Spring boot 整合 Mybatis 实现增删改查(MyEclipse版)

1、首先搭建好一个Spring boot 程序，编写好启动类。

启动类代码如下：

@SpringBootApplication
public class Start {
	public static void main(String[] args) {
		SpringApplication.run(Start.class, "--server.port=9999");//后面是直接设置端口号
	}
}

2、要整合mybatis需要引进依赖，顺便把热部署依赖也加上去，代码如下

<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.6.RELEASE</version>
		<relativePath />
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<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>
		<!-- 热部署 -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<optional>true</optional>
		</dependency>
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<!-- 热部署 -->
				<configuration>
					<fork>true</fork>
				</configuration>
			</plugin>
		</plugins>
	</build>

　　3、依赖包下载完之后，添加配置文件application.properties内容如下：

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

　　把它直接放到src/main/resources这个目录下就可以了。

4、加点mybatis配置文件mybatis-config.xml，代码如下

<?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>
	<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>

　5、接下来就可以写实例，代码如下；

UserEntity.java

package root.entity;

import java.io.Serializable;

import root.enums.UserSexEnum;

public class UserEntity implements Serializable {

	private static final long serialVersionUID = 1L;
	private Long id;
	private String userName;
	private String passWord;
	private UserSexEnum userSex;
	private String nickName;

	public UserEntity() {
		super();
	}

	public UserEntity(String userName, String passWord, UserSexEnum userSex) {
		super();
		this.passWord = passWord;
		this.userName = userName;
		this.userSex = userSex;
	}

	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public String getUserName() {
		return userName;
	}

	public void setUserName(String userName) {
		this.userName = userName;
	}

	public String getPassWord() {
		return passWord;
	}

	public void setPassWord(String passWord) {
		this.passWord = passWord;
	}

	public UserSexEnum getUserSex() {
		return userSex;
	}

	public void setUserSex(UserSexEnum userSex) {
		this.userSex = userSex;
	}

	public String getNickName() {
		return nickName;
	}

	public void setNickName(String nickName) {
		this.nickName = nickName;
	}

	@Override
	public String toString() {
		// TODO Auto-generated method stub
		return "userName " + this.userName + ", pasword " + this.passWord + "sex " + userSex.name();
	}

}

　　UserMapper.java

package root.mapper;

import java.util.List;

import root.entity.UserEntity;

public interface UserMapper {
	
	List<UserEntity> getAll();
	
	UserEntity getOne(Long id);

	void insert(UserEntity user);

	void update(UserEntity user);

	void delete(Long id);

}

　　他对应的xml文件代码如下：

<?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="root.mapper.UserMapper" >
    <resultMap id="BaseResultMap" type="root.entity.UserEntity" >
        <id column="id" property="id" jdbcType="BIGINT" />
        <result column="userName" property="userName" jdbcType="VARCHAR" />
        <result column="passWord" property="passWord" jdbcType="VARCHAR" />
        <result column="user_sex" property="userSex" javaType="root.enums.UserSexEnum"/>
        <result column="nick_name" property="nickName" jdbcType="VARCHAR" />
    </resultMap>
    
    <sql id="Base_Column_List" >
        id, userName, passWord, user_sex, nick_name
    </sql>

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

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

    <insert id="insert" parameterType="root.entity.UserEntity" >
       INSERT INTO 
       		users
       		(userName,passWord,user_sex) 
       	VALUES
       		(#{userName}, #{passWord}, #{userSex})
    </insert>
    
    <update id="update" parameterType="root.entity.UserEntity" >
       UPDATE 
       		users 
       SET 
       	<if test="userName != null">userName = #{userName},</if>
       	<if test="passWord != null">passWord = #{passWord},</if>
       	nick_name = #{nickName}
       WHERE 
       		id = #{id}
    </update>
    
    <delete id="delete" parameterType="java.lang.Long" >
       DELETE FROM
       		 users 
       WHERE 
       		 id =#{id}
    </delete>

</mapper>

　　UserSexEnum.java

public enum UserSexEnum {
	MAN, WOMAN
}

　　UserController.java

package root.controller;

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 root.entity.UserEntity;
import root.mapper.UserMapper;

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

6、最后在启动类里面加上@MapperScan("root.mapper")扫描进来

7、我的工程目录结构如下：

到这里一个简单的spring boot整合mybatis访问数据库实现增删改就好了