一.sharding jdbc简介(这里你可以不看)
首先,我要在这里先介绍一下sharding jdbc:
Sharding-JDBC定位为轻量级java框架,使用客户端直连数据库,以jar包形式提供服务,未使用中间层,无需额外部署,无其他依赖,DBA也无需改变原有的运维方式,可理解为增强版的JDBC驱动,旧代码迁移成本几乎为零。
它主要的功能:分库分表;读写分离; 柔性事务;分布式主键;兼容性;灵活多样的配置;分布式治理能力 (2.0新功能);
前两个功能无需多说,柔性事务主要表现在:最大努力送达型事务,TCC型事务(TBD);分布式主键也不需要多说,兼容性主要体现在:可适用于任何基于java的ORM框架,如:JPA, Hibernate, Mybatis, Spring JDBC Template或直接使用JDBC,可基于任何第三方的数据库连接池,如:DBCP, C3P0, BoneCP, Druid等,理论上可支持任意实现JDBC规范的数据库。目前支持MySQL,Oracle,SQLServer和PostgreSQL;灵活多样的配置主要支持这些配置Java,YAML,Inline表达式,Spring命名空间,Spring boot starter;分布式治理能力 : 配置集中化与动态化,可支持数据源、表与分片策略的动态切换(2.0.0.M1), 客户端的数据库治理,数据源失效自动切换(2.0.0.M2), 基于Open Tracing协议的APM信息输出(2.0.0.M3),分布式治理能力我也没有尝试过。
从sharding jdbc的官网文档中下载的demo,基本上都不能跑起来,而它的基本文档大部分都粘贴的是代码片段,虽然能理解它的意思,但是很难将这些代码拼接起来,我自己做的时候,也踩了很多坑,在网上搜索的例子很多都是基于当当网的sharding jdbc,基本上版本是到了1.5(在我使用的时候),我当时在使用的时候遇到一些问题,想加官网群,发现加不进去,就去找群主,加群主,并且询问为什么不让加讨论群,后来我才知道那个群主是张亮(当当网架构师,负责sharding jdbc的大牛),还好别人没有理我,太唐突了,后面自己也都把这些问题解决了。不过据说当当网的sharding jdbc抽离出来了,由Apache负责,所以:我的依赖从dangdang的
com.dangdang
sharding-jdbc-core
1.3.3
变为了:
io.shardingjdbc
sharding-jdbc-core
2.0.3
我当当网的sharding使用的版本比较低,遇到了一些问题,文章末尾会分享出来。
二.开始动手(这是正文)
废话已经说了那么多了,现在进入正题吧,如何进行sharding jdbc的分库分表,如有错误的地方,欢迎指正。
我使用的工具:编译器:IntelliJ IDEA; mysql管理工具:workbench;
1.我们先建立数据库和表(分别建了两个库两张表):
CREATE DATABASE `user_0` /*!40100 DEFAULT CHARACTER SET utf8 */;
CREATE TABLE `user_info_1` (
`user_id` bigint(19) NOT NULL,
`user_name` varchar(45) DEFAULT NULL,
`account` varchar(45) NOT NULL,
`password` varchar(45) DEFAULT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `user_info_0` (
`user_id` bigint(19) NOT NULL,
`user_name` varchar(45) DEFAULT NULL,
`account` varchar(45) NOT NULL,
`password` varchar(45) DEFAULT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE DATABASE `user_1` /*!40100 DEFAULT CHARACTER SET utf8 */;
CREATE TABLE `user_info_1` (
`user_id` bigint(19) NOT NULL,
`user_name` varchar(45) DEFAULT NULL,
`account` varchar(45) NOT NULL,
`password` varchar(45) DEFAULT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `user_info_0` (
`user_id` bigint(19) NOT NULL,
`user_name` varchar(45) DEFAULT NULL,
`account` varchar(45) NOT NULL,
`password` varchar(45) DEFAULT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
2.开始我们项目的建立,首先明确一点的,我们添加配置的顺序要有先后,思路要清晰,不然在你出错的时候,你都不知道朝哪个方向去思考,我们是spring boot+mybatis+sharding jdbc,我们首先是一个spring boot的项目,所以我们首先建立一个spring boot项目,你可以从https://start.spring.io这个网址去创建一个spring boot项目,也可以从idea编译器上:File->new->project
最后生成的pom文件:
4.0.0
com.example
demo
0.0.1-SNAPSHOT
jar
demo
Demo project for Spring Boot
org.springframework.boot
spring-boot-starter-parent
2.0.0.RELEASE
UTF-8
UTF-8
1.8
org.springframework.boot
spring-boot-starter-web
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.3.1
mysql
mysql-connector-java
runtime
org.springframework.boot
spring-boot-starter-test
test
io.shardingjdbc
sharding-jdbc-core
2.0.3
org.springframework.boot
spring-boot-devtools
true
com.alibaba
druid
1.1.3
commons-dbcp
commons-dbcp
1.4
mysql
mysql-connector-java
5.1.44
org.springframework.boot
spring-boot-maven-plugin
其中,spring-boot-devtools,commons-dbcp,druid,我感觉都是不需要的,我完成项目后也没对这些项目的依赖进行过滤。
这个时候,你可以测试一下,你的spring boot项目能否正常启动,可以,你就进入到下一步的配置当中。
3.mybatis的配置
首先,看看我的源码的目录结构:
我创建一个entity包(实体包),里面有一个UserInfo的类:
public class UserInfo {
/**
*
* This field was generated by MyBatis Generator.
