MyBatis的学习之路(二)

    上篇文章介绍了MyBatis的配置文件，现在来介绍实体映射文件Mapper.xml。

    说道实体映射文件，就不得不说一下实体与表之间的映射关系：单表映射和多表映射。

    a. 单表映射

1 public class Admin{
2     private String id;
3     private String name;
4     private String password;
5     //三个属性的setter和getter方法
6 }

    映射文件

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE mapper
 3         PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
 4         "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
 5 <mapper namespace="yitian.study.dao.mapper">
 6     <resultMap id="adminMapper" type="com.xxx.entity.Admin">
 7         <id property="id" column="id"/>
 8         <result property="name" column="name"/>
 9         <result property="password" column="password"/>
10     </resultMap>
11     <select id="selectAdmin"
12             resultType="Admin" parameterType="Admin">
13         SELECT *
14         FROM Admin
15         WHERE id = #{id}
16     </select>
17     <select id="selectAdminByName"
18             resultType="Admin">
19         SELECT *
20         FROM Admin
21         WHERE name = #{name}
22     </select>
23     <insert id="insertAdmin"
24             useGeneratedKeys="true">
25         INSERT INTO Admin (name, password) VALUES (#{name}, #{password})
26     </insert>
27     <update id="updateAdmin">
28         UPDATE Admin
29         SET password = #{password}
30         WHERE id = #{id}
31     </update>
32     <delete id="deleteAdmin">
33         DELETE FROM Admin
34         WHERE id = #{id}
35     </delete>
36 </mapper>

View Code