ABAP Select data from SAP table ISU_WUI_MSG_SINGLE into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM ISU_WUI_MSG_SINGLE
*  INTO TABLE @DATA(IT_ISU_WUI_MSG_SINGLE2).
*--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_ISU_WUI_MSG_SINGLE INDEX 1 INTO DATA(WA_ISU_WUI_MSG_SINGLE2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<ISU_WUI_MSG_SINGLE>-MSGTY = 1.
<ISU_WUI_MSG_SINGLE>-MSGNO = 1.
<ISU_WUI_MSG_SINGLE>-MSGID = 1.
<ISU_WUI_MSG_SINGLE>-MSGV1 = 1.
<ISU_WUI_MSG_SINGLE>-MSGV2 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_ISU_WUI_MSG_SINGLE-MSGV3, sy-vline,
  WA_ISU_WUI_MSG_SINGLE-MSGV4, sy-vline,
  WA_ISU_WUI_MSG_SINGLE-EXCEPTION, sy-vline,
  WA_ISU_WUI_MSG_SINGLE-PARAM, sy-vline,
  WA_ISU_WUI_MSG_SINGLE-HANDLE, sy-vline,
  WA_ISU_WUI_MSG_SINGLE-SUB_OBJECT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_ISU_WUI_MSG_SINGLE 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_ISU_WUI_MSG_SINGLE 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_ISU_WUI_MSG_SINGLE INTO WA_ISU_WUI_MSG_SINGLE.


*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_ISU_WUI_MSG_SINGLE_STR, 
MSGTY TYPE STRING,
MSGNO TYPE STRING,
MSGID TYPE STRING,
MSGV1 TYPE STRING,
MSGV2 TYPE STRING,
MSGV3 TYPE STRING,
MSGV4 TYPE STRING,
EXCEPTION TYPE STRING,
PARAM TYPE STRING,
HANDLE TYPE STRING,
SUB_OBJECT TYPE STRING,
TEXT_NAME TYPE STRING,
TEXT_PARMS TYPE STRING,
MSGTY TYPE STRING,
LOG TYPE STRING,
DELAY TYPE STRING,
TIME_STMP TYPE STRING,END OF T_EKKO_STR.
DATA: WA_ISU_WUI_MSG_SINGLE_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_ISU_WUI_MSG_SINGLE_STR-MSGTY sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGNO sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGID sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGV1 sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGV2 sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGV3 sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGV4 sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-EXCEPTION sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-PARAM sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-HANDLE sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-SUB_OBJECT sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-TEXT_NAME sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-TEXT_PARMS sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-MSGTY sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-LOG sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-DELAY sy-vline 
WA_ISU_WUI_MSG_SINGLE_STR-TIME_STMP sy-vline      INTO ld_text SEPARATED BY SPACE.

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