我使用listPage方法，如果用Cnd有时会触发下面的异常，Sql硬编码就不会出现这个异常

        return listPage(curPage,pageSize,Sqls.create("select * from sys_log order by create_time desc"));

 Cnd cnd = Cnd.NEW();
        if(!Lang.isEmpty(field)){
            cnd.where().and("logtype","=",field);
        }
        cnd.getOrderBy().desc("create_time");
        return listPage(curPage,pageSize,cnd);

Caused by: com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure

The last packet successfully received from the server was 37,255 milliseconds ago.  The last packet sent successfully to the server was 37,560 milliseconds ago.
	at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java:1218)
	at com.alibaba.druid.filter.FilterChainImpl.statement_executeQuery(FilterChainImpl.java:2473)
	at com.alibaba.druid.filter.FilterAdapter.statement_executeQuery(FilterAdapter.java:2503)
	at com.alibaba.druid.filter.FilterEventAdapter.statement_executeQuery(FilterEventAdapter.java:302)
	at com.alibaba.druid.filter.FilterChainImpl.statement_executeQuery(FilterChainImpl.java:2470)
	at com.alibaba.druid.proxy.jdbc.StatementProxyImpl.executeQuery(StatementProxyImpl.java:221)
	at com.alibaba.druid.pool.DruidPooledStatement.executeQuery(DruidPooledStatement.java:230)
	at org.nutz.dao.impl.sql.run.NutDaoExecutor._runSelect(NutDaoExecutor.java:246)
	at org.nutz.dao.impl.sql.run.NutDaoExecutor.exec(NutDaoExecutor.java:53)
	... 91 more
Caused by: com.mysql.cj.exceptions.CJCommunicationsException: Communications link failure

The last packet successfully received from the server was 37,255 milliseconds ago.  The last packet sent successfully to the server was 37,560 milliseconds ago.
	at sun.reflect.GeneratedConstructorAccessor698.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45005)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:61)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:105)
	at com.mysql.cj.exceptions.ExceptionFactory.createException(ExceptionFactory.java:151)
	at com.mysql.cj.exceptions.ExceptionFactory.createCommunicationsException(ExceptionFactory.java:167)
	at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:562)
	at com.mysql.cj.protocol.a.NativeProtocol.checkErrorMessage(NativeProtocol.java:732)
	at com.mysql.cj.protocol.a.NativeProtocol.sendCommand(NativeProtocol.java:671)
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryPacket(NativeProtocol.java:986)
	at com.mysql.cj.protocol.a.NativeProtocol.sendQueryString(NativeProtocol.java:921)
	at com.mysql.cj.NativeSession.execSQL(NativeSession.java:1154)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java:1186)
	... 99 more
Caused by: java.net.SocketException: Software caused connection abort: recv failed
	at java.net.SocketInputStream.socketRead0(Native Method)
	at java.net.SocketInputStream.socketRead(SocketInputStream.java:116)
	at java.net.SocketInputStream.read(SocketInputStream.java:171)
	at java.net.SocketInputStream.read(SocketInputStream.java:141)
	at com.mysql.cj.protocol.ReadAheadInputStream.fill(ReadAheadInputStream.java:107)
	at com.mysql.cj.protocol.ReadAheadInputStream.readFromUnderlyingStreamIfNecessary(ReadAheadInputStream.java:150)
	at com.mysql.cj.protocol.ReadAheadInputStream.read(ReadAheadInputStream.java:180)
	at java.io.FilterInputStream.read(FilterInputStream.java:133)
	at com.mysql.cj.protocol.FullReadInputStream.readFully(FullReadInputStream.java:64)
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:63)
	at com.mysql.cj.protocol.a.SimplePacketReader.readHeader(SimplePacketReader.java:45)
	at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:52)
	at com.mysql.cj.protocol.a.TimeTrackingPacketReader.readHeader(TimeTrackingPacketReader.java:41)
	at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:54)
	at com.mysql.cj.protocol.a.MultiPacketReader.readHeader(MultiPacketReader.java:44)
	at com.mysql.cj.protocol.a.NativeProtocol.readMessage(NativeProtocol.java:556)
	... 105 more