【快速使用ShardingJDBC的哈希分片策略进行分库分表】

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🌟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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📚前面提到过【快速使用ShardingJDBC的哈希分片策略进行分表】，接下来就需要对其进行分库了。

🌾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

# 哈希分片策略分库分表
# 设置数据源名称为 m1
spring.shardingsphere.datasource.names=m1,m2
# 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 userdb 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
# 设置数据源名称为 m2
spring.shardingsphere.datasource.m2.type=com.alibaba.druid.pool.DruidDataSource
spring.shardingsphere.datasource.m2.driver-class-name=com.mysql.cj.jdbc.Driver
spring.shardingsphere.datasource.m2.url=jdbc:mysql://192.168.122.128:3306/masterdemo2?serverTimezone=GMT%2B8
spring.shardingsphere.datasource.m2.username=root
spring.shardingsphere.datasource.m2.password=bfb8f36cc2616995
# 设置分片表的实际数据节点，对应两个数据表：m1.t_user_1 和 m1.t_user_2
spring.shardingsphere.sharding.tables.user.actual-data-nodes=m$->{1..2}.t_user_$->{1..2}
# 设置分片键为 user_id
spring.shardingsphere.sharding.tables.user.key-generator.column=user_id
# 设置分布式 ID 生成算法为 SNOWFLAKE 算法，worker ID 为 1
spring.shardingsphere.sharding.tables.user.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.user.key-generator.props.worker.id=1
# 设置分表算法为 inline 分片算法，分片列为 user_id，分片规则为课程编号为奇数的记录在 m1.t_user_1 表中，课程编号为偶数的记录在 m1.t_user_2 表中
spring.shardingsphere.sharding.tables.user.table-strategy.inline.sharding-column=user_id
# 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_user_$->{user_id%2+1}：表示生成的表名，即t_user_后面接下标为(user_id%2+1)的表。
# user_id是表中的一个自增主键，%2表示对2取余数，+1表示取余结果加1，即user_id值为偶数进入到t_user_1表，user_id值为奇数进入到t_user_2表。
spring.shardingsphere.sharding.tables.user.table-strategy.inline.algorithm-expression=t_user_$->{user_id%2+1}
# 使用 Spring 和 ShardingSphere 进行数据库分片，将 user 表根据 user_id 字段进行分片,数据库策略为 inline，即使用算法表达式进行分片
spring.shardingsphere.sharding.tables.user.database-strategy.inline.sharding-column=user_id
# 用户 ID 对2取余再加1，结果为1或2，根据结果选择数据库 m1 或 m2 进行存储
spring.shardingsphere.sharding.tables.user.database-strategy.inline.algorithm-expression=m$->{user_id%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

import lombok.Data;
@Data
public class User {private int userId;private String userName;private String status;private int age;
}

🍊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 {@ResourceCourseMapper courseMapper;@ResourceDictMapper dictMapper;@ResourceUserMapper userMapper;@Testpublic void addUser(){for(int i = 0 ; i < 10 ; i ++){User user = new User();user.setUserId(i);user.setUserName("张三"+i);user.setAge(i);user.setStatus("1");userMapper.insert(user);}}
}

