ABAP Select data from SAP table CMCDT_7 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP CMCDT_7 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 CMCDT_7. 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 CMCDT_7 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_CMCDT_7 TYPE STANDARD TABLE OF CMCDT_7,
      WA_CMCDT_7 TYPE CMCDT_7,
      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: <CMCDT_7> TYPE CMCDT_7.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_CMCDT_7.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM CMCDT_7
  INTO TABLE IT_CMCDT_7.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM CMCDT_7
*  INTO TABLE @DATA(IT_CMCDT_72).
*--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_CMCDT_7 INDEX 1 INTO DATA(WA_CMCDT_72).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_CMCDT_7 ASSIGNING <CMCDT_7>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<CMCDT_7>-MANDT = 1.
<CMCDT_7>-HIER_ID = 1.
<CMCDT_7>-CDT7 = 1.
<CMCDT_7>-STRATEGY = 1.
<CMCDT_7>-VKORG = 1.

ENDLOOP.

LOOP AT IT_CMCDT_7 INTO WA_CMCDT_7.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_CMCDT_7-VTWEG, sy-vline,
  WA_CMCDT_7-CDT1, sy-vline,
  WA_CMCDT_7-SHLFSPC, sy-vline,
  WA_CMCDT_7-LINSPC, sy-vline,
  WA_CMCDT_7-SPACEUNIT, sy-vline,
  WA_CMCDT_7-LINUNIT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_CMCDT_7 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_CMCDT_7 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_CMCDT_7 INTO WA_CMCDT_7.


*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 CUNIT, internal->external for field SPACEUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CMCDT_7-SPACEUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMCDT_7-SPACEUNIT.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field LINUNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_CMCDT_7-LINUNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_CMCDT_7-LINUNIT.
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_CMCDT_7_STR, 
MANDT TYPE STRING,
HIER_ID TYPE STRING,
CDT7 TYPE STRING,
STRATEGY TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
CDT1 TYPE STRING,
SHLFSPC TYPE STRING,
LINSPC TYPE STRING,
SPACEUNIT TYPE STRING,
LINUNIT TYPE STRING,
CHKDATE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_CMCDT_7_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_CMCDT_7_STR-MANDT sy-vline 
WA_CMCDT_7_STR-HIER_ID sy-vline 
WA_CMCDT_7_STR-CDT7 sy-vline 
WA_CMCDT_7_STR-STRATEGY sy-vline 
WA_CMCDT_7_STR-VKORG sy-vline 
WA_CMCDT_7_STR-VTWEG sy-vline 
WA_CMCDT_7_STR-CDT1 sy-vline 
WA_CMCDT_7_STR-SHLFSPC sy-vline 
WA_CMCDT_7_STR-LINSPC sy-vline 
WA_CMCDT_7_STR-SPACEUNIT sy-vline 
WA_CMCDT_7_STR-LINUNIT sy-vline 
WA_CMCDT_7_STR-CHKDATE sy-vline      INTO ld_text SEPARATED BY SPACE.

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