* This field corresponds to the database column user_info.user_id
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
private Long userId;
/**
*
* This field was generated by MyBatis Generator.
* This field corresponds to the database column user_info.user_name
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
private String userName;
/**
*
* This field was generated by MyBatis Generator.
* This field corresponds to the database column user_info.account
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
private String account;
/**
*
* This field was generated by MyBatis Generator.
* This field corresponds to the database column user_info.password
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
private String password;
/**
* This method was generated by MyBatis Generator.
* This method returns the value of the database column user_info.user_id
*
* @return the value of user_info.user_id
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public Long getUserId() {
return userId;
}
/**
* This method was generated by MyBatis Generator.
* This method sets the value of the database column user_info.user_id
*
* @param userId the value for user_info.user_id
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public void setUserId(Long userId) {
this.userId = userId;
}
/**
* This method was generated by MyBatis Generator.
* This method returns the value of the database column user_info.user_name
*
* @return the value of user_info.user_name
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public String getUserName() {
return userName;
}
/**
* This method was generated by MyBatis Generator.
* This method sets the value of the database column user_info.user_name
*
* @param userName the value for user_info.user_name
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public void setUserName(String userName) {
this.userName = userName == null ? null : userName.trim();
}
/**
* This method was generated by MyBatis Generator.
* This method returns the value of the database column user_info.account
*
* @return the value of user_info.account
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public String getAccount() {
return account;
}
/**
* This method was generated by MyBatis Generator.
* This method sets the value of the database column user_info.account
*
* @param account the value for user_info.account
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public void setAccount(String account) {
this.account = account == null ? null : account.trim();
}
/**
* This method was generated by MyBatis Generator.
* This method returns the value of the database column user_info.password
*
* @return the value of user_info.password
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public String getPassword() {
return password;
}
/**
* This method was generated by MyBatis Generator.
* This method sets the value of the database column user_info.password
*
* @param password the value for user_info.password
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
}
然后我有一个mapper包(映射包),里面有一个映射类UserInfoMapper
import com.example.demo.entity.UserInfo;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserInfoMapper {
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table user_info
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
int insert(UserInfo record);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table user_info
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
int insertSelective(UserInfo record);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table user_info
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
UserInfo selectByPrimaryKey(Long userId);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table user_info
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
int updateByPrimaryKeySelective(UserInfo record);
/**
* This method was generated by MyBatis Generator.
* This method corresponds to the database table user_info
*
* @mbg.generated Tue Mar 13 23:47:19 CST 2018
*/
int updateByPrimaryKey(UserInfo record);
}
还有再resources目录下的mapper目录中的UserInfoMapper.xml
user_id, user_name, account, password
insert into user_info (user_id, user_name, account,
password)
values (#{userId,jdbcType=BIGINT}, #{userName,jdbcType=VARCHAR}, #{account,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR})
insert into user_info
user_id,
user_name,
account,
password,
#{userId,jdbcType=BIGINT},
#{userName,jdbcType=VARCHAR},
#{account,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR},
update user_info
user_name = #{userName,jdbcType=VARCHAR},
account = #{account,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR},
where user_id = #{userId,jdbcType=BIGINT}
update user_info
set user_name = #{userName,jdbcType=VARCHAR},
account = #{account,jdbcType=VARCHAR},
password = #{password,jdbcType=VARCHAR}
where user_id = #{userId,jdbcType=BIGINT}
按道理说,这样的配置应该就可以了,你写个测试代码试一试,能不能进行增删查改,应该是可以的,可我运气比较差,居然不行,所以我又加了一个mybatis-config.xml的配置,我不知道你们运行的结果怎么样,但是现在如果出问题,一定在mybatis上,所以问题搜索的范围就相对只有这一个模块
4.sharding jdbc的配置
当你mybatis调整好了的时候,这个时候就该加sharding jdbc的配置了,接下如果出问题,应该先朝sharding jdbc的方向去考虑.
