基于sharding-jdbc 之spring+mybatis+sharding-jdbc整合
官方介绍文档: http://dangdangdotcom.github.io/sharding-jdbc/00-overview/
本文参考: http://blog.csdn.net/clypm/article/details/54378523
0.环境
ip :192.168.1.121
端口号:3306数据库1:sharding_0
数据库2:sharding_1
1.创建多个分库
create database sharding_0; create database sharding_1;
2.在各个分库上,创建多张分表
SET FOREIGN_KEY_CHECKS=0; -- 逻辑表 t_user -- 分表:t_user_0 DROP TABLE IF EXISTS `t_user_0`; CREATE TABLE `t_user_0` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 分表:t_user_1 DROP TABLE IF EXISTS `t_user_1`; CREATE TABLE `t_user_1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 分表: t_user_2 DROP TABLE IF EXISTS `t_user_2`; CREATE TABLE `t_user_2` ( `id` int(11) NOT NULL AUTO_INCREMENT, `user_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; DROP TABLE IF EXISTS `t_student_0`; CREATE TABLE `t_student_0` ( `id` int(11) NOT NULL AUTO_INCREMENT, `student_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; DROP TABLE IF EXISTS `t_student_1`; CREATE TABLE `t_student_1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `student_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; -- 学生表:测试事务时使用 DROP TABLE IF EXISTS `t_student_0`; CREATE TABLE `t_student_0` ( `id` int(11) NOT NULL AUTO_INCREMENT, `student_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8; DROP TABLE IF EXISTS `t_student_1`; CREATE TABLE `t_student_1` ( `id` int(11) NOT NULL AUTO_INCREMENT, `student_id` int(11) NOT NULL, `name` varchar(255) NOT NULL, `age` int(11) NOT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
3.案例:sharding-jdbc-mybatis-demo
3.1 组件
需要jar包:见 pom.xml ,加粗的标识
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.eshop</groupId> <artifactId>sharding-jdbc-mybatis-demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <spring.version>3.2.5.RELEASE</spring.version> <mybatis.version>3.2.4</mybatis.version> </properties> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.10</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-orm</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>commons-dbcp</groupId> <artifactId>commons-dbcp</artifactId> <version>1.4</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>1.2.2</version> </dependency> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>${mybatis.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-expression</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aop</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context-support</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-tx</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.16</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.5</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>3.2.4.RELEASE</version> </dependency> <!-- 分库分表使用的Dangdang Sharding-jdbc --> <dependency> <groupId>com.dangdang</groupId> <artifactId>sharding-jdbc-core</artifactId> <version>1.4.2</version> </dependency> <dependency> <groupId>com.dangdang</groupId> <artifactId>sharding-jdbc-config-spring</artifactId> <version>1.4.2</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.28</version> </dependency> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> </dependencies> </project>
错误分析:
<!-- sharding-jdbc-core 现在用这个最新版本1.4.2会报错,暂时用1.0.0,待研究-->
3.2 主配置文件applicationContext.xml
<?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.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <context:annotation-config /> <context:component-scan base-package="com.eshop.sharding.jdbc.*" /> <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <property name="location" value="classpath:bp.properties" /> </bean> <import resource="spring-database.xml" /> <import resource="spring-sharding.xml" /> </beans>
3.3 配置文件spring-database.xml
