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SHOW SHARDING TABLE RULE

Description

The SHOW SHARDING TABLE RULE syntax is used to query the sharding table rule in the specified database.

Syntax

ShowShardingTableRule ::=
  'SHOW' 'SHARDING' 'TABLE' ('RULE' tableName | 'RULES') ('FROM' databaseName)?

tableName ::=
  identifier

databaseName ::=
  identifier

Supplement

  • When databaseName is not specified, the default is the currently used DATABASE. If DATABASE is not used, No database selected will be prompted.

Return value description

Column Description
table Logical table name
actual_data_nodes Actual data node
actual_data_sources Actual data source (Displayed when creating rules by RDL)
database_strategy_type Database sharding strategy type
database_sharding_column Database sharding column
database_sharding_algorithm_type Database sharding algorithm type
database_sharding_algorithm_props Database sharding algorithm properties
table_strategy_type Table sharding strategy type
table_sharding_column Table sharding column
table_sharding_algorithm_type Table sharding algorithm type
table_sharding_algorithm_props Table sharding algorithm properties
key_generate_column Sharding key generator column
key_generator_type Sharding key generator type
key_generator_props Sharding key generator properties

Example

  • Query the sharding table rules of the specified logical database
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)
  • Query the sharding table rules of the current logic database
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)
  • Query the specified sharding table rule
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)

Reserved word

SHOW, SHARDING, TABLE, RULE, FROM