Which SQL statement can be used to grant permissions in Lindorm - Lindorm

You can use the GRANT syntax to grant a user the specified permissions. For example, you can grant a user the read and write permission of a table or the full permission of a database.

Applicable engines

The GRANT syntax is applicable to all versions of LindormTable and LindormTSDB.

Syntax

grant_permission_statement ::=  GRANT privilege_definition ON resource_definition TO user_identifier 
privilege_definition       ::=  ALL | READ | WRITE | ADMIN | TRASH | SYSTEM
resource_definition        ::=  GLOBAL | DATABASE identifier | SCHEMA identifier | TABLE identifier

Parameters

Whether a GRANT statement can be executed successfully depends on the permissions that are granted to the user who executes the statement. For more information, see User and permission management.

Permission (privilege_definition)

The following table describes the permissions that can be granted.

Permission	Description
ALL or ALL PRIVILEGE	Grant the user all permissions on the resources, including READ, WRITE, ADMIN, and TRASH.
READ	Grant the user the read permission on the resources.
WRITE	Grant the user the write permission on the resources.
ADMIN	Grant the user the administrator permissions on the resources. Important The ADMIN permission is independent of the READ and WRITE permissions. A user granted the ADMIN permission on a database may fail to read or write all tables in the database unless the user is granted the read or write permissions on the tables.
TRASH	Grant the user the delete permission on the resources.
SYSTEM	Grant the user the cluster management permissions on the resources. The SYSTEM permission includes the ADMIN permission on the GLOBAL level. Important You cannot grant the SYSTEM permission on a specific database.

Resource level (resource_definition)

You can grant permissions on the following levels of resources:
- GLOBAL: Grant the user permissions on global resources.
  Important
  We recommend that you do not grant permissions, especially the ALL PRIVILEGE permission on resources of the GLOBAL level.
- DATABASE: Grant the user permissions on the specified database. The DATABASE level is equivalent to the SCHEMA level.
  Note
  LindormTable 2.5.3.3 and later versions support the DATABASE level. LindormTable versions earlier than 2.5.3.3 support only the SCHEMA level.
- TABLE: Grant the user permissions on the specified table.
The following permission levels from high to low are supported: GLOBAL, DATABASE (SCHEMA), and TABLE. For example, if a user have the READ permission on resources of the GLOBAL level, the user can read all tables in a database.
When you use the DATABASE, SCHEMA, or TABLE keyword, you must specify the identifier of the permission level. For example, DATABASE default and SCHEMA default indicates the database named default, and TABLE test indicates the table named test.

User to which permissions are granted (user_identifier)

The user_identifier parameter indicates the user to which permissions are granted.

Examples

Grant all permissions to a user

Grant all permissions on the database db1 to a user named user1.

GRANT ALL ON DATABASE db1 TO user1;
-- or
GRANT ALL ON SCHEMA db1 TO user1;

Grant the specified permissions to a user

Grant the ADMIN permission on table2 in the database db2 to a user named user2.
```
GRANT ADMIN ON TABLE db2.table2 TO user2;
```
Grant the WRITE permission on table3 in the current database to a user named user3.
```
GRANT WRITE ON TABLE table3 TO user3; 
```
Grant the READ permission on the GLOBAL level to a user named user4.
```
GRANT READ ON GLOBAL TO user4;
```