ABAP Select data from SAP table MDQ_RULE_EXP_D into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDQ_RULE_EXP_D
*  INTO TABLE @DATA(IT_MDQ_RULE_EXP_D2).
*--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_MDQ_RULE_EXP_D INDEX 1 INTO DATA(WA_MDQ_RULE_EXP_D2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MDQ_RULE_EXP_D>-MANDT = 1.
<MDQ_RULE_EXP_D>-MDQLTYRULEEXPORTUUID = 1.
<MDQ_RULE_EXP_D>-MDQLTYRULEEXPORT = 1.
<MDQ_RULE_EXP_D>-MDQLTYBUSINESSOBJECTTYPECODE = 1.
<MDQ_RULE_EXP_D>-MDQLTYRULEEXPORTNAME = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPORTTEXT, sy-vline,
  WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPRTCRTNDATETIME, sy-vline,
  WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPORTCREATEDBYUSER, sy-vline,
  WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPORTCHANGEDATETIME, sy-vline,
  WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPORTCHANGEDBYUSER, sy-vline,
  WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPRTCOMPLTNDATETIME, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MDQ_RULE_EXP_D 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_MDQ_RULE_EXP_D 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_MDQ_RULE_EXP_D INTO WA_MDQ_RULE_EXP_D.


*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 MDQLTYRULEEXPORT
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPORT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDQ_RULE_EXP_D-MDQLTYRULEEXPORT.
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_MDQ_RULE_EXP_D_STR, 
MANDT TYPE STRING,
MDQLTYRULEEXPORTUUID TYPE STRING,
MDQLTYRULEEXPORT TYPE STRING,
MDQLTYBUSINESSOBJECTTYPECODE TYPE STRING,
MDQLTYRULEEXPORTNAME TYPE STRING,
MDQLTYRULEEXPORTTEXT TYPE STRING,
MDQLTYRULEEXPRTCRTNDATETIME TYPE STRING,
MDQLTYRULEEXPORTCREATEDBYUSER TYPE STRING,
MDQLTYRULEEXPORTCHANGEDATETIME TYPE STRING,
MDQLTYRULEEXPORTCHANGEDBYUSER TYPE STRING,
MDQLTYRULEEXPRTCOMPLTNDATETIME TYPE STRING,
MDQLTYRULEEXPRTCOMPLETEDBYUSER TYPE STRING,
MDQLTYRULEEXPORTSTATUS TYPE STRING,
MDQLTYRULEEXPORTVALIDATIONUUID TYPE STRING,
MDQLTYRULEEXPORTLOGHANDLE TYPE STRING,
ACTIVEUUID TYPE STRING,
HASACTIVEENTITY TYPE STRING,
DRAFTENTITYCREATIONDATETIME TYPE STRING,
DRAFTENTITYLASTCHANGEDATETIME TYPE STRING,
DRAFTADMINISTRATIVEDATAUUID TYPE STRING,
DRAFTENTITYCONSISTENCYSTATUS TYPE STRING,
DRAFTENTITYOPERATIONCODE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MDQ_RULE_EXP_D_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_MDQ_RULE_EXP_D_STR-MANDT sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTUUID sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORT sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYBUSINESSOBJECTTYPECODE sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTNAME sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTTEXT sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPRTCRTNDATETIME sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTCREATEDBYUSER sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTCHANGEDATETIME sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTCHANGEDBYUSER sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPRTCOMPLTNDATETIME sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPRTCOMPLETEDBYUSER sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTSTATUS sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTVALIDATIONUUID sy-vline 
WA_MDQ_RULE_EXP_D_STR-MDQLTYRULEEXPORTLOGHANDLE sy-vline 
WA_MDQ_RULE_EXP_D_STR-ACTIVEUUID sy-vline 
WA_MDQ_RULE_EXP_D_STR-HASACTIVEENTITY sy-vline 
WA_MDQ_RULE_EXP_D_STR-DRAFTENTITYCREATIONDATETIME sy-vline 
WA_MDQ_RULE_EXP_D_STR-DRAFTENTITYLASTCHANGEDATETIME sy-vline 
WA_MDQ_RULE_EXP_D_STR-DRAFTADMINISTRATIVEDATAUUID sy-vline 
WA_MDQ_RULE_EXP_D_STR-DRAFTENTITYCONSISTENCYSTATUS sy-vline 
WA_MDQ_RULE_EXP_D_STR-DRAFTENTITYOPERATIONCODE sy-vline      INTO ld_text SEPARATED BY SPACE.

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