1、domain类
1 package com.xiaostudy.mybatis.domain;
2
3 /**
4 * @desc domain类
5 * @author xiaostudy
6 *
7 */
8 public class User {
9 private int id;
10 private String username;
11 private String password;
12
13 public int getId() {
14 return id;
15 }
16
17 public void setId(int id) {
18 this.id = id;
19 }
20
21 public String getUsername() {
22 return username;
23 }
24
25 public void setUsername(String username) {
26 this.username = username;
27 }
28
29 public String getPassword() {
30 return password;
31 }
32
33 public void setPassword(String password) {
34 this.password = password;
35 }
36
37 @Override
38 public String toString() {
39 return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
40 }
41
42 }
2、代理的dao接口
1 package com.xiaostudy.mybatis.mapper;
2
3 import java.io.IOException;
4 import java.util.List;
5
6 import com.xiaostudy.mybatis.dao.SetGetDomain;
7 import com.xiaostudy.mybatis.domain.User;
8
9 /**
10 * @desc dao接口
11 * @author xiaostudy
12 *
13 */
14 public interface MapperDao {
15
16 /**
17 * @desc 根据用户ID查询用户信息
18 * @param id 参数
19 * @return User 返回类型
20 * @throws Exception 异常
21 */
22 public User findUserById(int id) throws Exception;
23
24 /**
25 * @desc 根据用户的综合信息来查询用户
26 * @param user 参数
27 * @return User 返回类型
28 * @throws Exception 异常
29 */
30 public User findUser(SetGetDomain user) throws Exception;
31
32 /**
33 * @desc 根据用户名称查询用户信息
34 * @param username 参数
35 * @return User 返回类型
36 * @throws Exception 异常
37 */
38 public User findUserByUsername(String username) throws Exception;
39
40 /**
41 * @desc 根据用户名称模糊查询list集合
42 * @param username 参数
43 * @return List<User> 返回类型
44 * @throws IOException 异常
45 */
46 public List<User> findUserByUsernames(String username) throws IOException;
47
48 /**
49 * @desc 查询所有用户
50 * @return List<User> 返回类型
51 * @throws IOException 异常
52 */
53 public List<User> findAllUser() throws IOException;
54
55 /**
56 * @desc 添加用户
57 * @param user 参数
58 * @return int 返回类型
59 * @throws IOException 异常
60 */
61 public int insertUser(User user) throws IOException;
62
63 /**
64 * @desc 根据用户id修改用户名称
65 * @param user 参数
66 * @return int 返回类型
67 * @throws IOException 异常
68 */
69 public int updateUserUsername(User user) throws IOException;
70
71 /**
72 * @desc 根据用户id修改用户名称和密码
73 * @param user 参数
74 * @return int 返回类型
75 * @throws IOException 异常
76 */
77 public int updateUserUsernamePassword(User user) throws IOException;
78
79 }
3、代理的dao配置文件
1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
3 "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
4
5 <!-- namespace:命名空间,对statement的信息进行分类管理 -->
6 <!-- 注意:在mapper代理时,它具有特殊及重要的作用 -->
7 <mapper namespace="com.xiaostudy.mybatis.mapper.MapperDao">
8
9 <select id="findUser" parameterType="com.xiaostudy.mybatis.dao.SetGetDomain" resultType="user">
10 SELECT * FROM USER
11 <where>
12 <if test="user != null">
13 <if test="user.id != null and user.id != ''">
14 and id=#{id}
15 </if>
16 <if test="user.password != null and user.password !=''">
17 and password=#{password}
18 </if>
19 </if>
20 </where>
21 </select>
22
23 <!-- 根据用户ID查询用户信息 -->
24 <!-- select:表示一个MappedStatement对象 -->
25 <!-- id:statement的唯一标示 -->
26 <!-- #{}:表示一个占位符? -->
27 <!-- #{id}:里面的id表示输入参数的参数名称,如果该参数是简单类型,那么#{}里面的参数名称可以任意 -->
28 <!-- parameterType:输入参数的java类型 -->
29 <!-- resultType:输出结果的所映射的java类型(单条结果所对应的java类型) -->
30 <select id="findUserById" parameterType="int" resultType="com.xiaostudy.mybatis.domain.User">
31 SELECT * FROM USER WHERE id = #{id}
32 </select>
33
34 <!-- 根据用户名称查询指定用户 -->
35 <select id="findUserByUsername" parameterType="java.lang.String" resultType="com.xiaostudy.mybatis.domain.User">
36 SELECT * FROM USER WHERE username = #{username}
37 </select>
38
39 <!-- 根据用户名称模糊查询list集合 -->
40 <select id="findUserByUsernames" parameterType="java.lang.String" resultType="com.xiaostudy.mybatis.domain.User">
41 SELECT * FROM USER WHERE username LIKE #{username}
42 </select>
43
44 <!-- 根据所有用户 -->
45 <select id="findAllUser" resultType="com.xiaostudy.mybatis.domain.User">
46 SELECT * FROM USER
47 </select>
48
49 <!-- 添加用户 -->
50 <insert id="insertUser" parameterType="com.xiaostudy.mybatis.domain.User">
