【快速使用ShardingJDBC的哈希分片策略进行分表】

博主介绍

我是廖志伟，一名Java开发工程师、Java领域优质创作者、CSDN博客专家、51CTO专家博主、阿里云专家博主、清华大学出版社签约作者、产品软文专业写手、技术文章评审老师、问卷调查设计师、个人社区创始人、开源项目贡献者。跑过十五公里、徒步爬过衡山、有过三个月减肥20斤的经历、是个喜欢躺平的狠人。

拥有多年一线研发和团队管理经验，研究过主流框架的底层源码(Spring、SpringBoot、Spring MVC、SpringCould、Mybatis、Dubbo、Zookeeper)，消息中间件底层架构原理(RabbitMQ、RockerMQ、Kafka)、Redis缓存、MySQL关系型数据库、 ElasticSearch全文搜索、MongoDB非关系型数据库、Apache ShardingSphere分库分表读写分离、设计模式、领域驱动DDD、Kubernetes容器编排等。

有过从0到1的项目高并发项目开发与管理经验，对JVM调优、MySQL调优、Redis调优 、ElasticSearch调优、消息中间件调优、系统架构调优都有着比较全面的实战经验。

有过云端搭建服务器环境，自动化部署CI/CD，弹性伸缩扩容服务器（最高200台），了解过秒级部署（阿里云的ACK和华为云的云容器引擎CCE）流程，能独立开发和部署整个后端服务，有过分库分表的实战经验。

经过多年在CSDN创作上千篇文章的经验积累，我已经拥有了不错的写作技巧，与清华大学出版社签下了四本书籍的合约，并将陆续在明年出版。这些书籍包括了基础篇、进阶篇、架构篇的《Java项目实战—深入理解大型互联网企业通用技术》，以及《解密程序员的思维密码–沟通、演讲、思考的实践》。具体出版计划会根据实际情况进行调整，希望各位读者朋能够多多支持！

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阅读前，快速浏览目录和章节概览可帮助了解文章结构、内容和作者的重点。了解自己希望从中获得什么样的知识或经验是非常重要的。建议在阅读时做笔记、思考问题、自我提问，以加深理解和吸收知识。

在这个美好的时刻，本人不再啰嗦废话，现在毫不拖延地进入文章所要讨论的主题。接下来，我将为大家呈现正文内容。

本文内容

1.引入maven依赖

在pom.xml中添加依赖

<!-- Maven 构建配置 -->
<build>
    <!-- 插件列表 -->
    <plugins>
        <!-- Maven 编译插件 -->
        <plugin>
            <!-- 插件所在 groupId -->
            <groupId>org.apache.maven.plugins</groupId>
            <!-- 插件所在 artifactId -->
            <artifactId>maven-compiler-plugin</artifactId>
            <!-- 插件配置 -->
            <configuration>
                <!-- 源码编译版本 -->
                <source>8</source>
                <!-- 目标编译版本 -->
                <target>8</target>
            </configuration>
        </plugin>
    </plugins>
</build>

<!-- Maven 依赖管理配置 -->
<dependencyManagement>
    <!-- 依赖列表 -->
    <dependencies>
        <!-- Spring Boot 依赖管理 -->
        <dependency>
            <!-- 依赖所在 groupId -->
            <groupId>org.springframework.boot</groupId>
            <!-- 依赖所在 artifactId -->
            <artifactId>spring-boot-dependencies</artifactId>
            <!-- 依赖版本 -->
            <version>2.3.1.RELEASE</version>
            <!-- 依赖类型 -->
            <type>pom</type>
            <!-- 依赖范围 -->
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<!-- 项目依赖列表 -->
<dependencies>
    <!-- 分库分表组件 Sharding JDBC -->
    <dependency>
        <!-- 依赖所在 groupId -->
        <groupId>org.apache.shardingsphere</groupId>
        <!-- 依赖所在 artifactId -->
        <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
        <!-- 依赖版本 -->
        <version>4.1.1</version>
    </dependency>
    <!-- Spring Boot 核心依赖 -->
    <dependency>
        <!-- 依赖所在 groupId -->
        <groupId>org.springframework.boot</groupId>
        <!-- 依赖所在 artifactId -->
        <artifactId>spring-boot-starter</artifactId>
    </dependency>
    <!-- Spring Boot 测试依赖 -->
    <dependency>
        <!-- 依赖所在 groupId -->
        <groupId>org.springframework.boot</groupId>
        <!-- 依赖所在 artifactId -->
        <artifactId>spring-boot-starter-test</artifactId>
    </dependency>
    <!-- 数据源连接池组件 Druid -->
    <dependency>
        <!-- 依赖所在 groupId -->
        <groupId>com.alibaba</groupId>
        <!-- 依赖所在 artifactId -->
        <artifactId>druid</artifactId>
        <!-- 依赖版本 -->
        <version>1.1.22</version>
    </dependency>
    <!-- MySQL 驱动依赖 -->
    <dependency>
        <!-- 依赖所在 groupId -->
        <groupId>mysql</groupId>
        <!-- 依赖所在 artifactId -->
        <artifactId>mysql-connector-java</artifactId>
    </dependency>
    <!-- MyBatis-Plus 集成依赖 -->
    <dependency>
        <!-- 依赖所在 groupId -->
        <groupId>com.baomidou</groupId>
        <!-- 依赖所在 artifactId -->
        <artifactId>mybatis-plus-boot-starter</artifactId>
        <!-- 依赖版本 -->
        <version>3.0.5</version>
    </dependency>
</dependencies>

