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ALTER SQL_PARSER RULE

描述

ALTER SQL_PARSER RULE 语法用于修改解析引擎规则配置。

语法

AlterSqlParserRule ::=
  'ALTER' 'SQL_PARSER' 'RULE' '(' sqlParserRuleDefinition ')'

sqlParserRuleDefinition ::=
  commentDefinition? (',' parseTreeCacheDefinition)? (',' sqlStatementCacheDefinition)?

commentDefinition ::=
  'SQL_COMMENT_PARSE_ENABLED' '=' sqlCommentParseEnabled

parseTreeCacheDefinition ::=
  'PARSE_TREE_CACHE' '(' cacheOption ')'

sqlStatementCacheDefinition ::=
  'SQL_STATEMENT_CACHE' '(' cacheOption ')'

sqlCommentParseEnabled ::=
  boolean

cacheOption ::=
  ('INITIAL_CAPACITY' '=' initialCapacity)? (','? 'MAXIMUM_SIZE' '=' maximumSize)?

initialCapacity ::=
  int

maximumSize ::=
  int

补充说明

  • SQL_COMMENT_PARSE_ENABLE:是否解析 SQL 注释

  • PARSE_TREE_CACHE:语法树本地缓存配置

  • SQL_STATEMENT_CACHE:SQL 语句本地缓存配置项

示例

  • 修改 SQL 解析引擎规则
ALTER SQL_PARSER RULE (
  SQL_COMMENT_PARSE_ENABLED=false, 
  PARSE_TREE_CACHE(INITIAL_CAPACITY=128, MAXIMUM_SIZE=1024), 
  SQL_STATEMENT_CACHE(INITIAL_CAPACITY=2000, MAXIMUM_SIZE=65535)
);

保留字

ALTERSQL_PARSERRULESQL_COMMENT_PARSE_ENABLEDPARSE_TREE_CACHEINITIAL_CAPACITYMAXIMUM_SIZESQL_STATEMENT_CACHE

相关链接