SpringBoot集成ShardingSphere-JDBC的基本使用指南

<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>shardingsphere-jdbc-core-spring-boot-starter</artifactId>
    <version>5.5.0</version> <!-- 建议使用最新稳定版 -->
</dependency>
<!-- 还需要添加数据库驱动和JPA/MyBatis等依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <scope>runtime</scope>
</dependency>

spring:
  shardingsphere:
    # 开启 SQL 日志，便于调试
    props:
      sql-show: true
    # 1. 定义真实数据源
    datasource:
      names: ds0, ds1
      # 第一个数据源
      ds0:
        type: com.zaxxer.hikari.HikariDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        jdbc-url: jdbc:mysql://localhost:3306/ds0?useSSL=false
        username: root
        password: your_password
      # 第二个数据源
      ds1:
        type: com.zaxxer.hikari.HikariDataSource
        driver-class-name: com.mysql.cj.jdbc.Driver
        jdbc-url: jdbc:mysql://localhost:3307/ds1?useSSL=false # 注意端口或地址不同
        username: root
        password: your_password

    # 2. 定义规则
    rules:
      # 分片规则
      sharding:
        tables:
          # 配置 t_order 表的规则
          t_order:
            # 数据节点：逻辑表 t_order 映射到 ds0 和 ds1 的 t_order_0 和 t_order_1 表
            actual-data-nodes: ds$->{0..1}.t_order_$->{0..1}
            # 分库策略
            database-strategy:
              standard:
                sharding-column: user_id # 分库键
                sharding-algorithm-name: database_inline # 分库算法名称
            # 分表策略
            table-strategy:
              standard:
                sharding-column: order_id # 分表键
                sharding-algorithm-name: table_inline # 分表算法名称
        # 3. 定义分片算法
        sharding-algorithms:
          # 数据库分片算法：基于 user_id 取模
          database_inline:
            type: INLINE
            props:
              algorithm-expression: ds$->{user_id % 2}
          # 表分片算法：基于 order_id 取模
          table_inline:
            type: INLINE
            props:
              algorithm-expression: t_order_$->{order_id % 2}

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "t_order") // 使用逻辑表名
public class Order {
    @Id
    private Long orderId;
    private Long userId;
    private String description;

    // Getters and Setters
}

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface OrderRepository extends JpaRepository<Order, Long> {
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class OrderService {

    @Autowired
    private OrderRepository orderRepository;

    public void createOrders() {
        for (int i = 0; i < 10; i++) {
            Order order = new Order();
            order.setOrderId((long) i);
            order.setUserId((long) (i % 4)); // 模拟不同的用户
            order.setDescription("Order for user " + order.getUserId());
            orderRepository.save(order);
        }
    }
}