2.启动类上添加注解@MapperScan

扫描对应的mapper路径

@MapperScan("com.example.shardingDemo.mapper")
@SpringBootApplication
public class ShardingJDBCApplication {
    public static void main(String[] args) {
        SpringApplication.run(ShardingJDBCApplication.class,args);
    }
}

3.添加application.properties配置

# 哈希分片策略

# 设置数据源名称为 m1
spring.shardingsphere.datasource.names=m1
# 设置数据源类型为 Druid 数据源
spring.shardingsphere.datasource.m1.type=com.alibaba.druid.pool.DruidDataSource
# 设置数据源驱动为 MySQL 的 JDBC 驱动
spring.shardingsphere.datasource.m1.driver-class-name=com.mysql.cj.jdbc.Driver
# 设置数据源连接 URL，连接本地 MySQL 数据库的 coursedb 库
spring.shardingsphere.datasource.m1.url=jdbc:mysql://192.168.122.128:3306/masterdemo?serverTimezone=GMT%2B8
# 设置连接数据库所需的用户名和密码
spring.shardingsphere.datasource.m1.username=root
spring.shardingsphere.datasource.m1.password=bfb8f36cc2616995
# 设置分片表的实际数据节点，对应两个数据表：m1.t_course_1 和 m1.t_course_2
spring.shardingsphere.sharding.tables.course.actual-data-nodes=m1.t_course_$->{1..2}
# 设置分片键为 cid
spring.shardingsphere.sharding.tables.course.key-generator.column=cid
# 设置分布式 ID 生成算法为 SNOWFLAKE 算法，worker ID 为 1
spring.shardingsphere.sharding.tables.course.key-generator.type=SNOWFLAKE
# Spring Boot 应用配置项：ShardingSphere 分库分表配置之课程表的主键生成策略配置项，属性名: worker.id，属性值: 1 (表示该应用程序所使用的 Snowflake 算法的工作节点 ID 为 1)
spring.shardingsphere.sharding.tables.course.key-generator.props.worker.id=1
# 设置分表算法为 inline 分片算法，分片列为 cid，分片规则为课程编号为奇数的记录在 m1.t_course_1 表中，课程编号为偶数的记录在 m1.t_course_2 表中
spring.shardingsphere.sharding.tables.course.table-strategy.inline.sharding-column=cid
# table-strategy.inline：表示使用内联表达式的分片策略。lgorithm-expression：表示表名生成算法表达式。t_course_$->{cid%2+1}：表示生成的表名，即t_course_后面接下标为(cid%2+1)的表。
# cid是表中的一个自增主键，%2表示对2取余数，+1表示取余结果加1，即cid值为偶数进入到t_course_1表，cid值为奇数进入到t_course_2表。
spring.shardingsphere.sharding.tables.course.table-strategy.inline.algorithm-expression=t_course_$->{cid%2+1}
# 设置 SQL 显示开启，方便调试
spring.shardingsphere.props.sql.show=true
# 允许覆盖 Bean 定义，用于调试时快速更新配置
spring.main.allow-bean-definition-overriding=true

4.普通的自定义实体类

public class Course {
    private Long cid;
    private String cname;
    private Long userId;
    private String cstatus;
    //省略get/set方法了

