SpringCloud（第 043 篇）链接Mysql

超、凢脫俗 2022-06-05 12:52 113阅读 0赞

# http://blog.csdn.net/ylimh\_hmily/article/details/78287373 #

## 一、大致介绍 ##

1、访问数据库，自然少不了一些持久化框架，而我本身也是Mybatis框架的支持者；
    2、Mybatis是那种专注于sql的框架，对象映射以及输入输出都是由框架自动完成；
    3、因此本章节就简单小试牛刀尝试下如何使用Mybatis持久化框架进行对数据的操作；
      
       
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## 二、实现步骤 ##

### 2.1 添加 maven 引用包 ###

<?xml version="1.0" encoding="UTF-8"?>
    <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <artifactId>springms-provider-user-mysql-mybatis</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <parent>
            <groupId>com.springms.cloud</groupId>
            <artifactId>springms-spring-cloud</artifactId>
            <version>1.0-SNAPSHOT</version>
        </parent>
    
        <dependencies>
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-data-jpa</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
            </dependency>
    
            
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.1</version>
            </dependency>
        </dependencies>
    
    </project>
      
       
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### 2.2 添加应用配置文件（springms-provider-user-mysql-mybatis\\src\\main\\resources\\application.yml） ###

server:
      port: 8325
    spring:
      application:
        name: springms-provider-user-mysql-mybatis  #全部小写
    
    
    ##################################################################################################### # mysql 属性配置 datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://ip:3306/hmilyylimh username: username password: password # jpa: # hibernate: # #ddl-auto: create #ddl-auto:设为create表示每次都重新建表 # ddl-auto: update #ddl-auto:设为update表示每次都不会重新建表 # show-sql: true #####################################################################################################
    
    
    ##################################################################################################### # 打印日志 logging: level: root: INFO org.hibernate: INFO org.hibernate.type.descriptor.sql.BasicBinder: TRACE org.hibernate.type.descriptor.sql.BasicExtractor: TRACE com.springms: DEBUG #####################################################################################################
    
    
      
       
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### 2.3 添加实体用户类User（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/entity/User.java） ###

package com.springms.cloud.entity;
    
    
    import javax.persistence.*;
    
    /** * * Mybatis 需要加上这些注解才可以使用，不然启动都会报错； * */
    @Entity
    public class User { 
      @Id
      @GeneratedValue(strategy = GenerationType.AUTO)
      private Long id;
    
      @Column
      private String username;
    
      @Column
      private String name;
    
      @Column
      private Integer age;
    
      @Column
      private String balance;
    
      public Long getId() {
        return this.id;
      }
    
      public void setId(Long id) {
        this.id = id;
      }
    
      public String getUsername() {
        return this.username;
      }
    
      public void setUsername(String username) {
        this.username = username;
      }
    
      public String getName() {
        return this.name;
      }
    
      public void setName(String name) {
        this.name = name;
      }
    
      public Integer getAge() {
        return this.age;
      }
    
      public void setAge(Integer age) {
        this.age = age;
      }
    
      public String getBalance() {
        return this.balance;
      }
    
      public void setBalance(String balance) {
        this.balance = balance;
      }
    }
    
      
       
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### 2.4 添加用户mapper接口（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/mapper/IUserMapper.java） ###

package com.springms.cloud.mapper;
    
    import com.springms.cloud.entity.User;
    import org.apache.ibatis.annotations.Insert;
    import org.apache.ibatis.annotations.Select;
    
    import java.util.List;
    
    /** * 用户 mybatis 映射文件。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017-10-19 * */
    public interface IUserMapper { 
    
        @Select("select * from user where id = #{id}")
        User findUserById(Long id);
    
        @Select("select * from user")
        List<User> findAllUsers();
    
        @Insert("INSERT INTO user(username, name, age, balance) VALUES(#{username}, #{name}, #{age}, #{balance})")
        int insertUser(User user);
    }
      
       
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### 2.5 添加用户mapper接口实现类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/mapper/user/UserMapper.java） ###

package com.springms.cloud.mapper.user;
    
    /** * * * @author hmilyylimh * * @version 0.0.1 * * @date 2017-10-19 * */
    public class UserMapper { 
    }
    
      
       
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### 2.6 添加用户Service接口类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/service/IUserService.java） ###

package com.springms.cloud.service;
    
    import com.springms.cloud.entity.User;
    
    import java.util.List;
    
    /** * 简单用户链接Mysql数据库微服务（通过@Service注解标注该类为持久化操作对象）。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017-10-19 * */
    public interface IUserService { 
    
        User findUserById(Long id);
    
        List<User> findAllUsers();
    
        int insertUser(User user);
    }
    
      
       
