第一个问题：
我在做留言板程序时，因为留言数据可能较大需要将保存留言内容的字段gst_content设为TEXT类型允许为NULL，当留言为空时用rs.getString("gst_content")读取该字段会报如下错误： Servlet.service() for servlet jsp threw exceptionjava.sql.SQLException: [Microsoft][SQLServer 2000 Driver for JDBC]Underlying input stream returned zero bytes at com.microsoft.jdbc.base.BaseExceptions.createException(Unknown Source) at com.microsoft.jdbc.base.BaseExceptions.getException(Unknown Source) at com.microsoft.jdbc.base.BaseData.getString(Unknown Source) at com.microsoft.jdbc.base.BaseResultSet.getString(Unknown Source) at com.microsoft.jdbc.base.BaseResultSet.getString(Unknown Source) at org.apache.tomcat.dbcp.dbcp.DelegatingResultSet.getString(DelegatingResultSet.java:224) at org.apache.jsp.index_jsp._jspService(org.apache.jsp.index_jsp:177) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:322) at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291) at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744) at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527) at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80) at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684) at java.lang.Thread.run(Thread.java:595)不为空时读取正常，请问该用什么方式读取为空字符串的TEXT字段才不会出错？
第二个问题：
我想保存留言的时间，就用了一个TIMESTAMP类型的字段gst_time，但用rs.getTimestamp()方法读时又产生了类型不能转换的错误，请问SQLSERVER中有什么方式可以保存更改数据的时间，好像MYSQL可以。我应用什么方式保存这个时间？有实现代码更好。 这是我第一次求助，希望大家知道多少说多少，谢谢了！ 加一百分，不够我再加哦！
