ABAP Select data from SAP table PSI_MX into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PSI_MX 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_MX. 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_MX 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_MX TYPE STANDARD TABLE OF PSI_MX,
      WA_PSI_MX TYPE PSI_MX,
      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_MX> TYPE PSI_MX.

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSI_MX
*  INTO TABLE @DATA(IT_PSI_MX2).
*--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_MX INDEX 1 INTO DATA(WA_PSI_MX2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSI_MX>-PERNR = 1.
<PSI_MX>-EVENT_ID = 1.
<PSI_MX>-EVENT_IT = 1.
<PSI_MX>-MFORMSFLG = 1.
<PSI_MX>-M1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSI_MX-M2, sy-vline,
  WA_PSI_MX-M3, sy-vline,
  WA_PSI_MX-M4, sy-vline,
  WA_PSI_MX-MDC, sy-vline,
  WA_PSI_MX-VRSDOG, sy-vline,
  WA_PSI_MX-EVENT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSI_MX 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_MX 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_MX INTO WA_PSI_MX.


*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_MX_STR, 
PERNR TYPE STRING,
EVENT_ID TYPE STRING,
EVENT_IT TYPE STRING,
MFORMSFLG TYPE STRING,
M1 TYPE STRING,
M2 TYPE STRING,
M3 TYPE STRING,
M4 TYPE STRING,
MDC TYPE STRING,
VRSDOG TYPE STRING,
EVENT TYPE STRING,
KEYDATE TYPE STRING,
MDC_FAMSA TYPE STRING,
MDC_OBJPS TYPE STRING,
CNAME TYPE STRING,
PSTAT TYPE STRING,
PMATS TYPE STRING,
EMSOER 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,
APLNM 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,
VOLPI TYPE STRING,
FIREA TYPE STRING,
FIDAT TYPE STRING,
EMSODC TYPE STRING,
NATIDC TYPE STRING,
NACHND TYPE STRING,
VORNAD TYPE STRING,
VRSDOG TYPE STRING,
EVDAT TYPE STRING,
INSBAD TYPE STRING,
RELSHP TYPE STRING,
EDUEND TYPE STRING,
ADDRDC TYPE STRING,
PSTLDC TYPE STRING,
CNTRDC TYPE STRING,
M2CNAME TYPE STRING,
M2PSTAT TYPE STRING,
M2PMATS TYPE STRING,
M2EMSOER TYPE STRING,
M2EMSOEE TYPE STRING,
M2NACHN TYPE STRING,
M2VORNA TYPE STRING,
M2INSBG TYPE STRING,
M2INSBA TYPE STRING,
M2WOSTA TYPE STRING,
M2WOSTD TYPE STRING,
DAYFI TYPE STRING,
M1_COMM TYPE STRING,
M2_COMM TYPE STRING,
M3_COMM TYPE STRING,
MDC_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,
M2STRAS_ER TYPE STRING,
M2PSTLZ_ER TYPE STRING,
M2ORT01_ER TYPE STRING,
M2OBCINA_ER TYPE STRING,
M2OBCIME_ER TYPE STRING,
M2LANDA_ER TYPE STRING,
M2LANDX50_ER TYPE STRING,
PTXNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSI_MX_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_MX_STR-PERNR sy-vline 
WA_PSI_MX_STR-EVENT_ID sy-vline 
WA_PSI_MX_STR-EVENT_IT sy-vline 
