1. 前言
Mybatis
是一款优秀的持久层框架,支持定制化SQL
,前身是iBatis
。
下面介绍在Spring Boot
中引入MyBatis
的使用。
2. 使用
2.1 pom.xml
通过Maven
引入MyBatis
。在Spring Boot
中,只要引入mybatis-spring-boot-starter
便可。
2.1.1 版本
<mybatis.version>1.3.2</mybatis.version>
<spring.boot.version>2.1.0.RELEASE</spring.boot.version>
<mysql.version>8.0.12</mysql.version>
<hutool.version>5.0.0</hutool.version>
<guava.version>28.1-jre</guava.version>
2.1.2 依赖
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
2.2 application.yml
mybatis.mapper-locations
配置*Mapper.xml
所在路径。
spring:
datasource:
url: jdbc:mysql://127.0.0.1:3306/spring-boot-demo?useUnicode=true&characterEncoding=UTF-8&useSSL=false&autoReconnect=true&failOverReadOnly=false&serverTimezone=GMT%2B8
username: root
password: root
driver-class-name: com.mysql.cj.jdbc.Driver
type: com.zaxxer.hikari.HikariDataSource
initialization-mode: always
continue-on-error: true
schema:
- "classpath:db/schema.sql"
data:
- "classpath:db/data.sql"
hikari:
minimum-idle: 5
connection-test-query: SELECT 1 FROM DUAL
maximum-pool-size: 20
auto-commit: true
idle-timeout: 30000
pool-name: SpringBootDemoHikariCP
max-lifetime: 60000
connection-timeout: 30000
logging:
level:
com.xkcoding: debug
com.xkcoding.orm.mybatis.mapper: trace
mybatis:
configuration:
# 下划线转驼峰
map-underscore-to-camel-case: true
mapper-locations: classpath:mappers/*.xml
type-aliases-package: com.xkcoding.orm.mybatis.entity
2.3 Application
启动类
@MapperScan
配置Mapper(DAO)接口所在包路径
@MapperScan(basePackages = {"com.xkcoding.orm.mybatis.mapper"})
@SpringBootApplication
public class SpringBootDemoOrmMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringBootDemoOrmMybatisApplication.class, args);
}
}
2.4 Entity
@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder
public class User implements Serializable {
private static final long serialVersionUID = -1840831686851699943L;
/**
* 主键
*/
private Long id;
/**
* 用户名
*/
private String name;
/**
* 加密后的密码
*/
private String password;
/**
* 加密使用的盐
*/
private String salt;
/**
* 邮箱
*/
private String email;
/**
* 手机号码
*/
private String phoneNumber;
/**
* 状态,-1:逻辑删除,0:禁用,1:启用
*/
private Integer status;
/**
* 创建时间
*/
private Date createTime;
/**
* 上次登录时间
*/
private Date lastLoginTime;
/**
* 上次更新时间
*/
private Date lastUpdateTime;
}
2.5 Mapper
Mapper
接口,也就是常说的DAO
接口。
在Mybatis
中也不用写接口的实现类。
接口上配置@Mapper
注解,配合@MapperScan
实现自动扫描。
可以直接通过@Select
指定SQL
,也可在*Mapper.xml
中定义SQL
。
@Mapper
@Component
public interface UserMapper {
/**
* 查询所有用户
*
* @return 用户列表
*/
@Select("SELECT * FROM orm_user")
List<User> selectAllUser();
/**
* 根据id查询用户
*
* @param id 主键id
* @return 当前id的用户,不存在则是 {@code null}
*/
@Select("SELECT * FROM orm_user WHERE id = #{id}")
User selectUserById(@Param("id") Long id);
/**
* 保存用户
*
* @param user 用户
* @return 成功 - {@code 1} 失败 - {@code 0}
*/
int saveUser(@Param("user") User user);
/**
* 删除用户
*
* @param id 主键id
* @return 成功 - {@code 1} 失败 - {@code 0}
*/
int deleteById(@Param("id") Long id);
}
2.6 Mapper.xml