51 <selectKey keyProperty="id" resultType="int" order="AFTER">
52 select last_insert_id()
53 </selectKey>
54 insert into user (username, password) values (#{username}, #{password})
55 </insert>
56
57 <!-- 修改用户名称 -->
58 <update id="updateUserUsername" parameterType="com.xiaostudy.mybatis.domain.User">
59 update user set username=#{username} where id=#{id}
60 </update>
61
62 <!-- 修改用户名称和密码 -->
63 <update id="updateUserUsernamePassword" parameterType="com.xiaostudy.mybatis.domain.User">
64 update user set username=#{username}, password=#{password} where id=#{id}
65 </update>
66
67 </mapper>
4、动态sql用到的get类
1 package com.xiaostudy.mybatis.dao;
2
3 import com.xiaostudy.mybatis.domain.User;
4
5 /**
6 * @desc 动态sql用到的get类
7 * @author xiaostudy
8 *
9 */
10 public class SetGetDomain {
11
12 private User user;
13
14 public User getUser() {
15 return user;
16 }
17
18 public void setUser(User user) {
19 this.user = user;
20 }
21
22 public int getId() {
23 return user.getId();
24 }
25
26 public String getPassword() {
27 return user.getPassword();
28 }
29
30 public String getUsername() {
31 return user.getUsername();
32 }
33
34
35 }
5、测试类
1 package com.xiaostudy.mybatis.mapper;
2
3 import java.io.InputStream;
4
5 import org.apache.ibatis.io.Resources;
6 import org.apache.ibatis.session.SqlSession;
7 import org.apache.ibatis.session.SqlSessionFactory;
8 import org.apache.ibatis.session.SqlSessionFactoryBuilder;
9
10 import com.xiaostudy.mybatis.dao.SetGetDomain;
11 import com.xiaostudy.mybatis.domain.User;
12
13 public class MybatisTest {
14
15 public static void main(String[] args) throws Exception {
16 String resource = "config/SqlMapConfig.xml";
17 InputStream inputStream = Resources.getResourceAsStream(resource);
18
19 // 创建SqlSessionFactory
20 SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
21
22 // 创建SqlSession
23 SqlSession sqlSession = sqlSessionFactory.openSession();
24
25 //获取一个代理dao实现
26 MapperDao mapperDao = sqlSession.getMapper(MapperDao.class);
27
28 //进行动态sql需要的domain类的get方法类,和domain属性的get方法
29 SetGetDomain setGetDomain = new SetGetDomain();
30
31 //新建一个domain类
32 User user = new User();
33 user.setId(8);
34 user.setUsername("haha");
35 user.setPassword("2019");
36
37 //通过set方法,把domain包装
38 setGetDomain.setUser(user);
39
40 User user2 = mapperDao.findUser(setGetDomain);
41
42 System.out.println(user2);
43
44 sqlSession.close();
45 }
46
47 }
6、db.properties
1 db.driver=com.mysql.jdbc.Driver
2 db.url=jdbc:mysql://localhost:3306/user?useUnicode=true&characterEncoding=utf8
3 db.username=root
4 db.password=123456
7、SqlMapConfig.xml
1 <?xml version="1.0" encoding="UTF-8" ?>
2 <!DOCTYPE configuration
3 PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
4 "http://mybatis.org/dtd/mybatis-3-config.dtd">
5 <configuration>
6
7 <!-- 加载java的配置文件 -->
8 <properties resource="config/db.properties"/>
9
10 <typeAliases>
11 <!-- 单个别名定义,动态sql中用到 -->
12 <typeAlias type="com.xiaostudy.mybatis.domain.User" alias="user"/>
13
14 <!-- 批量别名定义(推荐) -->
15 <!-- package:指定包名称来为该包下的po类声明别名,默认的别名就是类名(首字母大小写都可) -->
16 <!-- <package name="com.xiaostudy.mybatis.domain" /> -->
17 </typeAliases>
18
19 <!-- 配置mybatis的环境信息,与spring整合,该信息由spring来管理 -->
20 <environments default="development">
21 <environment id="development">
22 <!-- 配置JDBC事务控制,由mybatis进行管理 -->
23 <transactionManager type="JDBC"></transactionManager>
24 <!-- 配置数据源,采用mybatis连接池 -->
25 <dataSource type="POOLED">
26 <property name="driver" value="${db.driver}" />
27 <property name="url" value="${db.url}" />
28 <property name="username" value="${db.username}" />
29 <property name="password" value="${db.password}" />
30 </dataSource>
31 </environment>
32 </environments>
33
34 <!-- 加载映射文件 -->
35 <mappers>
36 <mapper resource="config/User.xml" />
37 <mapper resource="com/xiaostudy/mybatis/mapper/MapperDao.xml" />
38 </mappers>
39
40 </configuration>
8、log4j.properties
1 # Global logging configuration
2 log4j.rootLogger=DEBUG, stdout
3 # Console output...
4 log4j.appender.stdout=org.apache.log4j.ConsoleAppender
5 log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
6 log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
讲解