SpringBoot整合MyBatis
作者：互联网
SpringBoot整合MyBatis
系统要求
Java 8+
springBoot2.5 +
创建springBoot项目工程
导入依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.6</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--Druid starter-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.22</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
项目结构目录
配置application.yaml
spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3307/webapp1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
username: webapp1
password: webapp1
type: com.alibaba.druid.pool.DruidDataSource
#Spring Boot 默认是不注入这些属性值的，需要自己绑定
#druid 数据源专有配置
# 初始化大小，最小，最大
initialSize: 5
minIdle: 5
maxActive: 200
# 配置获取连接等待超时的时间
maxWait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
minEvictableIdleTimeMillis: 300000
# 用来检测连接是否有效的sql，要求是一个查询语句
validationQuery: SELECT 1 FROM DUAL
# 建议配置为true，不影响性能，并且保证安全性。申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。
testWhileIdle: true
# 申请连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能
testOnBorrow: false
# 归还连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。
testOnReturn: false
# 是否缓存preparedStatement，也就是PSCache。PSCache对支持游标的数据库性能提升巨大，比如说oracle。在mysql下建议关闭。
poolPreparedStatements: true
# 要启用PSCache，必须配置大于0，当大于0时，poolPreparedStatements自动触发修改为true。
max-pool-prepared-statement-per-connection-size: 50
#配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
#如果允许时报错 java.lang.ClassNotFoundException: org.apache.log4j.Priority
#则导入 log4j 依赖即可，Maven 地址：https://mvnrepository.com/artifact/log4j/log4j
filters: stat,wall,log4j
# 合并多个DruidDataSource的监控数据
useGlobalDataSourceStat: true
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
mybatis:
#sql映射文件的位置
# mapper-locations: classpath:com/xiang/mapper/*.xml
mapper-locations: classpath:mapper/*.xml
#开启驼峰命名转化
configuration:
map-underscore-to-camel-case: true
#开启别名
type-aliases-package: com.xiang
创建User类
package com.xiang.pojo;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.springframework.stereotype.Component;
import java.util.Date;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/17 23:52
*/
@Component
@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {
private int id;
private String username;
private String age;
private Date birthday;
}
创建UserMapper
package com.xiang.mapper;
import com.xiang.pojo.User;
import org.apache.ibatis.annotations.Mapper;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/17 23:54
*/
@Mapper
@Repository
public interface UserMapper {
User findById(int id);
List<User> findAll();
}
创建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.xiang.mapper.UserMapper">
<select id="findById" resultType="user">
select * from user where id = #{id}
</select>
<select id="findAll" resultType="user">
select * from user
</select>
</mapper>
创建UserService
package com.xiang.service;
import com.xiang.pojo.User;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/18 15:01
*/
public interface UserService {
User findById(int id);
List<User> findAll();
}
创建UserServiceImpl
package com.xiang.service.impl;
import com.xiang.mapper.UserMapper;
import com.xiang.pojo.User;
import com.xiang.service.UserService;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/18 15:02
*/
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public User findById(int id) {
return userMapper.findById(id);
}
@Override
public List<User> findAll() {
return userMapper.findAll();
}
}
运行测试
package com.xiang;
import com.alibaba.druid.pool.DruidDataSource;
import com.xiang.pojo.User;
import com.xiang.service.impl.UserServiceImpl;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.jdbc.core.JdbcTemplate;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
@SpringBootTest
class SpringBootDatabaseApplicationTests {
@Autowired
UserServiceImpl userService;
/***
* 根据id查
*/
@Test
public void findById(){
User user = userService.findById(1);
System.out.println(user);
}
/**
* 查所有
*/
@Test
public void findAll(){
System.out.println(userService.findAll());
System.out.println("/*******************************************/");
List<User> userList = userService.findAll();
for (User user : userList) {
System.out.println(user);
}
}
}
测试运行结果
创建UserController
package com.xiang.controller;
import com.xiang.pojo.User;
import com.xiang.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/18 22:03
*/
@Controller
public class UserController {
@Autowired
UserService userService;
@RequestMapping("findById")
@ResponseBody
public String findById(@RequestParam("id") int id) {
User byId = userService.findById(id);
return byId.toString();
}
}
前端运行结果
标签：SpringBoot,springframework,User,整合,org,MyBatis,import,xiang,com 来源： https://www.cnblogs.com/d534/p/15422641.html