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14.7. Dead connections
The JDBC protocol does not provide a natural
connectionErrorOccured() event when a connection is broken. To support dead/broken connection checking there are a number of plugins.
14.7.1. Valid connection checking
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The simplest format is to just run a "quick" sql statement:
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before handing the connection to the application. If this fails, another connection is selected until there are no more connections at which point new connections are constructed.
<check-valid-connection-sql>select 1 from dual</check-valid-connection-sql>
<check-valid-connection-sql>select 1 from dual</check-valid-connection-sql>
The potentially more performant check is to use vendor specific features, e.g. Oracle's or MySQL's pingDatabase() via the
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<valid-connection-checker-class-name/>
<valid-connection-checker-class-name/>
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