java.sql.SQLException: An attempt by a client to checkout a Connection has timed out
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java程序运行中报异常：
java.sql.SQLException: An attempt by a client to checkout a Connection has timed out
原因：
由于使用c3p0连接，程序执行完数据库操纵没有关闭数据库连接，导致整个程序无法执行数据库操作，而抛出异常
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