Spring Boot入门(第三课,连接数据库)
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2022-04-05 08:04:55
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关键配置:启动类必须加上mapper扫描位置,@MapperScan("com.jbz.jbzspringboot.mapper")
package com.jbz.jbzspringboot;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
@SpringBootApplication
@ServletComponentScan
@MapperScan("com.jbz.jbzspringboot.mapper")
public class JbzSpringbootApplication {
public static void main(String[] args) {
SpringApplication.run(JbzSpringbootApplication.class, args);
System.out.println("启动成功");
}
}
application.properties配置加上:
#指出xml位置
mybatis.mapperLocations=classpath:mapper/*.xml
maven引入依赖包
<!-- 引入mybatis starter-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
<!--<scope>runtime</scope>-->
</dependency>
<!-- MySQL的JDBC驱动包 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!-- 引入第三方数据源 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.6</version>
</dependency>
controller:
package com.jbz.jbzspringboot.controller;
import com.jbz.jbzspringboot.entity.User;
import com.jbz.jbzspringboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
/**
* @author mingjian xu
* @date 2018-08-03
* @describe 解释用途
*/
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("add")
public int addUser(){
User user = new User(22, "xmj", "pm", "1qaz2wsx","2018-07-31 23:00:00");
int id = userService.add(user);
return id;
}
@RequestMapping("select")
public Object selectAll(){
return userService.selectAll();
}
}
service
package com.jbz.jbzspringboot.service;
import com.jbz.jbzspringboot.entity.User;
import java.util.List;
/**
* @author mingjian xu
* @date 2018-08-03
* @describe 解释用途
*/
public interface UserService {
int add(User user);
List<User> selectAll();
}
serviceimpl
package com.jbz.jbzspringboot.service.impl;
import com.jbz.jbzspringboot.entity.User;
import com.jbz.jbzspringboot.mapper.user.UserMapper;
import com.jbz.jbzspringboot.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* @author mingjian xu
* @date 2018-08-03
* @describe 解释用途
*/
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper mapper;
@Override
public int add(User user) {
mapper.insert(user);
return user.getId();
}
@Override
public List<User> selectAll() {
return mapper.selectAll();
}
}
mapper
package com.jbz.jbzspringboot.mapper.user;
import com.jbz.jbzspringboot.entity.User;
import java.util.List;
/**
* @author mingjian xu
* @date 2018-08-03
* @describe 解释用途
*/
public interface UserMapper {
/**
* 保存用户
* @param user
* @return
*/
int insert(User user);
/**
* 查询用户
* @return
*/
List<User> selectAll();
}
xml配置:
<?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.jbz.jbzspringboot.mapper.user.UserMapper">
<select id="selectAll" resultType="com.jbz.jbzspringboot.entity.User">
select * from user;
</select>
<insert id="insert" useGeneratedKeys="true" keyProperty="id" parameterType="com.jbz.jbzspringboot.entity.User">
insert into user (`age`,`name`,`desc`,`password`,`createtime`) values (#{age},#{name},#{desc},#{password},#{createTime})
</insert>
</mapper>
项目结构图
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