从目录结构中我们可以看到,我有一个config包,我把我的配置都写在这里面的,首先,我们先实现我们的分库分表的策略
分库策略的类,DemoDatabaseShardingAlgorithm
package com.example.demo.config;
import com.google.common.collect.Range;
import io.shardingjdbc.core.api.algorithm.sharding.PreciseShardingValue;
import io.shardingjdbc.core.api.algorithm.sharding.standard.PreciseShardingAlgorithm;
import java.util.Collection;
import java.util.LinkedHashSet;
public class DemoDatabaseShardingAlgorithm implements PreciseShardingAlgorithm {
@Override
public String doSharding(Collection collection, PreciseShardingValue preciseShardingValue) {
for (String each : collection) {
if (each.endsWith(Long.parseLong(preciseShardingValue.getValue().toString()) % 2+"")) {
return each;
}
}
throw new IllegalArgumentException();
}
//public class DemoDatabaseShardingAlgorithm implements SingleKeyDatabaseShardingAlgorithm {
//
// @Override
// public String doEqualSharding(Collection databaseNames, ShardingValue shardingValue) {
//
// for (String each : databaseNames) {
// if (each.endsWith(Long.parseLong(shardingValue.getValue().toString()) % 2 + "")) {
// return each;
// }
// }
// throw new IllegalArgumentException();
// }
//
// @Override
// public Collection doInSharding(Collection databaseNames, ShardingValue shardingValue) {
// Collection result = new LinkedHashSet<>(databaseNames.size());
// for (Long value : shardingValue.getValues()) {
// for (String tableName : databaseNames) {
// if (tableName.endsWith(value % 2 + "")) {
// result.add(tableName);
// }
// }
// }
// return result;
// }
//
// @Override
// public Collection doBetweenSharding(Collection databaseNames, ShardingValue shardingValue) {
// Collection result = new LinkedHashSet<>(databaseNames.size());
// Range range = (Range) shardingValue.getValueRange();
// for (Long i = range.lowerEndpoint(); i <= range.upperEndpoint(); i++) {
// for (String each : databaseNames) {
// if (each.endsWith(i % 2 + "")) {
// result.add(each);
// }
// }
// }
// return result;
// }
}
使用io.shardingjdbc,就应该实现PreciseShardingAlgorithm接口,然后实现doSharding方法,对应SQL中的=, IN,还有RangeShardingAlgorithm接口中,对应SQL中的BETWEEN AND,因为我只需要=,in操作,所以只实现了PreciseShardingAlgorithm接口,你如果都需要,你可以都实现(千万不要忽略了一个类可以实现多个接口)。
如果你使用的当当网的sharding jdbc,那么你需要实现SingleKeyDatabaseShardingAlgorithm这个接口,实现其中的三个方法,我注释到的部分就是原来我用当当网的sharding jdbc的实现。
分表策略的类,DemoTableShardingAlgorithm
package com.example.demo.config;
import com.google.common.collect.Range;
import io.shardingjdbc.core.api.algorithm.sharding.PreciseShardingValue;
import io.shardingjdbc.core.api.algorithm.sharding.standard.PreciseShardingAlgorithm;
import java.util.Collection;
import java.util.LinkedHashSet;
//public class DemoTableShardingAlgorithm implements SingleKeyTableShardingAlgorithm {
public class DemoTableShardingAlgorithm implements PreciseShardingAlgorithm {
@Override
public String doSharding(Collection collection, PreciseShardingValue preciseShardingValue) {
for (String each : collection) {
if (each.endsWith(Long.parseLong(preciseShardingValue.getValue().toString()) % 2+"")) {
return each;
}
}
throw new IllegalArgumentException();
}
// private static Long timeNode1 = 13L;
//
// /**
// * select * from t_order where user_id = 11;类似这个意思
// * @param tableNames
// * @param shardingValue
// * @return
// */
// @Override
// public String doEqualSharding(Collection tableNames, ShardingValue shardingValue) {
// for (String each : tableNames) {
// Long currentTime = shardingValue.getValue()>>23;
// if (currentTime<=timeNode1){
// if (each.endsWith(shardingValue.getValue() % 2 + "")) {
// return each;
// }
// }else {
