ABAP Select data from SAP table CLCMEXPORTCAT into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CLCMEXPORTCAT
*  INTO TABLE @DATA(IT_CLCMEXPORTCAT2).
*--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_CLCMEXPORTCAT INDEX 1 INTO DATA(WA_CLCMEXPORTCAT2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CLCMEXPORTCAT>-MANDT = 1.
<CLCMEXPORTCAT>-LEGALCATEGORY = 1.
<CLCMEXPORTCAT>-LGLCNTNTMCATLEVEL = 1.
<CLCMEXPORTCAT>-LGLCNTNTMCATTYPE = 1.
<CLCMEXPORTCAT>-LGLCNTNTMCATISSELECT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CLCMEXPORTCAT-LGLCNTNTMCATISMULTISELECTION, sy-vline,
  WA_CLCMEXPORTCAT-LGLCNTNTMCATISOBSOLETE, sy-vline,
  WA_CLCMEXPORTCAT-LGLCNTNTMPARENTCATEGORY, sy-vline,
  WA_CLCMEXPORTCAT-LGLCNTNTMROOTCATEGORY, sy-vline,
  WA_CLCMEXPORTCAT-LGLCNTNTMCATMODEL, sy-vline,
  WA_CLCMEXPORTCAT-LGLCNTNTMCATEGORYVALUE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CLCMEXPORTCAT 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_CLCMEXPORTCAT 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_CLCMEXPORTCAT INTO WA_CLCMEXPORTCAT.


*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_CLCMEXPORTCAT_STR, 
MANDT TYPE STRING,
LEGALCATEGORY TYPE STRING,
LGLCNTNTMCATLEVEL TYPE STRING,
LGLCNTNTMCATTYPE TYPE STRING,
LGLCNTNTMCATISSELECT TYPE STRING,
LGLCNTNTMCATISMULTISELECTION TYPE STRING,
LGLCNTNTMCATISOBSOLETE TYPE STRING,
LGLCNTNTMPARENTCATEGORY TYPE STRING,
LGLCNTNTMROOTCATEGORY TYPE STRING,
LGLCNTNTMCATMODEL TYPE STRING,
LGLCNTNTMCATEGORYVALUE TYPE STRING,
LGLCNTNTMCATISUPDATEFROMTABLE TYPE STRING,
LGLCNTNTMCREATEDUTCDATETIME TYPE STRING,
LGLCNTNTMCREATEDBYUSER TYPE STRING,
LGLCNTNTMCHANGEDUTCDATETIME TYPE STRING,
LGLCNTNTMCHANGEDBYUSER TYPE STRING,
LGLCNTNTMCATEGORYNAME TYPE STRING,
LGLCNTNTMCATPURPOSE TYPE STRING,
LGLCNTNTMUPDATEACTIVITY TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CLCMEXPORTCAT_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_CLCMEXPORTCAT_STR-MANDT sy-vline 
WA_CLCMEXPORTCAT_STR-LEGALCATEGORY sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATLEVEL sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATTYPE sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATISSELECT sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATISMULTISELECTION sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATISOBSOLETE sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMPARENTCATEGORY sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMROOTCATEGORY sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATMODEL sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATEGORYVALUE sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATISUPDATEFROMTABLE sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCREATEDUTCDATETIME sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCREATEDBYUSER sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCHANGEDUTCDATETIME sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCHANGEDBYUSER sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATEGORYNAME sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMCATPURPOSE sy-vline 
WA_CLCMEXPORTCAT_STR-LGLCNTNTMUPDATEACTIVITY sy-vline      INTO ld_text SEPARATED BY SPACE.

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