ABAP Select data from SAP table CSM_CLASS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSM_CLASS
*  INTO TABLE @DATA(IT_CSM_CLASS2).
*--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_CSM_CLASS INDEX 1 INTO DATA(WA_CSM_CLASS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSM_CLASS>-SCHEME = 1.
<CSM_CLASS>-CLASS = 1.
<CSM_CLASS>-NAMESPACE = 1.
<CSM_CLASS>-SUPER_SCH = 1.
<CSM_CLASS>-SUPER_CLS = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSM_CLASS-UI_NAME, sy-vline,
  WA_CSM_CLASS-CLASSTYPE, sy-vline,
  WA_CSM_CLASS-SCOPED_BY, sy-vline,
  WA_CSM_CLASS-ARITY, sy-vline,
  WA_CSM_CLASS-SCOPING_A, sy-vline,
  WA_CSM_CLASS-ABSTRACT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSM_CLASS 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_CSM_CLASS 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_CSM_CLASS INTO WA_CSM_CLASS.


*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_CSM_CLASS_STR, 
SCHEME TYPE STRING,
CLASS TYPE STRING,
NAMESPACE TYPE STRING,
SUPER_SCH TYPE STRING,
SUPER_CLS TYPE STRING,
UI_NAME TYPE STRING,
CLASSTYPE TYPE STRING,
SCOPED_BY TYPE STRING,
ARITY TYPE STRING,
SCOPING_A TYPE STRING,
ABSTRACT TYPE STRING,
FINAL TYPE STRING,
EXTENDNAM TYPE STRING,
DYNAMIC TYPE STRING,
SAPKEYS TYPE STRING,
ACTIVE TYPE STRING,
TR_CREATE TYPE STRING,
TR_UPDATE TYPE STRING,
TR_ACCESS TYPE STRING,
TR_DELETE TYPE STRING,
TR_THROWN TYPE STRING,
DELETEQ TYPE STRING,
IFDELQ TYPE STRING,
DOMVERS TYPE STRING,
SUBVERS TYPE STRING,
SEMANTIC TYPE STRING,
PROVIDER TYPE STRING,
COMPONENT TYPE STRING,
ABAP_CLASS TYPE STRING,
JAVA_CLASS TYPE STRING,
MTECLASS TYPE STRING,
REPORTER TYPE STRING,
TIMESTAMP TYPE STRING,
CLASSGUID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSM_CLASS_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_CSM_CLASS_STR-SCHEME sy-vline 
WA_CSM_CLASS_STR-CLASS sy-vline 
WA_CSM_CLASS_STR-NAMESPACE sy-vline 
WA_CSM_CLASS_STR-SUPER_SCH sy-vline 
WA_CSM_CLASS_STR-SUPER_CLS sy-vline 
WA_CSM_CLASS_STR-UI_NAME sy-vline 
WA_CSM_CLASS_STR-CLASSTYPE sy-vline 
WA_CSM_CLASS_STR-SCOPED_BY sy-vline 
WA_CSM_CLASS_STR-ARITY sy-vline 
WA_CSM_CLASS_STR-SCOPING_A sy-vline 
WA_CSM_CLASS_STR-ABSTRACT sy-vline 
WA_CSM_CLASS_STR-FINAL sy-vline 
WA_CSM_CLASS_STR-EXTENDNAM sy-vline 
WA_CSM_CLASS_STR-DYNAMIC sy-vline 
WA_CSM_CLASS_STR-SAPKEYS sy-vline 
WA_CSM_CLASS_STR-ACTIVE sy-vline 
WA_CSM_CLASS_STR-TR_CREATE sy-vline 
WA_CSM_CLASS_STR-TR_UPDATE sy-vline 
WA_CSM_CLASS_STR-TR_ACCESS sy-vline 
WA_CSM_CLASS_STR-TR_DELETE sy-vline 
WA_CSM_CLASS_STR-TR_THROWN sy-vline 
WA_CSM_CLASS_STR-DELETEQ sy-vline 
WA_CSM_CLASS_STR-IFDELQ sy-vline 
WA_CSM_CLASS_STR-DOMVERS sy-vline 
WA_CSM_CLASS_STR-SUBVERS sy-vline 
WA_CSM_CLASS_STR-SEMANTIC sy-vline 
WA_CSM_CLASS_STR-PROVIDER sy-vline 
WA_CSM_CLASS_STR-COMPONENT sy-vline 
WA_CSM_CLASS_STR-ABAP_CLASS sy-vline 
WA_CSM_CLASS_STR-JAVA_CLASS sy-vline 
WA_CSM_CLASS_STR-MTECLASS sy-vline 
WA_CSM_CLASS_STR-REPORTER sy-vline 
WA_CSM_CLASS_STR-TIMESTAMP sy-vline 
WA_CSM_CLASS_STR-CLASSGUID sy-vline      INTO ld_text SEPARATED BY SPACE.

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