Spring Boot入門教程2-1、使用Spring Boot+MyBatis訪問數據庫（CURD）注解版

一、前言

• 什么是MyBatis？
  MyBatis是目前Java平台最為流行的ORM框架
  https://baike.baidu.com/item/MyBatis/2824918

• 本篇開發環境
  1、操作系統： Windows 10 X64
  2、Java SDK： jdk-8u141
  3、Maven：3.5
  4、IDE：IntelliJ IDEA 2017
  5、Spring Boot：1.5.6

本項目構建基於：https://ken.io/note/springboot-course-basic-helloworld

二、Spring Boot整合MyBatis

• 引入核心依賴

package	說明
mybatis-spring-boot-starter	MyBatis核心for Spring Boot
mysql-connector-java	用於連接MySQL

pom.xml文件：

<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.6.RELEASE</version> </parent> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.38</version> </dependency> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies> 

• 配置數據庫連接

在配置文件：application.yml中增加以下配置：

spring: datasource: driver-class-name: com.mysql.jdbc.Driver url: jdbc:mysql://localhost:3306/course?zeroDateTimeBehavior=convertToNull&useUnicode=true&characterEncoding=utf-8 username: mysql password: password 

數據庫自行創建MySQL下載地址：https://dev.mysql.com/downloads/

• Package創建

Package	說明
io.ken.springboot.course.model	用於存放實體
io.ken.springboot.course.dao	用於存放數據訪問映射*mapper

• user表&實體創建

1、user表創建腳本

DROP TABLE IF EXISTS `user`; CREATE TABLE `user` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(255) DEFAULT NULL, `age` int(11) DEFAULT NULL, `hobby` varchar(500) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; 

2、user實體

package io.ken.springboot.course.model; public class User { private int id; private String name; private int age; private String hobby; 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 int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getHobby() { return hobby; } public void setHobby(String hobby) { this.hobby = hobby; } } 

getger和setter可以選中類名之后使用快捷鍵Alt+Insert生成

• 創建UserMapper，用於User數據庫操作映射

package io.ken.springboot.course.dao; import io.ken.springboot.course.model.User; import org.apache.ibatis.annotations.*; import java.util.List; @Mapper public interface UserMapper { @Select("SELECT * FROM user WHERE id = #{id}") User queryById(@Param("id") int id); @Select("SELECT * FROM user") List<User> queryAll(); @Insert({"INSERT INTO user(name,age,hobby) VALUES(#{name},#{age},#{hobby})"}) int add(User user); @Delete("DELETE FROM user WHERE id = #{id}") int delById(int id); @Update("UPDATE user SET name=#{name},age=#{age},hobby=#{hobby} WHERE id = #{id}") int updateById(User user); } 

• 創建UserController並提供API

package io.ken.springboot.course.controller; import io.ken.springboot.course.dao.UserMapper; import io.ken.springboot.course.model.User; 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.ResponseBody; import java.util.List; @Controller @RequestMapping("/user") public class UserController { @Autowired UserMapper userMapper; @RequestMapping("/querybyid") @ResponseBody User queryById(int id) { return userMapper.queryById(id); } @RequestMapping("/queryall") @ResponseBody List<User> queryAll() { return userMapper.queryAll(); } @RequestMapping("/add") @ResponseBody String add(User user) { return userMapper.add(user) == 1 ? "success" : "failed"; } @RequestMapping("/updatebyid") @ResponseBody String updateById(User user) { return userMapper.updateById(user) == 1 ? "success" : "failed"; } @RequestMapping("/delbyid") @ResponseBody String delById(int id) { return userMapper.delById(id) == 1 ? "success" : "failed"; } } 

• API測試

API	示例
添加用戶	/user/add?name=tom&age=1&hobby=football
更新用戶	/user/updatebyid?name=ken&age=18&hobby=coding&id=1
查詢指定用戶	/user/querybyid?id=1
查詢所有用戶	/user/queryall
刪除指定用戶	/user/delbyid?id=2

本文代碼示例：https://github.com/ken-io/springboot-course/tree/master/chapter-02-01

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• 系列名稱：Spring Boot入門教程
  
• 下一篇：Spring Boot入門教程2-2、使用Spring Boot+MyBatis訪問數據庫（CURD）xml配置版
  
• 本篇首次發布：2017-08-15
• 本篇原文鏈接：https://ken.io/note/springboot-course-basic-curd-annotation