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CREATE SHARDING BINDING TABLE RULE

Description

The CREATE SHARDING BINDING TABLE RULE syntax is used to add binding relationships and create binding table rules for tables with sharding table rules

Syntax

CreateBindingTableRule ::=
  'CREATE' 'SHARDING' 'BINDING' 'TABLE' 'RULES'  bindingTableDefinition  (',' bindingTableDefinition )*

bindingTableDefinition ::=
  '(' tableName (',' tableName)* ')'

tableName ::=
  identifier

Supplement

  • Creating binding relationships rules can only use sharding tables;
  • A sharding table can only have one binding relationships;
  • The sharding table for creating binding relationships needs to use the same resources and the same actual tables. For example ds_${0..1}.t_order_${0..1} 与 ds_${0..1}.t_order_item_${0..1};
  • The sharding table for creating binding relationships needs to use the same sharding algorithm for the sharding column. For example t_order_{order_id % 2} and t_order_item_{order_item_id % 2};
  • Only one binding rule can exist, but can contain multiple binding relationships, so can not execute CREATE SHARDING BINDING TABLE RULE more than one time. When a binding table rule already exists but a binding relationship needs to be added, you need to use ALTER SHARDING BINDING TABLE RULE to modify the binding table.

Example

1.Create a binding table rule

-- Before creating a binding table rule, you need to create sharding table rules t_order, t_order_item
CREATE SHARDING BINDING TABLE RULES (t_order,t_order_item);

2.Create multiple binding table rules

-- Before creating binding table rules, you need to create sharding table rules t_order, t_order_item, t_product, t_product_item
CREATE SHARDING BINDING TABLE RULES (t_order,t_order_item),(t_product,t_product_item);

Reserved word

CREATE, SHARDING, BINDING, TABLE, RULES