SpringCloud(第 043 篇)链接Mysql数据库简单的集成Mybatis框架访问数据库

SpringCloud(第 043 篇)链接Mysql数据库简单的集成Mybatis框架访问数据库

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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;

二、实现步骤

2.1 添加 maven 引用包


<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>4.0.0modelVersion>

    <artifactId>springms-provider-user-mysql-mybatisartifactId>
    <version>1.0-SNAPSHOTversion>
    <packaging>jarpackaging>

    <parent>
        <groupId>com.springms.cloudgroupId>
        <artifactId>springms-spring-cloudartifactId>
        <version>1.0-SNAPSHOTversion>
    parent>

    <dependencies>
        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-data-jpaartifactId>
        dependency>

        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>

        
        <dependency>
            <groupId>mysqlgroupId>
            <artifactId>mysql-connector-javaartifactId>
        dependency>

        
        <dependency>
            <groupId>org.mybatis.spring.bootgroupId>
            <artifactId>mybatis-spring-boot-starterartifactId>
            <version>1.3.1version>
        dependency>
    dependencies>

project>

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
#####################################################################################################

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;
  }
}

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 findAllUsers();

    @Insert("INSERT INTO user(username, name, age, balance) VALUES(#{username}, #{name}, #{age}, #{balance})")
    int insertUser(User user);
}

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 {
}

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 findAllUsers();

    int insertUser(User user);
}

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 findAllUsers() {
        return iUserMapper.findAllUsers();
    }

    @Override
    public int insertUser(User user) {
        return iUserMapper.insertUser(user);
    }
}

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 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;
    }
}

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.");
    }
}

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;
 ****************************************************************************************/

四、下载地址

https://gitee.com/ylimhhmily/SpringCloudTutorial.git

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