时间:2023-01-24 10:49:30 | 栏目:JAVA代码 | 点击:次
最近公司由于业务需要,对日益增加的数据量越来越无法容忍,遂作出分库分表的决定,考察了几个技术方案后,决定使用shardingsphere做分表中间件。
使用maven拉取jar包:
<dependency> <groupId>io.shardingsphere</groupId> <artifactId>sharding-jdbc</artifactId> <version>3.0.0.M3</version> </dependency> <dependency> <groupId>io.shardingsphere</groupId> <artifactId>sharding-jdbc-spring-namespace</artifactId> <version>3.0.0.M3</version> </dependency>
分表配置:
<?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:tx="http://www.springframework.org/schema/tx" xmlns:sharding="http://shardingsphere.io/schema/shardingsphere/sharding" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://shardingsphere.io/schema/shardingsphere/sharding http://shardingsphere.io/schema/shardingsphere/sharding/sharding.xsd" default-autowire="byName"> <!-- 分表算法 --> <bean id="tableShardingAlgorithm" class="pxf.commom.support.sharding.tableShardingAlgorithm" /> <sharding:complex-strategy id="tableStrategy" sharding-columns="uid" algorithm-ref="tableShardingAlgorithm" /> <!-- ds_0为数据源,如果做分库,可配置多个数据源;不分表的表不用在此做配置--> <sharding:data-source id="dataSource"> <sharding:sharding-rule data-source-names="ds_0" default-data-source-name="ds_0" > <sharding:table-rules> <sharding:table-rule logic-table="test_table" actual-data-nodes="ds_0.test_table_$->{0..128}" table-strategy-ref="tableStrategy" /> </sharding:table-rules> </sharding:sharding-rule> </sharding:data-source> </beans>
1). 用于分表的列在sql中不能为空,所以像insert之类的语句需要做下非空判断;
2). sqlmap中LONGVARCHER字段不能使用,会报序列化异常,可改为VARCHAR类型;
3). union语法不支持,可改为OR查询(shardingjdbc连OR也不支持,所以建议使用shardingsphere)。