ABAP Select data from SAP table CMETTP into internal table

Get Example source ABAP code based on a different SAP table
  Get ABAP code

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMETTP
*  INTO TABLE @DATA(IT_CMETTP2).
*--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_CMETTP INDEX 1 INTO DATA(WA_CMETTP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMETTP>-MANDT = 1.
<CMETTP>-MISSIONESSENTIALTASKUUID = 1.
<CMETTP>-MSNESNLTSKPARENTUUID = 1.
<CMETTP>-MSNESNLTSKROOTUUID = 1.
<CMETTP>-MISSIONESSENTIALTASKID = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMETTP-MSNESNLTSKNAME, sy-vline,
  WA_CMETTP-MSNESNLTSKDESCRIPTION, sy-vline,
  WA_CMETTP-MSNESNLTSKSHORTNAME, sy-vline,
  WA_CMETTP-MSNESNLTSKVALIDITYSTARTDTE, sy-vline,
  WA_CMETTP-MSNESNLTSKVALIDITYENDDTE, sy-vline,
  WA_CMETTP-MSNESNLTSKCREATIONDTETME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMETTP 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_CMETTP 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_CMETTP INTO WA_CMETTP.


*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 MISSIONESSENTIALTASKID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMETTP-MISSIONESSENTIALTASKID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMETTP-MISSIONESSENTIALTASKID.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field MSNESNLTSKPARENTID
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_CMETTP-MSNESNLTSKPARENTID
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMETTP-MSNESNLTSKPARENTID.
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_CMETTP_STR, 
MANDT TYPE STRING,
MISSIONESSENTIALTASKUUID TYPE STRING,
MSNESNLTSKPARENTUUID TYPE STRING,
MSNESNLTSKROOTUUID TYPE STRING,
MISSIONESSENTIALTASKID TYPE STRING,
MSNESNLTSKNAME TYPE STRING,
MSNESNLTSKDESCRIPTION TYPE STRING,
MSNESNLTSKSHORTNAME TYPE STRING,
MSNESNLTSKVALIDITYSTARTDTE TYPE STRING,
MSNESNLTSKVALIDITYENDDTE TYPE STRING,
MSNESNLTSKCREATIONDTETME TYPE STRING,
MSNESNLTSKCREATEDBYUSER TYPE STRING,
MSNESNLTSKLASTCHGDDTETME TYPE STRING,
MSNESNLTSKLASTCHGDBYUSER TYPE STRING,
MSNESNLTSKTYPENAME TYPE STRING,
MSNESNLTSKTYPEISROOTTASKTYPE TYPE STRING,
MSNESNLTSKTYPE TYPE STRING,
MSNESNLTSKSTATUSOBJECTID TYPE STRING,
MSNESNLTSKTRNGPLNTEXT TYPE STRING,
MSNESNLTSKPARENTID TYPE STRING,
MSNESNLTSKPARENTNAME TYPE STRING,
STATUS TYPE STRING,
STATUSPROFILE TYPE STRING,
MSNESNLTSKSTATUSCODE TYPE STRING,
STATUSCRITICALITY TYPE STRING,
DFSCAPABILITYOBJECTID TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMETTP_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_CMETTP_STR-MANDT sy-vline 
WA_CMETTP_STR-MISSIONESSENTIALTASKUUID sy-vline 
WA_CMETTP_STR-MSNESNLTSKPARENTUUID sy-vline 
WA_CMETTP_STR-MSNESNLTSKROOTUUID sy-vline 
WA_CMETTP_STR-MISSIONESSENTIALTASKID sy-vline 
WA_CMETTP_STR-MSNESNLTSKNAME sy-vline 
WA_CMETTP_STR-MSNESNLTSKDESCRIPTION sy-vline 
WA_CMETTP_STR-MSNESNLTSKSHORTNAME sy-vline 
WA_CMETTP_STR-MSNESNLTSKVALIDITYSTARTDTE sy-vline 
WA_CMETTP_STR-MSNESNLTSKVALIDITYENDDTE sy-vline 
WA_CMETTP_STR-MSNESNLTSKCREATIONDTETME sy-vline 
WA_CMETTP_STR-MSNESNLTSKCREATEDBYUSER sy-vline 
WA_CMETTP_STR-MSNESNLTSKLASTCHGDDTETME sy-vline 
WA_CMETTP_STR-MSNESNLTSKLASTCHGDBYUSER sy-vline 
WA_CMETTP_STR-MSNESNLTSKTYPENAME sy-vline 
WA_CMETTP_STR-MSNESNLTSKTYPEISROOTTASKTYPE sy-vline 
WA_CMETTP_STR-MSNESNLTSKTYPE sy-vline 
WA_CMETTP_STR-MSNESNLTSKSTATUSOBJECTID sy-vline 
WA_CMETTP_STR-MSNESNLTSKTRNGPLNTEXT sy-vline 
WA_CMETTP_STR-MSNESNLTSKPARENTID sy-vline 
WA_CMETTP_STR-MSNESNLTSKPARENTNAME sy-vline 
WA_CMETTP_STR-STATUS sy-vline 
WA_CMETTP_STR-STATUSPROFILE sy-vline 
WA_CMETTP_STR-MSNESNLTSKSTATUSCODE sy-vline 
WA_CMETTP_STR-STATUSCRITICALITY sy-vline 
WA_CMETTP_STR-DFSCAPABILITYOBJECTID sy-vline      INTO ld_text SEPARATED BY SPACE.

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