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Shadow

Syntax

CREATE SHADOW RULE shadowRuleDefinition [, shadowRuleDefinition] ... 

ALTER SHADOW RULE shadowRuleDefinition [, shadowRuleDefinition] ... 

CREATE SHADOW ALGORITHM shadowAlgorithm [, shadowAlgorithm] ...

ALTER SHADOW ALGORITHM shadowAlgorithm [, shadowAlgorithm] ...

DROP SHADOW RULE ruleName [, ruleName] ...

DROP SHADOW ALGORITHM algorithmName [, algorithmName] ...

CREATE DEFAULT SHADOW ALGORITHM NAME = algorithmName

shadowRuleDefinition: ruleName(resourceMapping, shadowTableRule [, shadowTableRule] ...)

resourceMapping: SOURCE=resourceName, SHADOW=resourceName

shadowTableRule: tableName(shadowAlgorithm [, shadowAlgorithm] ...)

shadowAlgorithm: ([algorithmName, ] TYPE(NAME=shadowAlgorithmType, PROPERTIES([algorithmProperties] ...)))

algorithmProperties: algorithmProperty [, algorithmProperty] ... 

algorithmProperty: key=value

Parameters Explained

name DateType Description
ruleName IDENTIFIER Rule name
resourceName IDENTIFIER Resource name
tableName IDENTIFIER Shadow table name
algorithmName IDENTIFIER Shadow algorithm name
shadowAlgorithmType STRING Shadow algorithm type

Notes

  • Duplicate ruleName cannot be created
  • resourceMapping specifies the mapping relationship between the source database and the shadow library. You need to use the resource managed by RDL, please refer to resource
  • 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
  • shadowTableRule can be reused by different shadowRuleDefinition, so when executing DROP SHADOW RULE, the corresponding shadowTableRule will not be removed
  • shadowAlgorithm can be reused by different shadowTableRule, so when executing ALTER SHADOW RULE, the corresponding shadowAlgorithm will not be removed

Example

CREATE SHADOW RULE shadow_rule(
SOURCE=demo_ds,
SHADOW=demo_ds_shadow,
t_order((simple_hint_algorithm, TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="true", "foo"="bar"))),(TYPE(NAME="REGEX_MATCH", PROPERTIES("operation"="insert","column"="user_id", "regex"='[1]')))), 
t_order_item((TYPE(NAME="VALUE_MATCH", PROPERTIES("operation"="insert","column"="user_id", "value"='1')))));

ALTER SHADOW RULE shadow_rule(
SOURCE=demo_ds,
SHADOW=demo_ds_shadow,
t_order((simple_hint_algorithm, TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="true", "foo"="bar"))),(TYPE(NAME="REGEX_MATCH", PROPERTIES("operation"="insert","column"="user_id", "regex"='[1]')))), 
t_order_item((TYPE(NAME="VALUE_MATCH", PROPERTIES("operation"="insert","column"="user_id", "value"='1')))));

CREATE SHADOW ALGORITHM 
(simple_hint_algorithm, TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="true", "foo"="bar"))), 
(user_id_match_algorithm, TYPE(NAME="REGEX_MATCH",PROPERTIES("operation"="insert", "column"="user_id", "regex"='[1]')));


ALTER SHADOW ALGORITHM 
(simple_hint_algorithm, TYPE(NAME="SIMPLE_HINT", PROPERTIES("shadow"="false", "foo"="bar"))), 
(user_id_match_algorithm, TYPE(NAME="VALUE_MATCH",PROPERTIES("operation"="insert", "column"="user_id", "value"='1')));

DROP SHADOW RULE shadow_rule;

DROP SHADOW ALGORITHM simple_hint_algorithm;

CREATE DEFAULT SHADOW ALGORITHM NAME = simple_hint_algorithm;