springboot集成mybatis

关键代码如下：

1，添加pom引用

	<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>
	    </dependency>

2 application.properties

mybatis.config-locations=classpath:mybatis/mybatis-config.xml
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
mybatis.type-aliases-package=com.kerry.model

spring.datasource.driverClassName = com.mysql.jdbc.Driver
spring.datasource.url = jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8
spring.datasource.username = root
spring.datasource.password = 123456

3 在resource目录下创建mybatis目录并创建mybatis-config.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<settings>
		<setting name="callSettersOnNulls" value="true"/>
		
		<setting name="cacheEnabled" value="true"/>
		
		<setting name="lazyLoadingEnabled" value="true"/>
		
		<setting name="aggressiveLazyLoading" value="true"/>
		
		<setting name="multipleResultSetsEnabled" value="true"/>
		
		<setting name="useColumnLabel" value="true"/>
		
		<setting name="useGeneratedKeys" value="false"/>
		
		<setting name="autoMappingBehavior" value="PARTIAL"/>
		
		<setting name="defaultExecutorType" value="SIMPLE"/>
		
		<setting name="mapUnderscoreToCamelCase" value="true"/>
		
        <setting name="localCacheScope" value="SESSION"/>
		
        <setting name="jdbcTypeForNull" value="NULL"/>
		
	</settings>

	<typeAliases>
		<typeAlias alias="Integer" type="java.lang.Integer" />
		<typeAlias alias="Long" type="java.lang.Long" />
		<typeAlias alias="HashMap" type="java.util.HashMap" />
		<typeAlias alias="LinkedHashMap" type="java.util.LinkedHashMap" />
		<typeAlias alias="ArrayList" type="java.util.ArrayList" />
		<typeAlias alias="LinkedList" type="java.util.LinkedList" />
	</typeAliases>
</configuration>

mybatis目录下创建mapper目录存放mapper类接口文件

package com.kerry.mapper;

import java.util.List;

import com.kerry.model.User;

public interface UserMapper {
	
	List<User> getAll();
	
	User getOne(Integer id);

	void insert(User user);

	void update(User user);

	void delete(Integer id);

}

model类文件

package com.kerry.mapper;

import java.util.List;

import com.kerry.model.User;

public interface UserMapper {
	
	List<User> getAll();
	
	User getOne(Integer id);

	void insert(User user);

	void update(User user);

	void delete(Integer id);

}

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.kerry.mapper.UserMapper" >
    <resultMap id="BaseResultMap" type="com.kerry.model.User" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="name" property="name" jdbcType="VARCHAR" />
        <result column="age" property="age" jdbcType="VARCHAR" />
        <result column="address" property="address" jdbcType="VARCHAR"/>
    </resultMap>
    
    <sql id="Base_Column_List" >
        id, name, age, address
    </sql>

    <select id="getAll" resultMap="BaseResultMap"  >
       SELECT 
       <include refid="Base_Column_List" />
	   FROM user
    </select>

    <select id="getOne" parameterType="java.lang.Integer" resultMap="BaseResultMap" >
        SELECT 
       <include refid="Base_Column_List" />
	   FROM user
	   WHERE id = #{id}
    </select>

    <insert id="insert" parameterType="com.kerry.model.User" >
       INSERT INTO 
       		user
       		(id,name,age,address) 
       	VALUES
       		(#{id},#{name}, #{age}, #{address})
    </insert>
    
    <update id="update" parameterType="com.kerry.model.User" >
       UPDATE 
       		user 
       SET 
       	<if test="name != null">name = #{name},</if>
       	<if test="age != null">age = #{age},</if>
       	address = #{address}
       WHERE 
       		id = #{id}
    </update>
    
    <delete id="delete" parameterType="java.lang.Integer" >
       DELETE FROM
       		 user 
       WHERE 
       		 id =#{id}
    </delete>

</mapper>

controller：

package com.kerry.web;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.kerry.model.User;
import com.kerry.mapper.UserMapper;

@RestController
public class UserController {
	
	@Autowired
	private UserMapper userMapper;
	
	@RequestMapping("/getUsers")
	public List<User> getUsers() {
		List<User> users=userMapper.getAll();
		return users;
	}
	
    @RequestMapping("/getUser")
    public User getUser(Integer id) {
    	User user=userMapper.getOne(id);
        return user;
    }
    
    @RequestMapping("/add")
    public void save(User user) {
    	userMapper.insert(user);
    }
    
    @RequestMapping(value="update")
    public void update(User user) {
    	userMapper.update(user);
    }
    
    @RequestMapping(value="/delete/{id}")
    public void delete(@PathVariable("id") Integer id) {
    	userMapper.delete(id);
    }
    
    
}

最后在启动类上加上 扫描maper interface注解

@SpringBootApplication
@MapperScan("com.kerry.mapper")
public class Application {

	public static void main(String[] args) {
		SpringApplication.run(Application.class, args);
	}
}

或者在每个XXMapper类上加上@mapper注解也行  二选一即可

比如

package com.kerry.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;

import com.kerry.model.User;

@Mapper
public interface UserMapper {
	
	List<User> getAll();
	
	User getOne(Integer id);

	void insert(User user);

	void update(User user);

	void delete(Integer id);

}

个人建议使用直接在启动类上application上@MapperScan方便，一次搞定，不必每写一个mapper类都加上@mapper注解

附上项目结构目录 选中的类以及文件