根据下面的配置信息,写出Classes,Teacher和Student这三个POJO的全部代码。<mapper namespace="com.lcb.mapping.userMapper"> <l--association—对—关联查询--> <select id="getClass" parameterType="int" resultMap="ClassesResultMap">select * from class c,teacher t where c.teacher_id=t.t_id and c.c_id=#{id} <select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap"><l--实体类的字段名和数据表的字段名映射--> <id property="id" column="c_id"/> <result property="name" column="c_name"/><association property="teacher" javaType="com.Icb.user.Teacher"><id property="id" column="t_id" l> <result property="name" column="t_name"/></association> </resultMap> <l--collection—对多关联查询--> <select id="getClass2" parameterType="int"resultMap="ClassesResultMap2"> select * from class c,teacher t,student s where c.teacher_id=t.t_idand c.c_id=s.class_id and c.c_id=#{ id} <select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap2"><id property=""id" column="c_id"/> <result property="name" column="c_name"/><association property="teacher" javaType="com.Icb.user.Teacher"><id property="id" column="t_id"l> <result property="name" column="t_name"/></association> <collection property="student" ofType="com.Icb.user.Student"><id property="id" column="s_id"/> cresult property="name" column="s_name"/></collection> </resultMap></mapper>
时间: 2023-06-02 22:04:41 浏览: 43
Classes POJO代码:
public class Classes {
private int id;
private int teacherId;
private String name;
private Teacher teacher;
//Getter and Setter
}
Teacher POJO代码:
public class Teacher {
private int id;
private String name;
//Getter and Setter
}
Student POJO代码:
public class Student {
private int id;
private String name;
private int age;
private int classId;
//Getter and Setter
}
相关问题
根据下面的配置信息,写出Classes,Teacher和Student这三个POJO的全部代码。<mapper namespace="com.lcb.mapping.userMapper"> <l--association—对—关联查询--> <select id="getClass" parameterType="int" resultMap="ClassesResultMap">select * from class c,teacher t where c.teacher_id=t.t_id and c.c_id=#{id} </select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap"><l--实体类的字段名和数据表的字段名映射--> <id property="id" column="c_id"/> <result property="name" column="c_name"/><association property="teacher" javaType="com.Icb.user.Teacher"><id property="id" column="t_id" l> <result property="name" column="t_name"/></association> </resultMap> <l--collection—对多关联查询--> <select id="getClass2" parameterType="int"resultMap="ClassesResultMap2"> select * from class c,teacher t,student s where c.teacher_id=t.t_idand c.c_id=s.class_id and c.c_id=#{ id} </select> <resultMap type="com.lcb.user.Classes" id="ClassesResultMap2"><id property=""id" column="c_id"/> <result property="name" column="c_name"/><association property="teacher" javaType="com.Icb.user.Teacher"><id property="id" column="t_id"l> <result property="name" column="t_name"/></association> <collection property="student" ofType="com.Icb.user.Student"><id property="id" column="s_id"/> cresult property="name" column="s_name"/></collection> </resultMap></mapper>
Classes POJO代码:
public class Classes {
private int c_id;
private String c_name;
private int teacher_id;
private Teacher teacher;
public int getC_id() {
return c_id;
}
public void setC_id(int c_id) {
this.c_id = c_id;
}
public String getC_name() {
return c_name;
}
public void setC_name(String c_name) {
this.c_name = c_name;
}
public int getTeacher_id() {
return teacher_id;
}
public void setTeacher_id(int teacher_id) {
this.teacher_id = teacher_id;
}
public Teacher getTeacher() {
return teacher;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
}
Teacher POJO代码:
public class Teacher {
private int t_id;
private String t_name;
private int age;
public int getT_id() {
return t_id;
}
public void setT_id(int t_id) {
this.t_id = t_id;
}
public String getT_name() {
return t_name;
}
public void setT_name(String t_name) {
this.t_name = t_name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Student POJO代码:
无相关信息,无法完成代码编写。
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "https://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.example.mybatiswebtest.mapper.PlayerMapper"> <select id="list" resultType="com.example.mybatiswebtest.pojo.Player"> SELECT * FROM test.player </select>
根据你提供的代码,这是一个符合 MyBatis 映射文件的基本结构。接下来,你需要将该映射文件与对应的映射接口或类进行关联。
在 `mapper` 标签中,`namespace` 属性指定了映射接口或类的完全限定名,这样 MyBatis 就能够将映射文件与对应的接口或类关联起来。在你的例子中,`namespace` 属性指定为 `com.example.mybatiswebtest.mapper.PlayerMapper`,这意味着该映射文件与 `PlayerMapper` 接口相关联。
```xml
<mapper namespace="com.example.mybatiswebtest.mapper.PlayerMapper">
<!-- 映射语句定义 -->
</mapper>
```
接下来,在 `mapper` 标签中,你已经定义了一个名为 "list" 的映射语句,并将结果映射为 `com.example.mybatiswebtest.pojo.Player` 类型。
```xml
<select id="list" resultType="com.example.mybatiswebtest.pojo.Player">
SELECT * FROM test.player
</select>
```
这个 `<select>` 标签定义了一个查询语句,将 `test.player` 表中的所有列和行映射为 `com.example.mybatiswebtest.pojo.Player` 类型的对象。
请确保你将该映射文件与对应的映射接口或类关联起来,并且在 MyBatis 的配置文件中正确配置了映射器扫描路径。这样 MyBatis 才能正确地找到并执行该映射语句。
如果你还有其他关于 MyBatis 的问题,欢迎继续提问。我将尽力帮助你。