Sharding-JDBC测试ChatGPT

问题:

Sharding-JDBC对订单表进行分库分表,16个库,每个库16张表。分片键订单id、用户id。分库规则,对分片键按1000取模再对16取模。分表规则,对分片键按1000取模再对256取模。配置文件如何写,以及ComplexKeysShardingAlgorithm实现代码?

 

回答:

针对订单表进行分库分表,每个库16张表,分片键为订单id和用户id,分库规则是对订单id按1000取模再对16取模,分表规则是对订单id按1000取模再对256取模。以下是配置文件和ComplexKeysShardingAlgorithm的实现代码示例: ### 配置文件(sharding-jdbc.yml):

 
复制代码
datasource:
  names: ds0, ds1, ds2, ds3, ds4, ds5, ds6, ds7, ds8, ds9, ds10, ds11, ds12, ds13, ds14, ds15
  # 配置16个数据源,具体配置信息省略

sharding:
  tables:
    order:
      actual-data-nodes: ds$->{0..15}.order_$->{0..15}
      database-strategy:
        complex:
          sharding-columns: order_id, user_id
          algorithm-class-name: com.example.algorithm.ComplexKeysShardingAlgorithm
      table-strategy:
        complex:
          sharding-columns: order_id, user_id
          algorithm-class-name: com.example.algorithm.ComplexKeysShardingAlgorithm
复制代码

 

### ComplexKeysShardingAlgorithm实现代码:

 
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package com.example.algorithm;
 
import org.apache.shardingsphere.api.sharding.complex.ComplexKeysShardingAlgorithm;
import org.apache.shardingsphere.api.sharding.complex.ComplexKeysShardingValue;
 
import java.util.Collection;
import java.util.LinkedHashSet;
 
public class ComplexKeysShardingAlgorithm implements ComplexKeysShardingAlgorithm<Long> {
     
    @Override
    public Collection<String> doSharding(Collection<String> availableTargetNames, ComplexKeysShardingValue<Long> shardingValue) {
        Collection<String> result = new LinkedHashSet<>();
         
        Long orderId = shardingValue.getValue("order_id");
        Long userId = shardingValue.getValue("user_id");
         
        if (orderId == null || userId == null) {
            throw new UnsupportedOperationException("Missing sharding key: order_id or user_id");
        }
         
        long dbShard = (orderId % 1000) % 16;
        long tableShard = (orderId % 1000) % 256;
         
        for (String targetName : availableTargetNames) {
            if (targetName.endsWith(String.valueOf(dbShard)) && targetName.endsWith(String.valueOf(tableShard))) {
                result.add(targetName);
            }
        }
         
        return result;
    }
}

  

在这个示例中,配置文件定义了对order表的分库分表规则,指定了ComplexKeysShardingAlgorithm作为算法类来处理分片逻辑。ComplexKeysShardingAlgorithm实现了ComplexKeysShardingAlgorithm接口,根据订单id和用户id来计算分库分表的逻辑。根据订单id计算出分库和分表的值,然后根据这些值来选择对应的数据源和表进行操作。
 
posted @   parkdifferent  阅读(14)  评论(0编辑  收藏  举报
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