ABAP Select data from SAP table PC2_UN02 into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP PC2_UN02 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 PC2_UN02. 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 PC2_UN02 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_PC2_UN02 TYPE STANDARD TABLE OF PC2_UN02,
      WA_PC2_UN02 TYPE PC2_UN02,
      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: <PC2_UN02> TYPE PC2_UN02.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_PC2_UN02.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM PC2_UN02
  INTO TABLE IT_PC2_UN02.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PC2_UN02
*  INTO TABLE @DATA(IT_PC2_UN022).
*--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_PC2_UN02 INDEX 1 INTO DATA(WA_PC2_UN022).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_PC2_UN02 ASSIGNING <PC2_UN02>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PC2_UN02>-FCODE = 1.
<PC2_UN02>-ENDDA = 1.
<PC2_UN02>-BEGDA = 1.
<PC2_UN02>-SEQNR = 1.
<PC2_UN02>-CNTR1 = 1.

ENDLOOP.

LOOP AT IT_PC2_UN02 INTO WA_PC2_UN02.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PC2_UN02-DPERC, sy-vline,
  WA_PC2_UN02-CONAM, sy-vline,
  WA_PC2_UN02-EXCLF, sy-vline,
  WA_PC2_UN02-SUPSC, sy-vline,
  WA_PC2_UN02-SUPES, sy-vline,
  WA_PC2_UN02-EMPCN, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PC2_UN02 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_PC2_UN02 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_PC2_UN02 INTO WA_PC2_UN02.


*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.
ENDFORM. 

*&---------------------------------------------------------------------*
*& Form process_as_string_field_values
*&---------------------------------------------------------------------*
FORM process_as_string_field_values CHANGING p_EKKO LIKE wa_EKKO.

TYPES: BEGIN OF T_PC2_UN02_STR, 
FCODE TYPE STRING,
ENDDA TYPE STRING,
BEGDA TYPE STRING,
SEQNR TYPE STRING,
CNTR1 TYPE STRING,
DPERC TYPE STRING,
CONAM TYPE STRING,
EXCLF TYPE STRING,
SUPSC TYPE STRING,
SUPES TYPE STRING,
EMPCN TYPE STRING,
EMPAM TYPE STRING,
MEMNO TYPE STRING,
MESSG TYPE STRING,
SUPFR TYPE STRING,
COMFR TYPE STRING,
EMPFR TYPE STRING,
CONTR TYPE STRING,
EFFDT TYPE STRING,
BENHR TYPE STRING,
PIPEN TYPE STRING,
NOTSL TYPE STRING,
PIPHR TYPE STRING,
TAXFN TYPE STRING,
PYCTR TYPE STRING,
CS551 TYPE STRING,
CS542 TYPE STRING,
ADSAL TYPE STRING,
ADALL TYPE STRING,
ADHDA TYPE STRING,
ADPLT TYPE STRING,
INSAL TYPE STRING,
INALL TYPE STRING,
INHDA TYPE STRING,
INPLT TYPE STRING,
CONLO TYPE STRING,
WAERS TYPE STRING,
EXCHO TYPE STRING,
PSSAM TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PC2_UN02_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_PC2_UN02_STR-FCODE sy-vline 
WA_PC2_UN02_STR-ENDDA sy-vline 
WA_PC2_UN02_STR-BEGDA sy-vline 
WA_PC2_UN02_STR-SEQNR sy-vline 
WA_PC2_UN02_STR-CNTR1 sy-vline 
WA_PC2_UN02_STR-DPERC sy-vline 
WA_PC2_UN02_STR-CONAM sy-vline 
WA_PC2_UN02_STR-EXCLF sy-vline 
WA_PC2_UN02_STR-SUPSC sy-vline 
WA_PC2_UN02_STR-SUPES sy-vline 
WA_PC2_UN02_STR-EMPCN sy-vline 
WA_PC2_UN02_STR-EMPAM sy-vline 
WA_PC2_UN02_STR-MEMNO sy-vline 
WA_PC2_UN02_STR-MESSG sy-vline 
WA_PC2_UN02_STR-SUPFR sy-vline 
WA_PC2_UN02_STR-COMFR sy-vline 
WA_PC2_UN02_STR-EMPFR sy-vline 
WA_PC2_UN02_STR-CONTR sy-vline 
WA_PC2_UN02_STR-EFFDT sy-vline 
WA_PC2_UN02_STR-BENHR sy-vline 
WA_PC2_UN02_STR-PIPEN sy-vline 
WA_PC2_UN02_STR-NOTSL sy-vline 
WA_PC2_UN02_STR-PIPHR sy-vline 
WA_PC2_UN02_STR-TAXFN sy-vline 
WA_PC2_UN02_STR-PYCTR sy-vline 
WA_PC2_UN02_STR-CS551 sy-vline 
WA_PC2_UN02_STR-CS542 sy-vline 
WA_PC2_UN02_STR-ADSAL sy-vline 
WA_PC2_UN02_STR-ADALL sy-vline 
WA_PC2_UN02_STR-ADHDA sy-vline 
WA_PC2_UN02_STR-ADPLT sy-vline 
WA_PC2_UN02_STR-INSAL sy-vline 
WA_PC2_UN02_STR-INALL sy-vline 
WA_PC2_UN02_STR-INHDA sy-vline 
WA_PC2_UN02_STR-INPLT sy-vline 
WA_PC2_UN02_STR-CONLO sy-vline 
WA_PC2_UN02_STR-WAERS sy-vline 
WA_PC2_UN02_STR-EXCHO sy-vline 
WA_PC2_UN02_STR-PSSAM sy-vline      INTO ld_text SEPARATED BY SPACE.

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