ShardingSphere5.0.0-alpha如何实现mysql分库分表

发布时间:2021-07-02 15:55:37 作者:chen
来源:亿速云 阅读:738

这篇文章主要讲解了“ShardingSphere5.0.0-alpha如何实现mysql分库分表”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着小编的思路慢慢深入,一起来研究和学习“ShardingSphere5.0.0-alpha如何实现mysql分库分表”吧!

声明

正文

需求

我们有两个数据库 miaosha2 和 miaosha3, 每个数据库中都有 2 张被拆分过的用户表 user_info0 和 user_info1

当我们往用户表插数据时, 会按照一定的规则(根据自增id取模), 落到某个 miaosha 库中的某张 user_info 表中.

准备工作

1. 数据库表
create database miaosha2;

DROP TABLE IF EXISTS `miaosha2`.`user_info0`;
CREATE TABLE `miaosha2`.`user_info0`
(
    `id`         bigint(20)                    NOT NULL AUTO_INCREMENT,
    `user_label` varchar(32) COLLATE utf8_bin           DEFAULT NULL,
    `username`   varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `email`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `phone`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `password`   varchar(128) COLLATE utf8_bin NOT NULL,
    `active`     tinyint(4)                    NOT NULL DEFAULT '1',
    PRIMARY KEY (`id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 7
  DEFAULT CHARSET = utf8
  COLLATE = utf8_bin;


DROP TABLE IF EXISTS `miaosha2`.`user_info1`;
CREATE TABLE `miaosha2`.`user_info1`
(
    `id`         bigint(20)                    NOT NULL AUTO_INCREMENT,
    `user_label` varchar(32) COLLATE utf8_bin           DEFAULT NULL,
    `username`   varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `email`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `phone`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `password`   varchar(128) COLLATE utf8_bin NOT NULL,
    `active`     tinyint(4)                    NOT NULL DEFAULT '1',
    PRIMARY KEY (`id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 6
  DEFAULT CHARSET = utf8
  COLLATE = utf8_bin;



create database miaosha3;

DROP TABLE IF EXISTS `miaosha3`.`user_info0`;
CREATE TABLE `miaosha3`.`user_info0`
(
    `id`         bigint(20)                    NOT NULL AUTO_INCREMENT,
    `user_label` varchar(32) COLLATE utf8_bin           DEFAULT NULL,
    `username`   varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `email`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `phone`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `password`   varchar(128) COLLATE utf8_bin NOT NULL,
    `active`     tinyint(4)                    NOT NULL DEFAULT '1',
    PRIMARY KEY (`id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 7
  DEFAULT CHARSET = utf8
  COLLATE = utf8_bin;


DROP TABLE IF EXISTS `miaosha3`.`user_info1`;
CREATE TABLE `miaosha3`.`user_info1`
(
    `id`         bigint(20)                    NOT NULL AUTO_INCREMENT,
    `user_label` varchar(32) COLLATE utf8_bin           DEFAULT NULL,
    `username`   varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `email`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `phone`      varchar(64) COLLATE utf8_bin           DEFAULT NULL,
    `password`   varchar(128) COLLATE utf8_bin NOT NULL,
    `active`     tinyint(4)                    NOT NULL DEFAULT '1',
    PRIMARY KEY (`id`)
) ENGINE = InnoDB
  AUTO_INCREMENT = 6
  DEFAULT CHARSET = utf8
  COLLATE = utf8_bin;
2. pom 依赖
<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.3.2.RELEASE</version>
        <relativePath/>
    </parent>
    <groupId>com.nimo</groupId>
    <artifactId>shardingsphere-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>shardingsphere-demo</name>

    <properties>
        <java.version>1.8</java.version>
    </properties>
  
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
      
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.4</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
      
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
      
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- shardingsphere -->
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>shardingsphere-jdbc-core-spring-boot-starter</artifactId>
            <version>5.0.0-alpha</version>
        </dependency>

        <!-- 阿里数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.2.3</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>
3. application.yml

再次强调下, 本文采用的 shardingsphere 版本是 5.0.0-alpha. 不同版本配置会有差异.

本文在上一篇文章的基础上增加, 并修改了几个配置, 下面的源码中有标记出来

server:
  port: 8777

spring:
  shardingsphere:
    # 展示修改以后的sql语句
    props:
      sql-show: true
    datasource:
      # (这里增加了一个 ds1 的数据源)
      names: ds0,ds1
      common:
        type: com.alibaba.druid.pool.DruidDataSource
      ds0:
        url: jdbc:mysql://127.0.0.1:3306/miaosha2?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2b8
        username: root
        password: '123456'
        driver-class-name: com.mysql.cj.jdbc.Driver
      # (新增的配置)
      ds1:
        url: jdbc:mysql://127.0.0.1:3306/miaosha3?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT%2b8
        username: root
        password: '123456'
        driver-class-name: com.mysql.cj.jdbc.Driver
    rules:
      sharding:
        # 分布式序列算法配置
        key-generators:
          # 此处必须要配置,否则会导致报错
          snowflake:
            type: SNOWFLAKE
            props:
              worker-id: 123

        # 配置 user_info 表
        tables:
          user_info:
            # 分库策略 (新增的配置)
            database-strategy:
              standard:
                  sharding-column: id
                  sharding-algorithm-name: database-inline

            # 配置user_info的分库分表的规则 (增加了数据源的配置)
            actual-data-nodes: ds$->{0..1}.user_info$->{0..1}

            # 单分片键的标准分片
            table-strategy:
              standard:
                sharding-column: id
                sharding-algorithm-name: table-inline

            # 主键id生成策略(雪花算法)
            key-generate-strategy:
              key-generator-name: snowflake
              column: id

        # 配置分片算法
        sharding-algorithms:
          # 通过 id 取模的方式确定数据落到哪个库 (新增的配置)
          database-inline:
            type: INLINE
            props:
              algorithm-expression: ds$->{id % 2}

          # 通过 id 取模的方式确定数据落到哪个表
          table-inline:
            type: INLINE
            props:
              algorithm-expression: user_info$->{id % 2}
    enabled: true

mybatis:
  typeAliasesPackage: com.nimo.shardingdatabasedemo.entity
  mapperLocations: classpath:mapper/*.xml
4. 主要代码
// sql 
<insert id="addUser" parameterType="com.nimo.shardingdemo.entity.UserInfo">
   insert into user_info(id, username, password) values (#{id}, #{username}, #{password})
</insert>
 
 // 新增一个用户信息
@PostMapping("userinfo")
public Object addUserInfo(@RequestBody UserInfo userInfo) {
   return userInfoMapper.addUser(userInfo);
}
5. 测试命令
curl -X POST --location "http://localhost:8777/userinfo" \
    -H "Content-Type: application/json" \
    -d "{
          \"username\": \"wangbadan\",
          \"password\": \"123456\"
        }"

感谢各位的阅读,以上就是“ShardingSphere5.0.0-alpha如何实现mysql分库分表”的内容了,经过本文的学习后,相信大家对ShardingSphere5.0.0-alpha如何实现mysql分库分表这一问题有了更深刻的体会,具体使用情况还需要大家实践验证。这里是亿速云,小编将为大家推送更多相关知识点的文章,欢迎关注!

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