Spring整合MyBatis步骤,简单来说就是三步:
- 导入相关的jar包
- 编写配置文件
- 进行测试
下面详细说明。
先测试mybatis是否成功:
1、创建一个maven项目。
2、导入jar包
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.8</version>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!--Spring-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.10.RELEASE</version>
</dependency>
<!--Spring jdbc(new)-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.10.RELEASE</version>
</dependency>
<!--aop aspectjweaver-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.4</version>
</dependency>
<!--mybatis-spring-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
如果xml在java文件下,就要设置资源过滤。
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>true</filtering>
</resource>
</resources>
</build>
3、编写实体类User
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
private int id;
private String name;
private String pwd;
}
4、编写接口UserMapper
public interface UserMapper {
public List<User> getUserList();
}
5、编写配置文件UserMapper.xml
<?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.llx.mapper.UserMapper">
<select id="getUserList" resultType="User">
select * from user;
</select>
</mapper>
6、编写核心配置文件 mybatis-config.xml
<?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>
<properties resource="db.properties"/>
<typeAliases>
<package name="com.llx.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="${driver}"/>
<property name="url" value="${url}"/>
<property name="username" value="${username}"/>
<property name="password" value="${pwd}"/>
</dataSource>
</environment>
</environments>
<mappers>
<mapper resource="com/llx/mapper/xml/UserMapper.xml"/>
</mappers>
</configuration>
7、测试
@Test
public void test1() throws IOException {
SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(Resources.getResourceAsReader("mybatis-config.xml"));
SqlSession sqlSession = sqlSessionFactory.openSession();
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
List<User> userList = mapper.getUserList();
for (User user : userList) {
System.out.println(user);
}
}
若测试成功,则可以进行整合了。
1、在applicationContext.xml中编写数据源配置
<!--1. 数据源整合-->
<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=true&useUnicode=true&characterEncoding=utf-8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</bean>
2、在applicationContext.xml中编写sqlSessionFactory配置
<!-- 2. 注入sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--扫描包-->
<!--<property name="configLocation" value="classpath:mybatis-config.xml"/>-->
<property name="mapperLocations" value="classpath:com/llx/mapper/xml/*.xml"/>
<property name="typeAliasesPackage" value="com.llx.pojo"/>
</bean>
3、在applicationContext.xml中编写sqlSession配置
<!--3. 注入sqlSession-->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
4、此时需要给接口增加实现类,编写UserMapperImpl
public class UserMapperImpl implements UserMapper {
private SqlSessionTemplate sqlSession;
public void setSqlSession(SqlSessionTemplate sqlSession) {
this.sqlSession = sqlSession;
}
public List<User> getUserList() {
UserMapper mapper = sqlSession.getMapper(UserMapper.class);
return mapper.getUserList();
}
}
5、将写的实现类,注入到Spring中
<!--4. 放入Bean-->
<bean id="userMapperImpl" class="com.llx.mapper.impl.UserMapperImpl">
<property name="sqlSession" ref="sqlSession"/>
</bean>
6、测试
@Test
public void test2() throws IOException {
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper userMapperImpl = (UserMapper) context.getBean("userMapperImpl");
List<User> userList = userMapperImpl.getUserList();
for (User user : userList) {
System.out.println(user);
}
}
事务
事务可以理解为,把一组业务当成一个业务来做,它们要么都成功,要么都失败。
在项目开发中,事务是非常重要的,它涉及到数据的一致性问题,我们需要确保数据的完整性和一致性。
所以在spring中也要添加事务,进行事务的管理。
具体做法是在spring中去配置声明式事务。
<!-- 整合事务 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<constructor-arg ref="dataSource" />
</bean>
<!-- 事务配置增强(一个连接 aop,一个连接transactionManager ) -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<!--propagation事务的传播特性-->
<tx:method name="*" propagation="REQUIRED"/>
</tx:attributes>
</tx:advice>
<!-- AOP配置 -->
<aop:config>
<aop:pointcut id="txPointCut" expression="execution(* com.llx.mapper.*.*(..))"/>
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPointCut"/>
</aop:config>