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statement N connection

 
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what happens if forgot to close both connection and statement ?
 
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That could slow down your future db connections until the connections are reclaimed.
 
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Databases have a limited number of connections available. When you close a JDBC connection, you tell the driver to release the database connection. If you don't, you may run out of database connections. What happens after that is implementation dependent, but generally not good.
 
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