springboot-day02-整合mybatis与简单使用

前言：该文章是紧接上一篇文章springboot-day01-引入如何读取配置文件以及helloWorld

1.springboot整合mybatis

1.添加jar包依赖

 <?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>

     <groupId>com.example</groupId>
     <artifactId>demo</artifactId>
     <version>0.0.1-SNAPSHOT</version>
     <packaging>jar</packaging>

     <name>demo</name>
     <description>Demo project for Spring Boot</description>
     <!--设置spring boot的parent-->
     <parent>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter-parent</artifactId>
         <version>1.5.9.RELEASE</version>
         <relativePath/> <!-- lookup parent from repository -->
     </parent>

     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
         <java.version>1.7</java.version>
     </properties>

     <dependencies>
         <!--添加依赖 可以访问html页面-->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-thymeleaf</artifactId>
         </dependency>
     <!--    spring boot的web支持-->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
         <!--mybatis-spring桥梁-->
         <dependency>
             <groupId>org.mybatis.spring.boot</groupId>
             <artifactId>mybatis-spring-boot-starter</artifactId>
             <version>1.1.1</version>
         </dependency>
         <!--mysql驱动包-->
         <dependency>
             <groupId>mysql</groupId>
             <artifactId>mysql-connector-java</artifactId>
             <scope>runtime</scope>
         </dependency>
         <!--aop-->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-aop</artifactId>
         </dependency>
         <!--jdbc-->
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-jdbc</artifactId>
         </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>
             <scope>test</scope>
         </dependency>
     </dependencies>

     <build>
         <plugins>
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
             </plugin>
         </plugins>
     </build>

 </project>

2.在application.properties添加数据库连接信息

代码

 ##########################数据库连接信息###################################
 spring.datasource.url=jdbc:mysql://localhost:3306/station
 spring.datasource.username=root
 spring.datasource.password=admin
 spring.datasource.driverClassName=com.mysql.jdbc.Driver
 spring.jpa.database = mysql

3.创建标准web目录结构

4.创建数据库表User

.

5.创建User实体 USer.java

 package com.example.demo.model;

 /**
  * Created by Administrator on 2017/12/20.
  */
 public class User {
     private Integer id;
     private String userName;
     private String password;
     private String qq;
     private String wx;

     public Integer getId() {
         return id;
     }

     public void setId(Integer id) {
         this.id = id;
     }

     public String getUserName() {
         return userName;
     }

     public void setUserName(String userName) {
         this.userName = userName;
     }

     public String getPassword() {
         return password;
     }

     public void setPassword(String password) {
         this.password = password;
     }

     public String getQq() {
         return qq;
     }

     public void setQq(String qq) {
         this.qq = qq;
     }

     public String getWx() {
         return wx;
     }

     public void setWx(String wx) {
         this.wx = wx;
     }
 }

User.java

6.创建dao接口

 package com.example.demo.dao;

 import com.example.demo.model.User;
 import org.apache.ibatis.annotations.Mapper;
 import org.springframework.stereotype.Repository;

 /**
  * Created by Administrator on 2017/12/20.
  */
 //声明是一个Mapper,与springbootApplication中的@MapperScan二选一写上即可
 @Mapper
 @Repository
 public interface UserMapper {
     /**
      * 根据名称获取一个用户
      * @param name
      * @return
      */
     User getUserByName(String name);
 }

UserMapper.java

7.创建service接口

 package com.example.demo.service;

 import com.example.demo.model.User;
 import org.springframework.stereotype.Service;

 /**
  * Created by Administrator on 2017/12/20.
  */
 @Service
 public interface IUserService {
     /**
      * 根据名称获取一个用户
      * @param name
      * @return
      */
     User getUserByName(String name);
 }

IUserService.java

8.编辑service实现类

 package com.example.demo.service.impl;

 import com.example.demo.dao.UserMapper;
 import com.example.demo.model.User;
 import com.example.demo.service.IUserService;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;

 /**
  * Created by Administrator on 2017/12/20.
  */
 @Service
 public class UserService implements IUserService {
     @Autowired
     private UserMapper userMapper;

     @Override
     public User getUserByName(String name) {
         return userMapper.getUserByName(name);
     }
 }

UserService.java

9.编辑UserControlle控制层

 package com.example.demo.controller;

 import com.example.demo.model.User;
 import com.example.demo.service.IUserService;
 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;

 /**
  * Created by Administrator on 2017/12/20.
  */
 @Controller
 @RequestMapping("/")
 public class UserController {
     @Autowired
     private IUserService userService;

     /**
      * 获取用户
      * @return
      */
     @RequestMapping("/getUser")
     @ResponseBody
     public User getUserByName(){
         User user= userService.getUserByName("姿势帝");
         System.out.println("id="+user.getId()+"   userName="+user.getUserName()+"   qq="+user.getQq());
         return user;
     }
 }

UserController.java

10.将sql写到xml配置文件中,添加映射

userMapper.xml代码

 <?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.example.demo.dao.UserMapper" >

     <select id="getUserByName"  resultType="User">
       SELECT id,user_name userName,`password`,qq,wx FROM `user` WHERE user_name=#{userName}
     </select>

 </mapper>

userMapper.xml

11.非常重要--在application.properties添加mybatis相关配置

 #Mybatis xml文件扫描
 mybatis.mapper-locations=classpath*:mapper/*.xml
 #起别名。可省略写mybatis的xml中的resultType的全路径
 mybatis.type-aliases-package=com.example.demo.model

12.重启项目并访问

基于springboot的ssm整合以及简单使用已完成,很简单吧! 下章我们基于这个结构完成页面上的 CRUD+高级查询+分页

下一章见!

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