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Understanding isolation levels Databases (and other transactional systems) attempt to ensure transaction isolation, meaning that, from the point of view of each concurrent transaction, it appears no other transactions are in progress. Traditionally, this has been implemented using locking. A transaction may place a lock on a particular item of data, temporarily preventing access to that item by other transactions. Some modern databases such as Oracle and PostgreSQL implement transaction isolation using multiversion concurrency control, which is generally considered more scalable. We discuss isolation assuming a locking model (most of our observations are also applicable to multiversion concurrency). This discussion is about database transactions and the isolation level provided by the database. NHibernate doesn t add additional semantics; it uses whatever is available with a given database. If you consider the many years of experience that database vendors have had with implementing concurrency control, you ll clearly see the advantage of this approach. Your part, as a NHibernate application developer, is to understand the capabilities of your database and how to change the database isolation behavior if required by your particular scenario (and by your data-integrity requirements).

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First, let s look at several phenomena that break full transaction isolation. The ANSI SQL standard defines the standard transaction isolation levels in terms of which of these phenomena are permissible: Lost update Two transactions both update a row, and then the second transaction aborts, causing both changes to be lost. This occurs in systems that don t implement any locking. The concurrent transactions aren t isolated. Dirty read One transaction reads changes made by another transaction that hasn t yet been committed. This is dangerous, because those changes may later be rolled back.

Your screen looks like this:

We ve already discussed the role of the where clause in expressing restriction. Often, you ll need to apply restriction criteria to multiple associated classes (joined tables). If you want to do this using an HQL from clause join, you need to assign an alias to the joined class:

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This query assigns the alias item to the class Item and the alias bid to the joined Item s bids. You then use both aliases to express your restriction criteria in the where clause. The resulting SQL is as follows:

select I.DESCRIPTION, I.CREATED, I.SUCCESSFUL_BID, B.BID_ID, B.AMOUNT, B.ITEM_ID, B.CREATED from ITEM I inner join BID B on I.ITEM_ID = B.ITEM_ID where I.DESCRIPTION like '%part%' and B.AMOUNT > 100

14. Collapse the #Region <;$QD> Windows Form Designer Generated Code <;$QS> section of the page. 15. Copy the contents of the FindItemsButtonVB.txt file in the C:\Documents and Settings\<username>\My Documents\Microsoft Press\rs2005sbs\chap17 folder and paste into the code page within the Button1Click subroutine. The code looks like this:

The query returns all combinations of associated Bids and Items. But unlike a fetch join, the Bids collection of the Item isn t initialized by the query! What do we mean by a combination here We mean an ordered pair: (bid, item). In the query result, NHibernate represents an ordered pair as an array. Let s discuss a full code example with the result of such a query:

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IQuery q = session.CreateQuery("from Item item join item.Bids bid"); foreach( object[] pair in q.List() ) { Item item = (Item) pair[0]; Bid bid = (Bid) pair[1]; }

Instead of an IList of Items, this query returns an IList of object[] arrays. At index 0 is the Item, and at index 1 is the Bid. A particular Item may appear multiple times, once for each associated Bid. This is all different from the case of a query with an eager fetch join. The query with the fetch join returned an IList of Items, with initialized Bids collections. If you don t want the Bids in the query result, you can specify a select clause in HQL. This clause is optional (it isn t optional in SQL), so you only have to use it when you aren t satisfied with the result returned by default. You use the alias in a select clause to retrieve only the selected objects:

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