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In this section, we will demonstrate the steps needed to select the collection and its elements as custom class objects. Oracle does not support the method that uses type map in this scenario (it gives a ClassCastException). The only correct and supported method is to invoke the Oracle extension method getORAData(). This does not require a type map, and it requires us to perform the following steps: 1. Prepare and execute the statement that selects the collection object. 2. Use the method getORAData() of the OracleResultSet interface to obtain the collection as an object belonging to the custom class. 3. Use the method getArray() on the custom collection object to obtain the Object array, each element of which is of the custom class that represents collection member element. We will now demonstrate each of these steps as part of the definition of the method _demoSelectAsCustomCollectionClass() presented here. The method demoSelectAsCustom CollectionClass() materializes the collection as an AddressList object and its members as Address objects as follows: private static void _demoSelectAsCustomCollectionClass( Connection conn ) throws SQLException, ClassNotFoundException { PreparedStatement pstmt = null; ResultSet rset = null; try { The first step is to prepare and execute a statement that selects the nested table column emp_address_list from the table emp_table: String stmtString = "select emp_address_list from emp_table"; pstmt = conn.prepareStatement( stmtString ); rset = pstmt.executeQuery(); while( rset.next() ) { We retrieve the collection as an AddressList object by executing the getORAData() method of the OracleResultSet interface: AddressList addressList = (AddressList)((oracle.jdbc.OracleResultSet) rset).getORAData(1, AddressList.getORADataFactory());

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using (TransactionScope tx = new TransactionScope(TransactionScopeOptionRequired)) { if (i==1) { txComplete(); } } Here are some things TransactionScope does for you: Any statement appearing within the brackets of the using statement will be done within the transaction Any connection created in this block will be enlisted in the transaction If an error occurs within the using block, the transaction will be automatically rolled back The check of i==1 is basically a check of are you happy with the work If yes, then call Complete on the transaction for your portion of the work Every step of the call stack must call Complete for the transaction to be committed How is the transaction managed under the hood This depends on the database you re connecting to SQL Server 2005 supports lightweight PSPE transactions.

For example: seq { for i in numbers do if i % 2 = 0 then yield (i, i*i) } |> Seqtruncate 3 |> sortBy revOrder There are pros and cons to using sequence expression syntax for some parts of queries: Sequence expressions are very good for the subset of queries expressed using iteration (for), mapping (select/yield), and filtering (if/then/when/where) They are particularly good for queries containing multiple nested for statements Other query constructs such as ordering, truncating, grouping, and aggregating must be expressed directly using aggregate operators such as SeqorderBy and SeqgroupBy Some queries depend on the index position of an item within a stream These are best expressed directly using aggregate operators such as Seqmapi Many queries are often part of a longer series of transformations chained by |> operators.

Finally, we retrieve the entire array as an array of Address objects by executing the method getArray() of the AddressList object. We can then loop through this array to access individual elements and their attributes (we print only two attributes of the Address attributes for demonstration purpose): Address[] arrayInJava = addressList.getArray(); for( int i=0; i < arrayInJava.length; i++ ) { Address emp = arrayInJava[i]; System.out.println( emp.getLine1() ); System.out.println( emp.getState() ); } } } finally { JDBCUtil.close( rset); JDBCUtil.close( pstmt); } }

Often the type of the data being transformed at each step varies substantially through the chain of operators These queries are best expressed using aggregate operator chains..

So if this code connects to SQL Server 2005, the transaction is managed by that provider and is no more expensive than an ADONET transaction Let s contrast this block of code to similar code that does the same thing in COM+ The type defining this method does not need to inherit from ServicedComponent This assembly does not need a strong name, which it would for registration in COM+ No special registration steps are necessary to configure the component within COM+ It performs just as well as Enterprise Services if you re using SQL Server 2000, and performs as well as an ADONET transaction if you re using SQL Server 2005 With SQL Server 2005, the DTC would automatically be enlisted to manage the transaction if any layer of the call stack connected to a different database.