ABAP Select data from SAP table MYLEARNING_MAILFEEDBACK_ST into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MYLEARNING_MAILFEEDBACK_ST
*  INTO TABLE @DATA(IT_MYLEARNING_MAILFEEDBACK_ST2).
*--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_MYLEARNING_MAILFEEDBACK_ST INDEX 1 INTO DATA(WA_MYLEARNING_MAILFEEDBACK_ST2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MYLEARNING_MAILFEEDBACK_ST>-FEEDBACKTOPIC = 1.
<MYLEARNING_MAILFEEDBACK_ST>-OVERALLRATING = 1.
<MYLEARNING_MAILFEEDBACK_ST>-RELEVANTFEEDBACK = 1.
<MYLEARNING_MAILFEEDBACK_ST>-EASYUSEFEEDBACK = 1.
<MYLEARNING_MAILFEEDBACK_ST>-QUALITYFEEDBACK = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MYLEARNING_MAILFEEDBACK_ST-HELPFEEDBACK, sy-vline,
  WA_MYLEARNING_MAILFEEDBACK_ST-LIKEFEEDBACK, sy-vline,
  WA_MYLEARNING_MAILFEEDBACK_ST-IMPROVEFEEDBACK, sy-vline,
  WA_MYLEARNING_MAILFEEDBACK_ST-PROMOTESCORE, sy-vline,
  WA_MYLEARNING_MAILFEEDBACK_ST-ROLE, sy-vline,
ENDLOOP.
   
*Add any further fields from structure WA_MYLEARNING_MAILFEEDBACK_ST 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_MYLEARNING_MAILFEEDBACK_ST 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_MYLEARNING_MAILFEEDBACK_ST INTO WA_MYLEARNING_MAILFEEDBACK_ST.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_MYLEARNING_MAILFEEDBACK_ST_STR, 
FEEDBACKTOPIC TYPE STRING,
OVERALLRATING TYPE STRING,
RELEVANTFEEDBACK TYPE STRING,
EASYUSEFEEDBACK TYPE STRING,
QUALITYFEEDBACK TYPE STRING,
HELPFEEDBACK TYPE STRING,
LIKEFEEDBACK TYPE STRING,
IMPROVEFEEDBACK TYPE STRING,
PROMOTESCORE TYPE STRING,
ROLE TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MYLEARNING_MAILFEEDBACK_ST_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_MYLEARNING_MAILFEEDBACK_ST_STR-FEEDBACKTOPIC sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-OVERALLRATING sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-RELEVANTFEEDBACK sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-EASYUSEFEEDBACK sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-QUALITYFEEDBACK sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-HELPFEEDBACK sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-LIKEFEEDBACK sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-IMPROVEFEEDBACK sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-PROMOTESCORE sy-vline 
WA_MYLEARNING_MAILFEEDBACK_ST_STR-ROLE sy-vline      INTO ld_text SEPARATED BY SPACE.

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