个回答

• 琥珀川振早见

  2017-09-19 21:23:23

  请问这个问题你是怎么解决的呀，我也遇到了同样的问题。

  1

• 慕用9049269

  2016-08-24 18:55:19

  实体没有少属性啊，还是包错

  
  

  
  

  实体：command,

  public class Command {

  //指令id

  private Integer id;

  //指令名称

  private String name;

  //指令描述

  private String description;

  //一条指令对应的回复列表

  private List<CommandContent> contenList;

  public Integer getId() {

  return id;

  }

  public void setId(Integer id) {

  this.id = id;

  }

  public String getName() {

  return name;

  }

  public void setName(String name) {

  this.name = name;

  }

  public String getDescription() {

  return description;

  }

  public void setDescription(String description) {

  this.description = description;

  }

  public List<CommandContent> getContenList() {

  return contenList;

  }

  public void setContenList(List<CommandContent> contenList) {

  this.contenList = contenList;

  }

  }

  实体：command,

  public class CommandContent {
  

  //回复内容的ID

  private Integer id;

  //回复的内容

  private String content;

  //指令表的ID

  private Integer commandId;

  public Integer getId() {

  return id;

  }

  public void setId(Integer id) {

  this.id = id;

  }

  public String getContent() {

  return content;

  }

  public void setContent(String content) {

  this.content = content;

  }

  public Integer getCommandId() {

  return commandId;

  }

  public void setCommandId(Integer commandId) {

  this.commandId = commandId;

  }

  }
  

  
  

  配置信息：command.xml

  <?xml version="1.0" encoding="UTF-8"?>

  <!DOCTYPE mapper

      PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"

      "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

  
  

  <mapper namespace="Command">

    <resultMap type="com.imooc.bean.Command" id="Command">

      <id column="c_id" jdbcType="INTEGER" property="id"/>

      <result column="name" jdbcType="VARCHAR" property="name"/>

      <result column="description" jdbcType="VARCHAR" property="description"/>

      <collection property="contentList"  resultMap="CommandContent.content"/>

    </resultMap>

    

     <select id="queryCommandList" parameterType="com.imooc.bean.Command" resultMap="Command">

      select a.id c_id,a.name,a.description,b.id,b.content,b.commandId 

      from command a left join command_content b

      on a.id = b.commandId

      <where>

      <if test="name != null and !&quot;&quot;.equals(name.trim())">

      and a.name=#{name}

     </if>

     <if test="description != null and !&quot;&quot;.equals(description.trim())">

      and a.description like '%' #{description} '%'

     </if>

      </where>

    </select>

  </mapper>
  

  错误信息：

  2016-08-24 18:48:04,035 [http-apr-8080-exec-2] DEBUG [Command.queryCommandList] - ==>  Preparing: select a.id c_id,a.name,a.description,b.id,b.content,b.commandId from command a left join command_content b on a.id = b.commandId WHERE a.name=? 

  2016-08-24 18:48:04,106 [http-apr-8080-exec-2] DEBUG [Command.queryCommandList] - ==> Parameters: test(String)

  org.apache.ibatis.exceptions.PersistenceException: 

  ### Error querying database.  Cause: java.lang.IllegalArgumentException: Result Maps collection does not contain value for CommandContent.content

  ### The error may exist in com/imooc/config/sqlxml/Command.xml

  ### The error may involve Command.queryCommandList-Inline

  ### The error occurred while setting parameters

  ### SQL: select a.id c_id,a.name,a.description,b.id,b.content,b.commandId      from command a left join command_content b     on a.id = b.commandId      WHERE  a.name=?

  ### Cause: java.lang.IllegalArgumentException: Result Maps collection does not contain value for CommandContent.content

  
  

  at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)

  at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:111)

  at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)

  at com.imooc.dao.CommandDao.queryCommandList(CommandDao.java:31)

  at com.imooc.service.QueryService.queryByCommand(QueryService.java:58)

  at com.imooc.servlet.AutoReplyServlet.doGet(AutoReplyServlet.java:26)

  at com.imooc.servlet.AutoReplyServlet.doPost(AutoReplyServlet.java:34)

  
  

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)

  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)

  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:503)

  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)

  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:421)

  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.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2462)

  at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2451)

  at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)

  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)

  at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)

  at java.lang.Thread.run(Thread.java:619)

  Caused by: java.lang.IllegalArgumentException: Result Maps collection does not contain value for CommandContent.content

  at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:797)

  
  

  at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:550)

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getNestedResultMap(DefaultResultSetHandler.java:836)

  
  

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyNestedResultMappings(DefaultResultSetHandler.java:775)

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:747)

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForNestedResultMap(DefaultResultSetHandler.java:713)

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:264)

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:236)

  at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:150)

  at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:60)

  at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)

  at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)

  at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)

  at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)

  at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96)

  at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77)

  at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)

  ... 25 more

  
  
  

  
  

  0

• 血色玫瑰之海

  2016-08-24 17:59:53

  你要·实体类里面是不是少了属性？？可以再仔细看看，或者是不是属性名打错了

  
  

  0