<?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" xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <!-- 基础数据源 --> <bean id="abstractDataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <property name="driverClassName" value="${jdbc_driver_0}" /> <!-- 初始化连接大小 --> <property name="initialSize" value="0" /> <!-- 连接池最大使用连接数量 --> <property name="maxActive" value="20" /> <!-- 连接池最小空闲 --> <property name="minIdle" value="0" /> <!-- 获取连接最大等待时间 --> <property name="maxWait" value="60000" /> <property name="validationQuery" value="${validationQuery}" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <property name="testWhileIdle" value="true" /> <!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间,单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="25200000" /> <!-- 打开removeAbandoned功能 --> <property name="removeAbandoned" value="true" /> <!-- 1800秒,也就是30分钟 --> <property name="removeAbandonedTimeout" value="1800" /> <!-- 关闭abanded连接时输出错误日志 --> <property name="logAbandoned" value="true" /> <property name="filters" value="stat" /> </bean> <bean id="sharding_0" class="com.alibaba.druid.pool.DruidDataSource" parent="abstractDataSource"> <property name="url" value="${jdbc_url0}" /> <property name="username" value="${jdbc_username0}" /> <property name="password" value="${jdbc_password0}" /> </bean> <bean id="sharding_1" class="com.alibaba.druid.pool.DruidDataSource" parent="abstractDataSource"> <property name="url" value="${jdbc_url1}" /> <property name="username" value="${jdbc_username1}" /> <property name="password" value="${jdbc_password1}" /> </bean> </beans>
3.4 配置文件spring-sharding.xml
<?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" xmlns:mybatis-spring="http://mybatis.org/schema/mybatis-spring" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://mybatis.org/schema/mybatis-spring http://mybatis.org/schema/mybatis-spring-1.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> <bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.eshop.sharding.jdbc.dao" /> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /> </bean> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="shardingDataSource"/> <property name="mapperLocations" value="classpath*:mappings/*Mapper.xml"/> </bean> <!-- 读写分离 <rdb:master-slave-data-source id="dataSource_0" master-data-source-ref="sharding_0" slave-data-sources-ref="sharding_2 "/>--> <bean id="shardingDataSource" class="com.dangdang.ddframe.rdb.sharding.api.ShardingDataSource"> <constructor-arg ref="shardingRule"/> </bean> <!-- 构成分库分表的规则 传入数据源集合和每个表的分库分表的具体规则 --> <bean id="shardingRule" class="com.dangdang.ddframe.rdb.sharding.api.rule.ShardingRule"> <constructor-arg index="0" ref="dataSourceRule"/> <constructor-arg index="1"> <list> <ref bean="userTableRule"/> <ref bean="studentTableRule"/> </list> </constructor-arg> </bean> <!-- 配置好dataSourceRulue,即对数据源进行管理 --> <bean id="dataSourceRule" class="com.dangdang.ddframe.rdb.sharding.api.rule.DataSourceRule"> <constructor-arg> <map> <entry key="sharding_0" value-ref="sharding_0"/> <entry key="sharding_1" value-ref="sharding_1"/> </map> </constructor-arg> </bean> <!-- t_user表的分库分表配置 --> <bean id="userTableRule" class="com.dangdang.ddframe.rdb.sharding.api.rule.TableRule"> <constructor-arg value="t_user" index="0"/> <!-- 逻辑表名 --> <constructor-arg index="1"> <!-- 物理表列表 --> <list> <value>t_user_0</value> <value>t_user_1</value> <value>t_user_2</value> </list> </constructor-arg> <constructor-arg index="2" ref="dataSourceRule"/> <!-- 数据源管理 --> <constructor-arg index="3" ref="userDatabaseShardingStrategy"/> <!-- 分库策略 --> <constructor-arg index="4" ref="userTableShardingStrategy"/> <!-- 分表策略 --> </bean> <!-- t_user分库策略 --> <bean id="userDatabaseShardingStrategy" class="com.dangdang.ddframe.rdb.sharding.api.strategy.database.DatabaseShardingStrategy"> <constructor-arg index="0" value="user_id"/> <!-- 分库字段 --> <constructor-arg index="1"> <!-- 分库策略 --> <bean class="com.eshop.sharding.jdbc.algorithm.UserSingleKeyDatabaseShardingAlgorithm" /> </constructor-arg> </bean> <!-- t_user 分表策略 --> <bean id="userTableShardingStrategy" class="com.dangdang.ddframe.rdb.sharding.api.strategy.table.TableShardingStrategy"> <constructor-arg index="0" value="user_id"/><!-- 分表字段 --> <constructor-arg index="1"><!-- 分表策略 --> <bean class="com.eshop.sharding.jdbc.algorithm.UserSingleKeyTableShardingAlgorithm" /> </constructor-arg> </bean> <!-- 事务 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="shardingDataSource" /> </bean> <tx:annotation-driven transaction-manager="transactionManager" /> </beans>
