Spring整合MyBatis
整合步骤
一、导入相关jar包
（1）junit
<dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency>
（2) mybatis
<dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.2</version> </dependency>
（3）mysql-connector-java
<dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.19</version> </dependency>
（4）spring相关
<dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>5.1.10.RELEASE</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>5.1.10.RELEASE</version> </dependency>
（5）AspectJ AOP 织入器
<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.4</version> </dependency>
（6）mybatis-spring整合包 【重点】
<dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.2</version> </dependency>
（7）配置Maven静态资源过滤问题！
<build> <resources> <resource> <directory>src/main/java</directory> <includes> <include>**/*.properties</include> <include>**/*.xml</include> </includes> <filtering>true</filtering> </resource> </resources> </build>
二、编写配置文件，代码实现
回忆MyBatis
1、创建实体类
package com.jia.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @AllArgsConstructor @NoArgsConstructor public class User { private Integer id; //编号 private String username; //用户名 private String password; //密码 }
实现mybatis全局配置文件（也是核心配置文件）
<?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> <!--配置别名--> <typeAliases> <package name="com.jia.pojo"/> </typeAliases> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="com.mysql.cj.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/> <property name="username" value="root"/> <property name="password" value="123456"/> </dataSource> </environment> </environments> <!--注册SQL映射文件--> <mappers> <mapper class="com.jia.mapper.UserMapper"/> </mappers> </configuration>
UserMapper接口编写
package com.jia.mapper; import com.jia.pojo.User; import java.util.List; public interface UserMapper { /** * 查询所有用户 * @return */ public List<User> selectUser(); /** * 根据id查询用户 * @param id * @return */ public User selectUserById(Integer id); }
接口对应的Mapper映射文件
<?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"> <!--绑定接口--> <mapper namespace="com.jia.mapper.UserMapper"> <select id="selectUser" resultType="User"> SELECT * FROM User </select> <select id="selectUserById" resultType="User" parameterType="int"> SELECT * FROM User WHERE id=#{id} </select> </mapper>
测试类
import com.jia.mapper.UserMapper; import com.jia.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; import java.util.List; public class MyTestMybatis {
@Test //查询所有用户 public void selectUser() throws IOException { String resource = "mybatis-config.xml"; InputStream input = Resources.getResourceAsStream(resource); SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(input); SqlSession sqlSession = sessionFactory.openSession(true); //ture:自动提交事务 UserMapper mapper = sqlSession.getMapper(UserMapper.class); List<User> userList = mapper.selectUser(); for (User user : userList) { System.out.println(user); } //释放资源 sqlSession.close(); }
@Test //根据id查询用户 public void selectUserById() throws IOException { String resource = "mybatis-config.xml"; InputStream input = Resources.getResourceAsStream(resource); SqlSessionFactory sessionFactory = new SqlSessionFactoryBuilder().build(input); SqlSession sqlSession = sessionFactory.openSession(true); UserMapper mapper = sqlSession.getMapper(UserMapper.class); User user = mapper.selectUserById(2); System.out.println(user); sqlSession.close(); } }
MyBatis-Spring学习
引入Spring之前需要了解mybatis-spring包中的一些重要类
官方文档：http://www.mybatis.org/spring/zh/index.html
什么是 MyBatis-Spring？
MyBatis-Spring 会帮助你将 MyBatis 代码无缝地整合到 Spring 中
知识基础
在开始使用 MyBatis-Spring 之前，你需要先熟悉 Spring 和 MyBatis 这两个框架和有关它们的术语。这很重要
MyBatis-Spring 需要以下版本：
如果使用 Maven 作为构建工具，仅需要在 pom.xml 中加入以下代码即可：
<dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.2</version> </dependency>
整合实现
1、引入Spring配置文件beans.xml
<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">
2、配置数据源替换mybaits的数据源
<!--配置数据源：数据源有非常多，可以使用第三方的，也可使使用Spring的-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/> <property name="username" value="root"/> <property name="password" value="123456"/> </bean>
3、配置SqlSessionFactory，关联MyBatis
<!--配置SqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <!--关联Mybatis--> <property name="configLocation" value="classpath:mybatis-config.xml"/> <property name="mapperLocations" value="classpath:com/kuang/dao/*.xml"/> </bean>
4.注册sqlSessionTemplate，关联sqlSessionFactory；
<!--注册sqlSessionTemplate , 关联sqlSessionFactory--> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <!--利用构造器注入,源码里没有set方法--> <constructor-arg index="0" ref="sqlSessionFactory"/> </bean>
5、增加Dao接口的实现类，私有化sqlSessionTemplate
package com.jia.mapper; import com.jia.pojo.User; import org.mybatis.spring.SqlSessionTemplate; import java.util.List; public class UserMapperImpl implements UserMapper{ //sqlSession不用我们自己创建了，Spring来管理 private SqlSessionTemplate sqlSession; public void setSqlSession(SqlSessionTemplate sqlSession) { this.sqlSession = sqlSession; } public List<User> selectUser() { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.selectUser(); } public User selectUserById(Integer id) { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.selectUserById(2); } }
6、注册bean实现
<!--注册UserMapperImpl--> <bean id="userMapper" class="com.jia.mapper.UserMapperImpl"> <property name="sqlSession" ref="sqlSession"/> </bean>
7、测试
import com.jia.mapper.UserMapper; import com.jia.pojo.User; import org.junit.Test; import org.springframework.context.ApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import java.io.IOException; public class MyTestMybatis { @Test //查询所有用户 public void selectUser() throws IOException { ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); UserMapper userMapper = context.getBean("userMapper", UserMapper.class); for (User user : userMapper.selectUser()) { System.out.println(user); } } @Test //根据id查询用户 public void selectUserById() throws IOException { ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); UserMapper userMapper = context.getBean("userMapper", UserMapper.class); User userById = userMapper.selectUserById(1); System.out.println(userById); } }
结果成功输出！现在我们的Mybatis配置文件的状态！发现都可以被Spring整合！
<?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> <!--配置别名--> <typeAliases> <package name="com.jia.pojo"/> </typeAliases> </configuration>
