ABAP Select data from SAP table CSMBK_CLAS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CSMBK_CLAS
*  INTO TABLE @DATA(IT_CSMBK_CLAS2).
*--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_CSMBK_CLAS INDEX 1 INTO DATA(WA_CSMBK_CLAS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CSMBK_CLAS>-SCHEME = 1.
<CSMBK_CLAS>-CLASS = 1.
<CSMBK_CLAS>-PARENT_SCH = 1.
<CSMBK_CLAS>-PARENT_CLS = 1.
<CSMBK_CLAS>-ASSOCIATN = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CSMBK_CLAS-ASSOCTYP, sy-vline,
  WA_CSMBK_CLAS-INDICATION, sy-vline,
  WA_CSMBK_CLAS-ACTIVE, sy-vline,
  WA_CSMBK_CLAS-DOMVERSION, sy-vline,
  WA_CSMBK_CLAS-SUBVERSION, sy-vline,
  WA_CSMBK_CLAS-PROVIDER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CSMBK_CLAS 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_CSMBK_CLAS 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_CSMBK_CLAS INTO WA_CSMBK_CLAS.


*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_CSMBK_CLAS_STR, 
SCHEME TYPE STRING,
CLASS TYPE STRING,
PARENT_SCH TYPE STRING,
PARENT_CLS TYPE STRING,
ASSOCIATN TYPE STRING,
ASSOCTYP TYPE STRING,
INDICATION TYPE STRING,
ACTIVE TYPE STRING,
DOMVERSION TYPE STRING,
SUBVERSION TYPE STRING,
PROVIDER TYPE STRING,
MTECLASS TYPE STRING,
REPORTER TYPE STRING,
TIMESTAMP TYPE STRING,
QUALIFIERS TYPE STRING,
SEMANTIC TYPE STRING,
ABAP_CLASS TYPE STRING,
JAVA_CLASS TYPE STRING,
NAMESPACE TYPE STRING,
SUPER_NMSP TYPE STRING,
FLAVORS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CSMBK_CLAS_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_CSMBK_CLAS_STR-SCHEME sy-vline 
WA_CSMBK_CLAS_STR-CLASS sy-vline 
WA_CSMBK_CLAS_STR-PARENT_SCH sy-vline 
WA_CSMBK_CLAS_STR-PARENT_CLS sy-vline 
WA_CSMBK_CLAS_STR-ASSOCIATN sy-vline 
WA_CSMBK_CLAS_STR-ASSOCTYP sy-vline 
WA_CSMBK_CLAS_STR-INDICATION sy-vline 
WA_CSMBK_CLAS_STR-ACTIVE sy-vline 
WA_CSMBK_CLAS_STR-DOMVERSION sy-vline 
WA_CSMBK_CLAS_STR-SUBVERSION sy-vline 
WA_CSMBK_CLAS_STR-PROVIDER sy-vline 
WA_CSMBK_CLAS_STR-MTECLASS sy-vline 
WA_CSMBK_CLAS_STR-REPORTER sy-vline 
WA_CSMBK_CLAS_STR-TIMESTAMP sy-vline 
WA_CSMBK_CLAS_STR-QUALIFIERS sy-vline 
WA_CSMBK_CLAS_STR-SEMANTIC sy-vline 
WA_CSMBK_CLAS_STR-ABAP_CLASS sy-vline 
WA_CSMBK_CLAS_STR-JAVA_CLASS sy-vline 
WA_CSMBK_CLAS_STR-NAMESPACE sy-vline 
WA_CSMBK_CLAS_STR-SUPER_NMSP sy-vline 
WA_CSMBK_CLAS_STR-FLAVORS sy-vline      INTO ld_text SEPARATED BY SPACE.

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