Spring与MyBatis整合环境搭建

实验目标

• 掌握Mybatis原理

• 掌握Mybatis环境搭建步骤

• 最终执行有相应的效果

知识点回顾

• Jdbc连接数据库流程

实验分析

1. 理解Mybatis环境搭建过程。

实验步骤

1. 数据库建表（截图）
   

2. 创建Maven工程
   

3. 导入相关依赖

   pom.xml 文件里面引入 mybatis和mysql依赖

   

   <dependencies>
           <!-- mysql -->
           <dependency>
               <groupId>mysql</groupId>
               <artifactId>mysql-connector-java</artifactId>
               <version>5.1.45</version>
           </dependency>
   
           <!-- mybatis -->
           <dependency>
               <groupId>org.mybatis</groupId>
               <artifactId>mybatis</artifactId>
               <version>3.4.6</version>
           </dependency>
   
           <!-- junit -->
           <dependency>
               <groupId>junit</groupId>
               <artifactId>junit</artifactId>
               <version>4.12</version>
               <scope>test</scope>
           </dependency>
       </dependencies>
   

4. 编写pojo和dao接口

   User:
   

   package com.dxj.pojo;
   
   public class User {
         
         
   
       //建议属性名和字段名保持一致
       private Long id;
       private String username;
       private String password;
       private Integer isadmin;
   
       public User() {
         
         
       }
   
       public User(Long id, String username, String password, Integer isadmin) {
         
         
           this.id = id;
           this.username = username;
           this.password = password;
           this.isadmin = isadmin;
       }
   
       public Long getId() {
         
         
           return id;
       }
   
       public void setId(Long 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 Integer getIsadmin() {
         
         
           return isadmin;
       }
   
       public void setIsadmin(Integer isadmin) {
         
         
           this.isadmin = isadmin;
       }
   
       @Override
       public String toString() {
         
         
           return "User{" +
                   "id=" + id +
                   ", username='" + username + '\'' +
                   ", password='" + password + '\'' +
                   ", isadmin=" + isadmin +
                   '}';
       }
   }
   
   

   UserDao:
   

   扫描二维码关注公众号，回复： 13374491 查看本文章

   package com.dxj.dao;
   
   import com.dxj.pojo.User;
   
   public interface UserDao {
         
         
   
       //查询单个
       public User queryUserById(Long id);
   }
   
   

5. 创建MyBatis配置文件
   

   需要先引入mybatis-3-config.dtd文件

   settings---->Schemas and DTDs------>右边点击 + 新建 ------>弹框 uri 输入 http://mybatis.org/dtd/mybatis-3-config.dtd file 选择本机mybatis-3-config.dtd文件 ---->apply—>ok
   

   配置mybatis配置文件：
   

   <?xml version="1.0" encoding="UTF-8"?>
   <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" >
   <configuration>
   
       <!--引入外部文件-->
       <properties resource="db.properties"/>
   
       <!--配置连接数据库配置信息-->
       <environments default="development">
           <environment id="development">
               <transactionManager type="JDBC"></transactionManager>
               <dataSource type="POOLED">
   
                   <property name="driver" value="${jdbc.driver}"/>
                   <property name="url" value="${jdbc.url}"/>
                   <property name="username" value="${jdbc.username}"/>
                   <property name="password" value="${jdbc.password}"/>
               </dataSource>
           </environment>
       </environments>
   
       <!--引入映射文件-->
       <mappers>
           <mapper resource="mapper/UserMapper.xml"/>
       </mappers>
   
   </configuration>
   

6. 创建MyBatis映射文件
   
   

   <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
   <!--namespace 值必须和接口路径保持一致-->
   <mapper namespace="com.dxj.dao.UserDao">
   
       <!--id值必须和接口里面的方法名保持一致-->
       <select id="queryUserById" parameterType="java.lang.Long" resultType="com.dxj.pojo.User">
           select * from users where id = #{id}
       </select>
   </mapper>
   

7. 单元测试调用
   

   package test;
   
   import com.dxj.dao.UserDao;
   import com.dxj.pojo.User;
   import org.apache.ibatis.io.Resources;
   import org.apache.ibatis.session.SqlSession;
   import org.apache.ibatis.session.SqlSessionFactory;
   import org.apache.ibatis.session.SqlSessionFactoryBuilder;
   import org.junit.Test;
   
   import java.io.IOException;
   import java.io.InputStream;
   
   public class Test1 {
         
         
   
       @Test
       public void test1() throws IOException {
         
         
   
           //加载配置文件 并读取 通过IO流
           //1.获取输入流
           InputStream in = Resources.getResourceAsStream("mybatis-config.xml");
           SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
           SqlSession session = sqlSessionFactory.openSession();
           User user = session.selectOne("com.dxj.dao.UserDao.queryUserById", 1L);
           System.out.println(user);
           session.close();
   
       }
   }