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Posted to notifications@shardingsphere.apache.org by GitBox <gi...@apache.org> on 2020/04/19 06:20:45 UTC
[GitHub] [shardingsphere] fengyunhe opened a new issue #5231: How to use the columns of the parent table to configure the child table fragments ？
fengyunhe opened a new issue #5231: How to use the columns of the parent table to configure the child table fragments ？
URL: https://github.com/apache/shardingsphere/issues/5231
## Question
If there is no user_id column in my order_item table, but there is a user_id column in the corresponding order table, and order_id in order_item corresponds to the id in order, how can I configure the user_id column to fragment the order_item table?
```yaml
shardingRule:
tables:
category:
actualDataNodes: ds${4..6}.category
user:
actualDataNodes: ds${4..6}.user
databaseStrategy:
inline:
shardingColumn: id
algorithmExpression: ds${id%3+3}
order:
actualDataNodes: ds${4..6}.order${0..1}
databaseStrategy:
inline:
shardingColumn: user_id
algorithmExpression: ds${user_id%3+3}
tableStrategy:
inline:
shardingColumn: id
algorithmExpression: order${id%2}
keyGenerator:
type: SNOWFLAKE
column: id
order_item:
actualDataNodes: ds${4..6}.order_item${0..1}
databaseStrategy:
inline:
shardingColumn: user_id
algorithmExpression: ds${user_id%3+3}
tableStrategy:
inline:
shardingColumn: id
algorithmExpression: order_item${order_id%2}
bindingTables:
- user,order,order_item
broadcastTables:
- category
```
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[GitHub] [shardingsphere] kimmking commented on issue #5231: How to use the columns of the parent table to configure the child table fragments ？
Posted by GitBox <gi...@apache.org>.
kimmking commented on issue #5231: How to use the columns of the parent table to configure the child table fragments ？
URL: https://github.com/apache/shardingsphere/issues/5231#issuecomment-616129407
It must be a 'sharding key column' in a sharding table.
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