Use Norms

Shadow database

Supported

  • The database is MySQL, Oracle, PostgreSQL, SQLServer;

Unsupported

  • NoSQL database;

Shadow algorithm

Supported

  • The note shadow algorithm supports MDL and DDL statements;
  • The column shadow algorithm basically supports commonly used MDL statements;

Unsupported

  • Column shadow algorithm does not support DDL statements；
  • The column shadow algorithm does not support range value matching operations, for example: subQuery, BETWEEN, GROUP BY … HAVING…;
  • Use shadow library function + sub-library sub-table function, some special SQL is not supported, please refer toSQL Usage Specification

Column shadow algorithm DML statement support list

  • INSERT statement

Judge the inserted column and inserted value of INSERT operation

Operation SQL Support
INSERT INSERT INTO table (column,…) VALUES (value,…) true
INSERT INSERT INTO table (column,…) VALUES (value,…),(value,…),… true
INSERT INSERT INTO table (column,…) SELECT column1 from table1 where column1 = value1 false
  • SELECT/UPDATE/DELETE statement

Judge the column and values included in the WHERE condition

Condition SQL Support
= SELECT/UPDATE/DELETE … WHERE column = value true
LIKE/NOT LIKE SELECT/UPDATE/DELETE … WHERE column LIKE/NOT LIKE value true
IN/NOT IN SELECT/UPDATE/DELETE … WHERE column IN/NOT IN (value1,value2,…) true
BETWEEN SELECT/UPDATE/DELETE … WHERE column BETWEEN value1 AND value2 false
GROUP BY … HAVING… SELECT/UPDATE/DELETE … WHERE … GROUP BY column HAVING column > value; false
subQuery SELECT/UPDATE/DELETE … WHERE column = (SELECT column FROM table WHERE column = value) false