3.5 log.xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE log4j:configuration PUBLIC "-//APACHE//DTD LOG4J 1.2//EN" "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <!-- [控制台STDOUT] --> <appender name="console" class="org.apache.log4j.ConsoleAppender"> <param name="encoding" value="GBK" /> <param name="target" value="System.out" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%-5p %c{2} - %m%n" /> </layout> </appender> <!-- [公共Appender] --> <appender name="DEFAULT-APPENDER" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="${webapp.root}/logs/common-default.log" /> <param name="Append" value="true" /> <param name="encoding" value="GBK" /> <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n" /> </layout> </appender> <!-- [错误日志APPENDER] --> <appender name="ERROR-APPENDER" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="${webapp.root}/logs/common-error.log" /> <param name="Append" value="true" /> <param name="encoding" value="GBK" /> <param name="threshold" value="error" /> <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n" /> </layout> </appender> <!-- [组件日志APPENDER] --> <appender name="COMPONENT-APPENDER" class="org.apache.log4j.DailyRollingFileAppender"> <param name="File" value="${webapp.root}/logs/logistics-component.log" /> <param name="Append" value="true" /> <param name="encoding" value="GBK" /> <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p %c{2} - %m%n" /> </layout> </appender> <!-- [组件日志] --> <logger name="LOGISTICS-COMPONENT"> <level value="${loggingLevel}" /> <appender-ref ref="COMPONENT-APPENDER" /> <appender-ref ref="ERROR-APPENDER" /> </logger> <!-- Root Logger --> <root> <level value="${rootLevel}"></level> <appender-ref ref="DEFAULT-APPENDER" /> <appender-ref ref="ERROR-APPENDER" /> <appender-ref ref="console" /> <appender-ref ref="COMPONENT-APPENDER" /> </root> </log4j:configuration>
4.相关的类
4.1ShardingTmInterceptor
在跨库查询时,必须加这个类实现HandlerInterceptorAdapter,否则报错
package com.eshop.sharding.jdbc.aop; import java.util.Date; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.sql.DataSource; import org.springframework.context.support.AbstractApplicationContext; import org.springframework.context.support.ClassPathXmlApplicationContext; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.transaction.TransactionStatus; import org.springframework.transaction.support.AbstractPlatformTransactionManager; import org.springframework.transaction.support.TransactionCallbackWithoutResult; import org.springframework.transaction.support.TransactionTemplate; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.handler.HandlerInterceptorAdapter; public class ShardingTmInterceptor extends HandlerInterceptorAdapter { @Override public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception { // TODO Auto-generated method stub super.afterCompletion(request, response, handler, ex); } @Override public void afterConcurrentHandlingStarted(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { // TODO Auto-generated method stub super.afterConcurrentHandlingStarted(request, response, handler); } @Override public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception { // TODO Auto-generated method stub super.postHandle(request, response, handler, modelAndView); } @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception { AbstractApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml"); //获取分库分表数据源 DataSource shardingDataSource = (DataSource) ctx.getBean("shardingDataSource"); //创建jdbcTemplate final JdbcTemplate jdbcTemplate = new JdbcTemplate(shardingDataSource); //获取事务管理器 AbstractPlatformTransactionManager transactionManager = (AbstractPlatformTransactionManager) ctx.getBean("transactionManager"); //创建事务模板 TransactionTemplate transactionTemplate = new TransactionTemplate(transactionManager); //执行SQL(product是逻辑表名,id是分库分表键) transactionTemplate.execute(new TransactionCallbackWithoutResult() { @Override protected void doInTransactionWithoutResult(TransactionStatus arg0) { //HintManager hintManager = HintManager.getInstance(); //hintManager.setMasterRouteOnly(); String sql = "insert into product(id,title,last_modified) values(?,?,?)"; jdbcTemplate.update(sql,1L,"title",new Date()); //jdbcTemplate.queryForList("select id,title from product where id = ?",1L); } }); return super.preHandle(request, response, handler); } }
4.2 持久层接口类
UserDao
package com.eshop.sharding.jdbc.dao; import java.util.List; import com.eshop.sharding.jdbc.domain.User; public interface UserDao { Integer insert(User u); List<User> findAll(); List<User> findByUserIds(List<Integer> userIds); }
