ABAP Select data from SAP table MWS_CHAR into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MWS_CHAR
*  INTO TABLE @DATA(IT_MWS_CHAR2).
*--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_MWS_CHAR INDEX 1 INTO DATA(WA_MWS_CHAR2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MWS_CHAR>-ATNAM = 1.
<MWS_CHAR>-ATINN = 1.
<MWS_CHAR>-ATBEZ = 1.
<MWS_CHAR>-MSEHI = 1.
<MWS_CHAR>-MSEH6 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MWS_CHAR-ATFOR, sy-vline,
  WA_MWS_CHAR-ATEIN, sy-vline,
  WA_MWS_CHAR-ATSON, sy-vline,
  WA_MWS_CHAR-ANZST, sy-vline,
  WA_MWS_CHAR-ANZDZ, sy-vline,
  WA_MWS_CHAR-ATDIM, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MWS_CHAR 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_MWS_CHAR 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_MWS_CHAR INTO WA_MWS_CHAR.


*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 ATINN, internal->external for field ATINN
CALL FUNCTION 'CONVERSION_EXIT_ATINN_OUTPUT'
  EXPORTING
    input =                      WA_MWS_CHAR-ATINN
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWS_CHAR-ATINN.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field MSEHI
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_MWS_CHAR-MSEHI
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MWS_CHAR-MSEHI.
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_MWS_CHAR_STR, 
ATNAM TYPE STRING,
ATINN TYPE STRING,
ATBEZ TYPE STRING,
MSEHI TYPE STRING,
MSEH6 TYPE STRING,
ATFOR TYPE STRING,
ATEIN TYPE STRING,
ATSON TYPE STRING,
ANZST TYPE STRING,
ANZDZ TYPE STRING,
ATDIM TYPE STRING,
ATDEX TYPE STRING,
ATVOR TYPE STRING,
ATSCH TYPE STRING,
SICHT TYPE STRING,
ATWRT TYPE STRING,
STATE TYPE STRING,
VALUE TYPE STRING,
XUSED TYPE STRING,
XVALC TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MWS_CHAR_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_MWS_CHAR_STR-ATNAM sy-vline 
WA_MWS_CHAR_STR-ATINN sy-vline 
WA_MWS_CHAR_STR-ATBEZ sy-vline 
WA_MWS_CHAR_STR-MSEHI sy-vline 
WA_MWS_CHAR_STR-MSEH6 sy-vline 
WA_MWS_CHAR_STR-ATFOR sy-vline 
WA_MWS_CHAR_STR-ATEIN sy-vline 
WA_MWS_CHAR_STR-ATSON sy-vline 
WA_MWS_CHAR_STR-ANZST sy-vline 
WA_MWS_CHAR_STR-ANZDZ sy-vline 
WA_MWS_CHAR_STR-ATDIM sy-vline 
WA_MWS_CHAR_STR-ATDEX sy-vline 
WA_MWS_CHAR_STR-ATVOR sy-vline 
WA_MWS_CHAR_STR-ATSCH sy-vline 
WA_MWS_CHAR_STR-SICHT sy-vline 
WA_MWS_CHAR_STR-ATWRT sy-vline 
WA_MWS_CHAR_STR-STATE sy-vline 
WA_MWS_CHAR_STR-VALUE sy-vline 
WA_MWS_CHAR_STR-XUSED sy-vline 
WA_MWS_CHAR_STR-XVALC sy-vline      INTO ld_text SEPARATED BY SPACE.

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