spring+mybatis实现读写分离

springmore-core

spring+ibatis实现读写分离

特点

无缝结合spring+ibatis，对于程序员来说，是透明的

除了修改配置信息之外，程序的代码不需要修改任何东西

支持spring的容器事务

规则:

基于spring配置的容器事务

读写事务到主库

只读事务到从库

如果没有配置事务，更新语句全部到主库，查询语句均衡到从库

实现源码：https://gitcafe.com/tangyanbo/springmore

下载spring-core即可

快速入门

maven依赖

<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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
">
<!-- C3P0连接池配置 -->
<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 工厂类 -->
<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>

事务配置(applicationContext.xml中)

<!-- 定义单个jdbc数据源的事务管理器 -->
<bean id="transactionManager"
class="org.springmore.core.datasource.DynamicDataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 以 @Transactional 标注来定义事务  -->
<tx:annotation-driven transaction-manager="transactionManager"
proxy-target-class="true" />

<!-- 配置事务的传播特性 -->
<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>
<!-- 那些类的哪些方法参与事务 -->
<aop:config>
<aop:pointcut id="allManagerMethod" expression="execution(* org.springmore.core.dao..*(..))" />
<aop:advisor pointcut-ref="allManagerMethod" advice-ref="txAdvice" />
</aop:config>

dao代码示例：

@Repository("UserMapperImpl")
public class UserMapperImpl implements UserMapper{

@Autowired
private DynamicSqlSessionTemplate sqlSessionTemplate;

//从库
public List<User> selectByUserNameAndPwd(User user) {
return sqlSessionTemplate.selectList("selectByUserNameAndPwd", user);
}

//主库
public void insert(User user) {
sqlSessionTemplate.insert("insert", user);
}
}