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问题日志：
java.sql.SQLException: I/O Error: Read timed out at net.sourceforge.jtds.jdbc.TdsCore.executeSQL(TdsCore.java:1053) ~[jtds-1.2.5.jar:1.2.5] at net.sourceforge.jtds.jdbc.JtdsStatement.executeSQLQuery(JtdsStatement.java:465) ~[jtds-1.2.5.jar:1.2.5] at net.sourceforge.jtds.jdbc.JtdsStatement.executeQuery(JtdsStatement.java:1304) ~[jtds-1.2.5.jar:1.2.5] at net.sf.log4jdbc.sql.jdbcapi.StatementSpy.executeQuery(StatementSpy.java:731) ~[log4jdbc-log4j2-jdbc4-1.16.jar:na] at com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:73) [c3p0-0.9.1.2.jar:0.9.1.2] at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.testPooledConnection(C3P0PooledConnectionPool.java:374) [c3p0-0.9.1.2.jar:0.9.1.2] at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledCon
