1. 导入maven依赖

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.apache.shardingsphere/shardingsphere-jdbc-core-spring-boot-starter -->
        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.11</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.1.1</version>
        </dependency>

2. 构建自己的数据库表，这里我随便弄了两个表
   
   表中的字段是这样子的
   
3. 不分库但是分表的yml配置

spring:
  application:
    name: shardingdemo
  shardingsphere:

    datasource:
      names: master
      master:
        type: com.zaxxer.hikari.HikariDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        jdbc-url: jdbc:mysql://xxxxx:3306/xxxx?useUnicode=true&characterEncoding=utf8&verifyServerCertificate=false&useSSL=true
        username: xxxx
        password: xxxx
# 配置虚拟表映射
    sharding:
      tables:
        course:
          actualDataNodes: master.course_$->{1..2}
          tableStrategy:
            inline:
              shardingColumn: id
              algorithmExpression: course_$->{id%2+1}
          keyGenerator:
            column: id
            type: SNOWFLAKE
            props:
              worker:
                id: 1
    props:
      sql.show: true

这个yml文件的意思是只进行分表，但是不进行分库，course总共有两张表，在插入的时候，对id字段进行雪花赋值，然后进行 id%+1的算法，得出插入哪张course