ASP.NET Web PDF Document Viewer/Editor Control Library

NET Framework is to make creating these resource managers much easier for any type of resource you want to participate in a transaction The problem with COM+ transactions is that they rely on the Distributed Transaction Coordinator (DTC), which is a feature-rich transactional engine, but those features come at a price The DTC consumes a lot of resources and can introduce a performance penalty to your application This is fine when transactional work occurs across relational database systems, but it can be a large price to pay if the transaction is isolated to a single database For a single database, you re better off using T-SQL Transactions, or ADONET connection-based transactions Another benefit of the transactional system in COM+ is the capability to dynamically compose transactions An atomic method can be declared as requiring a transaction context Sometimes you call that method on its own, where an ADO.

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That concludes our section on retrieving collection of built-in types as ARRAY objects. In the next section, we look at how we can access and manipulate a collection of object types.

In the previous section, our collection elements were built-in types such as varchar2 or number. In this section we will deal with collections whose elements are structured types (in our case, Oracle object types). Most of the topics covered in the previous section also apply to a collection of Oracle object types; the only difference is in how the member objects materialize in Java as objects. We ll begin by creating schema elements on which our examples will work. We ll then demonstrate how to access a collection of Oracle objects as a weakly typed STRUCT object. Finally, we ll examine how, with the help of JPublisher, we can materialize these collections as objects of strongly typed custom classes.

One simple use of this task is to run it and print the results when the operation completes: Async.Run (async { let! (maxF,maxC,lat,lon) = getWeather("Los Angeles","CA","USA") do printfn "Temperature: %sF/%sC" maxF maxC do printfn "Lat/Lon: %f/%f" lat lon }) With an active web connection, this results in output such as the following (after a short delay while the connections are resolved): Temperature: 100F/38C Lat/Lon: 33.833000/-118.217003

NET transaction would completely suffice Sometimes, however, you call that method as a step of a larger transaction, one in which you may need the distributed services of the DTC Ideally the transaction would use the less-expensive resource manager of ADONET, and the transaction context would recognize when the services of a more robust resource manager such as the DTC were needed, and then automatically promote the transaction and enlist the more resource intensive manager This automatic transaction promotion is the second big design goal of transactions in NET 20..

Our first step is to create a new schema consisting of a collection of object types. This time we ll use nested tables as part of our schema instead of varrays. The first step is to create an object type, address, that stores a postal address in the United States. benchmark@ORA10G> create or replace type address as object 2 ( 3 line1 varchar2(50), 4 line2 varchar2(50), 5 street varchar2(50), 6 city varchar2(30), 7 state varchar2(2), 8 zip varchar2(10) 9 ) 10 / Type created. Next, we create a nested table, nested_table_of_addresses, of address objects: benchmark@ORA10G> create or replace type nested_table_of_addresses as table of address; 2 / Type created.

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