对应的Mapper文件UserDao.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" > <mapper namespace="com.eshop.sharding.jdbc.dao.UserDao" > <!-- namespace必须写成对应的接口类 -> <resultMap id="resultMap" type="com.eshop.sharding.jdbc.domain.User" > <id column="id" property="id" jdbcType="INTEGER" /> <result column="user_id" property="userId" jdbcType="INTEGER" /> <result column="name" property="name" jdbcType="VARCHAR" /> <result column="age" property="age" jdbcType="INTEGER" /> </resultMap> <sql id="columnsName"> id,user_id,name,age </sql> <insert id="insert"> insert into t_user (user_id,name,age) values (#{userId},#{name},#{age}) </insert> <select id="findAll" resultMap="resultMap"> select <include refid="columnsName"/> from t_user </select> <select id="findByUserIds" resultMap="resultMap"> select <include refid="columnsName"/> from t_user where user_id in ( <foreach collection="list" item="item" separator=","> #{item} </foreach> ) </select> </mapper>
4.3 分库/分表策略类
UserSingleKeyDatabaseShardingAlgorithm.java
package com.eshop.sharding.jdbc.algorithm; import java.util.Collection; import java.util.LinkedHashSet; import com.dangdang.ddframe.rdb.sharding.api.ShardingValue; import com.dangdang.ddframe.rdb.sharding.api.strategy.database.SingleKeyDatabaseShardingAlgorithm; import com.google.common.collect.Range; /** * USER表分库的逻辑函数 * @author lyncc * */ public class UserSingleKeyDatabaseShardingAlgorithm implements SingleKeyDatabaseShardingAlgorithm<Integer>{ /** * sql 中关键字 匹配符为 =的时候,表的路由函数 */ public String doEqualSharding(Collection<String> availableTargetNames, ShardingValue<Integer> shardingValue) { for (String each : availableTargetNames) { if (each.endsWith(shardingValue.getValue() % 2 + "")) { return each; } } throw new IllegalArgumentException(); } /** * sql 中关键字 匹配符为 in 的时候,表的路由函数 */ public Collection<String> doInSharding(Collection<String> availableTargetNames, ShardingValue<Integer> shardingValue) { Collection<String> result = new LinkedHashSet<String>(availableTargetNames.size()); for (Integer value : shardingValue.getValues()) { for (String tableName : availableTargetNames) { if (tableName.endsWith(value % 2 + "")) { result.add(tableName); } } } return result; } /** * sql 中关键字 匹配符为 between的时候,表的路由函数 */ public Collection<String> doBetweenSharding(Collection<String> availableTargetNames, ShardingValue<Integer> shardingValue) { Collection<String> result = new LinkedHashSet<String>(availableTargetNames.size()); Range<Integer> range = (Range<Integer>) shardingValue.getValueRange(); for (Integer i = range.lowerEndpoint(); i <= range.upperEndpoint(); i++) { for (String each : availableTargetNames) { if (each.endsWith(i % 2 + "")) { result.add(each); } } } return result; } }
UserSingleKeyTableShardingAlgorithm.java
package com.eshop.sharding.jdbc.algorithm; import java.util.Collection; import java.util.LinkedHashSet; import com.dangdang.ddframe.rdb.sharding.api.ShardingValue; import com.dangdang.ddframe.rdb.sharding.api.strategy.table.SingleKeyTableShardingAlgorithm; import com.google.common.collect.Range; public class UserSingleKeyTableShardingAlgorithm implements SingleKeyTableShardingAlgorithm<Integer>{ /** * sql 中 = 操作时,table的映射 */ public String doEqualSharding(Collection<String> tableNames, ShardingValue<Integer> shardingValue) { for (String each : tableNames) { if (each.endsWith(shardingValue.getValue() % 3 + "")) { return each; } } throw new IllegalArgumentException(); } /** * sql 中 in 操作时,table的映射 */ public Collection<String> doInSharding(Collection<String> tableNames, ShardingValue<Integer> shardingValue) { Collection<String> result = new LinkedHashSet<String>(tableNames.size()); for (Integer value : shardingValue.getValues()) { for (String tableName : tableNames) { if (tableName.endsWith(value % 3 + "")) { result.add(tableName); } } } return result; } /** * sql 中 between 操作时,table的映射 */ public Collection<String> doBetweenSharding(Collection<String> tableNames, ShardingValue<Integer> shardingValue) { Collection<String> result = new LinkedHashSet<String>(tableNames.size()); Range<Integer> range = (Range<Integer>) shardingValue.getValueRange(); for (Integer i = range.lowerEndpoint(); i <= range.upperEndpoint(); i++) { for (String each : tableNames) { if (each.endsWith(i % 3 + "")) { result.add(each); } } } return result; } }
