分库分表中间件shardingsphere-proxy实战

-- 创建分库分表规则
CREATE SHARDING ALGORITHM random_db_algorithm (
  TYPE=RANGE,
  COLUMNS=user_id,
  ALGORITHM_CLASS=com.example.ShardingAlgorithm
);
 
CREATE SHARDING ALGORITHM random_table_algorithm (
  TYPE=RANGE,
  COLUMNS=order_id,
  ALGORITHM_CLASS=com.example.ShardingAlgorithm
);
 
CREATE SHARDING TABLE RULES (
  t_order {
    DATANODES="ds${0..1}.t_order_${0..1}",
    TABLE_STRATEGY={
      standard.STRATEGY.INLINE.shard-key=order_id,
      standard.STRATEGY.INLINE.sharding-column=order_id,
      standard.STRATEGY.INLINE.algorithm-expression=random_table_algorithm
    },
    KEY_GENERATOR=snowflake
  },
  t_order_item {
    DATANODES="ds${0..1}.t_order_item_${0..1}",
    TABLE_STRATEGY={
      standard.STRATEGY.INLINE.shard-key=order_id,
      standard.STRATEGY.INLINE.sharding-column=order_id,
      standard.STRATEGY.INLINE.algorithm-expression=random_table_algorithm
    },
    KEY_GENERATOR=snowflake
  }
);
 
CREATE SHARDING DATABASE RULES (
  ds${0..1}.t_order_${0..1} ISSHARED=true,
  ds${0..1}.t_order_item_${0..1} ISSHARED=true
);
 
-- 配置分片键生成策略
CREATE SHARDING KEY GENERATOR snowflake (
  TYPE=SNOWFLAKE,
  COLUMNS=order_id
);

这个实例展示了如何在ShardingSphere中定义数据分片规则，包括数据节点、表策略和数据库策略。同时，它演示了如何使用内置的SNOWFLAKE策略来生成唯一的分片键。这个例子对于理解分库分表的概念和实践具有很好的教育意义。