ibatis/mybatis分库工具包cobarclient的使用
cobar分为client和server：server是一个独立的服务；client则是一个引用jar包。
github地址：https://github.com/alibaba/cobar、https://github.com/alibaba/cobarclient
本文主要记录cobarclient的常用配置
我用的2.1.0版本，maven配置：
<dependency> <groupId>com.alibaba.cobar</groupId> <artifactId>cobar-client</artifactId> <version>2.1.0-SNAPSHOT</version> </dependency>
spring的相关配置：
<?xml version="1.0" encoding="utf-8"?> <beans default-autowire="byName" xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.5.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-2.5.xsd"> <util:set id="shardSet" set-class="java.util.LinkedHashSet"> <ref bean="shard1"/> <ref bean="shard2"/> </util:set> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <property name="filters" value="stat" /> <property name="maxActive" value="${jdbc.maxActive}" /> <property name="initialSize" value="1" /> <property name="maxWait" value="${jdbc.maxIdle}" /> <property name="minIdle" value="1" /> <property name="timeBetweenEvictionRunsMillis" value="3000" /> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT 'x'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <property name="poolPreparedStatements" value="true" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> </bean> <bean id="dataSource1" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="url" value="${jdbc1.url}" /> <property name="username" value="${jdbc1.username}" /> <property name="password" value="${jdbc1.password}" /> <property name="filters" value="stat" /> <property name="maxActive" value="${jdbc1.maxActive}" /> <property name="initialSize" value="1" /> <property name="maxWait" value="${jdbc1.maxIdle}" /> <property name="minIdle" value="1" /> <property name="timeBetweenEvictionRunsMillis" value="3000" /> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT 'x'" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <property name="poolPreparedStatements" value="true" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> </bean> <bean id="shard1" class="com.alibaba.cobarclient.Shard"> <property name="id" value="shard1"></property> <property name="dataSource" ref="dataSource"></property> </bean> <bean id="shard2" class="com.alibaba.cobarclient.Shard"> <property name="id" value="shard2"></property> <property name="dataSource" ref="dataSource1"></property> </bean> <util:map id="functionsMap"> <entry key="hash" value-ref="hashFunction"> </entry> </util:map> <bean id="hashFunction" class="com.raycloud.maijia.db.router.rules.support.HashFunction"/> <bean id="router" class="com.alibaba.cobarclient.config.SimpleRouterFactoryBean"> <property name="configLocations"> <list> <value>classpath:/dbrule/sqlaction-sharding-rules.xml</value> <value>classpath:/dbrule/ns-sharding-rules.xml</value> </list> </property> <property name="functions" ref="functionsMap"></property> <property name="shards" ref="shardSet"></property> </bean> <bean id="sqlMapClient" class="org.springframework.orm.ibatis.SqlMapClientFactoryBean"> <property name="configLocations" value="classpath:/sqlmap-config.xml"></property> </bean> <bean id="sqlMapClientTemplate" class="com.alibaba.cobarclient.MysdalSqlMapClientTemplate"> <property name="sqlMapClient" ref="sqlMapClient" /> <property name="shards" ref="shardSet"></property> <property name="router" ref="router"></property> </bean> <tx:annotation-driven transaction-manager="txManager" proxy-target-class="true" /> <aop:aspectj-autoproxy proxy-target-class="true" /> <bean id="txManager" class="com.alibaba.cobarclient.transaction.BestEffortMultiDataSourceTransactionManager"> <property name="shards" ref="shardSet"></property> </bean> </beans> 根据namespace的路由规则配置文件ns-sharding-rules.xml：
<rules> <rule> <namespace>sqlmap_shop_statistics</namespace> <shardingExpression><![CDATA[hash.apply(shopId)==0]]></shardingExpression> <shards>shard1</shards> </rule> <rule> <namespace>sqlmap_shop_statistics</namespace> <shardingExpression><![CDATA[hash.apply(shopId)==1]]></shardingExpression> <shards>shard2</shards> </rule> </rules>
根据sqlmap的路由规则配置文件sqlaction-sharding-rules.xml：
<rules> <rule> <sqlmap>sqlmap_shop.queryShopDetailById</sqlmap> <shardingExpression><![CDATA[hash.apply(id)==0]]></shardingExpression> <shards>shard1</shards> </rule> <rule> <sqlmap>sqlmap_shop.queryShopDetailById</sqlmap> <shardingExpression><![CDATA[hash.apply(id)==1]]></shardingExpression> <shards>shard2</shards> </rule> </rules>
注：这里的分片表达式也可以直接写成：
<shardingExpression>true</shardingExpression>
如果一个查询要查询两个片（不要有空格哦）：
<rule> <sqlmap>sqlmap_shop.queryShopDetailById</sqlmap> <shardingExpression><![CDATA[hash.apply(id)==1]]></shardingExpression> <shards>shard1,shard2</shards> </rule>
cobarclient最近更新有点慢，如果业务不是很复杂的话，可以用下，毕竟轻量级的还是比较方便移植或替代的。
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