java.sql.SQLException
出错：java.sql.SQLException: com.mchange.v2.c3p0.ComboPooledDataSource[ identityToken -> 1hge1369r17bpqrj1ofbtr0|7ec1e7a5, dataSourceName -> 1hge1369r17bpqrj1ofbtr0|7ec1e7a5 ] has been closed() -- you can no longer use it.
出错原因：我在不合适的时候把c3p0的连接给关了