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### 2.7 添加用户Service接口实现类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/service/impl/UserServiceImpl.java） ###

package com.springms.cloud.service.impl;
    
    import com.springms.cloud.entity.User;
    import com.springms.cloud.mapper.IUserMapper;
    import com.springms.cloud.service.IUserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.util.List;
    
    /** * 简单用户链接Mysql数据库微服务（通过@Service注解标注该类为持久化操作对象）。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017-10-19 * */
    @Service
    public class UserServiceImpl implements IUserService { 
    
        @Autowired
        IUserMapper iUserMapper;
    
        @Override
        public User findUserById(Long id) {
            return iUserMapper.findUserById(id);
        }
    
        @Override
        public List<User> findAllUsers() {
            return iUserMapper.findAllUsers();
        }
    
        @Override
        public int insertUser(User user) {
            return iUserMapper.insertUser(user);
        }
    }
      
       
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### 2.8 添加用户Web访问层Controller（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/controller/ProviderUserMysqlMybatisController.java） ###

package com.springms.cloud.controller;
    
    import com.springms.cloud.entity.User;
    import com.springms.cloud.service.IUserService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.*;
    
    import java.util.List;
    
    /** * 用户微服务Controller。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017-10-19 * */
    @RestController
    public class ProviderUserMysqlMybatisController { 
    
        @Autowired
        private IUserService iUserService;
    
        @GetMapping("/simple/{id}")
        public User findUserById(@PathVariable Long id) {
            return this.iUserService.findUserById(id);
        }
    
        @GetMapping("/simple/list")
        public List<User> findUserList() {
            return this.iUserService.findAllUsers();
        }
    
        /** * 添加一个student,使用postMapping接收post请求 * * http://localhost:8310/simple/addUser?username=user11&age=11&balance=11 * * @return */
        @PostMapping("/simple/addUser")
        public User addUser(@RequestParam(value = "username", required=false) String username, @RequestParam(value = "age", required=false) Integer age, @RequestParam(value = "balance", required=false) String balance){
            User user=new User();
    
            user.setUsername(username);
            user.setName(username);
            user.setAge(age);
            user.setBalance(balance);
    
            int result = iUserService.insertUser(user);
            if(result > 0){
                return user;
            }
    
            user.setId(0L);
            user.setName(null);
            user.setUsername(null);
            user.setBalance(null);
            return user;
        }
    }
    
      
       
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### 2.9 添加微服务启动类（springms-provider-user-mysql-mybatis/src/main/java/com/springms/cloud/MsProviderUserMysqlMybatisApplication.java） ###

package com.springms.cloud;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    /** * 链接Mysql数据库简单的集成Mybatis框架访问数据库。 * * @author hmilyylimh * * @version 0.0.1 * * @date 2017-10-19 * */
    @SpringBootApplication
    @MapperScan("com.springms.cloud.mapper.**")
    public class MsProviderUserMysqlMybatisApplication { 
    
        public static void main(String[] args) {
            SpringApplication.run(MsProviderUserMysqlMybatisApplication.class, args);
            System.out.println("【【【【【【 链接MysqlMybatis数据库微服务 】】】】】】已启动.");
        }
    }
    
      
       
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## 三、测试 ##

/****************************************************************************************
     注意：Mybatis 需要加上 entity 等注解才可以使用，不然启动都会报错；
     @MapperScan("com.springms.cloud.mapper.**") 或者在每个 Mapper 接口文件上添加 @Mapper 也可以；
    
     一、简单用户链接Mysql数据库微服务（通过 mybatis 链接 mysql 编写数据访问）：
    
     1、启动 springms-provider-user-mysql-mybatis 模块服务，启动1个端口；
     2、在浏览器输入地址 http://localhost:8325/simple/10 可以看到用户ID=10的信息成功的被打印出来；
    
     3、使用 IDEA 自带工具 Test Restful WebService 发送 HTTP POST 请求,并添加 username、age、balance三个参数，然后执行请求，并去 mysql 数据库查看数据是否存在，正常情况下 mysql 数据库刚刚插入的数据成功了:
     4、使用 REST Client 执行 "/simple/list" 接口，也正常将 mysql 数据库中所有的用户信息打印出来了；
     ****************************************************************************************/
    
      
       
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## 四、下载地址 ##

[https://git.oschina.net/ylimhhmily/SpringCloudTutorial.git][https_git.oschina.net_ylimhhmily_SpringCloudTutorial.git]

[https_git.oschina.net_ylimhhmily_SpringCloudTutorial.git]: https://git.oschina.net/ylimhhmily/SpringCloudTutorial.git