Loading a XML-document into tables

Question

Hi,
I have created a view for the tables below.
Table Book with columns:
- Book_ID
- Book_Name
- Ref_To_Price ( -> is a reference to Table Price (Price_ID))
Table Price with columns:
- Price_ID
- Price_DM
SQL-Syntax:
"create view Bookprice as select Book_ID, Book_Name, Ref_To_Price, Price_ID, Price_DM from Book, Price where Ref_To_Price = Price_ID; "
XML-Document:
<?xml version="1.0" encoding="UTF-16"?>
<!DOCTYPE ANWENDUNGEN SYSTEM "file:/E:/book.dtd">
<!-- ?xml-stylesheet href="book.xsl" type="text/xsl"? -->
<ROOTDOC>
<ROW>
<BOOK_ID>66-77</BOOK_ID>
<BOOK_NAME>JavaScript</BOOK_NAME>
<REF_TO_PRICE>12</REF_TO_PRICE>
<PRICE_ID>12</PRICE_ID>
<PRICE_DM>25.50DM</PPRICE_DM>
</ROW>
</ROOTDOC>
If I use the XML SQL Utility to insert the XML-Document, the following error message came up:
" Exception in thread "main" oracle.xml.sql.OracleXMLSQLException: java.sql.SQLException: ORA-01776: cannot modify more than one base table through a join view "
Can anyone help me, please ?
null

Answer 1

Hi,
This is a classic join view problem, where u cannot update two tables in one shot. The main problem is that ur two tables are not normalized correctly. Why can't they be in just one table?
OK, if that is not possible, then the best way out is to create a simple INSTEAD OF trigger on the view which will insert correclty,
e.g.
CREATE TRIGGER bookprice_tr INSTEAD OF INSERT ON Bookprice FOR EACH ROW
BEGIN
insert into Book values (:NEW.Book_id,
:NEW.Book_name, :NEW.Ref_to_Price);
insert into Price
values(:NEW.Price_ID, :NEW.Price_DM);
END;
Hope this helps,
Murali