CREATE BLOCK RULE

Function

This function creates a filtering rule, including the filtering rule name, bound client name, client IP address, user, and matching mode.

This syntax is supported only by clusters of 9.1.0.100 and later versions.

Precautions

Only a user with the database owner permission or the gs_role_block role permission can run CREATE BLOCK RULE. A system administrator has this permission by default.

Syntax

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CREATE BLOCK RULE [ IF NOT EXISTS ] block_name
    [ [ TO user_name@'host' ] | [ TO user_name ] | [ TO 'host' ] ] |
    [ FOR UPDATE | SELECT | INSERT | DELETE | MERGE ] |
    FILTER BY
    { SQL ( 'text' ) | TEMPLATE ( template_parameter = value ) }
    [ WITH ( { with_parameter = value }, [, ... ] ) ];

Parameter Description

• block_name

  Name of the query filtering rule to be created.

  Value range: a string. It must comply with the naming convention.

• user_name

  Queries the users to which the filtering rule applies.

  Value range: A string. It must be a valid username.

• host

  Queries the client IP address to which the filtering rule applies.

  Value range: a string of valid IP addresses.

• SQL

  Queries the regular expression matching statement of the filtering rule.

  Value range: a string or a regular expression. The length of the statement or keyword matching the regular expression cannot exceed 1,024 characters.

• template_parameter

  Queries a filtering rule matching template.

  Value range: unique_sql_id/sql_hash. The value is a character string, where unique_sql_id must be all digits.

• with_parameter

  Queries filtering rule options. You can set both of them. The query that meets any of the parameters will be filtered out.

  Value range:

  • application_name (client name)
  • query_band
  • table_num (number of tables scanned by the statement)
  • partition_num (maximum number of partitions to be scanned by the operator)
  • estimate_row (estimated maximum number of table rows scanned by the operator)

Examples

Create a query filtering rule named query_block.

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CREATE BLOCK RULE query_block TO user1@'192.168.x.x' FOR SELECT FILTER BY SQL('select * from table_name')WITH(application_name='gsql',query_band='test1',table_num='2',partition_num='3',estimate_row='1000');

CREATE BLOCK RULE query_block FILTER BY TEMPLATE(unique_sql_id='1634655172');

CREATE BLOCK RULE query_block FILTER BY TEMPLATE(sql_hash='sql_c3d119fe636b9ef439b1f96c561c74ff');