5.写个测试类验证一下

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.example.shardingDemo.entity.Course;
import com.example.shardingDemo.entity.Dict;
import com.example.shardingDemo.entity.User;
import com.example.shardingDemo.mapper.CourseMapper;
import com.example.shardingDemo.mapper.DictMapper;
import com.example.shardingDemo.mapper.UserMapper;
import org.apache.shardingsphere.api.hint.HintManager;
import org.junit.Test;
import org.junit.jupiter.api.Tags;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import javax.annotation.Resource;
import java.util.List;

@RunWith(SpringRunner.class)
@SpringBootTest
public class ShardingJDBCTest {
    @Resource
    CourseMapper courseMapper;

    @Test
    public void addCourse(){
        for(int i = 0 ; i < 10 ; i ++){
            Course c = new Course();
            c.setCid(Long.valueOf(i));
            c.setCname("shardingsphere");
            c.setUserId(Long.valueOf(""+(1000+i)));
            c.setCstatus("1");
            courseMapper.insert(c);
        }
    }
}

6.控制台打印的日志

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.1.RELEASE)

2023-11-08 18:02:14.029  INFO 11092 --- [           main] c.e.a.ShardingJDBCTest                   : Starting ShardingJDBCTest on WIN-20230222ULN with PID 11092 (started by Administrator in E:\WarkSpace\基础篇书籍\第8章\apache-shardingsphere-demo)
2023-11-08 18:02:14.032  INFO 11092 --- [           main] c.e.a.ShardingJDBCTest                   : No active profile set, falling back to default profiles: default
2023-11-08 18:02:14.414  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'stringToNoneShardingStrategyConfigurationConverter' of type [org.apache.shardingsphere.spring.boot.converter.StringToNoneShardingStrategyConfigurationConverter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.422  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere.sharding-org.apache.shardingsphere.shardingjdbc.spring.boot.sharding.SpringBootShardingRuleConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.sharding.SpringBootShardingRuleConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.422  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere.masterslave-org.apache.shardingsphere.shardingjdbc.spring.boot.masterslave.SpringBootMasterSlaveRuleConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.masterslave.SpringBootMasterSlaveRuleConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.426  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere.encrypt-org.apache.shardingsphere.shardingjdbc.spring.boot.encrypt.SpringBootEncryptRuleConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.encrypt.SpringBootEncryptRuleConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.426  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere.shadow-org.apache.shardingsphere.shardingjdbc.spring.boot.shadow.SpringBootShadowRuleConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.shadow.SpringBootShadowRuleConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.430  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere-org.apache.shardingsphere.shardingjdbc.spring.boot.common.SpringBootPropertiesConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.common.SpringBootPropertiesConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.549  INFO 11092 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration$$EnhancerBySpringCGLIB$$f2dcf3ef] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 18:02:14.736  INFO 11092 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} inited
2023-11-08 18:02:15.200  INFO 11092 --- [           main] o.a.s.core.log.ConfigurationLogger       : ShardingRuleConfiguration:
tables:
  course:
    actualDataNodes: m1.t_course_$->{1..2}
    keyGenerator:
      column: cid
      props:
        worker.id: '1'
      type: SNOWFLAKE
    logicTable: course
    tableStrategy:
      inline:
        algorithmExpression: t_course_$->{cid%2+1}
        shardingColumn: cid

2023-11-08 18:02:15.200  INFO 11092 --- [           main] o.a.s.core.log.ConfigurationLogger       : Properties:
sql.show: 'true'

