九、spring boot 2.x 整合 mybatis

1、在pom.xml中添加mysql和mybatis 的maven依赖

<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.3.2</version>
</dependency>

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

2、在src/main/resources 目录下创建mybatis目录，并在下面创建mybatis-config.xml，同时创建一个mapper目录，用于存放sql映射文件

mybatis-config.xml 内容如下：

<?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>

3、在application.properties中添加数据库连接信息和 mybatis配置信息

#mysql
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/boot_v2?useUnicode=true&characterEncoding=utf8&characterSetResults=utf8&useSSL=false
spring.datasource.username=root
spring.datasource.password=root

#mybatis
#扫描指定路径下的实体，并用实体的简单名称作为别名
mybatis.type-aliases-package=com.ldy.bootv2.demo.entity
#自动扫描加载mybatis配置文件
mybatis.config-location=classpath:mybatis/mybatis-config.xml
#自动扫描加载Sql映射文件
mybatis.mapper-locations=classpath:mybatis/mapper/*.xml
#mapper目录下分多个模块时可以这样写
#mybatis.mapper-locations=classpath:mybatis/mapper/*/*.xml

4、创建数据库表

CREATE TABLE `user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `age` int(11) DEFAULT NULL,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=3 DEFAULT CHARSET=utf8;

INSERT INTO `user` VALUES ('1', '20', 'zs'), ('2', '21', 'ls');

5、编写数据库表对应实体类：UserEntity.java

package com.ldy.bootv2.demo.entity;

import java.io.Serializable;

import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;

@ApiModel
public class UserEntity implements Serializable {

	private static final long serialVersionUID = 1L;

        @ApiModelProperty(value="id，新建时不传，修改时传")
	private Integer id;
	
	@ApiModelProperty(value="名称")
	private String userName;
	
	@ApiModelProperty(value="年龄")
	private Integer userAge;

	public Integer getId() {
		return id;
	}

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

	public String getUserName() {
		return userName;
	}

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

	public Integer getUserAge() {
		return userAge;
	}

	public void setUserAge(Integer userAge) {
		this.userAge = userAge;
	}
}

6、编写Dao层代码：UserMapper.java

package com.ldy.bootv2.demo.mapper;

import java.util.List;

import org.apache.ibatis.annotations.Mapper;

import com.ldy.bootv2.demo.entity.UserEntity;

@Mapper
public interface UserMapper {

    List<UserEntity> getAll();

    UserEntity getOne(Integer id);
    
    int insert(UserEntity user);

    int update(UserEntity user);

    int delete(Integer id);
}

7、编写Controller：UserController

package com.ldy.bootv2.demo.controller;

import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.ldy.bootv2.demo.entity.UserEntity;
import com.ldy.bootv2.demo.mapper.UserMapper;

import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import io.swagger.annotations.ApiParam;

@Api(tags = "用户信息管理接口-API")
@RestController
@RequestMapping("/user")
public class UserController {

	private static Logger logger = LoggerFactory.getLogger(UserController.class);

	@Autowired
	UserMapper userMapper;

	@GetMapping("/findAll")
	@ApiOperation("查询全部用户")
	public List<UserEntity> findAll() {
		logger.info("您调用了findAll接口");
		return userMapper.getAll();
	}

	@GetMapping("/getOne/{id}")
	@ApiOperation("根据ID查询用户")
	public UserEntity getOne(@ApiParam(value="用户id",required=true) @PathVariable("id") Integer id) {
		logger.info("您调用了getOne接口");
		return userMapper.getOne(id);
	}

	@PutMapping("/saveOrUpdate")
	@ApiOperation("新增或者修改用户")
	public String saveOrUpdate(@ModelAttribute UserEntity entity) {
		logger.info("您调用了saveOrUpdate接口");
		try {
			if(null == entity.getId()) {
				userMapper.insert(entity);
			}else {
				userMapper.update(entity);
			}
			
		} catch (Exception e) {
			logger.error("失败，原因：" + e.getMessage());
			return "error";
		}
		return "success";
	}

	@DeleteMapping("/delete/{id}")
	@ApiOperation("根据ID删除用户")
	public String deleteById(@ApiParam(value="用户id",required=true) @PathVariable("id") Integer id) {
		logger.info("您调用了delete接口");
		try {
			userMapper.delete(id);
		} catch (Exception e) {
			logger.error("失败，原因：" + e.getMessage());
			return "error";
		}
		return "success";
	}

}

8、运行项目，打开swagger页面，测试接口正常，swagger的集成请查看：https://blog.csdn.net/LDY1016/article/details/83415640

源码下载地址：https://pan.baidu.com/s/1Z771VDiuabDBJJV445xLeA#list/path=%2Fspring%20boot%202.x%20%E4%BB%A3%E7%A0%81

九、spring boot 2.x 整合 mybatis

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