// if (each.endsWith(shardingValue.getValue() % 2 + "_1")) {
// return each;
// }
// }
// }
// throw new IllegalArgumentException();
//
// }
//
// /**
// * where user_id in (1,23,7)
// * @param tableNames
// * @param shardingValue
// * @return
// */
// @Override
// public Collection doInSharding(Collection tableNames, ShardingValue shardingValue) {
// Collection result = new LinkedHashSet<>(tableNames.size());
// for (Long value : shardingValue.getValues()) {
// for (String tableName : tableNames) {
// if (tableName.endsWith(value % 2 + "")) {
// result.add(tableName);
// }
// }
// }
// return result;
//
// }
//
// /**
// * where user_id between(1, 6)
// *
// * @param tableNames
// * @param shardingValue
// * @return
// */
// @Override
// public Collection doBetweenSharding(Collection tableNames, ShardingValue shardingValue) {
// Collection result = new LinkedHashSet<>(tableNames.size());
// Range range = (Range) shardingValue.getValueRange();
// for (Long i = range.lowerEndpoint(); i <= range.upperEndpoint(); i++) {
// for (String each : tableNames) {
// if (each.endsWith(i % 2 + "")) {
// result.add(each);
// }
// }
// }
// return result;
//
// }
}
与分库的步骤一致,也是需要实现PreciseShardingAlgorithm和RangeShardingAlgorithm两个接口的类。
剩下的就是最重要的部分,sharding jdbc的配置:
DataSourceConfig:
package com.example.demo.config;
import io.shardingjdbc.core.api.config.ShardingRuleConfiguration;
import io.shardingjdbc.core.api.config.TableRuleConfiguration;
import io.shardingjdbc.core.api.config.strategy.StandardShardingStrategyConfiguration;
import io.shardingjdbc.core.jdbc.core.datasource.ShardingDataSource;
import org.apache.commons.dbcp.BasicDataSource;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.SqlSessionTemplate;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import javax.sql.DataSource;
import java.sql.SQLException;
import java.util.*;
@Configuration
@MapperScan(basePackages = "com.example.demo.mapper", sqlSessionTemplateRef = "testSqlSessionTemplate")
public class DataSourceConfig {
/**
* 配置分库分表策略
*
* @return
* @throws SQLException
*/
@Bean(name = "shardingDataSource")
DataSource getShardingDataSource() throws SQLException {
ShardingRuleConfiguration shardingRuleConfig;
shardingRuleConfig = new ShardingRuleConfiguration();
shardingRuleConfig.getTableRuleConfigs().add(getUserTableRuleConfiguration());
shardingRuleConfig.getBindingTableGroups().add("user_info");
shardingRuleConfig.setDefaultDatabaseShardingStrategyConfig(new StandardShardingStrategyConfiguration("user_id", DemoDatabaseShardingAlgorithm.class.getName()));
shardingRuleConfig.setDefaultTableShardingStrategyConfig(new StandardShardingStrategyConfiguration("user_id", DemoTableShardingAlgorithm.class.getName()));
return new ShardingDataSource(shardingRuleConfig.build(createDataSourceMap()));
}
/**
* 设置表的node
* @return
*/
@Bean
TableRuleConfiguration getUserTableRuleConfiguration() {
TableRuleConfiguration orderTableRuleConfig = new TableRuleConfiguration();
orderTableRuleConfig.setLogicTable("user_info");
orderTableRuleConfig.setActualDataNodes("user_${0..1}.user_info_${0..1}");
orderTableRuleConfig.setKeyGeneratorColumnName("user_id");
return orderTableRuleConfig;
}
/**
* 需要手动配置事务管理器
*
* @param shardingDataSource
* @return
*/
@Bean
public DataSourceTransactionManager transactitonManager(DataSource shardingDataSource) {
return new DataSourceTransactionManager(shardingDataSource);
}
@Bean
@Primary
public SqlSessionFactory sqlSessionFactory(DataSource shardingDataSource) throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(shardingDataSource);
