mybatis mapper互相引用resultMap启动出错的解决_Java教程

mybatis mapper互相引用resultMap启动出错的解决

2021-12-03 14:26隔壁的老司机 Java教程

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mybatis mapper互相引用resultMap启动出错

问题

Caused by: java.lang.IllegalArgumentException: Result Maps collection does not contain value for kulink.cvscloud.core.mapper.OrderSundryMapper.BaseResultMap
at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:888) ~[mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.session.Configuration.getResultMap(Configuration.java:640) ~[mybatis-3.4.5.jar:3.4.5]
at org.apache.ibatis.builder.MapperBuilderAssistant.getStatementResultMaps(MapperBuilderAssistant.java:344) ~[mybatis-3.4.5.jar:3.4.5]

... 73 common frames omitted

原因

因为mybatis扫描加载的时候，是按顺序加载的A-Z，因为mapperA中引用mapperB中的ResultMap

但是启动加载的时候mapperB加载在mapperA之后，所以造成mapperB.ResultMap找不到的问题。

解决方法

升级新版本，已经解决这个问题了

或者在引用mapper.xml中把resultMap直接复制过来

mybatis resultMap引发的吐血bug

简单的讲

问题背景：如果在写mybatis中的resultMap时，不下心将resultMapde id写成映射接口的名字，会发生什么？

结论：单元测试进度条卡住但不报错， Tomcat运行不报错，但是不加载项目

以下是详细的

需求：从数据库中加载之前插入log日志，打印在某一页面上。

如：

mybatis mapper互相引用resultMap启动出错的解决

Java中的pojo：

package pojo;
import java.io.Serializable;
import java.util.Date;
/**
* 系统日志
*
* @author Administrator
*/
public class Log implements Serializable {
  private static final long serialVersionUID = -7372303516713218870L;
  private int id;//
  private int userId;//
  private String userName;
  private Date createDate;//创建日期
  private String content;//日志内容
  private String operation;//用户所做的操作
  private String url;//用户所做的操作
  public Log() {
  }
  public Log(int id, int userId, String userName, Date createDate, String content, String operation, String url) {
      this.id = id;
      this.userId = userId;
      this.userName = userName;
      this.createDate = createDate;
      this.content = content;
      this.operation = operation;
      this.url = url;
  }
  public static long getSerialVersionUID() {
      return serialVersionUID;
  }
  public int getId() {
      return id;
  }
  public void setId(int id) {
      this.id = id;
  }
  public int getUserId() {
      return userId;
  }
  public void setUserId(int userId) {
      this.userId = userId;
  }
  public String getUserName() {
      return userName;
  }
  public void setUserName(String userName) {
      this.userName = userName;
  }
  public Date getCreateDate() {
      return createDate;
  }
  public void setCreateDate(Date createDate) {
      this.createDate = createDate;
  }
  public String getContent() {
      return content;
  }
  public void setContent(String content) {
      this.content = content;
  }
  public String getOperation() {
      return operation;
  }
  public void setOperation(String operation) {
      this.operation = operation;
  }
  public String getUrl() {
      return url;
  }
  public void setUrl(String url) {
      this.url = url;
  }
  @Override
  public String toString() {
      return "Log{" +
              "id=" + id +
              ", userId=" + userId +
              ", userName='" + userName + '\'' +
              ", createDate=" + createDate +
              ", content='" + content + '\'' +
              ", operation='" + operation + '\'' +
              ", url='" + url + '\'' +
              '}';
  }
}

利用mybatis读取数据时，发生不可理解的事情

mybatis mapper互相引用resultMap启动出错的解决

public List<Log> listAll();
  <resultMap id="LogMapper" type="Log">
      <id column="userid" property="userId"/>
      <result column="username" property="userName"/>
      <result column="content" property="content"/>
      <result column="operation" property="operation"/>
      <result column="createdate" property="createDate"/>
      <result column="url" property="url"/>
  </resultMap>
  <select id="listAll"   resultMap="LogMapper">
      SELECT * FROM t_log
  </select>

程序一旦单元测试就会进入这样的状态，

mybatis mapper互相引用resultMap启动出错的解决