ABAP Select data from SAP table PSFACTS_FIELD_DESCRIPTORS into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PSFACTS_FIELD_DESCRIPTORS
*  INTO TABLE @DATA(IT_PSFACTS_FIELD_DESCRIPTORS2).
*--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_PSFACTS_FIELD_DESCRIPTORS INDEX 1 INTO DATA(WA_PSFACTS_FIELD_DESCRIPTORS2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PSFACTS_FIELD_DESCRIPTORS>-XFIELD = 1.
<PSFACTS_FIELD_DESCRIPTORS>-CALENDAR_DATE = 1.
<PSFACTS_FIELD_DESCRIPTORS>-DESCRIPTION = 1.
<PSFACTS_FIELD_DESCRIPTORS>-LANGUAGE = 1.
<PSFACTS_FIELD_DESCRIPTORS>-AMOUNT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PSFACTS_FIELD_DESCRIPTORS-CURRENCY, sy-vline,
  WA_PSFACTS_FIELD_DESCRIPTORS-BU_PARTNER, sy-vline,
  WA_PSFACTS_FIELD_DESCRIPTORS-CONTRACT_PARTNER, sy-vline,
  WA_PSFACTS_FIELD_DESCRIPTORS-CONTRACT_ACCOUNT, sy-vline,
  WA_PSFACTS_FIELD_DESCRIPTORS-CONTRACT_OBJECT, sy-vline,
  WA_PSFACTS_FIELD_DESCRIPTORS-REAL_ESTATE_CONTRACT, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PSFACTS_FIELD_DESCRIPTORS 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_PSFACTS_FIELD_DESCRIPTORS 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_PSFACTS_FIELD_DESCRIPTORS INTO WA_PSFACTS_FIELD_DESCRIPTORS.


*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 ISOLA, internal->external for field LANGUAGE
CALL FUNCTION 'CONVERSION_EXIT_ISOLA_OUTPUT'
  EXPORTING
    input =                      WA_PSFACTS_FIELD_DESCRIPTORS-LANGUAGE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSFACTS_FIELD_DESCRIPTORS-LANGUAGE.
WRITE:/ 'New Value:', ld_input.

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

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

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

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

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

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_PSFACTS_FIELD_DESCRIPTORS-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PSFACTS_FIELD_DESCRIPTORS-UNIT.
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_PSFACTS_FIELD_DESCRIPTORS_STR, 
XFIELD TYPE STRING,
CALENDAR_DATE TYPE STRING,
DESCRIPTION TYPE STRING,
LANGUAGE TYPE STRING,
AMOUNT TYPE STRING,
CURRENCY TYPE STRING,
BU_PARTNER TYPE STRING,
CONTRACT_PARTNER TYPE STRING,
CONTRACT_ACCOUNT TYPE STRING,
CONTRACT_OBJECT TYPE STRING,
REAL_ESTATE_CONTRACT TYPE STRING,
RFOBJ_ID TYPE STRING,
QUANTITY TYPE STRING,
UNIT TYPE STRING,
TIME TYPE STRING,
STATUS TYPE STRING,
PERIOD TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PSFACTS_FIELD_DESCRIPTORS_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_PSFACTS_FIELD_DESCRIPTORS_STR-XFIELD sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-CALENDAR_DATE sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-DESCRIPTION sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-LANGUAGE sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-AMOUNT sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-CURRENCY sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-BU_PARTNER sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-CONTRACT_PARTNER sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-CONTRACT_ACCOUNT sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-CONTRACT_OBJECT sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-REAL_ESTATE_CONTRACT sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-RFOBJ_ID sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-QUANTITY sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-UNIT sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-TIME sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-STATUS sy-vline 
WA_PSFACTS_FIELD_DESCRIPTORS_STR-PERIOD sy-vline      INTO ld_text SEPARATED BY SPACE.

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