ABAP Select data from SAP table /CLMDV/DB_ATTRIBUTES into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /CLMDV/DB_ATTRIBUTES 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 /CLMDV/DB_ATTRIBUTES. 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 /CLMDV/DB_ATTRIBUTES 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_/CLMDV/DB_ATTRIBUTES TYPE STANDARD TABLE OF /CLMDV/DB_ATTRIBUTES,
      WA_/CLMDV/DB_ATTRIBUTES TYPE /CLMDV/DB_ATTRIBUTES,
      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: </CLMDV/DB_ATTRIBUTES> TYPE /CLMDV/DB_ATTRIBUTES.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /CLMDV/DB_ATTRIBUTES
  INTO TABLE IT_/CLMDV/DB_ATTRIBUTES.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /CLMDV/DB_ATTRIBUTES
*  INTO TABLE @DATA(IT_/CLMDV/DB_ATTRIBUTES2).
*--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_/CLMDV/DB_ATTRIBUTES INDEX 1 INTO DATA(WA_/CLMDV/DB_ATTRIBUTES2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/CLMDV/DB_ATTRIBUTES ASSIGNING </CLMDV/DB_ATTRIBUTES>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</CLMDV/DB_ATTRIBUTES>-TAB_NAME = 1.
</CLMDV/DB_ATTRIBUTES>-TAB_SIZE = 1.
</CLMDV/DB_ATTRIBUTES>-TAB_FIELDS = 1.
</CLMDV/DB_ATTRIBUTES>-TAB_P_KEYS = 1.
</CLMDV/DB_ATTRIBUTES>-FIELDNAME = 1.

ENDLOOP.

LOOP AT IT_/CLMDV/DB_ATTRIBUTES INTO WA_/CLMDV/DB_ATTRIBUTES.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/CLMDV/DB_ATTRIBUTES-FORTABLE, sy-vline,
  WA_/CLMDV/DB_ATTRIBUTES-FORKEY, sy-vline,
  WA_/CLMDV/DB_ATTRIBUTES-CHECKTABLE, sy-vline,
  WA_/CLMDV/DB_ATTRIBUTES-CHECKFIELD, sy-vline,
  WA_/CLMDV/DB_ATTRIBUTES-NUMBER_OF_RECORDS, sy-vline,
  WA_/CLMDV/DB_ATTRIBUTES-RECORDSIZE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/CLMDV/DB_ATTRIBUTES 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_/CLMDV/DB_ATTRIBUTES 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_/CLMDV/DB_ATTRIBUTES INTO WA_/CLMDV/DB_ATTRIBUTES.


*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.

*Conversion exit DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/CLMDV/DB_ATTRIBUTES-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/CLMDV/DB_ATTRIBUTES-DATATYPE.
WRITE:/ 'New Value:', ld_input.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_/CLMDV/DB_ATTRIBUTES_STR, 
TAB_NAME TYPE STRING,
TAB_SIZE TYPE STRING,
TAB_FIELDS TYPE STRING,
TAB_P_KEYS TYPE STRING,
FIELDNAME TYPE STRING,
FORTABLE TYPE STRING,
FORKEY TYPE STRING,
CHECKTABLE TYPE STRING,
CHECKFIELD TYPE STRING,
NUMBER_OF_RECORDS TYPE STRING,
RECORDSIZE TYPE STRING,
SYSTEMID TYPE STRING,
DATATYPE TYPE STRING,
INDEXNAME TYPE STRING,
INDEXFIELDNAME TYPE STRING,
NUMBER_OF_COLUMNS TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/CLMDV/DB_ATTRIBUTES_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_/CLMDV/DB_ATTRIBUTES_STR-TAB_NAME sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-TAB_SIZE sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-TAB_FIELDS sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-TAB_P_KEYS sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-FIELDNAME sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-FORTABLE sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-FORKEY sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-CHECKTABLE sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-CHECKFIELD sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-NUMBER_OF_RECORDS sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-RECORDSIZE sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-SYSTEMID sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-DATATYPE sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-INDEXNAME sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-INDEXFIELDNAME sy-vline 
WA_/CLMDV/DB_ATTRIBUTES_STR-NUMBER_OF_COLUMNS sy-vline      INTO ld_text SEPARATED BY SPACE.

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