21 rules for dividing databases and tables, hold!

Tech 2023-05-16 11:06:13 Source: Network

ShardingSphere5.xt_orderDB_1DB_2t_order_1t_order_2 t_order t_order_0t_order_1t_order_n DB_1

ShardingSphere5.x

t_orderDB_1DB_2t_order_1t_order_2

t_order t_order_0t_order_1t_order_n

DB_1.t_order_1DB_2.t_order_2

t_order t_order_0 t_order_910 t_ordert_order_n

SQLSQL t_orderSQLSQL t_order

SQL

select * from t_order where order_no='A11111'

SQL

select * from DB_1.t_order_n where order_no='A11111'

DB_1.t_order_n

JOIN

JOIN

t_cityDB_n.t_order_nJOINJOIN

10001000SQL

t_order SQLSQLorder_no order_no % 2 DB_1 DB_2

order_no t_order order_no

ShardingSphere

ID
order_no % 2
.....

JOIN

t_order t_order_item order_no order_no

t_order t_order_item SQL

SELECT * FROM t_order o JOIN t_order_item i ON o.order_no=i.order_no

SQL

SELECT * FROM t_order_0 o JOIN t_order_item_0 i ON o.order_no=i.order_no SELECT * FROM t_order_0 o JOIN t_order_item_1 i ON o.order_no=i.order_no SELECT * FROM t_order_1 o JOIN t_order_item_0 i ON o.order_no=i.order_no SELECT * FROM t_order_1 o JOIN t_order_item_1 i ON o.order_no=i.order_no

t_order_n t_order_item_n

SELECT * FROM t_order_0 o JOIN t_order_item_0 i ON o.order_id=i.order_id SELECT * FROM t_order_1 o JOIN t_order_item_1 i ON o.order_id=i.order_id

t_order t_order_item t_order

SQL

SQL SQL -> -> SQL -> SQL -> SQL ->

SQLSQLSQL

SELECT order_no FROM t_order where  order_status > 0  and user_id = 10086

SQLFieldTableConditionOrder ByGroup ByLimit SQL

SQLuser_idSQL

SELECT order_no FROM t_order where user_id = 10086 and order_status > 0

SQL

SQL SQL

SQL SQLSQL

3

SQL

SQL = BETWEEN IN SQLSQL

SELECT * FROM t_order  where t_order_id in (1,2)

SQL

SELECT * FROM t_order_0  where t_order_id in (1,2)SELECT * FROM t_order_1  where t_order_id in (1,2)

SQLSQLSQL

t_order t_order_id t_usert_order_id

SELECT * FROM t_order_0 t LEFT JOIN t_user_0 u ON u.user_id = t.user_id WHERE t.user_id = 1SELECT * FROM t_order_0 t LEFT JOIN t_user_1 u ON u.user_id = t.user_id WHERE t.user_id = 1SELECT * FROM t_order_1 t LEFT JOIN t_user_0 u ON u.user_id = t.user_id WHERE t.user_id = 1SELECT * FROM t_order_1 t LEFT JOIN t_user_1 u ON u.user_id = t.user_id WHERE t.user_id = 1

5

DQL DML DDL t_order SQL t_order_0 t_order_n

SET TCL

autocommit

SET autocommit=0;

DCL order order

CREATE USER order@127.0.0.1 identified BY '';

DESCRIBE t_order;

t_order t_order_0 t_order_n

SQL

USE order_db;

ShardingSphere Schema

SQL

SQLSQL t_order SQL t_order

SELECT * FROM t_order

SELECT * FROM t_order_n

SQL

SQL SQL JDBC

SQL

t_ordert_order_nIDID

IDIDIDID

9ID

SQL

API

XASeata

5 Seata +

Shadow Table

21Proxy

ShardingSphere5.x 2

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Tag: rules for dividing databases and tables hold