ABAP Select data from SAP table P02_B2A_ELM_CONTEXT_PERNR into internal table

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Below is a number of ABAP code snippets to demonstrate how to select data from SAP P02_B2A_ELM_CONTEXT_PERNR 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 P02_B2A_ELM_CONTEXT_PERNR. 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 P02_B2A_ELM_CONTEXT_PERNR 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_P02_B2A_ELM_CONTEXT_PERNR TYPE STANDARD TABLE OF P02_B2A_ELM_CONTEXT_PERNR,
      WA_P02_B2A_ELM_CONTEXT_PERNR TYPE P02_B2A_ELM_CONTEXT_PERNR,
      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: <P02_B2A_ELM_CONTEXT_PERNR> TYPE P02_B2A_ELM_CONTEXT_PERNR.

*Process all fields in table header/work area as string values
  PERFORM process_as_string_field_values CHANGING wa_P02_B2A_ELM_CONTEXT_PERNR.

SELECT *
*restrict ABAP select to first 10 rows
 UP TO 10 ROWS      
  FROM P02_B2A_ELM_CONTEXT_PERNR
  INTO TABLE IT_P02_B2A_ELM_CONTEXT_PERNR.

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM P02_B2A_ELM_CONTEXT_PERNR
*  INTO TABLE @DATA(IT_P02_B2A_ELM_CONTEXT_PERNR2).
*--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_P02_B2A_ELM_CONTEXT_PERNR INDEX 1 INTO DATA(WA_P02_B2A_ELM_CONTEXT_PERNR2).


*Demonstrate how to loop at an internal table and update values using a FIELD-SYMBOL
LOOP AT IT_P02_B2A_ELM_CONTEXT_PERNR ASSIGNING <P02_B2A_ELM_CONTEXT_PERNR>.

*To update a field value using a field symbol simply change the value via the field symbol pointer
<P02_B2A_ELM_CONTEXT_PERNR>-CMPNY = 1.
<P02_B2A_ELM_CONTEXT_PERNR>-DOCTY = 1.
<P02_B2A_ELM_CONTEXT_PERNR>-VERSN = 1.
<P02_B2A_ELM_CONTEXT_PERNR>-DYEAR = 1.
<P02_B2A_ELM_CONTEXT_PERNR>-DMNTH = 1.

ENDLOOP.

LOOP AT IT_P02_B2A_ELM_CONTEXT_PERNR INTO WA_P02_B2A_ELM_CONTEXT_PERNR.
*Write horizonal line to screen report.
  WRITE:/ sy-uline.

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_P02_B2A_ELM_CONTEXT_PERNR-DLANG, sy-vline,
  WA_P02_B2A_ELM_CONTEXT_PERNR-TCASE, sy-vline,
  WA_P02_B2A_ELM_CONTEXT_PERNR-REQID, sy-vline,
  WA_P02_B2A_ELM_CONTEXT_PERNR-MONID, sy-vline,
  WA_P02_B2A_ELM_CONTEXT_PERNR-SUBST, sy-vline,
  WA_P02_B2A_ELM_CONTEXT_PERNR-SUBID, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_P02_B2A_ELM_CONTEXT_PERNR 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_P02_B2A_ELM_CONTEXT_PERNR 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_P02_B2A_ELM_CONTEXT_PERNR INTO WA_P02_B2A_ELM_CONTEXT_PERNR.


*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 GJAHR, internal->external for field DYEAR
CALL FUNCTION 'CONVERSION_EXIT_GJAHR_OUTPUT'
  EXPORTING
    input =                      WA_P02_B2A_ELM_CONTEXT_PERNR-DYEAR
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_P02_B2A_ELM_CONTEXT_PERNR-DYEAR.
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_P02_B2A_ELM_CONTEXT_PERNR_STR, 
CMPNY TYPE STRING,
DOCTY TYPE STRING,
VERSN TYPE STRING,
DYEAR TYPE STRING,
DMNTH TYPE STRING,
DLANG TYPE STRING,
TCASE TYPE STRING,
REQID TYPE STRING,
MONID TYPE STRING,
SUBST TYPE STRING,
SUBID TYPE STRING,
VARTX TYPE STRING,
SRSID TYPE STRING,
CPNAM TYPE STRING,
CPMAL TYPE STRING,
CPPHO TYPE STRING,
DECID TYPE STRING,
AWSCH TYPE STRING,
ABREH TYPE STRING,
PERNR TYPE STRING,END OF T_EKKO_STR.
DATA: WA_P02_B2A_ELM_CONTEXT_PERNR_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_P02_B2A_ELM_CONTEXT_PERNR_STR-CMPNY sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-DOCTY sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-VERSN sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-DYEAR sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-DMNTH sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-DLANG sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-TCASE sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-REQID sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-MONID sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-SUBST sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-SUBID sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-VARTX sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-SRSID sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-CPNAM sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-CPMAL sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-CPPHO sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-DECID sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-AWSCH sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-ABREH sy-vline 
WA_P02_B2A_ELM_CONTEXT_PERNR_STR-PERNR sy-vline      INTO ld_text SEPARATED BY SPACE.

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