Question

定义

CREATE SHADOW RULE shadowRuleDefinition [, shadowRuleDefinition] ... 

ALTER SHADOW RULE shadowRuleDefinition [, shadowRuleDefinition] ... 

ALTER SHADOW ALGORITHM shadowAlgorithm [, shadowAlgorithm] ...

DROP SHADOW RULE ruleName [, ruleName] ...

DROP SHADOW ALGORITHM algorithmName [, 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

• 重复的ruleName无法被创建
• resourceMapping 指定源数据库和影子库的映射关系，需使用 RDL 管理的 resource ，请参考 数据源资源
• shadowAlgorithm 可同时作用于多个 shadowTableRule
• algorithmName 未指定时会根据 ruleName、tableName 和 shadowAlgorithmType 自动生成
• shadowAlgorithmType 目前支持 COLUMN_REGEX_MATCH 和 SIMPLE_NOTE
• shadowTableRule 能够被不同的 shadowRuleDefinition 复用，因此在执行 DROP SHADOW RULE 时，对应的 shadowTableRule 不会被移除
• shadowAlgorithm 能够被不同的 shadowTableRule 复用，因此在执行 ALTER SHADOW RULE 时，对应的 shadowAlgorithm 不会被移除

示例

CREATE SHADOW RULE shadow_rule(
SOURCE=demo_ds,
SHADOW=demo_ds_shadow,
t_order((simple_note_algorithm, TYPE(NAME=SIMPLE_NOTE, PROPERTIES("shadow"="true", foo="bar"))),(TYPE(NAME=COLUMN_REGEX_MATCH, PROPERTIES("operation"="insert","column"="user_id", "regex"='[1]')))), 
t_order_item((TYPE(NAME=SIMPLE_NOTE, PROPERTIES("shadow"="true", "foo"="bar")))));

ALTER SHADOW RULE shadow_rule(
SOURCE=demo_ds,
SHADOW=demo_ds_shadow,
t_order((simple_note_algorithm, TYPE(NAME=SIMPLE_NOTE, PROPERTIES("shadow"="true", foo="bar"))),(TYPE(NAME=COLUMN_REGEX_MATCH, PROPERTIES("operation"="insert","column"="user_id", "regex"='[1]')))), 
t_order_item((TYPE(NAME=SIMPLE_NOTE, PROPERTIES("shadow"="true", "foo"="bar")))));

ALTER SHADOW ALGORITHM 
(simple_note_algorithm, TYPE(NAME=SIMPLE_NOTE, PROPERTIES("shadow"="true", "foo"="bar"))), 
(user_id_match_algorithm, TYPE(NAME=COLUMN_REGEX_MATCH,PROPERTIES("operation"="insert", "column"="user_id", "regex"='[1]')));

DROP SHADOW RULE shadow_rule;

DROP SHADOW ALGORITHM simple_note_algorithm;