UNAME TYPE STRING,
TADIRTYP TYPE STRING,
CRETSTAMP TYPE STRING,
CATTNAME TYPE STRING,
VARNT TYPE STRING,
RFCHOST TYPE STRING,
RFCSYS TYPE STRING,
RFCCLIENT TYPE STRING,
RFCSERVICE TYPE STRING,
SESSION_ID TYPE STRING,
ECATLVORN TYPE STRING,
ECATT_RFCDST TYPE STRING,
ECATT_RFCSYS TYPE STRING,
ECATT_RFCHOST TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CRM_CATT_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_CRM_CATT_STR-OBJSETKIND sy-vline 
WA_CRM_CATT_STR-OBJSETID sy-vline 
WA_CRM_CATT_STR-RFCDST sy-vline 
WA_CRM_CATT_STR-CATLVORN sy-vline 
WA_CRM_CATT_STR-CATLABLN sy-vline 
WA_CRM_CATT_STR-SCR_LNR sy-vline 
WA_CRM_CATT_STR-UNAME sy-vline 
WA_CRM_CATT_STR-TADIRTYP sy-vline 
WA_CRM_CATT_STR-CRETSTAMP sy-vline 
WA_CRM_CATT_STR-CATTNAME sy-vline 
WA_CRM_CATT_STR-VARNT sy-vline 
WA_CRM_CATT_STR-RFCHOST sy-vline 
WA_CRM_CATT_STR-RFCSYS sy-vline 
WA_CRM_CATT_STR-RFCCLIENT sy-vline 
WA_CRM_CATT_STR-RFCSERVICE sy-vline 
WA_CRM_CATT_STR-SESSION_ID sy-vline 
WA_CRM_CATT_STR-ECATLVORN sy-vline 
WA_CRM_CATT_STR-ECATT_RFCDST sy-vline 
WA_CRM_CATT_STR-ECATT_RFCSYS sy-vline 
WA_CRM_CATT_STR-ECATT_RFCHOST sy-vline      INTO ld_text SEPARATED BY SPACE.

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