ABAP Select data from SAP table /ISDFPS/ST_REL_LFB_PO into internal table

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

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

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM /ISDFPS/ST_REL_LFB_PO
  INTO TABLE IT_/ISDFPS/ST_REL_LFB_PO.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /ISDFPS/ST_REL_LFB_PO
*  INTO TABLE @DATA(IT_/ISDFPS/ST_REL_LFB_PO2).
*--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_/ISDFPS/ST_REL_LFB_PO INDEX 1 INTO DATA(WA_/ISDFPS/ST_REL_LFB_PO2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</ISDFPS/ST_REL_LFB_PO>-MEINS = 1.
</ISDFPS/ST_REL_LFB_PO>-BSTMG = 1.
</ISDFPS/ST_REL_LFB_PO>-EINDT = 1.
</ISDFPS/ST_REL_LFB_PO>-NTGEW = 1.
</ISDFPS/ST_REL_LFB_PO>-GEWEI = 1.

ENDLOOP.

LOOP AT IT_/ISDFPS/ST_REL_LFB_PO INTO WA_/ISDFPS/ST_REL_LFB_PO.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/ISDFPS/ST_REL_LFB_PO-BRGEW, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_PO-BSART, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_PO-LFART, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_PO-VOLUM, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_PO-VOLEH, sy-vline,
  WA_/ISDFPS/ST_REL_LFB_PO-EKORG, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/ISDFPS/ST_REL_LFB_PO 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_/ISDFPS/ST_REL_LFB_PO 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_/ISDFPS/ST_REL_LFB_PO INTO WA_/ISDFPS/ST_REL_LFB_PO.


*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 CUNIT, internal->external for field MEINS
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_PO-MEINS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_PO-MEINS.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit ABPSP, internal->external for field PSPNR
CALL FUNCTION 'CONVERSION_EXIT_ABPSP_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_PO-PSPNR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_PO-PSPNR.
WRITE:/ 'New Value:', ld_input.

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

*Conversion exit ALPHA, internal->external for field PREQ_NO
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/ISDFPS/ST_REL_LFB_PO-PREQ_NO
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/ISDFPS/ST_REL_LFB_PO-PREQ_NO.
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_/ISDFPS/ST_REL_LFB_PO_STR, 
MEINS TYPE STRING,
BSTMG TYPE STRING,
EINDT TYPE STRING,
NTGEW TYPE STRING,
GEWEI TYPE STRING,
BRGEW TYPE STRING,
BSART TYPE STRING,
LFART TYPE STRING,
VOLUM TYPE STRING,
VOLEH TYPE STRING,
EKORG TYPE STRING,
EKGRP TYPE STRING,
PSPNR TYPE STRING,
KUNNR TYPE STRING,
VKORG TYPE STRING,
VTWEG TYPE STRING,
SPART TYPE STRING,
VSTEL TYPE STRING,
VSBED TYPE STRING,
FLAG_EV TYPE STRING,
PREQ_NO TYPE STRING,
PREQ_ITEM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/ISDFPS/ST_REL_LFB_PO_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_/ISDFPS/ST_REL_LFB_PO_STR-MEINS sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-BSTMG sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-EINDT sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-NTGEW sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-GEWEI sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-BRGEW sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-BSART sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-LFART sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-VOLUM sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-VOLEH sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-EKORG sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-EKGRP sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-PSPNR sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-KUNNR sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-VKORG sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-VTWEG sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-SPART sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-VSTEL sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-VSBED sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-FLAG_EV sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-PREQ_NO sy-vline 
WA_/ISDFPS/ST_REL_LFB_PO_STR-PREQ_ITEM sy-vline      INTO ld_text SEPARATED BY SPACE.

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