简介

Mybaits是经常用到的持久化框架,这次用SpringBoot来整合使用Mybatis。

依赖

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<dependencies>
<!--Mybatis场景启动器-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.1.1</version>
</dependency>
<!--web场景启动器-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--MySQL驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--单元测试-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
<!--Druid-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.1</version>
</dependency>
<!--log4j日志-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

定义实体类

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package com.yww.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;


@Data
@NoArgsConstructor
@AllArgsConstructor //使用lombok偷懒
public class User {
int ID;
String name;
}

定义Mapper接口

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package com.yww.mapper;
import com.yww.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;
import java.util.List;

@Mapper
@Repository
public interface UserMapper {
List<User> selectUserList();
User selectUserByID(int ID);
int addUser(User user);
int updateUser(User user);
int deleteUser(int id);
}

创建Mybatis配置文件

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<?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">
<!--绑定mapper接口,位置要写对-->
<mapper namespace="com.yww.mapper.UserMapper">
<select id="selectUserList" resultType="User">
SELECT * FROM user
</select>

<select id="selectUserByID" resultType="User">
SELECT * FROM user WHERE ID = #{ID}
</select>

<insert id="addUser" parameterType="User">
INSERT INTO user (ID,name) VALUES (#{ID},#{name})
</insert>

<update id="updateUser" parameterType="User">
UPDATE user SET name=#{name} WHERE ID = #{ID}
</update>

<delete id="deleteUser" parameterType="int">
DELETE FROM user WHERE ID=#{ID}
</delete>
</mapper>

配置SpringBoot配置文件

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# application.yml使用
# 连接数据库
spring:
datasource:
username: root
password: password
url: jdbc:mysql://localhost:3306/test?userUnicode=true&characterEncoding=utf-8&serverTimezone=UTC
driver-class-name: com.mysql.cj.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
# Druid的配置
initialSize: 5
minIdle: 5
maxActive: 20
max-wait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
# mybatis设置
mybatis:
type-aliases-package: com.yww.pojo #绑定实体类,不然配置文件识别不出User
mapper-locations: classpath:mybatis/mapper/*.xml #绑定mybatis的配置文件

编写controller

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package com.yww.controller;

import com.yww.mapper.UserMapper;
import com.yww.pojo.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
@GetMapping("/select")
public List<User> selectUserList(){
List<User> list = userMapper.selectUserList();
return list;
}
@GetMapping("/selectbyid")
public User selectByID(){
User user = userMapper.selectUserByID(1);
return user;
}
@GetMapping("/insert")
public int addUser(){
User user = new User(3, "王五");
return userMapper.addUser(user);
}
@GetMapping("/update")
public int updateUser(){
User user = new User(3, "赵六");
return userMapper.updateUser(user);
}
@GetMapping("/delete")
public int deleteUser(){
return userMapper.deleteUser(3);
}
}