基于druid框架分离的SQL解析器，并不断新增适配国产数据库。
快速存储和读取键值对（key-value）数据到大文件，并支持多线程并发写入和多线程并发读取。设计核心思想是按序存储多条键值对消息数据，并把若干条消息数据组合成一个消息块，并记录消息块地址。
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