通过namespace
与Mapper
接口关联。
通过id
可精确匹配Mapper
接口中的方法名。
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.xkcoding.orm.mybatis.mapper.UserMapper">
<insert id="saveUser">
INSERT INTO `orm_user` (`name`,
`password`,
`salt`,
`email`,
`phone_number`,
`status`,
`create_time`,
`last_login_time`,
`last_update_time`)
VALUES (#{user.name},
#{user.password},
#{user.salt},
#{user.email},
#{user.phoneNumber},
#{user.status},
#{user.createTime},
#{user.lastLoginTime},
#{user.lastUpdateTime})
</insert>
<delete id="deleteById">
DELETE
FROM `orm_user`
WHERE `id` = #{id}
</delete>
</mapper>
3. 测试
3.1 基类
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringBootDemoOrmMybatisApplicationTests {
@Test
public void contextLoads() {
}
}
3.2 UserMapperTest
public class UserMapperTest extends SpringBootDemoOrmMybatisApplicationTests {
@Autowired
private UserMapper userMapper;
/**
* 测试查询所有
*/
@Test
public void selectAllUser() {
List<User> userList = userMapper.selectAllUser();
Assert.assertTrue(CollUtil.isNotEmpty(userList));
log.debug("【userList】= {}", userList);
}
/**
* 测试根据主键查询单个
*/
@Test
public void selectUserById() {
User user = userMapper.selectUserById(1L);
Assert.assertNotNull(user);
log.debug("【user】= {}", user);
}
/**
* 测试保存
*/
@Test
public void saveUser() {
String salt = IdUtil.fastSimpleUUID();
User user = User.builder().name("testSave3").password(SecureUtil.md5("123456" + salt)).salt(salt).email("testSave3@xkcoding.com").phoneNumber("17300000003").status(1).lastLoginTime(new DateTime()).createTime(new DateTime()).lastUpdateTime(new DateTime()).build();
int i = userMapper.saveUser(user);
Assert.assertEquals(1, i);
}
/**
* 测试根据主键删除
*/
@Test
public void deleteById() {
int i = userMapper.deleteById(1L);
Assert.assertEquals(1, i);
}
}
4. 附录
4.1 schema.sql
DROP TABLE IF EXISTS `orm_user`;
CREATE TABLE `orm_user` (
`id` INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY COMMENT '主键',
`name` VARCHAR(32) NOT NULL UNIQUE COMMENT '用户名',
`password` VARCHAR(32) NOT NULL COMMENT '加密后的密码',
`salt` VARCHAR(32) NOT NULL COMMENT '加密使用的盐',
`email` VARCHAR(32) NOT NULL UNIQUE COMMENT '邮箱',
`phone_number` VARCHAR(15) NOT NULL UNIQUE COMMENT '手机号码',
`status` INT(2) NOT NULL DEFAULT 1 COMMENT '状态,-1:逻辑删除,0:禁用,1:启用',
`create_time` DATETIME NOT NULL DEFAULT NOW() COMMENT '创建时间',
`last_login_time` DATETIME DEFAULT NULL COMMENT '上次登录时间',
`last_update_time` DATETIME NOT NULL DEFAULT NOW() COMMENT '上次更新时间'
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Spring Boot Demo Orm 系列示例表';
4.2 data.sql
INSERT INTO `orm_user`(`id`,`name`,`password`,`salt`,`email`,`phone_number`) VALUES (1, 'user_1', 'ff342e862e7c3285cdc07e56d6b8973b', '412365a109674b2dbb1981ed561a4c70', 'user1@xkcoding.com', '17300000001');
INSERT INTO `orm_user`(`id`,`name`,`password`,`salt`,`email`,`phone_number`) VALUES (2, 'user_2', '6c6bf02c8d5d3d128f34b1700cb1e32c', 'fcbdd0e8a9404a5585ea4e01d0e4d7a0', 'user2@xkcoding.com', '17300000002');