WA_PSI_MX_STR-MFORMSFLG sy-vline 
WA_PSI_MX_STR-M1 sy-vline 
WA_PSI_MX_STR-M2 sy-vline 
WA_PSI_MX_STR-M3 sy-vline 
WA_PSI_MX_STR-M4 sy-vline 
WA_PSI_MX_STR-MDC sy-vline 
WA_PSI_MX_STR-VRSDOG sy-vline 
WA_PSI_MX_STR-EVENT sy-vline 
WA_PSI_MX_STR-KEYDATE sy-vline 
WA_PSI_MX_STR-MDC_FAMSA sy-vline 
WA_PSI_MX_STR-MDC_OBJPS sy-vline 
WA_PSI_MX_STR-CNAME sy-vline 
WA_PSI_MX_STR-PSTAT sy-vline 
WA_PSI_MX_STR-PMATS sy-vline 
WA_PSI_MX_STR-EMSOER sy-vline 
WA_PSI_MX_STR-EMSOEE sy-vline 
WA_PSI_MX_STR-NATIO sy-vline 
WA_PSI_MX_STR-NACHN sy-vline 
WA_PSI_MX_STR-VORNA sy-vline 
WA_PSI_MX_STR-ADDRA sy-vline 
WA_PSI_MX_STR-PSTLA sy-vline 
WA_PSI_MX_STR-CNTRA sy-vline 
WA_PSI_MX_STR-CHGRE sy-vline 
WA_PSI_MX_STR-CHGDT sy-vline 
WA_PSI_MX_STR-INSBG sy-vline 
WA_PSI_MX_STR-INSBA sy-vline 
WA_PSI_MX_STR-WOSTA sy-vline 
WA_PSI_MX_STR-WOSTD sy-vline 
WA_PSI_MX_STR-MATSO sy-vline 
WA_PSI_MX_STR-APLNM sy-vline 
WA_PSI_MX_STR-PERMN sy-vline 
WA_PSI_MX_STR-PERED sy-vline 
WA_PSI_MX_STR-EDUCA sy-vline 
WA_PSI_MX_STR-EDUTY sy-vline 
WA_PSI_MX_STR-EDUAR sy-vline 
WA_PSI_MX_STR-STJOB sy-vline 
WA_PSI_MX_STR-WCNTR sy-vline 
WA_PSI_MX_STR-SCHKZ sy-vline 
WA_PSI_MX_STR-TRGCN sy-vline 
WA_PSI_MX_STR-ITYPE sy-vline 
WA_PSI_MX_STR-VOLPI sy-vline 
WA_PSI_MX_STR-FIREA sy-vline 
WA_PSI_MX_STR-FIDAT sy-vline 
WA_PSI_MX_STR-EMSODC sy-vline 
WA_PSI_MX_STR-NATIDC sy-vline 
WA_PSI_MX_STR-NACHND sy-vline 
WA_PSI_MX_STR-VORNAD sy-vline 
WA_PSI_MX_STR-VRSDOG sy-vline 
WA_PSI_MX_STR-EVDAT sy-vline 
WA_PSI_MX_STR-INSBAD sy-vline 
WA_PSI_MX_STR-RELSHP sy-vline 
WA_PSI_MX_STR-EDUEND sy-vline 
WA_PSI_MX_STR-ADDRDC sy-vline 
WA_PSI_MX_STR-PSTLDC sy-vline 
WA_PSI_MX_STR-CNTRDC sy-vline 
WA_PSI_MX_STR-M2CNAME sy-vline 
WA_PSI_MX_STR-M2PSTAT sy-vline 
WA_PSI_MX_STR-M2PMATS sy-vline 
WA_PSI_MX_STR-M2EMSOER sy-vline 
WA_PSI_MX_STR-M2EMSOEE sy-vline 
WA_PSI_MX_STR-M2NACHN sy-vline 
WA_PSI_MX_STR-M2VORNA sy-vline 
WA_PSI_MX_STR-M2INSBG sy-vline 
WA_PSI_MX_STR-M2INSBA sy-vline 
WA_PSI_MX_STR-M2WOSTA sy-vline 
WA_PSI_MX_STR-M2WOSTD sy-vline 
WA_PSI_MX_STR-DAYFI sy-vline 
WA_PSI_MX_STR-M1_COMM sy-vline 
WA_PSI_MX_STR-M2_COMM sy-vline 
WA_PSI_MX_STR-M3_COMM sy-vline 
WA_PSI_MX_STR-MDC_COMM sy-vline 
WA_PSI_MX_STR-STRAS_ER sy-vline 
WA_PSI_MX_STR-PSTLZ_ER sy-vline 
WA_PSI_MX_STR-ORT01_ER sy-vline 
WA_PSI_MX_STR-OBCINA_ER sy-vline 
WA_PSI_MX_STR-OBCIME_ER sy-vline 
WA_PSI_MX_STR-LANDA_ER sy-vline 
WA_PSI_MX_STR-LANDX50_ER sy-vline 
WA_PSI_MX_STR-M2STRAS_ER sy-vline 
WA_PSI_MX_STR-M2PSTLZ_ER sy-vline 
WA_PSI_MX_STR-M2ORT01_ER sy-vline 
WA_PSI_MX_STR-M2OBCINA_ER sy-vline 
WA_PSI_MX_STR-M2OBCIME_ER sy-vline 
WA_PSI_MX_STR-M2LANDA_ER sy-vline 
WA_PSI_MX_STR-M2LANDX50_ER sy-vline 
WA_PSI_MX_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.