Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Result consisted of more than

標籤：mysql   springmvc   hibernate   java web   jsp   

1、錯誤描述

at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.lang.Thread.run(Thread.java:745)Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Result consisted of more than one rowat sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)at java.lang.reflect.Constructor.newInstance(Constructor.java:526)at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)at com.mysql.jdbc.Util.getInstance(Util.java:386)at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2713)at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1794)at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1712)at org.apache.commons.dbcp.DelegatingStatement.executeUpdate(DelegatingStatement.java:225)

2、錯誤原因

     拼接SQL語句時，查詢中用到了子查詢

select t.name,t.age from t_student_info where t.id = (select d.stu_id from t_depart_info where t.depat_name = ‘computer‘);

     確定id時，要保證id是唯一的，但是這個子查詢可以查詢出兩個結果，這樣就會導致一個id對應多個結果，出現上述錯誤

3、解決辦法

（1）如果不是查詢唯一的一個，可以將“=”改為“in”

（2）如果是取唯一的一個，而子查詢結果中有重複的情況，可以用limit來限制

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Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Result consisted of more than