🍊6.控制台打印的日志

  .   ____          _            __ _ _/\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \\\/  ___)| |_)| | | | | || (_| |  ) ) ) )'  |____| .__|_| |_|_| |_\__, | / / / /=========|_|==============|___/=/_/_/_/:: Spring Boot ::        (v2.3.1.RELEASE)2023-11-08 19:05:14.284  INFO 20848 --- [           main] c.e.a.ShardingJDBCTest                   : Starting ShardingJDBCTest on WIN-20230222ULN with PID 20848 (started by Administrator in E:\WarkSpace\基础篇书籍\第8章\apache-shardingsphere-demo)
2023-11-08 19:05:14.285  INFO 20848 --- [           main] c.e.a.ShardingJDBCTest                   : No active profile set, falling back to default profiles: default
2023-11-08 19:05:14.668  INFO 20848 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'stringToNoneShardingStrategyConfigurationConverter' of type [org.apache.shardingsphere.spring.boot.converter.StringToNoneShardingStrategyConfigurationConverter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 19:05:14.675  INFO 20848 --- [           main] trationDelegate$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 19:05:14.678  INFO 20848 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere.masterslave-org.apache.shardingsphere.shardingjdbc.spring.boot.masterslave.SpringBootMasterSlaveRuleConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.masterslave.SpringBootMasterSlaveRuleConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 19:05:14.680  INFO 20848 --- [           main] trationDelegate$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 19:05:14.682  INFO 20848 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'spring.shardingsphere.shadow-org.apache.shardingsphere.shardingjdbc.spring.boot.shadow.SpringBootShadowRuleConfigurationProperties' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.shadow.SpringBootShadowRuleConfigurationProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 19:05:14.685  INFO 20848 --- [           main] trationDelegate$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 19:05:14.811  INFO 20848 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration' of type [org.apache.shardingsphere.shardingjdbc.spring.boot.SpringBootConfiguration$$EnhancerBySpringCGLIB$$bfc54c27] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2023-11-08 19:05:14.990  INFO 20848 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} inited
2023-11-08 19:05:15.410  INFO 20848 --- [           main] com.alibaba.druid.pool.DruidDataSource   : {dataSource-2} inited
2023-11-08 19:05:15.462  INFO 20848 --- [           main] o.a.s.core.log.ConfigurationLogger       : ShardingRuleConfiguration:
tables:user:actualDataNodes: m$->{1..2}.t_user_$->{1..2}databaseStrategy:inline:algorithmExpression: m$->{user_id%2+1}shardingColumn: user_idkeyGenerator:column: user_idprops:worker.id: '1'type: SNOWFLAKElogicTable: usertableStrategy:inline:algorithmExpression: t_user_$->{user_id%2+1}shardingColumn: user_id2023-11-08 19:05:15.462  INFO 20848 --- [           main] o.a.s.core.log.ConfigurationLogger       : Properties:
sql.show: 'true'2023-11-08 19:05:15.471  INFO 20848 --- [           main] ShardingSphere-metadata                  : Loading 1 logic tables' meta data.
2023-11-08 19:05:15.520  INFO 20848 --- [           main] ShardingSphere-metadata                  : Meta data load finished, cost 58 milliseconds._ _   |_  _ _|_. ___ _ |    _ 
| | |\/|_)(_| | |_\  |_)||_|_\ /               |         3.0.5 
2023-11-08 19:05:15.618  WARN 20848 --- [           main] c.b.m.core.toolkit.TableInfoHelper       : Warn: Could not find @TableId in Class: com.example.apacheshardingspheredemo.entity.Course.
2023-11-08 19:05:15.687  WARN 20848 --- [           main] c.b.m.core.toolkit.TableInfoHelper       : Warn: Could not find @TableId in Class: com.example.apacheshardingspheredemo.entity.Dict.
2023-11-08 19:05:15.699  WARN 20848 --- [           main] c.b.m.core.toolkit.TableInfoHelper       : Warn: Could not find @TableId in Class: com.example.apacheshardingspheredemo.entity.User.
2023-11-08 19:05:15.786  INFO 20848 --- [           main] c.e.a.ShardingJDBCTest                   : Started ShardingJDBCTest in 1.657 seconds (JVM running for 2.159)
2023-11-08 19:05:16.150  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.150  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@63e70bf9), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@63e70bf9, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[0, 张三0, 1, 0])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[0])])
2023-11-08 19:05:16.150  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_user_1  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [0, 张三0, 1, 0]
2023-11-08 19:05:16.171  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.171  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@67dc6b48), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@67dc6b48, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[1, 张三1, 1, 1])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[1])])
2023-11-08 19:05:16.171  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m2 ::: INSERT INTO t_user_2  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [1, 张三1, 1, 1]
2023-11-08 19:05:16.174  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.174  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@11cadb32), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@11cadb32, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[2, 张三2, 1, 2])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[2])])
2023-11-08 19:05:16.174  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_user_1  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [2, 张三2, 1, 2]
