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namespace in the statement attribute. The full namespace notation is required
even if the statement attribute is referencing a mapped statement within the con-
fines of the same sqlMap configuration. When specifying mapped statements that
exist in another sqlMap configuration, you must also make sure that the depen-
dent sqlMap s have been loaded prior to the statement attribute referencing it.
The other flush tag used to manage the contents of the cache is <flushinterval> .
The <flushInterval> tag is a bit simpler than <flushOnExecute> since it does not
have any configuration dependencies other than time itself. The <flushInterval>
tag will flush the cache on a recurring interval. This interval is started at the time
the cache is created during the configuration loading and continues until the
application is shut down. The <flushInterval> tag allows you to specify hours,
minutes, seconds, or milliseconds, as shown in table 9.5.
Table 9.5
<flushInterval> tag attributes
The number of hours that should pass before the cache is flushed
The number of minutes that should pass before the cache is flushed
The number of seconds that should pass before the cache is flushed
The number of milliseconds that should pass before the cache is flushed
To remove any potential confusion, <flushInterval> does not allow you to specify
particular times to flush the cache. It is purely interval based. Listing 9.3 shows an
example that uses the <flushInterval> tag to limit the lifespan of cached objects
to 12 hours.
Listing 9.3
<flushInterval> caching example
<sqlMap namespace="Category">
<cacheModel id="categoryCache" type="MEMORY">
<flushInterval hours= "12" />
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