ReplaceStatement can't be supported,use insert into ...on duplicate key update... instead
Merge pull request #8 from wdw1206/master

 ReplaceStatement can't be supported,use insert into ...on duplicate key update... instead
调整druid解析流程，消除重复代码，使代码结构更好
Merge pull request #9 from wdw1206/master

调整druid解析流程，消除重复代码，使代码结构更好
Merge pull request #10 from opencloudb/master

优化NIO Read过程，避免中间变量