spring+mybatis實現讀寫分離

springmore-core

spring+ibatis實現讀寫分離

• 特點
  無縫結合spring+ibatis，對于程序員來說，是透明的
  除了修改配置信息之外，程序的代碼不需要修改任何東西
  支持spring的容器事務

• 規則:

1. 基于spring配置的容器事務
2. 讀寫事務到主庫
3. 只讀事務到從庫
4. 如果沒有配置事務，更新語句全部到主庫，查詢語句均衡到從庫
   實現源碼：https://gitcafe.com/tangyanbo/springmore
   下載spring-core即可

• 快速入門
  maven依賴

<dependency><groupId>org.springmore</groupId><artifactId>springmore-core</artifactId><version>1.0.0</version>
</dependency>

dataSource配置(applicationContext.xml中)

<?xml version="1.0" encoding="utf-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context-3.0.xsd"><!-- C3P0連接池配置 --><bean id="master" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass"><value>com.mysql.jdbc.Driver</value></property><property name="jdbcUrl"><value>jdbc:mysql://192.168.1.246:3306/db1</value></property><property name="user"><value>ysb</value></property><property name="password"><value>ysb</value></property><property name="initialPoolSize"><value>20</value></property><property name="minPoolSize"><value>20</value></property><property name="maxPoolSize"><value>200</value></property><property name="maxIdleTime"><value>255000</value></property></bean><bean id="dataSource2" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass"><value>com.mysql.jdbc.Driver</value></property><property name="jdbcUrl"><value>jdbc:mysql://192.168.1.246:3306/db2</value></property><property name="user"><value>ysb</value></property><property name="password"><value>ysb</value></property><property name="initialPoolSize"><value>20</value></property><property name="minPoolSize"><value>20</value></property><property name="maxPoolSize"><value>200</value></property><property name="maxIdleTime"><value>255000</value></property></bean><bean id="dataSource3" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass"><value>com.mysql.jdbc.Driver</value></property><property name="jdbcUrl"><value>jdbc:mysql://192.168.1.246:3306/db3</value></property><property name="user"><value>ysb</value></property><property name="password"><value>ysb</value></property><property name="initialPoolSize"><value>20</value></property><property name="minPoolSize"><value>20</value></property><property name="maxPoolSize"><value>200</value></property><property name="maxIdleTime"><value>255000</value></property></bean><bean id="dataSource" class="org.springmore.core.datasource.DynamicDataSource"><property name="master" ref="master" />     <property name="slaves"><list><ref bean="dataSource2"/><ref bean="dataSource3"/></list>         </property></bean>
</beans>

整合mybatis配置(applicationContext.xml中)

    <!-- ibatis3 工廠類 --><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="configLocation" value="classpath:sqlMapConfig.xml" /></bean><bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate"><constructor-arg index="0" ref="sqlSessionFactory" /></bean><bean id="dynamicSqlSessionTemplate" class="org.springmore.core.datasource.DynamicSqlSessionTemplate"><constructor-arg index="0" ref="sqlSessionTemplate" /></bean>

事務配置(applicationContext.xml中)

    <!-- 定義單個jdbc數據源的事務管理器 --><bean id="transactionManager"class="org.springmore.core.datasource.DynamicDataSourceTransactionManager"><property name="dataSource" ref="dataSource" /></bean><!-- 以 @Transactional 標注來定義事務  --><tx:annotation-driven transaction-manager="transactionManager"proxy-target-class="true" />        <!-- 配置事務的傳播特性 --><tx:advice id="txAdvice" transaction-manager="transactionManager"><tx:attributes><tx:method name="insert*" propagation="REQUIRED" read-only="false"rollback-for="Exception" /><tx:method name="delete*" propagation="REQUIRED" read-only="false"rollback-for="Exception" /><tx:method name="update*" propagation="REQUIRED" read-only="false"rollback-for="Exception" /><tx:method name="proc*" propagation="REQUIRED" read-only="false"rollback-for="Exception" /><tx:method name="select*" read-only="true" /><tx:method name="*" read-only="false" /><!-- <tx:method name="*" read-only="true" /> --></tx:attributes></tx:advice><!-- 那些類的哪些方法參與事務 --><aop:config><aop:pointcut id="allManagerMethod" expression="execution(* org.springmore.core.dao..*(..))" /><aop:advisor pointcut-ref="allManagerMethod" advice-ref="txAdvice" /></aop:config>

dao代碼示例：

@Repository("UserMapperImpl")
public class UserMapperImpl implements UserMapper{@Autowiredprivate DynamicSqlSessionTemplate sqlSessionTemplate;//從庫public List<User> selectByUserNameAndPwd(User user) {return sqlSessionTemplate.selectList("selectByUserNameAndPwd", user);}//主庫public void insert(User user) { sqlSessionTemplate.insert("insert", user);      }
}