ABAP Select data from SAP table /INCMD/PRINC_LI into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM /INCMD/PRINC_LI
*  INTO TABLE @DATA(IT_/INCMD/PRINC_LI2).
*--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_/INCMD/PRINC_LI INDEX 1 INTO DATA(WA_/INCMD/PRINC_LI2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
</INCMD/PRINC_LI>-MANDT = 1.
</INCMD/PRINC_LI>-PRGUID = 1.
</INCMD/PRINC_LI>-PRCNT = 1.
</INCMD/PRINC_LI>-OTYPE1 = 1.
</INCMD/PRINC_LI>-GUID1 = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_/INCMD/PRINC_LI-APPLOBJ_TYPE1, sy-vline,
  WA_/INCMD/PRINC_LI-OTYPE2, sy-vline,
  WA_/INCMD/PRINC_LI-GUID2, sy-vline,
  WA_/INCMD/PRINC_LI-APPLOBJ_TYPE2, sy-vline,
  WA_/INCMD/PRINC_LI-PRTYPE, sy-vline,
  WA_/INCMD/PRINC_LI-APPLREL_TYPE, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_/INCMD/PRINC_LI 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_/INCMD/PRINC_LI 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_/INCMD/PRINC_LI INTO WA_/INCMD/PRINC_LI.


*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 LOGSYS
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_OUTPUT'
  EXPORTING
    input =                      WA_/INCMD/PRINC_LI-LOGSYS
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/INCMD/PRINC_LI-LOGSYS.
WRITE:/ 'New Value:', ld_input.

*Conversion exit CUNIT, internal->external for field UNIT
CALL FUNCTION 'CONVERSION_EXIT_CUNIT_OUTPUT'
  EXPORTING
    input =                      WA_/INCMD/PRINC_LI-UNIT
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_/INCMD/PRINC_LI-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_/INCMD/PRINC_LI_STR, 
MANDT TYPE STRING,
PRGUID TYPE STRING,
PRCNT TYPE STRING,
OTYPE1 TYPE STRING,
GUID1 TYPE STRING,
APPLOBJ_TYPE1 TYPE STRING,
OTYPE2 TYPE STRING,
GUID2 TYPE STRING,
APPLOBJ_TYPE2 TYPE STRING,
PRTYPE TYPE STRING,
APPLREL_TYPE TYPE STRING,
HISTFLG TYPE STRING,
CREADAT TYPE STRING,
CREABY TYPE STRING,
CHNGDAT TYPE STRING,
CHNGBY TYPE STRING,
LOGSYS TYPE STRING,
PNGUID TYPE STRING,
VALIDFR TYPE STRING,
RELTYPE TYPE STRING,
RESCODE TYPE STRING,
USEUPFLG TYPE STRING,
USEUPDATE TYPE STRING,
USEUPQTY TYPE STRING,
UNIT TYPE STRING,
DENQUANT TYPE STRING,
NUMQUANT TYPE STRING,
FREETEXT TYPE STRING,
EXHAUSTDT TYPE STRING,
BACKCASTDT TYPE STRING,
EXHWRNDT TYPE STRING,
RULEPROF TYPE STRING,
PRIOFACT TYPE STRING,
DMNDPCNT TYPE STRING,
REALIGNSTDT TYPE STRING,
PREVALIDFR TYPE STRING,
TIMEFR TYPE STRING,
TIMETO TYPE STRING,
ACTIVITY TYPE STRING,
SUCCPDTRECEIPTDT TYPE STRING,
FINALDT TYPE STRING,
ICOST TYPE STRING,
FCOST TYPE STRING,
REPTYPE TYPE STRING,
REPCNTR TYPE STRING,
SNO TYPE STRING,END OF T_EKKO_STR.
DATA: WA_/INCMD/PRINC_LI_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_/INCMD/PRINC_LI_STR-MANDT sy-vline 
WA_/INCMD/PRINC_LI_STR-PRGUID sy-vline 
WA_/INCMD/PRINC_LI_STR-PRCNT sy-vline 
WA_/INCMD/PRINC_LI_STR-OTYPE1 sy-vline 
WA_/INCMD/PRINC_LI_STR-GUID1 sy-vline 
WA_/INCMD/PRINC_LI_STR-APPLOBJ_TYPE1 sy-vline 
WA_/INCMD/PRINC_LI_STR-OTYPE2 sy-vline 
WA_/INCMD/PRINC_LI_STR-GUID2 sy-vline 
WA_/INCMD/PRINC_LI_STR-APPLOBJ_TYPE2 sy-vline 
WA_/INCMD/PRINC_LI_STR-PRTYPE sy-vline 
WA_/INCMD/PRINC_LI_STR-APPLREL_TYPE sy-vline 
WA_/INCMD/PRINC_LI_STR-HISTFLG sy-vline 
WA_/INCMD/PRINC_LI_STR-CREADAT sy-vline 
WA_/INCMD/PRINC_LI_STR-CREABY sy-vline 
WA_/INCMD/PRINC_LI_STR-CHNGDAT sy-vline 
WA_/INCMD/PRINC_LI_STR-CHNGBY sy-vline 
WA_/INCMD/PRINC_LI_STR-LOGSYS sy-vline 
WA_/INCMD/PRINC_LI_STR-PNGUID sy-vline 
WA_/INCMD/PRINC_LI_STR-VALIDFR sy-vline 
WA_/INCMD/PRINC_LI_STR-RELTYPE sy-vline 
WA_/INCMD/PRINC_LI_STR-RESCODE sy-vline 
WA_/INCMD/PRINC_LI_STR-USEUPFLG sy-vline 
WA_/INCMD/PRINC_LI_STR-USEUPDATE sy-vline 
WA_/INCMD/PRINC_LI_STR-USEUPQTY sy-vline 
WA_/INCMD/PRINC_LI_STR-UNIT sy-vline 
WA_/INCMD/PRINC_LI_STR-DENQUANT sy-vline 
WA_/INCMD/PRINC_LI_STR-NUMQUANT sy-vline 
WA_/INCMD/PRINC_LI_STR-FREETEXT sy-vline 
WA_/INCMD/PRINC_LI_STR-EXHAUSTDT sy-vline 
WA_/INCMD/PRINC_LI_STR-BACKCASTDT sy-vline 
WA_/INCMD/PRINC_LI_STR-EXHWRNDT sy-vline 
WA_/INCMD/PRINC_LI_STR-RULEPROF sy-vline 
WA_/INCMD/PRINC_LI_STR-PRIOFACT sy-vline 
WA_/INCMD/PRINC_LI_STR-DMNDPCNT sy-vline 
WA_/INCMD/PRINC_LI_STR-REALIGNSTDT sy-vline 
WA_/INCMD/PRINC_LI_STR-PREVALIDFR sy-vline 
WA_/INCMD/PRINC_LI_STR-TIMEFR sy-vline 
WA_/INCMD/PRINC_LI_STR-TIMETO sy-vline 
WA_/INCMD/PRINC_LI_STR-ACTIVITY sy-vline 
WA_/INCMD/PRINC_LI_STR-SUCCPDTRECEIPTDT sy-vline 
WA_/INCMD/PRINC_LI_STR-FINALDT sy-vline 
WA_/INCMD/PRINC_LI_STR-ICOST sy-vline 
WA_/INCMD/PRINC_LI_STR-FCOST sy-vline 
WA_/INCMD/PRINC_LI_STR-REPTYPE sy-vline 
WA_/INCMD/PRINC_LI_STR-REPCNTR sy-vline 
WA_/INCMD/PRINC_LI_STR-SNO sy-vline      INTO ld_text SEPARATED BY SPACE.

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