ABAP Select data from SAP table PSA_DISP into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSA_DISP
*  INTO TABLE @DATA(IT_PSA_DISP2).
*--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_PSA_DISP INDEX 1 INTO DATA(WA_PSA_DISP2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSA_DISP>-MANDT = 1.
<PSA_DISP>-DOCNR = 1.
<PSA_DISP>-GJAHR = 1.
<PSA_DISP>-PSC_INPUT = 1.
<PSA_DISP>-PSC_CALC_STEP = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSA_DISP-SCHEME_STEP, sy-vline,
  WA_PSA_DISP-PSC_POSNR, sy-vline,
  WA_PSA_DISP-CURT, sy-vline,
  WA_PSA_DISP-RLDNR, sy-vline,
  WA_PSA_DISP-CURR, sy-vline,
  WA_PSA_DISP-TOT_AMT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSA_DISP 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_PSA_DISP 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_PSA_DISP INTO WA_PSA_DISP.


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

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

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

*Conversion exit CUNIT, internal->external for field UOM
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PSA_DISP-UOM
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSA_DISP-UOM.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field EGRUP
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PSA_DISP-EGRUP
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSA_DISP-EGRUP.
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_PSA_DISP_STR, 
MANDT TYPE STRING,
DOCNR TYPE STRING,
GJAHR TYPE STRING,
PSC_INPUT TYPE STRING,
PSC_CALC_STEP TYPE STRING,
SCHEME_STEP TYPE STRING,
PSC_POSNR TYPE STRING,
CURT TYPE STRING,
RLDNR TYPE STRING,
CURR TYPE STRING,
TOT_AMT TYPE STRING,
CON_AMT TYPE STRING,
CFW_AMT TYPE STRING,
PSC_VOLUME TYPE STRING,
BUKRS TYPE STRING,
PSC_NAME TYPE STRING,
PSC_PRODUCT TYPE STRING,
PSC_GROUP TYPE STRING,
POPER TYPE STRING,
UOM TYPE STRING,
PSC_CALC_TYPE TYPE STRING,
PSC_CALC_TP_KTXT TYPE STRING,
PSC_CALC_TP_LTXT TYPE STRING,
CALC_SCHEME TYPE STRING,
CALC_SCHEME_TXT TYPE STRING,
PSC_PER_COST TYPE STRING,
SPSC_NAME TYPE STRING,
SPSC_PRODUCT TYPE STRING,
PSC_RATE TYPE STRING,
VNAME TYPE STRING,
EGRUP TYPE STRING,
DESCR TYPE STRING,
GOV_AMT TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSA_DISP_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_PSA_DISP_STR-MANDT sy-vline 
WA_PSA_DISP_STR-DOCNR sy-vline 
WA_PSA_DISP_STR-GJAHR sy-vline 
WA_PSA_DISP_STR-PSC_INPUT sy-vline 
WA_PSA_DISP_STR-PSC_CALC_STEP sy-vline 
WA_PSA_DISP_STR-SCHEME_STEP sy-vline 
WA_PSA_DISP_STR-PSC_POSNR sy-vline 
WA_PSA_DISP_STR-CURT sy-vline 
WA_PSA_DISP_STR-RLDNR sy-vline 
WA_PSA_DISP_STR-CURR sy-vline 
WA_PSA_DISP_STR-TOT_AMT sy-vline 
WA_PSA_DISP_STR-CON_AMT sy-vline 
WA_PSA_DISP_STR-CFW_AMT sy-vline 
WA_PSA_DISP_STR-PSC_VOLUME sy-vline 
WA_PSA_DISP_STR-BUKRS sy-vline 
WA_PSA_DISP_STR-PSC_NAME sy-vline 
WA_PSA_DISP_STR-PSC_PRODUCT sy-vline 
WA_PSA_DISP_STR-PSC_GROUP sy-vline 
WA_PSA_DISP_STR-POPER sy-vline 
WA_PSA_DISP_STR-UOM sy-vline 
WA_PSA_DISP_STR-PSC_CALC_TYPE sy-vline 
WA_PSA_DISP_STR-PSC_CALC_TP_KTXT sy-vline 
WA_PSA_DISP_STR-PSC_CALC_TP_LTXT sy-vline 
WA_PSA_DISP_STR-CALC_SCHEME sy-vline 
WA_PSA_DISP_STR-CALC_SCHEME_TXT sy-vline 
WA_PSA_DISP_STR-PSC_PER_COST sy-vline 
WA_PSA_DISP_STR-SPSC_NAME sy-vline 
WA_PSA_DISP_STR-SPSC_PRODUCT sy-vline 
WA_PSA_DISP_STR-PSC_RATE sy-vline 
WA_PSA_DISP_STR-VNAME sy-vline 
WA_PSA_DISP_STR-EGRUP sy-vline 
WA_PSA_DISP_STR-DESCR sy-vline 
WA_PSA_DISP_STR-GOV_AMT sy-vline      INTO ld_text SEPARATED BY SPACE.

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