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Persistence providers typically include a vendor-specific extension that can be used while executing a query. Such extensions are usually performance optimizations and are passed as query hints. A query hint is a tip that is used by the persistence provider while executing queries or retrieving entities. For example, a hint can be a directive to the persistence provider whether to use a cache while executing a query. You can provide a hint for a query by using the Query.setHint method. Unfortunately, the hints are implementation specific. If you want to set the timeout for a query to 10 seconds when using Oracle TopLink, you do so with

Grouping parameters introduces some so-called syntactic sugar into aspect-configuration files. The syntax for grouping parameters is as follows: group <value> { <method> [ <parameter> ... ] ; ... } When a group is used, the given value is added as the first parameter for every call that is specified between the curly brackets. Grouping parameters can be used to avoid redundancies especially in cases that use the same value for several successive calls. The following configuration file, named presentation2.acc, is equivalent to presentation.acc: group Customer { setAttributesOrder { lastName, firstName, phone, email }; setCategory { lastName, firstName } main; } display ; Strictly speaking, group is not a keyword; it is an identifier that you can freely choose. Any identifier that is not a method name and that is defined in the aspect can be chosen for defining a group. Definitions that use the grouping mechanism can be nested. For example, the aspectconfiguration file group Customer { attribute lastName { setCategory General ; } } is equivalent to setCategory Customer lastName General ; Definitions that use the grouping mechanism can be factored. For example, the aspectconfiguration file group Customer,Employee { setAttributesOrder { lastName, firstName, phone, email }; } is equivalent to

query.setHint("toplink.jdbc.timeout", new Integer(10000));

In most cases, capturing logging events is not the hardest task. Rather, it is the presentation of the message store in a meaningful and easy-to-interpret format that is more difficult. Log messages exist to enable us to analyze the behavior and lifecycle of applications. Creating a log file in HTML format is a quick and easy way of presenting log messages to a user.

query.setHint("org.hibernate.timeout", new Integer(10));

Notice the difference in how the timeout of 10 seconds is specified for each provider Be sure to verify the format for the provider you are using by checking the documentation provided by the vendor. Look for hints that may be supported by the container. Table 10.5 lists some commonly used hints for two of the leading JPA providers.

setAttributesOrder Customer { lastName, firstName, phone, email }; setAttributesOrder Employee { lastName, firstName, phone, email

To create a web browser view for your log files, use the log4j HTML layout class with the rolling file appender. The following properties are a sample of a log4j properties configuration file that assigns a file appender with an HTML layout to a logger:

Table 10.5 You can use the setHint method of the Query interface to specify query hints to the persistence provider. Common query hints are supported by two popular ORM frameworks. TopLink toplink.jdbc.fetch-size Hibernate org.hibernate.fetchSize Purpose Specifies the number of rows fetched by the JDBC driver Specifies how to use the cache Specifies whether the cache should be refreshed from the database Specifies the query timeout

If you are using named queries, then you can optionally specify the vendorspecific hints using the hints element of @NamedQuery. This element is specified as a name-value pair using the @QueryHint annotation:

log4j.logger.mylogger=DEBUG, htmlFileAppender log4j.appender.htmlFileAppender =org.apache.log4j.RollingFileAppender log4j.appender.htmlFileAppender.File=Log.html log4j.appender.htmlFileAppender.MaxFileSize=100KB log4j.appender.htmlFileAppender.MaxBackupIndex=2 log4j.appender.htmlFileAppender.layout=org.apache.log4j.HTMLLayout log4j.appender.htmlFileAppender.layout.LocationInfo=true

@NamedQuery( name = "findUserWithNoItems", query = "SELECT DISTINCT u FROM User u WHERE u.items is EMPTY", hints = { @QueryHint(name = "org.hibernate.timeout", value = "10") } )