ABAP Select data from SAP table PMSGA into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PMSGA
*  INTO TABLE @DATA(IT_PMSGA2).
*--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_PMSGA INDEX 1 INTO DATA(WA_PMSGA2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PMSGA>-TAXNB = 1.
<PMSGA>-REFNB = 1.
<PMSGA>-TOFFC = 1.
<PMSGA>-TAXCL = 1.
<PMSGA>-INTAX = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PMSGA-CHLNB, sy-vline,
  WA_PMSGA-POSOV, sy-vline,
  WA_PMSGA-CONTR, sy-vline,
  WA_PMSGA-TFUPR, sy-vline,
  WA_PMSGA-TAX, sy-vline,
  WA_PMSGA-DOA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PMSGA 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_PMSGA 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_PMSGA INTO WA_PMSGA.


*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_PMSGA_STR, 
TAXNB TYPE STRING,
REFNB TYPE STRING,
TOFFC TYPE STRING,
TAXCL TYPE STRING,
INTAX TYPE STRING,
CHLNB TYPE STRING,
POSOV TYPE STRING,
CONTR TYPE STRING,
TFUPR TYPE STRING,
TAX TYPE STRING,
DOA TYPE STRING,
EXMPT TYPE STRING,
ICTYP TYPE STRING,
ICNUM TYPE STRING,
ICOLD TYPE STRING,
AUTH1 TYPE STRING,
DOCN1 TYPE STRING,
FPDAT TYPE STRING,
EXPID TYPE STRING,
ISSPL TYPE STRING,
ISCOT TYPE STRING,
IDCOT TYPE STRING,
OVCHK TYPE STRING,
ASTAT TYPE STRING,
AKIND TYPE STRING,
REJEC TYPE STRING,
USEFR TYPE STRING,
USETO TYPE STRING,
DATEN TYPE STRING,
DATEU TYPE STRING,
TIMES TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PMSGA_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_PMSGA_STR-TAXNB sy-vline 
WA_PMSGA_STR-REFNB sy-vline 
WA_PMSGA_STR-TOFFC sy-vline 
WA_PMSGA_STR-TAXCL sy-vline 
WA_PMSGA_STR-INTAX sy-vline 
WA_PMSGA_STR-CHLNB sy-vline 
WA_PMSGA_STR-POSOV sy-vline 
WA_PMSGA_STR-CONTR sy-vline 
WA_PMSGA_STR-TFUPR sy-vline 
WA_PMSGA_STR-TAX sy-vline 
WA_PMSGA_STR-DOA sy-vline 
WA_PMSGA_STR-EXMPT sy-vline 
WA_PMSGA_STR-ICTYP sy-vline 
WA_PMSGA_STR-ICNUM sy-vline 
WA_PMSGA_STR-ICOLD sy-vline 
WA_PMSGA_STR-AUTH1 sy-vline 
WA_PMSGA_STR-DOCN1 sy-vline 
WA_PMSGA_STR-FPDAT sy-vline 
WA_PMSGA_STR-EXPID sy-vline 
WA_PMSGA_STR-ISSPL sy-vline 
WA_PMSGA_STR-ISCOT sy-vline 
WA_PMSGA_STR-IDCOT sy-vline 
WA_PMSGA_STR-OVCHK sy-vline 
WA_PMSGA_STR-ASTAT sy-vline 
WA_PMSGA_STR-AKIND sy-vline 
WA_PMSGA_STR-REJEC sy-vline 
WA_PMSGA_STR-USEFR sy-vline 
WA_PMSGA_STR-USETO sy-vline 
WA_PMSGA_STR-DATEN sy-vline 
WA_PMSGA_STR-DATEU sy-vline 
WA_PMSGA_STR-TIMES sy-vline      INTO ld_text SEPARATED BY SPACE.

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