Retro Eye care Haitian Deep Dark Default

ALTER SHADOW RULE

Description

The ALTER SHADOW RULE syntax is used to alter shadow rule.

Syntax 

AlterShadowRule ::=
  'ALTER' 'SHADOW' 'RULE' shadowRuleDefinition (',' shadowRuleDefinition)*

shadowRuleDefinition ::=
  ruleName '(' storageUnitMapping shadowTableRule (',' shadowTableRule)* ')'
    
storageUnitMapping ::=
  'SOURCE' '=' storageUnitName ',' 'SHADOW' '=' storageUnitName

shadowTableRule ::=
  tableName '(' shadowAlgorithm ')'
    
shadowAlgorithm ::=
  'TYPE' '(' 'NAME' '=' shadowAlgorithmType ',' propertiesDefinition ')'

ruleName ::=
  identifier

storageUnitName ::=
  identifier

tableName ::=
  identifier

algorithmName ::=
  identifier

shadowAlgorithmType ::=
  string

propertiesDefinition ::=
  'PROPERTIES' '(' key '=' value (',' key '=' value)* ')'

key ::=
  string

value ::=
  literal

Loading ...

Supplement

  • storageUnitMapping specifies the mapping relationship between the source database and the shadow library. You need to use the storage unit managed by RDL, please refer to STORAGE UNIT;
  • shadowAlgorithm can act on multiple shadowTableRule at the same time;
  • If algorithmName is not specified, it will be automatically generated according to ruleName, tableName and shadowAlgorithmType;
  • shadowAlgorithmType currently supports VALUE_MATCH, REGEX_MATCH and SIMPLE_HINT.

Example

  • Create a shadow rule
ALTER SHADOW RULE shadow_rule(
  SOURCE=demo_ds,
  SHADOW=demo_ds_shadow,
  t_order(TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="true", "foo"="bar"))), 
  t_order_item(TYPE(NAME="VALUE_MATCH", PROPERTIES("operation"="insert","column"="user_id", "value"='1')))
);

Reserved word

ALTER, SHADOW, RULE, SOURCE, SHADOW, TYPE, NAME, PROPERTIES