ABAP Select data from SAP table MDQ_RULE_EXP 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 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. 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 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 TYPE STANDARD TABLE OF MDQ_RULE_EXP,
      WA_MDQ_RULE_EXP TYPE MDQ_RULE_EXP,
      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> TYPE MDQ_RULE_EXP.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MDQ_RULE_EXP
*  INTO TABLE @DATA(IT_MDQ_RULE_EXP2).
*--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 INDEX 1 INTO DATA(WA_MDQ_RULE_EXP2).


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

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

ENDLOOP.

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

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


*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-MDQLTYRULEEXPORT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MDQ_RULE_EXP-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_STR, 
CLIENT 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,END OF T_EKKO_STR.
DATA: WA_MDQ_RULE_EXP_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_STR-CLIENT sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTUUID sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORT sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYBUSINESSOBJECTTYPECODE sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTNAME sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTTEXT sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPRTCRTNDATETIME sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTCREATEDBYUSER sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTCHANGEDATETIME sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTCHANGEDBYUSER sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPRTCOMPLTNDATETIME sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPRTCOMPLETEDBYUSER sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTSTATUS sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTVALIDATIONUUID sy-vline 
WA_MDQ_RULE_EXP_STR-MDQLTYRULEEXPORTLOGHANDLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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