* 使用mybatis举例，使用注解方式实现* 不需要针对UserMapperI接口去编写具体的实现类代码，这个具体的实现类由MyBatis帮我们动态构建出来，我们只需要直接拿来使用即可。* 1、导入jar包：mybatis和mysql-connector* 2、mybatis配置文件：mybatis-config.xml，加载Mapper接口路径* 3、编写JavaBean类：UserBean* 4、编写执行sql接口* 5、编写测试类进行测试 mybatis-config-zhujie.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 <!--从外部配置文件导入jdbc信息-->
7 <properties resource="jdbc.properties"></properties>
8
9 <environments default="development">
10 <environment id="development">
11 <transactionManager type="JDBC"/>
12 <dataSource type="POOLED">
13 <property name="driver" value="${driver}"/>
14 <property name="url" value="${url}"/>
15 <property name="username" value="${username}"/>
16 <property name="password" value="${password}"/>
17 </dataSource>
18 </environment>
19 </environments>
20
21 <!--指定映射资源文件-->
22 <mappers>
23 <mapper class="zhujie.UserMapperInterface"></mapper>
24
25 </mappers>
26 </configuration>
UserMapperInterface.java
1 package zhujie;
2
3 import bean.UserSalary;
4 import first.UserBean;
5 import org.apache.ibatis.annotations.Delete;
6 import org.apache.ibatis.annotations.Insert;
7 import org.apache.ibatis.annotations.Select;
8 import org.apache.ibatis.annotations.Update;
9
10 import java.util.List;
11
12 /*
13 * 使用mybatis举例，使用注解方式实现
14 * 不需要针对UserMapperI接口去编写具体的实现类代码，这个具体的实现类由MyBatis帮我们动态构建出来，我们只需要直接拿来使用即可。
15 * 1、导入jar包：mybatis和mysql-connector
16 * 2、mybatis配置文件：mybatis-config.xml，加载Mapper接口路径
17 * 3、编写JavaBean类：UserBean
18 * 4、编写执行sql接口
19 * 5、编写测试类进行测试，自动实例化，调用方法
20 * */
21 public interface UserMapperInterface {
22
23 // UserBean
24 @Select("select * from user where id = #{id}")
25 public UserBean selectOneUser(int id);
26
27 @Select("select * from user")
28 public List<UserBean> selectAllUser();
29
30 @Insert("insert into user (id, name, age) values (#{id} ,#{name}, #{age})")
31 public int insertUser(UserBean userBean);
32
33 @Update("update user set name=#{name} where id=#{id}")
34 public int updateUser(UserBean userBean);
35
36 @Delete("delete from user where id=#{id}")
37 public int deleteById(int id);
38
39 @Delete("delete from user where id=#{id}")
40 public int deleteByUserBean(UserBean userBean);
41
42 // 使用User和Salary表联合查询
43 @Select("select u.id, u.name, u.age, s.salary from user u, salary s where u.name = s.name and u.name = #{name}")
44 public UserSalary selectOneUserSalary(String name);
45
46 }
TestZhuJie.java
1 package zhujie;
2
3 import bean.UserSalary;
4 import first.UserBean;
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 import org.junit.After;
10 import org.junit.Before;
11 import org.junit.Ignore;
12 import org.junit.Test;
13
14 import java.io.IOException;
15 import java.io.InputStream;
16 import java.util.List;
17
18 /*
19 * 使用mybatis举例，使用注解方式实现
20 * 不需要针对UserMapperI接口去编写具体的实现类代码，这个具体的实现类由MyBatis帮我们动态构建出来，我们只需要直接拿来使用即可。
21 * 1、导入jar包：mybatis和mysql-connector
22 * 2、mybatis配置文件：mybatis-config.xml，加载Mapper接口路径
23 * 3、编写JavaBean类：UserBean
24 * 4、编写执行sql接口
25 * 5、编写测试类进行测试
26 * */
27 public class TestZhuJie {
28 String resource = "mybatis-config-zhujie.xml";
29 SqlSessionFactory sqlSessionFactory = null;
30 SqlSession session = null;
31
32 @Before
33 public void before() {
34 // System.out.println("Before");
35 try {
36 InputStream inputStream = Resources.getResourceAsStream(resource);
37 // 创建工厂
38 sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
39 // 创建session对象
40 session = sqlSessionFactory.openSession();
41
42 } catch (IOException e) {
43 e.printStackTrace();
44 }
45 }
46
47 @After
48 public void close() {
49 session.close();
50 // System.out.println("After");
51 }
52
53 @Test
54 public void testSelectOneUser() {
55 // 接口自动实例化
56 UserMapperInterface userMapperInterface = session.getMapper(UserMapperInterface.class);
57 // 执行sql
58 UserBean userBean = userMapperInterface.selectOneUser(1);
59 System.out.println(userBean);
60 }
61
62 // 批量查询
63 @Test
64 public void testSelectAllUser() {
65 // 接口自动实例化
66 UserMapperInterface userMapperInterface = session.getMapper(UserMapperInterface.class);
67 // 执行sql
68 List<UserBean> listUserBean = userMapperInterface.selectAllUser();
69 System.out.println("记录个数：" + listUserBean.size());
70 System.out.println(listUserBean);
71 }
72
73 @Ignore
74 @Test
75 public void testInsertUser() {
76 UserBean userBean = new UserBean("CoCo2", "50");
77 UserMapperInterface userMapperInterface = session.getMapper(UserMapperInterface.class);
78 int n = userMapperInterface.insertUser(userBean);
79 // 提交
80 session.commit();
81 System.out.println("插入数据成功：" + userBean);
82 }
83
84 @Ignore
85 @Test
86 public void testUpdateUser() {
87 UserBean userBean = new UserBean(2, "Tom44", "40");
88 UserMapperInterface userMapperInterface = session.getMapper(UserMapperInterface.class);
89 userMapperInterface.updateUser(userBean);
90 session.commit();
91 System.out.println("修改数据成功：" + userBean);
92 }
93
94 @Ignore
95 @Test
96 public void testDeleteUser() {
97 UserBean userBean = new UserBean(15, "XXX", "40");
98 UserMapperInterface userMapperInterface = session.getMapper(UserMapperInterface.class);
99 int n = userMapperInterface.deleteByUserBean(userBean);
100 session.commit();
101 System.out.println("删除数据成功：" + userBean);
102 System.out.println("操作成功记录数：" + n);
103 }
104
105 @Test
106 public void testSelectOneUserSalary() {
107 // 接口自动实例化
108 UserMapperInterface userMapperInterface = session.getMapper(UserMapperInterface.class);
109 // 执行sql
110 UserSalary userSalary = userMapperInterface.selectOneUserSalary("Tom");
111 System.out.println(userSalary);
112 }
113
114 }
原文地址：https://www.cnblogs.com/gongxr/p/8288168.html
时间： 2024-10-03 22:32:22