那count可以用的吗？？？能不能说一下count该怎么用呢？？？如果不行我就写原生sql了

嗯！SELECT playerID，COUNT(playerID) FROM pet GROUP BY playerID;那么请问应该怎么用呢？？还有个问题就是，我取别名的话，是没问题的吧？？

好吧！！！容我最后再问个问题~~~~我搞了一个下午！！！就是我将nutz的项目部署到tomcat上（没有eclipse，纯tomcat）！！！然后我可以进8080页面，但是我的nutz框架并没有运行起来！！请问你知道怎么回事吗？？tomcat上运行日志没有报错，就是纯没有运行项目

没有呀！放在webapp下面的，然后我可以输入login的页面，出来了背景图，但是没有登录页面等！！！就是这个项目没有启动

对对！然后日志里好像是堵塞了！就一直没有进行下去，也没加载数据库

信息: Initializing ProtocolHandler ["ajp-apr-8009"]
九月 05, 2017 10:43:16 上午 org.apache.catalina.startup.Catalina load
信息: Initialization processed in 1037 ms
九月 05, 2017 10:43:16 上午 org.apache.catalina.core.StandardService startInternal
信息: Starting service Catalina
九月 05, 2017 10:43:16 上午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.81
九月 05, 2017 10:43:16 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\Backend
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.TldConfig execute
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\Backend has finished in 1,553 ms
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\docs
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\docs has finished in 28 ms
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\examples
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\examples has finished in 144 ms
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\host-manager
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\host-manager has finished in 34 ms
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\manager
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\manager has finished in 32 ms
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\ROOT
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\ROOT has finished in 25 ms
九月 05, 2017 10:43:18 上午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["http-apr-8080"]
九月 05, 2017 10:43:18 上午 org.apache.coyote.AbstractProtocol start
信息: Starting ProtocolHandler ["ajp-apr-8009"]
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.Catalina start
信息: Server startup in 1868 ms
九月 05, 2017 10:43:21 上午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["http-apr-8080"]
九月 05, 2017 10:43:21 上午 org.apache.coyote.AbstractProtocol pause
信息: Pausing ProtocolHandler ["ajp-apr-8009"]
九月 05, 2017 10:43:21 上午 org.apache.catalina.core.StandardService stopInternal
信息: Stopping service Catalina
九月 05, 2017 10:43:21 上午 org.apache.coyote.AbstractProtocol stop
信息: Stopping ProtocolHandler ["http-apr-8080"]
九月 05, 2017 10:43:21 上午 org.apache.coyote.AbstractProtocol stop
信息: Stopping ProtocolHandler ["ajp-apr-8009"]

不好意思，那个我弄错了！不是，我只是将其中war文件弄出来了，就是放在tomcat的webapp上，然后我看了下，有体现，就是那个backend

信息: Starting service Catalina
九月 05, 2017 10:43:16 上午 org.apache.catalina.core.StandardEngine startInternal
信息: Starting Servlet Engine: Apache Tomcat/7.0.81
九月 05, 2017 10:43:16 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deploying web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\Backend
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.TldConfig execute
信息: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory
信息: Deployment of web application directory C:\Program Files (x86)\apache-tomcat-7.0.81-windows-x64\apache-tomcat-7.0.81\webapps\Backend has finished in 1,553 ms
九月 05, 2017 10:43:18 上午 org.apache.catalina.startup.HostConfig deployDirectory

然后我再eclipse上，去启动还Ok，然后部署到tomcat上就没反应，一直没有加载的样子！！！如果输入登录的路径，可以指向它的背景的那个地方，。但是没有输入框，只有背景！！和一个点击的按钮（按钮上的字也没有）,加载数据库也不行

直接放进去的，感觉导出war有点麻烦，直接将class中的直接弄上去的

好的老的，我去试试！