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The majority of queries don t benefit from result caching. This may come as a surprise. After all, it sounds like avoiding a database hit is always a good thing. There are two good reasons why this doesn t always work for arbitrary queries, compared to object navigation or retrieval by identifier. First, you must ask how often you re going to execute the same query repeatedly. Granted, you may have a few queries in your application that are executed over and over again, with exactly the same arguments bound to parameters, and the same automatically generated SQL statement. We consider this a rare case, but when you re certain a query is executed repeatedly, it becomes a good candidate for result caching. Second, for applications that perform many queries and few inserts, deletes, or updates, caching queries can improve performance and scalability. On the other hand if the application performs many writes, the query cache won t be utilized efficiently. Hibernate expires a cached query resultset when there is any insert, update, or delete of any row of a table that appeared in the cached query result. This means cached results may have a short lifetime, and even if a query is executed repeatedly, no cached result can be used due to concurrent modifications of the same data (same tables). For many queries, the benefit of the query result cache is nonexistent or, at least, doesn t have the impact you d expect. But one special kind of query can greatly benefit from result caching.

dest overwrite src <fileset> <patternset> Destination directory. [File] Should the task overwrite files in dest, even if they are newer than the corresponding entries in the archive [Boolean] Path to Zip file. [File] Adds a fileset. [Fileset] Adds a patternset. [Patternset]

Let s assume that you have an entity that has a natural key. We aren t talking about a natural primary key, but about a business key that applies to a single or compound attributes of your entity. For example, the login name of a user can be a unique business key, if it s immutable. This is the key we already isolated as perfect for the

implementation of a good equals() object equality routine. You can find examples of such keys in Implementing equality with a business key, in chapter 9, section 9.2.3. Usually, you map the attributes that form your natural key as regular properties in Hibernate. You may enable a unique constraint at the database level to represent this key. For example, if you consider the User class, you may decide that username and emailAddress form the entity s business key:

Sets the given property if the specified target has a timestamp greater than all of the source files.

<class name="User"> <id name="id".../> <property name="username" unique-key="UNQ_USERKEY"/> <property name="emailAddress" unique-key="UNQ_USERKEY"/> ... </class>

property srcfile targetfile value <mapper> <srcfiles> The property to set if the target file is more up-to-date than (each of) the source file(s). [String] The file that must be older than the target file if the property is to be set. [File] The file which must be more up-to-date than (each of) the source file(s) if the property is to be set. [File] The value to set the named property to if the target file is more up-to-date than (each of) the source files. [String] Defines source to target mapping. [Mapper] Adds fileset to the source files. [Fileset]

This mapping enables a unique key constraint at the database level that spans two columns. Let s also assume that the business key properties are immutable. This is unlikely, because you probably allow users to update their email addresses, but the functionality we re presenting now makes sense only if you re dealing with an immutable business key. You map immutability as follows:

defaultexcludes destdir excludes exportclasses exportdebuginfo exportresources Sets whether default exclusions should be used; default true. [Boolean] Destination directory into which the selected items should be exported; required. [File] Set of exclude patterns. [String] Optional flag to export the class files; default false. [Boolean] Optional flag to export the debug info; default false. [Boolean] Optional flag to export the resource file; default true. [Boolean]

<class name="User"> <id name="id".../> <property name="username" unique-key="UNQ_USERKEY" update="false"/> <property name="emailAddress" unique-key="UNQ_USERKEY" update="false"/> ... </class>

Or, to utilize cache lookups by business key, you can map it with <natural-id>:

Optional flag to export the Java files; default true. [Boolean] Set of include patterns. [String] If true, files will be overwritten during export. [Boolean] Name and port of a remote tool server. [String] Adds a name entry on the exclude list. Adds a name entry on the include list.

<class name="User"> <id name="id".../> <cache usage="read-write"/> <natural-id mutable="false"> <property name="username"/> <property name="emailAddress"/> </natural-id> ... </class>

defaultexcludes importclasses importresources importsources project remote <fileset> Sets whether default exclusions should be used. [Boolean] Flag to import .class files; optional, default false. [Boolean] Imports resource files (anything that doesn t end in .class or .java); optional, default true. [Boolean] Imports .java files; optional, default true. [Boolean] The VisualAge for Java Project name to import into. [String] Name and port of a remote tool server [String] Adds a set of files (nested fileset attribute). [Fileset]

Summary