2023-11-08 19:05:16.177  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.178  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@704c3bdf), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@704c3bdf, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[3, 张三3, 1, 3])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[3])])
2023-11-08 19:05:16.178  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m2 ::: INSERT INTO t_user_2  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [3, 张三3, 1, 3]
2023-11-08 19:05:16.181  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.181  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@605eb072), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@605eb072, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[4, 张三4, 1, 4])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[4])])
2023-11-08 19:05:16.181  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_user_1  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [4, 张三4, 1, 4]
2023-11-08 19:05:16.184  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.184  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@43fd77d8), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@43fd77d8, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[5, 张三5, 1, 5])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[5])])
2023-11-08 19:05:16.184  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m2 ::: INSERT INTO t_user_2  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [5, 张三5, 1, 5]
2023-11-08 19:05:16.187  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.187  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@32ba5c65), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@32ba5c65, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[6, 张三6, 1, 6])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[6])])
2023-11-08 19:05:16.187  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_user_1  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [6, 张三6, 1, 6]
2023-11-08 19:05:16.191  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.191  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@5d96d434), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@5d96d434, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[7, 张三7, 1, 7])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[7])])
2023-11-08 19:05:16.191  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m2 ::: INSERT INTO t_user_2  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [7, 张三7, 1, 7]
2023-11-08 19:05:16.195  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.195  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@13dd7887), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@13dd7887, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[8, 张三8, 1, 8])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[8])])
2023-11-08 19:05:16.195  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m1 ::: INSERT INTO t_user_1  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [8, 张三8, 1, 8]
2023-11-08 19:05:16.199  INFO 20848 --- [           main] ShardingSphere-SQL                       : Logic SQL: INSERT INTO user  ( user_id,
user_name,
status,
age )  VALUES  ( ?,
?,
?,
? )
2023-11-08 19:05:16.199  INFO 20848 --- [           main] ShardingSphere-SQL                       : SQLStatement: InsertStatementContext(super=CommonSQLStatementContext(sqlStatement=org.apache.shardingsphere.sql.parser.sql.statement.dml.InsertStatement@538aa83f, tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@44de8e00), tablesContext=org.apache.shardingsphere.sql.parser.binder.segment.table.TablesContext@44de8e00, columnNames=[user_id, user_name, status, age], insertValueContexts=[InsertValueContext(parametersCount=4, valueExpressions=[ParameterMarkerExpressionSegment(startIndex=65, stopIndex=65, parameterMarkerIndex=0), ParameterMarkerExpressionSegment(startIndex=68, stopIndex=68, parameterMarkerIndex=1), ParameterMarkerExpressionSegment(startIndex=71, stopIndex=71, parameterMarkerIndex=2), ParameterMarkerExpressionSegment(startIndex=74, stopIndex=74, parameterMarkerIndex=3)], parameters=[9, 张三9, 1, 9])], generatedKeyContext=Optional[GeneratedKeyContext(columnName=user_id, generated=false, generatedValues=[9])])
2023-11-08 19:05:16.199  INFO 20848 --- [           main] ShardingSphere-SQL                       : Actual SQL: m2 ::: INSERT INTO t_user_2  ( user_id,
user_name,
status,
age )  VALUES  (?, ?, ?, ?) ::: [9, 张三9, 1, 9]
2023-11-08 19:05:16.207  INFO 20848 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closing ...
2023-11-08 19:05:16.208  INFO 20848 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-1} closed
2023-11-08 19:05:16.209  INFO 20848 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-2} closing ...
2023-11-08 19:05:16.209  INFO 20848 --- [extShutdownHook] com.alibaba.druid.pool.DruidDataSource   : {dataSource-2} closed
Disconnected from the target VM, address: '127.0.0.1:53866', transport: 'socket'Process finished with exit code 0

🍊7.观察一下数据库的数据

masterdemo.t_user_1表的数据如图下所示：

可以发现masterdemo库的t_user_1表的user_id都是偶数，masterdemo库的t_user_2表没有数据。

masterdemo2.course_2表的数据如图下所示：

可以发现masterdemo2库的t_user_2表的user_id都是奇数，masterdemo2库的t_user_1表没有数据。

🍊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/1.1.0http://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>

📢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。
• 💥内心起伏不定，我时而激动，时而沉思。我希望自己能成为一个综合性人才，具备技术、业务和管理方面的精湛技能。我想成为产品架构路线的总设计师，团队的指挥者，技术团队的中流砥柱，企业战略和资本规划的实战专家。
• 🎉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/