ABAP Select data from SAP table CATCHNGLOG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CATCHNGLOG
*  INTO TABLE @DATA(IT_CATCHNGLOG2).
*--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_CATCHNGLOG INDEX 1 INTO DATA(WA_CATCHNGLOG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CATCHNGLOG>-MANDT = 1.
<CATCHNGLOG>-CONTROLLINGAREA = 1.
<CATCHNGLOG>-COSTCTRACTIVITYTYPE = 1.
<CATCHNGLOG>-CHANGEDOCUMENTVALIDITYENDDATE = 1.
<CATCHNGLOG>-CHANGEDOCVALIDITYSTARTDATE = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CATCHNGLOG-CHANGEDOCOBJECT, sy-vline,
  WA_CATCHNGLOG-CHANGEDOCUMENT, sy-vline,
  WA_CATCHNGLOG-ACTIVITYTYPEFIELDNAME, sy-vline,
  WA_CATCHNGLOG-CHANGEDOCITEMCHANGETYPE, sy-vline,
  WA_CATCHNGLOG-CHANGEDOCOBJECTCLASS, sy-vline,
  WA_CATCHNGLOG-CHANGEDOCTABLETECHNICALNAME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CATCHNGLOG 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_CATCHNGLOG 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_CATCHNGLOG INTO WA_CATCHNGLOG.


*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 ALPHA, internal->external for field CHANGEDOCUMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATCHNGLOG-CHANGEDOCUMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATCHNGLOG-CHANGEDOCUMENT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field CHANGEDOCOBJECTCLASS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATCHNGLOG-CHANGEDOCOBJECTCLASS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATCHNGLOG-CHANGEDOCOBJECTCLASS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ISOLA, internal->external for field CHANGEDOCLANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_CATCHNGLOG-CHANGEDOCLANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATCHNGLOG-CHANGEDOCLANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field ALLOCATIONCOSTELEMENT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CATCHNGLOG-ALLOCATIONCOSTELEMENT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CATCHNGLOG-ALLOCATIONCOSTELEMENT.
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_CATCHNGLOG_STR, 
MANDT TYPE STRING,
CONTROLLINGAREA TYPE STRING,
COSTCTRACTIVITYTYPE TYPE STRING,
CHANGEDOCUMENTVALIDITYENDDATE TYPE STRING,
CHANGEDOCVALIDITYSTARTDATE TYPE STRING,
CHANGEDOCOBJECT TYPE STRING,
CHANGEDOCUMENT TYPE STRING,
ACTIVITYTYPEFIELDNAME TYPE STRING,
CHANGEDOCITEMCHANGETYPE TYPE STRING,
CHANGEDOCOBJECTCLASS TYPE STRING,
CHANGEDOCTABLETECHNICALNAME TYPE STRING,
CHANGEDOCTABLEKEY TYPE STRING,
CHANGEDOCNEWFIELDVALUE TYPE STRING,
CHANGEDOCPREVIOUSFIELDVALUE TYPE STRING,
ACTIVITYTYPEVALIDONDATE TYPE STRING,
CREATEDBYUSER TYPE STRING,
CHANGEDOCCREATIONDATE TYPE STRING,
CHANGEDOCCHANGETIME TYPE STRING,
CHANGEDOCLANGUAGE TYPE STRING,
COSTCTRACTYTYPESEARCHELEMENT TYPE STRING,
ALLOCATIONCOSTELEMENT TYPE STRING,
COSTELEMENTNAME TYPE STRING,
CONTROLLINGAREANAME TYPE STRING,
COSTCTRACTIVITYTYPENAME TYPE STRING,
CHANGEDOCUMENTTABLENAME TYPE STRING,
ACTIVITYTYPEFIELDNAMETEXT TYPE STRING,
DATABASETABLEFIELD TYPE STRING,
CHANGEDOCITEMCHANGETYPETEXT TYPE STRING,
FIRSTNAME TYPE STRING,
LASTNAME TYPE STRING,
FULLNAME TYPE STRING,
ACTIVITYTYPEVALIDITYPERIODTEXT TYPE STRING,
LANGUAGENAME TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CATCHNGLOG_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_CATCHNGLOG_STR-MANDT sy-vline 
WA_CATCHNGLOG_STR-CONTROLLINGAREA sy-vline 
WA_CATCHNGLOG_STR-COSTCTRACTIVITYTYPE sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCUMENTVALIDITYENDDATE sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCVALIDITYSTARTDATE sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCOBJECT sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCUMENT sy-vline 
WA_CATCHNGLOG_STR-ACTIVITYTYPEFIELDNAME sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCITEMCHANGETYPE sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCOBJECTCLASS sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCTABLETECHNICALNAME sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCTABLEKEY sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCNEWFIELDVALUE sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCPREVIOUSFIELDVALUE sy-vline 
WA_CATCHNGLOG_STR-ACTIVITYTYPEVALIDONDATE sy-vline 
WA_CATCHNGLOG_STR-CREATEDBYUSER sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCCREATIONDATE sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCCHANGETIME sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCLANGUAGE sy-vline 
WA_CATCHNGLOG_STR-COSTCTRACTYTYPESEARCHELEMENT sy-vline 
WA_CATCHNGLOG_STR-ALLOCATIONCOSTELEMENT sy-vline 
WA_CATCHNGLOG_STR-COSTELEMENTNAME sy-vline 
WA_CATCHNGLOG_STR-CONTROLLINGAREANAME sy-vline 
WA_CATCHNGLOG_STR-COSTCTRACTIVITYTYPENAME sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCUMENTTABLENAME sy-vline 
WA_CATCHNGLOG_STR-ACTIVITYTYPEFIELDNAMETEXT sy-vline 
WA_CATCHNGLOG_STR-DATABASETABLEFIELD sy-vline 
WA_CATCHNGLOG_STR-CHANGEDOCITEMCHANGETYPETEXT sy-vline 
WA_CATCHNGLOG_STR-FIRSTNAME sy-vline 
WA_CATCHNGLOG_STR-LASTNAME sy-vline 
WA_CATCHNGLOG_STR-FULLNAME sy-vline 
WA_CATCHNGLOG_STR-ACTIVITYTYPEVALIDITYPERIODTEXT sy-vline 
WA_CATCHNGLOG_STR-LANGUAGENAME sy-vline      INTO ld_text SEPARATED BY SPACE.

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