bean.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/*.xml"));
return bean.getObject();
}
@Bean
@Primary
public SqlSessionTemplate testSqlSessionTemplate(SqlSessionFactory sqlSessionFactory) throws Exception {
return new SqlSessionTemplate(sqlSessionFactory);
}
private Map createDataSourceMap() {
Map result = new HashMap<>();
result.put("user_0", createDataSource("user"));
result.put("user_1", createDataSource("user_1"));
return result;
}
private DataSource createDataSource(final String dataSourceName) {
BasicDataSource result = new BasicDataSource();
result.setDriverClassName(com.mysql.jdbc.Driver.class.getName());
result.setUrl(String.format("jdbc:mysql://localhost:3306/%s", dataSourceName));
result.setUsername("root");
result.setPassword("123456");
return result;
}
}
当你遇到一个问题:意思差不多是,需要一个数据源,但是发现好几个,你可以在
getShardingDataSource()这个方法上添加注解:@Primary,设置默认数据源
还有一个重中之重的部分,在Applicatian这个启动类中:加上注解
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
@EnableTransactionManagement(proxyTargetClass = true)
主要是为了防止代码的自动配置
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.transaction.annotation.EnableTransactionManagement;
@SpringBootApplication
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
@EnableTransactionManagement(proxyTargetClass = true)
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
5.测试
我写了一个测试服务和一个测试类
测试服务:DemoService
package com.example.demo.service;
import com.example.demo.entity.UserInfo;
import com.example.demo.mapper.UserInfoMapper;
import groovy.util.logging.Slf4j;
import io.shardingjdbc.core.api.HintManager;
import io.shardingjdbc.core.hint.HintManagerHolder;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Slf4j
@Service
public class DemoService {
@Resource
UserInfoMapper userInfoMapper;
public static Long userId = 150L;
public void demo() {
System.out.println("Insert--------------");
for (int i = 1; i <= 10; i++) {
UserInfo userInfo = new UserInfo();
userInfo.setUserId(userId);
userInfo.setAccount("Account" + i);
userInfo.setPassword("pass" + i);
userInfo.setUserName("name" + i);
userId++;
if(i==3){
HintManagerHolder.clear();
HintManager hintManager = HintManager.getInstance();
hintManager.addDatabaseShardingValue("user_info", "user_id", 3L);
hintManager.addTableShardingValue("user_info", "user_id", 3L);
System.out.println(userId);
}
userInfoMapper.insert(userInfo);
//
//
}
System.out.println("over..........");
}
}
测试类DemoApplicationTests
package com.example.demo;
import com.example.demo.entity.UserInfo;
import com.example.demo.mapper.UserInfoMapper;
import com.example.demo.service.DemoService;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;
import java.sql.Timestamp;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
@RunWith(SpringRunner.class)
@SpringBootTest
public class DemoApplicationTests {
@Resource
UserInfoMapper userInfoMaper;
@Resource
DemoService demoService;
@Test
public void contextLoads() {
demoService.demo();
}
}
三.遇到的问题
1.首先,我试着用xml的形式来配置,但是一直没有成功,好像是sharding jdbc对xml的支持不是很好,老点的版本是这样,但是新版的应该有很大的改善;
2.在我进行测试的时候,使用的当当网1.3版本的sharding jdbc,一直提示我在sql语句的带上分片键的值,我确实是带上的,我的代码我确定没有问题,网上也没搜到答案,我就根据报错debug sharding jdbc的源码,经过一天的努力,我发现问题了
:是因为我使用的sharding jdbc版本不是1.5以上的版本,所以不是sharding jdbc自带的SQL解析引擎,所以处理SQL的时候使用druid的parameter属性进行SQL中的参数存储,而在高版本的druid中,将parameter替换成inputParameter,而我使用的sharding jdbc仍是使用的parmeter取出参数,所以一直找不到分片键值,升级sharding版本或者降低druid版本就可以了
看图你们就懂了:
这是两个新版本和旧版本的druid中setParameters方法的源码,看出不同了吧,就是因为这个,我的测试一直报错。
世上无难事,只要肯攀登。
我的愿望是:代码无bug
我的代码的github地址: https://github.com/DragonMat/sharding-jdbc-demo.git