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配置外部字典

如果使用xml文件配置字典，则比字典配置具有以下结构:

  1. <dictionary>
  2.     <name>dict_name</name>
  4.     <structure>
  5.       <!-- Complex key configuration -->
  6.     </structure>
  8.     <source>
  9.       <!-- Source configuration -->
  10.     </source>
  12.     <layout>
  13.       <!-- Memory layout configuration -->
  14.     </layout>
  16.     <lifetime>
  17.       <!-- Lifetime of dictionary in memory -->
  18.     </lifetime>
  19. </dictionary>

相应的 DDL-查询 具有以下结构:

  1. CREATE DICTIONARY dict_name
  2. (
  3.     ... -- attributes
  4. )
  5. PRIMARY KEY ... -- complex or single key configuration
  6. SOURCE(...) -- Source configuration
  7. LAYOUT(...) -- Memory layout configuration
  8. LIFETIME(...) -- Lifetime of dictionary in memory
  • name – The identifier that can be used to access the dictionary. Use the characters [a-zA-Z0-9_\-].
  • 来源 — Source of the dictionary.
  • 布局 — Dictionary layout in memory.
  • 结构 — Structure of the dictionary . A key and attributes that can be retrieved by this key.
  • 使用寿命 — Frequency of dictionary updates.

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