5.事务管理:
新增Student的分库分表策略,具体见代码
事务接口实现类,UserServiceImpl
package com.eshop.sharding.jdbc.service.impl; import java.util.List; import javax.annotation.Resource; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Propagation; import org.springframework.transaction.annotation.Transactional; import com.eshop.sharding.jdbc.dao.StudentDao; import com.eshop.sharding.jdbc.dao.UserDao; import com.eshop.sharding.jdbc.domain.Student; import com.eshop.sharding.jdbc.domain.User; import com.eshop.sharding.jdbc.service.UserService; @Service @Transactional public class UserServiceImpl implements UserService { @Resource public UserDao userDao; @Resource public StudentDao studentDao; public boolean insert(User u) { return userDao.insert(u) > 0 ? true :false; } public List<User> findAll() { return userDao.findAll(); } public List<User> findByUserIds(List<Integer> ids) { return userDao.findByUserIds(ids); } @Transactional(propagation=Propagation.REQUIRED) public void transactionTestSucess() { User u = new User(); u.setUserId(13); u.setAge(25); u.setName("war3 1.27"); userDao.insert(u); Student student = new Student(); student.setStudentId(21); student.setAge(21); student.setName("hehe"); studentDao.insert(student); } @Transactional(propagation=Propagation.REQUIRED) public void transactionTestFailure() throws IllegalAccessException { User u = new User(); u.setUserId(13); u.setAge(25); u.setName("war3 1.27 good"); userDao.insert(u); Student student = new Student(); student.setStudentId(21); student.setAge(21); student.setName("hehe1"); studentDao.insert(student); throw new IllegalAccessException(); } }
测试类
package com.eshop.sharding.jdbc; import java.util.Arrays; import java.util.List; import javax.annotation.Resource; import org.junit.Assert; import org.junit.Test; import org.junit.runner.RunWith; import org.springframework.test.context.ContextConfiguration; import org.springframework.test.context.junit4.SpringJUnit4ClassRunner; import com.eshop.sharding.jdbc.domain.User; import com.eshop.sharding.jdbc.service.UserService; @RunWith(SpringJUnit4ClassRunner.class) @ContextConfiguration(locations = "classpath*:applicationContext.xml") public class ShardingJdbcMybatisTest { @Resource public UserService userService; @Test public void testUserInsert() { User u = new User(); //为=号时,分库规则shardingValue.getValue() % 2 + "" ,分表规则 shardingValue.getValue() % 3 + "" //u.setUserId(11); //11%2=1 11%3=2 sharding_1.t_user_2 u.setUserId(12); //12%2=0 12%3=0 sharding_0.t_user_0 //u.setUserId(13); //13%2=1 13%3=1 sharding_1.t_user_1 //u.setUserId(14); //14%2=0 14%3=2 sharding_0.t_user_2 u.setAge(25); u.setName("github"); Assert.assertEquals(userService.insert(u), true); } // @Test // public void testStudentInsert() { // Student student = new Student(); // student.setStudentId(21); // student.setAge(21); // student.setName("hehe"); // Assert.assertEquals(studentService.insert(student), true); // } @Test public void testFindAll(){ List<User> users = userService.findAll(); if(null != users && !users.isEmpty()){ for(User u :users){ System.out.println(u); } } } @Test public void testSQLIN(){ List<User> users = userService.findByUserIds(Arrays.asList(2,10,1)); if(null != users && !users.isEmpty()){ for(User u :users){ System.out.println(u); } } } @Test public void testTransactionTestSucess(){ userService.transactionTestSucess(); } @Test(expected = IllegalAccessException.class) public void testTransactionTestFailure() throws IllegalAccessException{ userService.transactionTestFailure(); } }
事务好像成问题
6.最新的基于rdb的写法
参考配置:https://github.com/dangdangdotcom/sharding-jdbc/blob/master/sharding-jdbc-example/sharding-jdbc-example-mybatis/src/main/resources/META-INF/mybatis/mysql/shardingContext.xml
http://blog.csdn.net/farrell_zeng/article/details/52957274
http://www.cnblogs.com/zwt1990/p/6762135.html
见工程:sharding-jdbc-mybatis-rdb-dxfl-demo
<rdb:table-rule logic-table="t_user" actual-tables="t_order_${0..2}" database-strategy="userDatabaseShardingStrategy" table-strategy="userTableShardingStrategy">
报错:Invalid bean definition with name 'shardingDataSource' defined in null: Could not resolve placeholder '0..2' in string value "t_student_${0..2}"
Cloud not resolve placeholder … in string value …异常的解决方法?
