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SpringBoot+Mybatis整合入门（一）
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SpringBoot+Mybatis 四步整合第一步 添加依赖
springBoot+Mybatis相关依赖
<!--springBoot相关-->
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
</parent> <!--约定版本-->
<properties>
<mybatis-spring-boot>1.2.0</mybatis-spring-boot>
<mysql-connector>5.1.39</mysql-connector>
</properties> <dependencies>
<!--springBoot相关-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <!--mybatis相关-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis-spring-boot}</version>
</dependency> <!--mysql驱动相关-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency> <!--pojo实用小插件-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<!--依赖不传递-->
<optional>true</optional>
</dependency>
</dependencies>
第二步 配置文件 （src/main/resources/application.yml）
server:
# 服务端口
port: 8081spring:
datasource:
url: jdbc:mysql://localhost:3306/springcloud-mybatis
username: root
password: 123456
driver-class-name: com.mysql.jdbc.Driver# Mybatis 配置
mybatis:
typeAliasesPackage: com.fame.entity
mapperLocations: classpath:mapper/*.xml# 打印sql
logging:
level:
# 配置mapper接口的包路径
com.fame.mapper : debug
第三步 创建Mybatis Mapper接口、Mapper.xml 以及 Entity
Mapper接口
public interface UserMapper {/**
* 用户列表查询
*
* @return 用户信息列表
*/
List<User> findAll();/**
* 新增用户信息
*
* @param user 用户信息
*/
void add(User user);/**
* 通过ID获取用户信息
*
* @param id 用户ID
* @return 用户信息
*/
User get(Long id);/**
* 修改用户信息
*
* @param user 用户信息
*/
void update(User user);/**
* 删除用户信息
*
* @param id 用户ID
*/
void delete(long id);
}
UserMapper.xml（src/main/resources/mapper/UserMapper.xml）
<?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.fame.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.fame.entity.User">
<id column="id" property="id" jdbcType="BIGINT"/>
<result column="age" property="age" jdbcType="INTEGER"/>
<result column="password" property="password" jdbcType="VARCHAR"/>
<result column="username" property="username" jdbcType="VARCHAR"/>
</resultMap> <sql id="Base_Column_List">
id, age, password, username
</sql>
<insert id="add" parameterType="com.fame.entity.User">
INSERT INTO sys_user(
<if test="id != null and id != '' ">id,</if>
<if test="age != null and age != ''">age,</if>
<if test="password != null and password != ''">password,</if>
<if test="username != null and username != ''">username</if>
)VALUES (
<if test="id != null and id != '' ">#{id},</if>
<if test="age != null and age != ''">#{age},</if>
<if test="password != null and password != ''">#{password},</if>
<if test="username != null and username != ''">#{username}</if>
)
</insert> <update id="update" parameterType="com.fame.entity.User">
UPDATE sys_user
<set>
<if test="age != null and age != '' ">age = #{age},</if>
<if test="password != null and password != ''">password = #{password},</if>
<if test="username != null and username != ''">username = #{username}</if>
</set>
WHERE id = #{id}
</update> <delete id="delete" parameterType="java.lang.Long">
DELETE FROM sys_user WHERE id = #{id}
</delete> <select id="findAll" resultMap="BaseResultMap" parameterType="com.fame.entity.User">
SELECT
<include refid="Base_Column_List"/>
FROM sys_user
</select> <select id="get" parameterType="java.lang.Long" resultMap="BaseResultMap">
SELECT
<include refid="Base_Column_List"/>
FROM sys_user
WHERE id = #{id}
</select></mapper>
Entity
@Data
// 开启链式编程
@Accessors(chain = true)
public class User implements Serializable {
private static final long serialVersionUID = -6510879035056033993L;private Long id;
private Integer age;
private String password;
private String username;
}
第四步 创建Application启动类
如果是直接创建springboot项目可忽略这一步，我是直接创建的一个Maven项目进行整合。
注意:加入注解@MapperScan进行mapper接口扫描
@SpringBootApplication
// mapper 接口类扫描包配置
@MapperScan("com.fame.mapper")
public class MybatisApplication {
public static void main(String[] args) {
SpringApplication.run(MybatisApplication.class, args);
}
}
这样就整合完成，可以创建接口进行单元测试了
UserController
@RequestMapping("/user")
@RestController
public class UserController {@Autowired
private UserMapper userMapper;/**
* 查询用户列表
*/
@GetMapping("/list")
public List<User> list() {
List<User> userList = userMapper.findAll();
System.out.println(userList);
return userList;
}/**
* 通过ID获取用户信息
*/
@GetMapping("/get")
public User get() {
return userMapper.get(8L);
}/**
* 新增用户信息
*/
@PostMapping("/add")
public void add() {
User user = new User().setUsername("大白一号").setPassword("dabaiyihao").setAge(22);
userMapper.add(user);
}/**
* 修改用户信息
*/
@PutMapping("/update")
public void update() {
User user = userMapper.get(1L);
user.setUsername("大白修改操作");
userMapper.update(user);
} /**
* 删除用户信息
*/
@DeleteMapping("/delete")
public void delete() {
userMapper.delete(9L);
}}
