多个对象对应一个对象时，应该如何进行查询？
例如
关键字：association : 联系 ，关联 多个人可以关联一个人。
首先做一些准备,如:实体类,工具类和Mybatis核心文件
实体类：
//老师实体类
package com.MLXH.pojo;
public class Teacher {
private int id;
private String name;
public Teacher() {
}
public Teacher(int id, String name) {
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Teacher{" +
"id=" + id +
", name='" + name + '\'' +
'}';
}
}
//学生实体类
package com.MLXH.pojo;
public class Student {
private int id;
private String name;
private Teacher teacher;
public Student() {
}
public Student(int id, String name, Teacher teacher) {
this.id = id;
this.name = name;
this.teacher = teacher;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", name='" + name + '\'' +
", teacher=" + teacher +
'}';
}
}
database.properties配置文件数据库需要的数据
driver = com.mysql.jdbc.Driver url = jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf-8 username = root password = 123456
Mybatis工具类:mybatis-config.xml
<?xml version="<div style="color:transparent">本文来源gaodai.ma#com搞##代!^码@网*</div>1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--配置文件修改-->
<properties resource="database.properties"/>
<!--Mybatis设置-->
<settings>
<!--默认日志实现-->
<!--<setting name="logImpl" value="STDOUT_LOGGING"/>-->
<!--Log4j实现-->
<setting name="logImpl" value="LOG4J"/>
</settings>
<!--配置别名-->
<typeAliases>
<package name="com.MLXH.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${password}"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--class对应的是一个接口类-->
<!--resource对应的是一个接口类的映射文件-->
<mapper resource="com/MLXH/dao/StudentMapper.xml"/>
</mappers>
</configuration>
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转载请注明原文链接：Mybatis中多个对象包含同一个对象的处理操作
转载请注明原文链接：Mybatis中多个对象包含同一个对象的处理操作