在读取配置文件时, <context:property-placeholder location="classpath:bp.properties" ignore-unresolvable="true" />
7.主从配置
8.分布式主键
http://blog.csdn.net/u012768474/article/details/52767520
http://dangdangdotcom.github.io/sharding-jdbc/02-guide/key-generator/
http://blog.csdn.net/tianyaleixiaowu/article/details/70242971
先看官方的说法,http://dangdangdotcom.github.io/sharding-jdbc/02-guide/id-generator/
传统数据库软件开发中,主键自动生成技术是基本需求。而各大数据库对于该需求也提供了相应的支持,比如MySQL的自增键。 对于MySQL而言,分库分表之后,不同表生成全局唯一的Id是非常棘手的问题。因为同一个逻辑表内的不同实际表之间的自增键是无法互相感知的, 这样会造成重复Id的生成。我们当然可以通过约束表生成键的规则来达到数据的不重复,但是这需要引入额外的运维力量来解决重复性问题,并使框架缺乏扩展性。
目前有许多第三方解决方案可以完美解决这个问题,比如UUID等依靠特定算法自生成不重复键,或者通过引入Id生成服务等。 但也正因为这种多样性导致了Sharding-JDBC如果强依赖于任何一种方案就会限制其自身的发展。
基于以上的原因,最终采用了以JDBC接口来实现对于生成Id的访问,而将底层具体的Id生成实现分离出来。
其实最终要解决的问题就是各库各表中的数据,主键不能重复。官方提供的statement什么的没看懂,我就直接用它提供的通用主键生成器来生成主键了。
1.提供了一个类IdGenerator,这个类能生成一个保证不重复的Long型数字,我们就用它做主键
<dependency> <groupId>com.dangdang</groupId> <artifactId>sharding-jdbc-self-id-generator</artifactId> <version>${sharding-jdbc.version}</version> </dependency>注:最新版本提供了该方法:1.4.2
2.在数据库中应该用大于等于64bit的数字类型的字段来保存该值,比如在MySQL中应该使用BIGINT。
其二进制表示形式包含四部分,从高位到低位分表为:1bit符号位(为0),41bit时间位,10bit工作进程位,12bit序列位。
用int转换会变成负数
可以新建类
package com.eshop.sharding.jdbc.idGenerator; import org.springframework.stereotype.Service; import com.dangdang.ddframe.rdb.sharding.id.generator.IdGenerator; import com.dangdang.ddframe.rdb.sharding.id.generator.self.CommonSelfIdGenerator; @Service public class IdGeneratorTool { public IdGenerator getIdGenerator() { return new CommonSelfIdGenerator(); } }
long id = idGenerator.getIdGenerator().generateId().longValue(); u.setId(id);
一些最佳实践的说明
1. 在设计库和表时优先考虑使用0,可以配合取余来使用
2.做主键的字段一般设计成数字型
3.SingleKeyTableShardingAlgorithm的类型当然也可以定义为String,问题是使用between时,不好用;
SingleKeyTableShardingAlgorithm的类型设置成Integer类型
4.在写分库分表规则时:
(shardingValue.getValue()!=null && each.endsWith( String.valueOf(shardingValue.getValue()).substring(0, 6)))
这种方式可取:String.valueOf(shardingValue.getValue())
这种方式不可取:shardingValue.getValue().toString()
非维度查询也可以
当你需要使用某个维度进行操作,可以带条件,否则别带
做法:在batis配置文件里设置<if test="orderId != null" >AND order_id = #{orderId,jdbcType=INTEGER} </if>
至今总结:sharding-jdbc:可以维度和非维度查询;带维度条件则在维度条件下获取;否则在全库全表获取数据聚合。
可以尝试:分页,排序等等
统计时:
异构数据库:比如跨库join;
全局表:比如跨库join
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