ABAP Select data from SAP table PSTHIRD into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSTHIRD
*  INTO TABLE @DATA(IT_PSTHIRD2).
*--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_PSTHIRD INDEX 1 INTO DATA(WA_PSTHIRD2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSTHIRD>-CRETY = 1.
<PSTHIRD>-CRENR = 1.
<PSTHIRD>-LIFNR1 = 1.
<PSTHIRD>-LIFNR2 = 1.
<PSTHIRD>-LIFNR3 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSTHIRD-AGCOD, sy-vline,
  WA_PSTHIRD-LIFSG1, sy-vline,
  WA_PSTHIRD-LIFSG2, sy-vline,
  WA_PSTHIRD-LIFSG3, sy-vline,
  WA_PSTHIRD-RULNR, sy-vline,
  WA_PSTHIRD-IOSCI, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSTHIRD 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_PSTHIRD 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_PSTHIRD INTO WA_PSTHIRD.


*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 LIFNR1
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PSTHIRD-LIFNR1
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSTHIRD-LIFNR1.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR2
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PSTHIRD-LIFNR2
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSTHIRD-LIFNR2.
WRITE:/ 'New Value:', ld_input.

*Conversion exit ALPHA, internal->external for field LIFNR3
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_PSTHIRD-LIFNR3
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSTHIRD-LIFNR3.
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_PSTHIRD_STR, 
CRETY TYPE STRING,
CRENR TYPE STRING,
LIFNR1 TYPE STRING,
LIFNR2 TYPE STRING,
LIFNR3 TYPE STRING,
AGCOD TYPE STRING,
LIFSG1 TYPE STRING,
LIFSG2 TYPE STRING,
LIFSG3 TYPE STRING,
RULNR TYPE STRING,
IOSCI TYPE STRING,
IOPAY TYPE STRING,
IOANM TYPE STRING,
IOAST TYPE STRING,
IOAPC TYPE STRING,
IOAPR TYPE STRING,
IOACO TYPE STRING,
IOAPH TYPE STRING,
IOPLN1 TYPE STRING,
IOPLN2 TYPE STRING,
IOPLN3 TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSTHIRD_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_PSTHIRD_STR-CRETY sy-vline 
WA_PSTHIRD_STR-CRENR sy-vline 
WA_PSTHIRD_STR-LIFNR1 sy-vline 
WA_PSTHIRD_STR-LIFNR2 sy-vline 
WA_PSTHIRD_STR-LIFNR3 sy-vline 
WA_PSTHIRD_STR-AGCOD sy-vline 
WA_PSTHIRD_STR-LIFSG1 sy-vline 
WA_PSTHIRD_STR-LIFSG2 sy-vline 
WA_PSTHIRD_STR-LIFSG3 sy-vline 
WA_PSTHIRD_STR-RULNR sy-vline 
WA_PSTHIRD_STR-IOSCI sy-vline 
WA_PSTHIRD_STR-IOPAY sy-vline 
WA_PSTHIRD_STR-IOANM sy-vline 
WA_PSTHIRD_STR-IOAST sy-vline 
WA_PSTHIRD_STR-IOAPC sy-vline 
WA_PSTHIRD_STR-IOAPR sy-vline 
WA_PSTHIRD_STR-IOACO sy-vline 
WA_PSTHIRD_STR-IOAPH sy-vline 
WA_PSTHIRD_STR-IOPLN1 sy-vline 
WA_PSTHIRD_STR-IOPLN2 sy-vline 
WA_PSTHIRD_STR-IOPLN3 sy-vline      INTO ld_text SEPARATED BY SPACE.

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