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Spring Boot 4 MyBatis

2024-08-14 11:16:48   215人阅读

SpringBoot内使用MyBatis，可以不使用xml映射配置，通过注解方式映射。

pom.xml添加依赖

    <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>1.1.1</version>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>5.1.21</version>        </dependency>

在application.properties配置文件中添加

spring.datasource.url=jdbc:mysql://localhost:3306/test2spring.datasource.username=rootspring.datasource.password=hongda$123456spring.datasource.driver-class-name=com.mysql.jdbc.Driver

这样配置，可以操作数据库中的数据，但是表跟数据库必须自己创建，跟Hibernate有点不一样。

使用MyBatis:

 

public class User {    private Long id;    private String name;    private Integer age;    public Long getId() {        return id;    }    public void setId(Long id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Integer getAge() {        return age;    }    public void setAge(Integer age) {        this.age = age;    }}

操作：

@Mapperpublic interface UserMapper {    @Select("SELECT * FROM user WHERE name = #{name}")    User findByName(@Param("name") String name);    @Results({            @Result(property = "name", column = "name"),            @Result(property = "age", column = "age")    })    @Select("SELECT name, age FROM user")    List<User> findAll();    @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})")    int insert(@Param("name") String name, @Param("age") Integer age);    @Update("UPDATE user SET age=#{age} WHERE name=#{name}")    void update(User user);    @Delete("DELETE FROM user WHERE id =#{id}")    void delete(Long id);    @Insert("INSERT INTO user(name, age) VALUES(#{name}, #{age})")    int insertByUser(User user);    @Insert("INSERT INTO user(name, age) VALUES(#{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER})")    int insertByMap(Map<String, Object> map);}

运行:

@RunWith(SpringJUnit4ClassRunner.class)@SpringApplicationConfiguration(classes = Application.class)@Transactionalpublic class ApplicationTests {    @Autowired    private UserMapper userMapper;    @Test    @Rollback    public void testUserMapper() throws Exception {        // insert一条数据，并select出来验证        userMapper.insert("AAA", 20);        User u = userMapper.findByName("AAA");        Assert.assertEquals(20, u.getAge().intValue());        // update一条数据，并select出来验证        u.setAge(30);        userMapper.update(u);        u = userMapper.findByName("AAA");        Assert.assertEquals(30, u.getAge().intValue());        // 删除这条数据，并select验证        userMapper.delete(u.getId());        u = userMapper.findByName("AAA");        Assert.assertEquals(null, u);        u = new User("BBB", 30);        userMapper.insertByUser(u);        Assert.assertEquals(30, userMapper.findByName("BBB").getAge().intValue());        Map<String, Object> map = new HashMap<>();        map.put("name", "CCC");        map.put("age", 40);        userMapper.insertByMap(map);        Assert.assertEquals(40, userMapper.findByName("CCC").getAge().intValue());        List<User> userList = userMapper.findAll();        for(User user : userList) {            Assert.assertEquals(null, user.getId());            Assert.assertNotEquals(null, user.getName());        }    }}

 

http://blog.didispace.com/mybatisinfo/

Spring Boot 4 MyBatis


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