SHOW SHARDING TABLE RULE 语法用于查询指定逻辑库中的分片规则。
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```sql
>>>>>>> 731b174a28364b0ec70755800459edb332b68209
ShowShardingTableRule ::=
'SHOW' 'SHARDING' 'TABLE' ('RULE' tableName | 'RULES') ('FROM' databaseName)?
tableName ::=
identifier
databaseName ::=
identifier
databaseName 时，默认是当前使用的 DATABASE。 如果也未使用 DATABASE 则会提示 No database selected。| 列 | 说明 |
|---|---|
| table | 逻辑表名 |
| actual_data_nodes | 实际的数据节点 |
| actual_data_sources | 实际的数据源（通过 RDL 创建的规则时显示） |
| database_strategy_type | 数据库分片策略类型 |
| database_sharding_column | 数据库分片键 |
| database_sharding_algorithm_type | 数据库分片算法类型 |
| database_sharding_algorithm_props | 数据库分片算法参数 |
| table_strategy_type | 表分片策略类型 |
| table_sharding_column | 表分片键 |
| table_sharding_algorithm_type | 表分片算法类型 |
| table_sharding_algorithm_props | 表分片算法参数 |
| key_generate_column | 分布式主键生成列 |
| key_generator_type | 分布式主键生成器类型 |
| key_generator_props | 分布式主键生成器参数 |
SHOW SHARDING TABLE RULES FROM sharding_db;
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
| table | actual_data_nodes | actual_data_sources | database_strategy_type | database_sharding_column | database_sharding_algorithm_type | database_sharding_algorithm_props | table_strategy_type | table_sharding_column | table_sharding_algorithm_type | table_sharding_algorithm_props | key_generate_column | key_generator_type | key_generator_props |
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
| t_order | | ds_0,ds_1 | | | | | mod | order_id | mod | sharding-count=4 | | | |
| t_order_item | | ds_0,ds_1 | | | | | mod | order_id | mod | sharding-count=4 | | | |
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
2 rows in set (0.12 sec)
SHOW SHARDING TABLE RULES;
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
| table | actual_data_nodes | actual_data_sources | database_strategy_type | database_sharding_column | database_sharding_algorithm_type | database_sharding_algorithm_props | table_strategy_type | table_sharding_column | table_sharding_algorithm_type | table_sharding_algorithm_props | key_generate_column | key_generator_type | key_generator_props |
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
| t_order | | ds_0,ds_1 | | | | | mod | order_id | mod | sharding-count=4 | | | |
| t_order_item | | ds_0,ds_1 | | | | | mod | order_id | mod | sharding-count=4 | | | |
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
2 rows in set (0.12 sec)
SHOW SHARDING TABLE RULE t_order;
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
| table | actual_data_nodes | actual_data_sources | database_strategy_type | database_sharding_column | database_sharding_algorithm_type | database_sharding_algorithm_props | table_strategy_type | table_sharding_column | table_sharding_algorithm_type | table_sharding_algorithm_props | key_generate_column | key_generator_type | key_generator_props |
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
| t_order | | ds_0,ds_1 | | | | | mod | order_id | mod | sharding-count=4 | | | |
+--------------+-------------------+---------------------+------------------------+--------------------------+----------------------------------+-----------------------------------+---------------------+-----------------------+-------------------------------+--------------------------------+---------------------+--------------------+---------------------+
1 rows in set (0.12 sec)
CREATE、SHARDING、TABLE、RULE、FROM