ABAP Select data from SAP table /PM0/3FR_FIELD into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP /PM0/3FR_FIELD 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 /PM0/3FR_FIELD. 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 /PM0/3FR_FIELD 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_/PM0/3FR_FIELD TYPE STANDARD TABLE OF /PM0/3FR_FIELD,
      WA_/PM0/3FR_FIELD TYPE /PM0/3FR_FIELD,
      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: </PM0/3FR_FIELD> TYPE /PM0/3FR_FIELD.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_/PM0/3FR_FIELD.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /PM0/3FR_FIELD
  INTO TABLE IT_/PM0/3FR_FIELD.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /PM0/3FR_FIELD
*  INTO TABLE @DATA(IT_/PM0/3FR_FIELD2).
*--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_/PM0/3FR_FIELD INDEX 1 INTO DATA(WA_/PM0/3FR_FIELD2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_/PM0/3FR_FIELD ASSIGNING </PM0/3FR_FIELD>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
</PM0/3FR_FIELD>-EXTFIELDNAME = 1.
</PM0/3FR_FIELD>-APPLTYPE = 1.
</PM0/3FR_FIELD>-DATATYPE = 1.
</PM0/3FR_FIELD>-LENG = 1.
</PM0/3FR_FIELD>-DECIMALS = 1.

ENDLOOP.

LOOP AT IT_/PM0/3FR_FIELD INTO WA_/PM0/3FR_FIELD.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/PM0/3FR_FIELD-OUTPUTLEN, sy-vline,
  WA_/PM0/3FR_FIELD-CONVEXIT, sy-vline,
  WA_/PM0/3FR_FIELD-SIGNFLAG, sy-vline,
  WA_/PM0/3FR_FIELD-LOWERCASE, sy-vline,
  WA_/PM0/3FR_FIELD-DOMA_GENFLAG, sy-vline,
  WA_/PM0/3FR_FIELD-SCRLEN1, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/PM0/3FR_FIELD 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_/PM0/3FR_FIELD 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_/PM0/3FR_FIELD INTO WA_/PM0/3FR_FIELD.


*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 DTYPE, internal->external for field DATATYPE
CALL FUNCTION 'CONVERSION_EXIT_DTYPE_OUTPUT'
  EXPORTING
    input =                      WA_/PM0/3FR_FIELD-DATATYPE
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/PM0/3FR_FIELD-DATATYPE.
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_/PM0/3FR_FIELD_STR, 
EXTFIELDNAME TYPE STRING,
APPLTYPE TYPE STRING,
DATATYPE TYPE STRING,
LENG TYPE STRING,
DECIMALS TYPE STRING,
OUTPUTLEN TYPE STRING,
CONVEXIT TYPE STRING,
SIGNFLAG TYPE STRING,
LOWERCASE TYPE STRING,
DOMA_GENFLAG TYPE STRING,
SCRLEN1 TYPE STRING,
SCRLEN2 TYPE STRING,
SCRLEN3 TYPE STRING,
HEADLEN TYPE STRING,
DTEL_GENFLAG TYPE STRING,
MANDDEFAULT TYPE STRING,
REFFIELD TYPE STRING,
REFTABLE TYPE STRING,
DOMNAME TYPE STRING,
ROLLNAME TYPE STRING,
CHECKTABLE TYPE STRING,
ENTITYTAB TYPE STRING,
SHLPFIELD TYPE STRING,
SHLPNAME TYPE STRING,
MEMORYID TYPE STRING,
DEFFDNAME TYPE STRING,
LOGFLAG TYPE STRING,
USE_IN_SET TYPE STRING,
AENAM TYPE STRING,
AEDAT TYPE STRING,
AEZET TYPE STRING,
ERNAM TYPE STRING,
ERDAT TYPE STRING,
ERZET TYPE STRING,
AEZONLO TYPE STRING,
ERZONLO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/PM0/3FR_FIELD_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_/PM0/3FR_FIELD_STR-EXTFIELDNAME sy-vline 
WA_/PM0/3FR_FIELD_STR-APPLTYPE sy-vline 
WA_/PM0/3FR_FIELD_STR-DATATYPE sy-vline 
WA_/PM0/3FR_FIELD_STR-LENG sy-vline 
WA_/PM0/3FR_FIELD_STR-DECIMALS sy-vline 
WA_/PM0/3FR_FIELD_STR-OUTPUTLEN sy-vline 
WA_/PM0/3FR_FIELD_STR-CONVEXIT sy-vline 
WA_/PM0/3FR_FIELD_STR-SIGNFLAG sy-vline 
WA_/PM0/3FR_FIELD_STR-LOWERCASE sy-vline 
WA_/PM0/3FR_FIELD_STR-DOMA_GENFLAG sy-vline 
WA_/PM0/3FR_FIELD_STR-SCRLEN1 sy-vline 
WA_/PM0/3FR_FIELD_STR-SCRLEN2 sy-vline 
WA_/PM0/3FR_FIELD_STR-SCRLEN3 sy-vline 
WA_/PM0/3FR_FIELD_STR-HEADLEN sy-vline 
WA_/PM0/3FR_FIELD_STR-DTEL_GENFLAG sy-vline 
WA_/PM0/3FR_FIELD_STR-MANDDEFAULT sy-vline 
WA_/PM0/3FR_FIELD_STR-REFFIELD sy-vline 
WA_/PM0/3FR_FIELD_STR-REFTABLE sy-vline 
WA_/PM0/3FR_FIELD_STR-DOMNAME sy-vline 
WA_/PM0/3FR_FIELD_STR-ROLLNAME sy-vline 
WA_/PM0/3FR_FIELD_STR-CHECKTABLE sy-vline 
WA_/PM0/3FR_FIELD_STR-ENTITYTAB sy-vline 
WA_/PM0/3FR_FIELD_STR-SHLPFIELD sy-vline 
WA_/PM0/3FR_FIELD_STR-SHLPNAME sy-vline 
WA_/PM0/3FR_FIELD_STR-MEMORYID sy-vline 
WA_/PM0/3FR_FIELD_STR-DEFFDNAME sy-vline 
WA_/PM0/3FR_FIELD_STR-LOGFLAG sy-vline 
WA_/PM0/3FR_FIELD_STR-USE_IN_SET sy-vline 
WA_/PM0/3FR_FIELD_STR-AENAM sy-vline 
WA_/PM0/3FR_FIELD_STR-AEDAT sy-vline 
WA_/PM0/3FR_FIELD_STR-AEZET sy-vline 
WA_/PM0/3FR_FIELD_STR-ERNAM sy-vline 
WA_/PM0/3FR_FIELD_STR-ERDAT sy-vline 
WA_/PM0/3FR_FIELD_STR-ERZET sy-vline 
WA_/PM0/3FR_FIELD_STR-AEZONLO sy-vline 
WA_/PM0/3FR_FIELD_STR-ERZONLO sy-vline      INTO ld_text SEPARATED BY SPACE.

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