使用Spring掃描Mybatis的mapper接口的三種配置
Spring掃描Mybatis的mapper接口的配置
1.前言
mybatis支持與spring結合使用,使得mybatis中的mapper接口可以作為spring容器中的bean被應用代碼中相關類,如Service類,通過@Autowired自動註入進來。
在使用方面需要在項目中引入以下包:
<dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.3.1</version> </dependency>
2. 在spring中可以通過三種方式
來自動掃描獲取應用代碼的mybatis相關的mapper接口定義:
2.1在applicationContext.xml中使用<mybatis:scan />
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> ... <!-- mybatis --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="mapperLocations" value="classpath:mybatis/mapper/**/*.xml" /> <property name="configLocation" value="classpath:mybatis/mybitas-config.xml" /> </bean> <mybatis:scan base-package="cn.cggeeker.dao"/> ... </beans>
2.2在applicationContext.xml中
使用bean標簽註冊MapperScannerConfigurer,即:
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" 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-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> ... <!-- mybatis --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource" /> <property name="mapperLocations" value="classpath:mybatis/mapper/**/*.xml" /> <property name="configLocation" value="classpath:mybatis/mybitas-config.xml" /> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="cn.cggeeker.dao" /> </bean> ... </beans>
2.3如果應用是使用Java配置方式而不是XML
則在@Configuration配置類使用@MapperScan或者@MapperScans註解:
@Configuration @MapperScan("cn.cggeeker.dao") public class AppConfig { @Bean public DataSource dataSource() { return new PooledDataSource("com.mysql.jdbc.Driver", "jdbc:mysql://localhost:3306/test", "root", "root"); } @Bean public SqlSessionFactory sqlSessionFactory() throws Exception { SqlSessionFactoryBeansessionFactory = new SqlSessionFactoryBean(); sessionFactory.setDataSource(dataSource()); return sessionFactory.getObject(); } }
Spring配置掃描mybatis的mapper文件註意
一般會將不業務的mapper文件放到不同的包中:
spring配置掃描就需要配置下面的方式(兩個*):
<!-- mybatis文件配置,掃描所有mapper文件 --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean" p:dataSource-ref="dataSource" p:configLocation="classpath:conf/mybatis-config.xml" p:mapperLocations="classpath:mapper/**/*.xml" />
以上為個人經驗,希望能給大傢一個參考,也希望大傢多多支持WalkonNet。
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