ABAP Select data from SAP table MSG01 into internal table

Get Example source ABAP code based on a different SAP table
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Below is a number of ABAP code snippets to demonstrate how to select data from SAP MSG01 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 MSG01. 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 MSG01 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_MSG01 TYPE STANDARD TABLE OF MSG01,
      WA_MSG01 TYPE MSG01,
      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: <MSG01> TYPE MSG01.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_MSG01.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM MSG01
  INTO TABLE IT_MSG01.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM MSG01
*  INTO TABLE @DATA(IT_MSG012).
*--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_MSG01 INDEX 1 INTO DATA(WA_MSG012).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_MSG01 ASSIGNING <MSG01>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<MSG01>-APPL = 1.
<MSG01>-OBJECTKEY = 1.
<MSG01>-TYPE = 1.
<MSG01>-LANGUAGE = 1.
<MSG01>-PARTNER = 1.

ENDLOOP.

LOOP AT IT_MSG01 INTO WA_MSG01.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_MSG01-FUNCTION, sy-vline,
  WA_MSG01-DATE, sy-vline,
  WA_MSG01-TIME, sy-vline,
  WA_MSG01-MEDIUM, sy-vline,
  WA_MSG01-NUMBER, sy-vline,
  WA_MSG01-TIMEFLAG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_MSG01 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_MSG01 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_MSG01 INTO WA_MSG01.


*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 LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_MSG01-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG01-LANGUAGE.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field PARTNER
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_MSG01-PARTNER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG01-PARTNER.
WRITE:/ 'New Value:', ld_input.

*Conversion exit PARVW, internal->external for field FUNCTION
CALL FUNCTION 'CONVERSION_EXIT_PARVW_OUTPUT'
  EXPORTING
    input =                      WA_MSG01-FUNCTION
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG01-FUNCTION.
WRITE:/ 'New Value:', ld_input.

*Conversion exit SPDEV, internal->external for field PRINTER
CALL FUNCTION 'CONVERSION_EXIT_SPDEV_OUTPUT'
  EXPORTING
    input =                      WA_MSG01-PRINTER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_MSG01-PRINTER.
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_MSG01_STR, 
APPL TYPE STRING,
OBJECTKEY TYPE STRING,
TYPE TYPE STRING,
LANGUAGE TYPE STRING,
PARTNER TYPE STRING,
FUNCTION TYPE STRING,
DATE TYPE STRING,
TIME TYPE STRING,
MEDIUM TYPE STRING,
NUMBER TYPE STRING,
TIMEFLAG TYPE STRING,
STATUS TYPE STRING,
PRINTER TYPE STRING,
SPOOL TYPE STRING,
SUFFIX1 TYPE STRING,
SUFFIX2 TYPE STRING,
DELETE TYPE STRING,
IMMED TYPE STRING,
RECEIVER TYPE STRING,
DIVISION TYPE STRING,
COVER TYPE STRING,
COVERTITLE TYPE STRING,
AUTHORITY TYPE STRING,
TELEFAX TYPE STRING,
TELEX TYPE STRING,
TELETEX TYPE STRING,
SELFL TYPE STRING,
SORT TYPE STRING,
TYPENAME TYPE STRING,
FUNCTEXT TYPE STRING,
PRINTERLOC TYPE STRING,
PARTNAME TYPE STRING,
PARTCITY TYPE STRING,
POINTER TYPE STRING,END OF T_EKKO_STR.
DATA: WA_MSG01_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_MSG01_STR-APPL sy-vline 
WA_MSG01_STR-OBJECTKEY sy-vline 
WA_MSG01_STR-TYPE sy-vline 
WA_MSG01_STR-LANGUAGE sy-vline 
WA_MSG01_STR-PARTNER sy-vline 
WA_MSG01_STR-FUNCTION sy-vline 
WA_MSG01_STR-DATE sy-vline 
WA_MSG01_STR-TIME sy-vline 
WA_MSG01_STR-MEDIUM sy-vline 
WA_MSG01_STR-NUMBER sy-vline 
WA_MSG01_STR-TIMEFLAG sy-vline 
WA_MSG01_STR-STATUS sy-vline 
WA_MSG01_STR-PRINTER sy-vline 
WA_MSG01_STR-SPOOL sy-vline 
WA_MSG01_STR-SUFFIX1 sy-vline 
WA_MSG01_STR-SUFFIX2 sy-vline 
WA_MSG01_STR-DELETE sy-vline 
WA_MSG01_STR-IMMED sy-vline 
WA_MSG01_STR-RECEIVER sy-vline 
WA_MSG01_STR-DIVISION sy-vline 
WA_MSG01_STR-COVER sy-vline 
WA_MSG01_STR-COVERTITLE sy-vline 
WA_MSG01_STR-AUTHORITY sy-vline 
WA_MSG01_STR-TELEFAX sy-vline 
WA_MSG01_STR-TELEX sy-vline 
WA_MSG01_STR-TELETEX sy-vline 
WA_MSG01_STR-SELFL sy-vline 
WA_MSG01_STR-SORT sy-vline 
WA_MSG01_STR-TYPENAME sy-vline 
WA_MSG01_STR-FUNCTEXT sy-vline 
WA_MSG01_STR-PRINTERLOC sy-vline 
WA_MSG01_STR-PARTNAME sy-vline 
WA_MSG01_STR-PARTCITY sy-vline 
WA_MSG01_STR-POINTER sy-vline      INTO ld_text SEPARATED BY SPACE.

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