ABAP Select data from SAP table KNA1_PSO into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP KNA1_PSO 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 KNA1_PSO. 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 KNA1_PSO 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_KNA1_PSO TYPE STANDARD TABLE OF KNA1_PSO,
      WA_KNA1_PSO TYPE KNA1_PSO,
      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: <KNA1_PSO> TYPE KNA1_PSO.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_KNA1_PSO.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM KNA1_PSO
  INTO TABLE IT_KNA1_PSO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM KNA1_PSO
*  INTO TABLE @DATA(IT_KNA1_PSO2).
*--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_KNA1_PSO INDEX 1 INTO DATA(WA_KNA1_PSO2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_KNA1_PSO ASSIGNING <KNA1_PSO>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<KNA1_PSO>-PSOIS = 1.
<KNA1_PSO>-PSON1 = 1.
<KNA1_PSO>-PSON2 = 1.
<KNA1_PSO>-PSON3 = 1.
<KNA1_PSO>-PSOVN = 1.

ENDLOOP.

LOOP AT IT_KNA1_PSO INTO WA_KNA1_PSO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_KNA1_PSO-PSOTL, sy-vline,
  WA_KNA1_PSO-PSOO1, sy-vline,
  WA_KNA1_PSO-PSOO2, sy-vline,
  WA_KNA1_PSO-PSOO3, sy-vline,
  WA_KNA1_PSO-PSOO4, sy-vline,
  WA_KNA1_PSO-PSOO5, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_KNA1_PSO 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_KNA1_PSO 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_KNA1_PSO INTO WA_KNA1_PSO.


*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_KNA1_PSO_STR, 
PSOIS TYPE STRING,
PSON1 TYPE STRING,
PSON2 TYPE STRING,
PSON3 TYPE STRING,
PSOVN TYPE STRING,
PSOTL TYPE STRING,
PSOO1 TYPE STRING,
PSOO2 TYPE STRING,
PSOO3 TYPE STRING,
PSOO4 TYPE STRING,
PSOO5 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_KNA1_PSO_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_KNA1_PSO_STR-PSOIS sy-vline 
WA_KNA1_PSO_STR-PSON1 sy-vline 
WA_KNA1_PSO_STR-PSON2 sy-vline 
WA_KNA1_PSO_STR-PSON3 sy-vline 
WA_KNA1_PSO_STR-PSOVN sy-vline 
WA_KNA1_PSO_STR-PSOTL sy-vline 
WA_KNA1_PSO_STR-PSOO1 sy-vline 
WA_KNA1_PSO_STR-PSOO2 sy-vline 
WA_KNA1_PSO_STR-PSOO3 sy-vline 
WA_KNA1_PSO_STR-PSOO4 sy-vline 
WA_KNA1_PSO_STR-PSOO5 sy-vline      INTO ld_text SEPARATED BY SPACE.

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