2023-11-08 18:02:15.208  INFO 11092 --- [           main] ShardingSphere-metadata                  : Loading 1 logic tables' meta data.
2023-11-08 18:02:15.254  INFO 11092 --- [           main] ShardingSphere-metadata                  : Loading 8 tables' meta data.
2023-11-08 18:02:15.285  INFO 11092 --- [           main] ShardingSphere-metadata                  : Meta data load finished, cost 85 milliseconds.
 _ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ 
     /               |         
                        3.0.5 
2023-11-08 18:02:15.391  WARN 11092 --- [           main] c.b.m.core.toolkit.TableInfoHelper       : Warn: Could not find @TableId in Class: com.example.apacheshardingspheredemo.entity.Course.
2023-11-08 18:02:15.466  WARN 11092 --- [           main] c.b.m.core.toolkit.TableInfoHelper       : Warn: Could not find @TableId in Class: com.example.apacheshardingspheredemo.entity.Dict.
2023-11-08 18:02:15.479  WARN 11092 --- [           main] c.b.m.core.toolkit.TableInfoHelper       : Warn: Could not find @TableId in Class: com.example.apacheshardingspheredemo.entity.User.
2023-11-08 18:02:15.577  INFO 11092 --- [           main] c.e.a.ShardingJDBCTest                   : Started ShardingJDBCTest in 1.698 seconds (JVM running for 2.242)
2023-11-08 18:02:15.949  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.949  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@5ee6fdc4), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@5ee6fdc4, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[0, shardingsphere, 1000, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[0])])
2023-11-08 18:02:15.949  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_1  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [0, shardingsphere, 1000, 1]
2023-11-08 18:02:15.966  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.966  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@43fd77d8), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@43fd77d8, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[1, shardingsphere, 1001, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[1])])
2023-11-08 18:02:15.966  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_2  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [1, shardingsphere, 1001, 1]
2023-11-08 18:02:15.966  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.966  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@32ba5c65), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@32ba5c65, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[2, shardingsphere, 1002, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[2])])
2023-11-08 18:02:15.966  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_1  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [2, shardingsphere, 1002, 1]
2023-11-08 18:02:15.971  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.971  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@702f4124), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@702f4124, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[3, shardingsphere, 1003, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[3])])
2023-11-08 18:02:15.971  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_2  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [3, shardingsphere, 1003, 1]
2023-11-08 18:02:15.975  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.975  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@22ff1372), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@22ff1372, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[4, shardingsphere, 1004, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[4])])
2023-11-08 18:02:15.975  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_1  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [4, shardingsphere, 1004, 1]
2023-11-08 18:02:15.975  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.975  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@4d825dbe), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@4d825dbe, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[5, shardingsphere, 1005, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[5])])
2023-11-08 18:02:15.975  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_2  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [5, shardingsphere, 1005, 1]
2023-11-08 18:02:15.979  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.979  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@63814bbe), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@63814bbe, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[6, shardingsphere, 1006, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[6])])
2023-11-08 18:02:15.979  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_1  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [6, shardingsphere, 1006, 1]
2023-11-08 18:02:15.983  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.983  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@70b196d3), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@70b196d3, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[7, shardingsphere, 1007, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[7])])
2023-11-08 18:02:15.983  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_2  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [7, shardingsphere, 1007, 1]
2023-11-08 18:02:15.983  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.983  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@72001c71), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@72001c71, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[8, shardingsphere, 1008, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[8])])
2023-11-08 18:02:15.983  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_1  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [8, shardingsphere, 1008, 1]
2023-11-08 18:02:15.987  INFO 11092 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO course  ( cid,
cname,
user_id,
cstatus )  VALUES  ( ?,
?,
?,
? )
2023-11-08 18:02:15.987  INFO 11092 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@7ab1ad9, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@7d90644f), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@7d90644f, columnNames=[cid, cname, user_id, cstatus], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=64, stopIndex=64, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=67, stopIndex=67, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=70, stopIndex=70, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=73, stopIndex=73, parameterMarkerIndex=3)], parameters=[9, shardingsphere, 1009, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=cid, generated=false, generatedValues=[9])])
2023-11-08 18:02:15.987  INFO 11092 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_course_2  ( cid,
cname,
user_id,
cstatus )  VALUES  (?, ?, ?, ?) ::: [9, shardingsphere, 1009, 1]
2023-11-08 18:02:15.995  INFO 11092 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closing ...
2023-11-08 18:02:15.995  INFO 11092 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed
Disconnected from the target VM, address: '127.0.0.1:52128', transport: 'socket'

