ABAP Select data from SAP table /MRSS/C_PREMK into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /MRSS/C_PREMK 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 /MRSS/C_PREMK. 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 /MRSS/C_PREMK 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_/MRSS/C_PREMK TYPE STANDARD TABLE OF /MRSS/C_PREMK,
      WA_/MRSS/C_PREMK TYPE /MRSS/C_PREMK,
      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: </MRSS/C_PREMK> TYPE /MRSS/C_PREMK.

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /MRSS/C_PREMK
  INTO TABLE IT_/MRSS/C_PREMK.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /MRSS/C_PREMK
*  INTO TABLE @DATA(IT_/MRSS/C_PREMK2).
*--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_/MRSS/C_PREMK INDEX 1 INTO DATA(WA_/MRSS/C_PREMK2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/MRSS/C_PREMK ASSIGNING </MRSS/C_PREMK>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</MRSS/C_PREMK>-MANDT = 1.
</MRSS/C_PREMK>-WERKS = 1.
</MRSS/C_PREMK>-BTRTL = 1.
</MRSS/C_PREMK>-PERSG = 1.
</MRSS/C_PREMK>-PERSK = 1.

ENDLOOP.

LOOP AT IT_/MRSS/C_PREMK INTO WA_/MRSS/C_PREMK.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/MRSS/C_PREMK-ABKRS, sy-vline,
  WA_/MRSS/C_PREMK-BUKRS, sy-vline,
  WA_/MRSS/C_PREMK-KOSTL, sy-vline,
  WA_/MRSS/C_PREMK-ORGEH, sy-vline,
  WA_/MRSS/C_PREMK-VDSK1, sy-vline,
  WA_/MRSS/C_PREMK-SBMOD, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/MRSS/C_PREMK 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_/MRSS/C_PREMK 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_/MRSS/C_PREMK INTO WA_/MRSS/C_PREMK.


*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 KOSTL
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/MRSS/C_PREMK-KOSTL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/MRSS/C_PREMK-KOSTL.
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_/MRSS/C_PREMK_STR, 
MANDT TYPE STRING,
WERKS TYPE STRING,
BTRTL TYPE STRING,
PERSG TYPE STRING,
PERSK TYPE STRING,
ABKRS TYPE STRING,
BUKRS TYPE STRING,
KOSTL TYPE STRING,
ORGEH TYPE STRING,
VDSK1 TYPE STRING,
SBMOD TYPE STRING,
SACHZ TYPE STRING,
NCHMC TYPE STRING,
VNAMC TYPE STRING,
PERNR TYPE STRING,
ENAME TYPE STRING,
BEGDA_0001 TYPE STRING,
ENDDA_0001 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/MRSS/C_PREMK_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_/MRSS/C_PREMK_STR-MANDT sy-vline 
WA_/MRSS/C_PREMK_STR-WERKS sy-vline 
WA_/MRSS/C_PREMK_STR-BTRTL sy-vline 
WA_/MRSS/C_PREMK_STR-PERSG sy-vline 
WA_/MRSS/C_PREMK_STR-PERSK sy-vline 
WA_/MRSS/C_PREMK_STR-ABKRS sy-vline 
WA_/MRSS/C_PREMK_STR-BUKRS sy-vline 
WA_/MRSS/C_PREMK_STR-KOSTL sy-vline 
WA_/MRSS/C_PREMK_STR-ORGEH sy-vline 
WA_/MRSS/C_PREMK_STR-VDSK1 sy-vline 
WA_/MRSS/C_PREMK_STR-SBMOD sy-vline 
WA_/MRSS/C_PREMK_STR-SACHZ sy-vline 
WA_/MRSS/C_PREMK_STR-NCHMC sy-vline 
WA_/MRSS/C_PREMK_STR-VNAMC sy-vline 
WA_/MRSS/C_PREMK_STR-PERNR sy-vline 
WA_/MRSS/C_PREMK_STR-ENAME sy-vline 
WA_/MRSS/C_PREMK_STR-BEGDA_0001 sy-vline 
WA_/MRSS/C_PREMK_STR-ENDDA_0001 sy-vline      INTO ld_text SEPARATED BY SPACE.

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