ABAP Select data from SAP table PCHANGEHISTORY into internal table

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

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

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

*Select data and declare internal table using in-line method @DATA
*SELECT *
*  FROM PCHANGEHISTORY
*  INTO TABLE @DATA(IT_PCHANGEHISTORY2).
*--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_PCHANGEHISTORY INDEX 1 INTO DATA(WA_PCHANGEHISTORY2).


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

*To update a field value using a field symbol simply change the value via the field symbol pointer
<PCHANGEHISTORY>-MANDT = 1.
<PCHANGEHISTORY>-BILLOFMATERIAL = 1.
<PCHANGEHISTORY>-BILLOFMATERIALCATEGORY = 1.
<PCHANGEHISTORY>-BILLOFMATERIALVARIANT = 1.
<PCHANGEHISTORY>-ENGINEERINGCHANGEDOCUMENT = 1.

ENDLOOP.

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

*Write selected data to screen/report before conversion.
  WRITE:/ sy-vline,   WA_PCHANGEHISTORY-BILLOFMATERIALVARIANTUSAGE, sy-vline,
  WA_PCHANGEHISTORY-BILLOFMATERIALITEMNODENUMBER, sy-vline,
  WA_PCHANGEHISTORY-PLANT, sy-vline,
  WA_PCHANGEHISTORY-MATERIAL, sy-vline,
  WA_PCHANGEHISTORY-BILLOFMATERIALITEMCATEGORY, sy-vline,
  WA_PCHANGEHISTORY-BILLOFMATERIALITEMNUMBER, sy-vline.
ENDLOOP.
   
*Add any further fields from structure WA_PCHANGEHISTORY 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_PCHANGEHISTORY 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_PCHANGEHISTORY INTO WA_PCHANGEHISTORY.


*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 NUMCV, internal->external for field BILLOFMATERIAL
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PCHANGEHISTORY-BILLOFMATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCHANGEHISTORY-BILLOFMATERIAL.
WRITE:/ 'New Value:', ld_input.

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

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

*Conversion exit MATN1, internal->external for field MATERIAL
CALL FUNCTION 'CONVERSION_EXIT_MATN1_OUTPUT'
  EXPORTING
    input =                      WA_PCHANGEHISTORY-MATERIAL
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCHANGEHISTORY-MATERIAL.
WRITE:/ 'New Value:', ld_input.

*Conversion exit NUMCV, internal->external for field BILLOFMATERIALITEMNUMBER
CALL FUNCTION 'CONVERSION_EXIT_NUMCV_OUTPUT'
  EXPORTING
    input =                      WA_PCHANGEHISTORY-BILLOFMATERIALITEMNUMBER
  IMPORTING
    output =                     ld_input.
WRITE:/ 'Org Value:', WA_PCHANGEHISTORY-BILLOFMATERIALITEMNUMBER.
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_PCHANGEHISTORY_STR, 
MANDT TYPE STRING,
BILLOFMATERIAL TYPE STRING,
BILLOFMATERIALCATEGORY TYPE STRING,
BILLOFMATERIALVARIANT TYPE STRING,
ENGINEERINGCHANGEDOCUMENT TYPE STRING,
BILLOFMATERIALVARIANTUSAGE TYPE STRING,
BILLOFMATERIALITEMNODENUMBER TYPE STRING,
PLANT TYPE STRING,
MATERIAL TYPE STRING,
BILLOFMATERIALITEMCATEGORY TYPE STRING,
BILLOFMATERIALITEMNUMBER TYPE STRING,
DATABASETABLEFIELDNAME TYPE STRING,
ABAPDATAELEMENTDESCRIPTION TYPE STRING,
DATABASETABLE TYPE STRING,
CHANGEDOCUMENTCHANGETYPE TYPE STRING,
CHANGEDOCUMENTNEWFIELDVALUE TYPE STRING,
CHANGEDOCUMENTOLDFIELDVALUE TYPE STRING,
CHANGEDOCUMENTNEWUNIT TYPE STRING,
CHANGEDOCUMENTOLDUNIT TYPE STRING,
CHANGENUMBERCREATIONDATE TYPE STRING,
CHANGENUMBERCREATEDBYUSER TYPE STRING,
CHANGEHISTORYDESCRIPTION TYPE STRING,END OF T_EKKO_STR.
DATA: WA_PCHANGEHISTORY_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_PCHANGEHISTORY_STR-MANDT sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIAL sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIALCATEGORY sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIALVARIANT sy-vline 
WA_PCHANGEHISTORY_STR-ENGINEERINGCHANGEDOCUMENT sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIALVARIANTUSAGE sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIALITEMNODENUMBER sy-vline 
WA_PCHANGEHISTORY_STR-PLANT sy-vline 
WA_PCHANGEHISTORY_STR-MATERIAL sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIALITEMCATEGORY sy-vline 
WA_PCHANGEHISTORY_STR-BILLOFMATERIALITEMNUMBER sy-vline 
WA_PCHANGEHISTORY_STR-DATABASETABLEFIELDNAME sy-vline 
WA_PCHANGEHISTORY_STR-ABAPDATAELEMENTDESCRIPTION sy-vline 
WA_PCHANGEHISTORY_STR-DATABASETABLE sy-vline 
WA_PCHANGEHISTORY_STR-CHANGEDOCUMENTCHANGETYPE sy-vline 
WA_PCHANGEHISTORY_STR-CHANGEDOCUMENTNEWFIELDVALUE sy-vline 
WA_PCHANGEHISTORY_STR-CHANGEDOCUMENTOLDFIELDVALUE sy-vline 
WA_PCHANGEHISTORY_STR-CHANGEDOCUMENTNEWUNIT sy-vline 
WA_PCHANGEHISTORY_STR-CHANGEDOCUMENTOLDUNIT sy-vline 
WA_PCHANGEHISTORY_STR-CHANGENUMBERCREATIONDATE sy-vline 
WA_PCHANGEHISTORY_STR-CHANGENUMBERCREATEDBYUSER sy-vline 
WA_PCHANGEHISTORY_STR-CHANGEHISTORYDESCRIPTION sy-vline      INTO ld_text SEPARATED BY SPACE.

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