ABAP Select data from SAP table PSI_M3 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PSI_M3 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 PSI_M3. 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 PSI_M3 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_PSI_M3 TYPE STANDARD TABLE OF PSI_M3,
      WA_PSI_M3 TYPE PSI_M3,
      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: <PSI_M3> TYPE PSI_M3.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PSI_M3.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PSI_M3
  INTO TABLE IT_PSI_M3.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSI_M3
*  INTO TABLE @DATA(IT_PSI_M32).
*--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_PSI_M3 INDEX 1 INTO DATA(WA_PSI_M32).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PSI_M3 ASSIGNING <PSI_M3>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSI_M3>-PERNR = 1.
<PSI_M3>-EVENT = 1.
<PSI_M3>-CNAME = 1.
<PSI_M3>-PSTAT = 1.
<PSI_M3>-PMATS = 1.

ENDLOOP.

LOOP AT IT_PSI_M3 INTO WA_PSI_M3.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSI_M3-EMSOEE, sy-vline,
  WA_PSI_M3-NATIO, sy-vline,
  WA_PSI_M3-NACHN, sy-vline,
  WA_PSI_M3-VORNA, sy-vline,
  WA_PSI_M3-ADDRA, sy-vline,
  WA_PSI_M3-PSTLA, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSI_M3 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_PSI_M3 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_PSI_M3 INTO WA_PSI_M3.


*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_PSI_M3_STR, 
PERNR TYPE STRING,
EVENT TYPE STRING,
CNAME TYPE STRING,
PSTAT TYPE STRING,
PMATS TYPE STRING,
EMSOEE TYPE STRING,
NATIO TYPE STRING,
NACHN TYPE STRING,
VORNA TYPE STRING,
ADDRA TYPE STRING,
PSTLA TYPE STRING,
CNTRA TYPE STRING,
CHGRE TYPE STRING,
CHGDT TYPE STRING,
INSBG TYPE STRING,
INSBA TYPE STRING,
WOSTA TYPE STRING,
WOSTD TYPE STRING,
MATSO TYPE STRING,
PERMN TYPE STRING,
PERED TYPE STRING,
EDUCA TYPE STRING,
EDUTY TYPE STRING,
EDUAR TYPE STRING,
STJOB TYPE STRING,
WCNTR TYPE STRING,
SCHKZ TYPE STRING,
TRGCN TYPE STRING,
ITYPE TYPE STRING,
DAYFI TYPE STRING,
M3_COMM TYPE STRING,
STRAS_ER TYPE STRING,
PSTLZ_ER TYPE STRING,
ORT01_ER TYPE STRING,
OBCINA_ER TYPE STRING,
OBCIME_ER TYPE STRING,
LANDA_ER TYPE STRING,
LANDX50_ER TYPE STRING,
PTXNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSI_M3_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_PSI_M3_STR-PERNR sy-vline 
WA_PSI_M3_STR-EVENT sy-vline 
WA_PSI_M3_STR-CNAME sy-vline 
WA_PSI_M3_STR-PSTAT sy-vline 
WA_PSI_M3_STR-PMATS sy-vline 
WA_PSI_M3_STR-EMSOEE sy-vline 
WA_PSI_M3_STR-NATIO sy-vline 
WA_PSI_M3_STR-NACHN sy-vline 
WA_PSI_M3_STR-VORNA sy-vline 
WA_PSI_M3_STR-ADDRA sy-vline 
WA_PSI_M3_STR-PSTLA sy-vline 
WA_PSI_M3_STR-CNTRA sy-vline 
WA_PSI_M3_STR-CHGRE sy-vline 
WA_PSI_M3_STR-CHGDT sy-vline 
WA_PSI_M3_STR-INSBG sy-vline 
WA_PSI_M3_STR-INSBA sy-vline 
WA_PSI_M3_STR-WOSTA sy-vline 
WA_PSI_M3_STR-WOSTD sy-vline 
WA_PSI_M3_STR-MATSO sy-vline 
WA_PSI_M3_STR-PERMN sy-vline 
WA_PSI_M3_STR-PERED sy-vline 
WA_PSI_M3_STR-EDUCA sy-vline 
WA_PSI_M3_STR-EDUTY sy-vline 
WA_PSI_M3_STR-EDUAR sy-vline 
WA_PSI_M3_STR-STJOB sy-vline 
WA_PSI_M3_STR-WCNTR sy-vline 
WA_PSI_M3_STR-SCHKZ sy-vline 
WA_PSI_M3_STR-TRGCN sy-vline 
WA_PSI_M3_STR-ITYPE sy-vline 
WA_PSI_M3_STR-DAYFI sy-vline 
WA_PSI_M3_STR-M3_COMM sy-vline 
WA_PSI_M3_STR-STRAS_ER sy-vline 
WA_PSI_M3_STR-PSTLZ_ER sy-vline 
WA_PSI_M3_STR-ORT01_ER sy-vline 
WA_PSI_M3_STR-OBCINA_ER sy-vline 
WA_PSI_M3_STR-OBCIME_ER sy-vline 
WA_PSI_M3_STR-LANDA_ER sy-vline 
WA_PSI_M3_STR-LANDX50_ER sy-vline 
WA_PSI_M3_STR-PTXNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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