springboot（二）连接mysql

落日映苍穹つ 2022-05-20 20:06 153阅读 0赞

*  添加依赖

<dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-jdbc</artifactId>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.0</version>
            </dependency>

*  数据库配置文件

# 数据库配置
    spring:
      datasource:
        url: jdbc:mysql://127.0.0.1:3306/springboot
        password: *****
        username: root
        driver-class-name: com.mysql.jdbc.Driver

*  在数据中建一张表，插入几条数据
 *  实体类

public class Account {
        private int id;
        private String name;
    
        public int getId() {
            return id;
        }
    
        public void setId(int id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public double getMoney() {
            return money;
        }
    
        public void setMoney(double money) {
            this.money = money;
        }
    
        private double money;
    }

*  controller，mapper，service

@Service
    public class AccountService { 
    
        @Autowired
        private AccountMapper accountMapper;
    
        public Account findAccount(int id){
            return accountMapper.findAccount(id);
        }
    }
    @Mapper
    public interface AccountMapper { 
        @Select("select id, name as name, money as money from account where id = #{id}")
        Account findAccount(@Param("id") int id);
    }
    @RequestMapping("find")
        public Account find(int id){
            return accountService.findAccount(id);
        }

*  浏览器访问[http://localhost:8080/find?id=2][http_localhost_8080_find_id_2]

> 出现结果：\{“id”:2,”name”:”bbb”,”money”:1000.0\}

[http_localhost_8080_find_id_2]: http://localhost:8080/find?id=2