Spring-整合Mybatis
整合Mybatis
步骤:
- 导入相关jar包
- junit
- mybatis
- mysql数据库
- spring相关的
- aop织入
- mybatis-spring【新知识点】
- 编写配置文件
- 测试
1、回忆MyBatis
- 编写实体类
- 编写核心配置文件
- 编写接口
- 编写Mapper.xml
- 测试
2、mybatis-spring
1、导入所需的依赖
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.32</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.11</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.25</version>
</dependency>
<!--Spring操作数据库的话,还需要一个spring-jdbc的包-->
<!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.25</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.aspectj/aspectjweaver -->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.19</version>
<scope>runtime</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.26</version>
</dependency>
</dependencies>
2、MyBatis核心配置文件(配置sqlSessionFactory绑定后可将所有操作写进Spring配置文件,但可以在这里进行一些设置,方便管理)
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
</configuration>
3、Spring配置文件(配置方式写在最后)
<?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
https://www.springframework.org/schema/beans/spring-beans.xsd">
<bean id="..." class="...">
<!-- collaborators and configuration for this bean go here -->
</bean>
<bean id="..." class="...">
<!-- collaborators and configuration for this bean go here -->
</bean>
<!-- more bean definitions go here -->
</beans>
4、创建实体类
@Data
public class User {
private int id;
private String name;
private String pwd;
}
5、创建接口
public interface UserMapper {
List<User> selectUser();
}
6、创建映射文件
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"https://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.mapper.UserMapper">
<select id="selectUser" resultType="user">
select * from mybatis.user
</select>
</mapper>
Mybatis-Spring整合配置:
第一种方式:
-
编写数据源配置
<!-- DataSource:使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid 这里我们使用Spring提供的JDBC --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&characterEncoding=utf-8&useUnicode=true"/> <property name="username" value="root"/> <property name="password" value="123456"/> </bean>
-
sqlSessionFactory
<!--sqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <!--绑定mybatis配置文件--> <property name="configLocation" value="classpath:mybatis-config.xml"/> <!--绑定映射文件--> <property name="mapperLocations" value="classpath:com/kuang/mapper/UserMapper.xml"/> </bean>
-
sqlSessionTemplate
<!--SqlSessionTemplate:就是我们使用的sqlSession--> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate"> <!--只能使用构造器注入sqlSessionFactory,因为它没有set方法--> <constructor-arg index="0" ref="sqlSessionFactory"/> </bean>
-
需要给接口加实现类
public class UserMapperImpl implements UserMapper{ // 我们所有的操作,在原来都使用sqlSession来执行,现在都使用SQLSessionTemplate private SqlSessionTemplate sqlSession; public void setSqlSession(SqlSessionTemplate sqlSession) { this.sqlSession = sqlSession; } @Override public List<User> selectUser() { UserMapper mapper = sqlSession.getMapper(UserMapper.class); return mapper.selectUser(); } }
-
将实现类注入
<bean id="userMapper" class="com.kuang.mapper.UserMapperImpl"> <property name="sqlSession" ref="sqlSession"/> </bean>
-
测试类
public class MyTest { @Test public void getUsers() { ApplicationContext context = new ClassPathXmlApplicationContext("spring-dao.xml"); UserMapper userMapper = context.getBean("userMapper", UserMapper.class); List<User> users = userMapper.selectUser(); for (User user : users) { System.out.println(user); } } }
第二种方式:
-
编写数据源配置
<!-- DataSource:使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid 这里我们使用Spring提供的JDBC --> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"/> <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=false&characterEncoding=utf-8&useUnicode=true"/> <property name="username" value="root"/> <property name="password" value="123456"/> </bean>
-
sqlSessionFactory
<!--sqlSessionFactory--> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <!--绑定mybatis配置文件--> <property name="configLocation" value="classpath:mybatis-config.xml"/> <!--绑定映射文件--> <property name="mapperLocations" value="classpath:com/kuang/mapper/UserMapper.xml"/> </bean>
-
给接口加实现类(继承SqlSessionDaoSupport类,可直接用getSqlSession方法获取sqlSession,不再需要配置SqlSessionTemplate)
public class UserMapperImpl2 extends SqlSessionDaoSupport implements UserMapper{ @Override public List<User> selectUser() { return getSqlSession().getMapper(UserMapper.class).selectUser(); } }
-
将实现类注入
<bean id="userMapper2" class="com.kuang.mapper.UserMapperImpl2"> <property name="sqlSessionFactory" ref="sqlSessionFactory"/> </bean>
-
测试类
@Test public void getUsers() { ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml"); UserMapper userMapper = context.getBean("userMapper2", UserMapper.class); List<User> users = userMapper.selectUser(); for (User user : users) { System.out.println(user); } }