7.观察一下数据库的数据

course_1表的数据如图下所示：

可以发现course_1表的cid都是偶数。

course_2表的数据如图所示：

可以发现course_2表的cid都是奇数。

8.maven的setting文件

为了避免部分同学下载依赖包不一致导致maven依赖下载不下来，我这里给上自己的配置文件，代码如下所示：

<?xml version="1.0" encoding="UTF-8"?>
<!-- Maven 的配置文件 -->
<settings xmlns="http://maven.apache.org/SETTINGS/1.1.0" 
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.1.0
        http://maven.apache.org/xsd/settings-1.1.0.xsd">
  <!-- 设置本地仓库的路径 -->
  <localRepository>D:\Java\ReMaven</localRepository>
  <!-- 设置镜像 -->
  <mirrors>
  	<mirror>
      <id>central</id>
      <url>https://repo1.maven.org/maven2/</url>
      <mirrorOf>*</mirrorOf>
    </mirror>
    <!-- 定义一个镜像 -->
    <!-- <mirror>
      <id>aliyunmaven</id> 
      <name>Alibaba Maven Mirror</name> 
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url> 
      <mirrorOf>central</mirrorOf> 
    </mirror>
	-->
	<mirror>
	  <id>aliyunmaven</id><!-- 镜像的id -->
	  <mirrorOf>*</mirrorOf><!-- 镜像代理的仓库id，这里将中央仓库的地址替换为阿里云的地址 -->
	  <name>阿里云公共仓库</name><!-- 镜像的名称 -->
	  <url>https://maven.aliyun.com/repository/public</url><!-- 镜像的地址 -->
	</mirror>
  </mirrors>
  <!-- 设置代理 -->
  <proxies></proxies>
  <!-- 设置私有仓库的认证信息 -->
  <servers></servers>
  <!-- 定义构建时添加的环境参数 -->
  <profiles>
    <!-- 定义一个profile -->
    <profile>
      <id>jdk-1.8</id> <!-- profile的id -->
      <activation> <!-- 激活条件 -->
        <activeByDefault>true</activeByDefault> <!-- 默认激活 -->
        <jdk>1.8</jdk> <!-- 使用的JDK版本 -->
      </activation>
      <properties> <!-- 定义环境变量 -->
        <maven.compiler.source>1.8</maven.compiler.source> <!-- 编译代码的源版本 -->
        <maven.compiler.target>1.8</maven.compiler.target> <!-- 编译代码的目标版本 -->
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <!-- 项目源码的编码方式 -->
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <!-- 项目输出的编码方式 -->
        <java.version>1.8</java.version> <!-- 使用的Java版本 -->
      </properties>
    </profile>
  </profiles>
  <!-- 设置默认激活的环境 -->
  <activeProfiles>
    <activeProfile>jdk-1.8</activeProfile> <!-- 默认激活的profile -->
  </activeProfiles>
</settings>

9.视频演示

这里提供一个视频演示，简单讲解一下，视频发布在哔哩哔哩平台上。

快速使用ShardingJDBC的哈希分片策略进行分表

文章总结

对本篇文章进行总结：

以上就是今天要讲的内容，阅读结束后，反思和总结所学内容，并尝试应用到现实中，有助于深化理解和应用知识。与朋友或同事分享所读内容，讨论细节并获得反馈，也有助于加深对知识的理解和吸收。

如果您需要转载或者搬运这篇文章的话，非常欢迎您私信我哦~

希望各位读者大大多多支持用心写文章的博主，现在时代变了， 信息爆炸，酒香也怕巷子深，博主真的需要大家的帮助才能在这片海洋中继续发光发热，所以，赶紧动动你的小手，点波关注❤️，点波赞，点波收藏⭐，甚至点波评论✍️，都是对博主最好的支持和鼓励！

• 博客主页： 我是廖志伟
• 开源项目：java_wxid
• 哔哩哔哩：我是廖志伟
• 个人社区：幕后大佬
• 个人微信号： SeniorRD
• 微信号二维码：

博主目标

• 程序开发这条路不能停，停下来容易被淘汰掉，吃不了自律的苦，就要受平庸的罪，持续的能力才能带来持续的自信。我本是一个很普通的程序员，放在人堆里，除了与生俱来的盛世美颜，就剩180的大高个了，就是我这样的一个人，默默写博文也有好多年了。
• 有句老话说的好，牛逼之前都是傻逼式的坚持，希望自己可以通过大量的作品、时间的积累、个人魅力、运气、时机，可以打造属于自己的技术影响力。
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• 这个目标的实现需要不懈的努力和持续的成长，但我必须努力追求。因为我知道，只有成为这样的人才，我才能在职业生涯中不断前进并为企业的发展带来真正的价值。在这个不断变化的时代，我们必须随时准备好迎接挑战，不断学习和探索新的领域，才能不断地向前推进。我坚信，只要我不断努力，我一定会达到自己的目标。

有需要对自己进行综合性评估，进行职业方向规划，我可以让技术大牛帮你模拟面试、针对性的指导、传授面试技巧、简历优化、进行技术问题答疑等服务。

可访问：https://java_wxid.gitee.io/tojson/