ABAP Select data from SAP table TEMSG into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM TEMSG
*  INTO TABLE @DATA(IT_TEMSG2).
*--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_TEMSG INDEX 1 INTO DATA(WA_TEMSG2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<TEMSG>-ID = 1.
<TEMSG>-EMTEXT = 1.
<TEMSG>-DATCRE = 1.
<TEMSG>-TIMCRE = 1.
<TEMSG>-DATDEL = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_TEMSG-TIMDEL, sy-vline,
  WA_TEMSG-AUTHOR, sy-vline,
  WA_TEMSG-APPLSERVER, sy-vline,
  WA_TEMSG-NOROW, sy-vline,
  WA_TEMSG-CUROW, sy-vline,
  WA_TEMSG-CLIENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_TEMSG 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_TEMSG 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_TEMSG INTO WA_TEMSG.


*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 ISOLA, internal->external for field LANGU
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_TEMSG-LANGU
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_TEMSG-LANGU.
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_TEMSG_STR, 
ID TYPE STRING,
EMTEXT TYPE STRING,
DATCRE TYPE STRING,
TIMCRE TYPE STRING,
DATDEL TYPE STRING,
TIMDEL TYPE STRING,
AUTHOR TYPE STRING,
APPLSERVER TYPE STRING,
NOROW TYPE STRING,
CUROW TYPE STRING,
CLIENT TYPE STRING,
DATREM TYPE STRING,
TIMREM TYPE STRING,
LANGU TYPE STRING,END OF T_EKKO_STR.
DATA: WA_TEMSG_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_TEMSG_STR-ID sy-vline 
WA_TEMSG_STR-EMTEXT sy-vline 
WA_TEMSG_STR-DATCRE sy-vline 
WA_TEMSG_STR-TIMCRE sy-vline 
WA_TEMSG_STR-DATDEL sy-vline 
WA_TEMSG_STR-TIMDEL sy-vline 
WA_TEMSG_STR-AUTHOR sy-vline 
WA_TEMSG_STR-APPLSERVER sy-vline 
WA_TEMSG_STR-NOROW sy-vline 
WA_TEMSG_STR-CUROW sy-vline 
WA_TEMSG_STR-CLIENT sy-vline 
WA_TEMSG_STR-DATREM sy-vline 
WA_TEMSG_STR-TIMREM sy-vline 
WA_TEMSG_STR-LANGU sy-vline      INTO ld_text SEPARATED BY SPACE.

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