bug fixed for async closed
Merge pull request #737 from wenshao/master

bug fixed for async closed
improved sql parser for sqlserver, support offset fetch clause
bug fixed for async close
Merge pull request #738 from wenshao/master

improved sql parser for sqlserver, support offset fetch clause
JdbcUtils support dameng database
Merge pull request #739 from wenshao/master

JdbcUtils support dameng database
JdbcUtils support kingbase
Merge pull request #740 from wenshao/master

JdbcUtils support kingbase
remove unused code
Merge pull request #741 from wenshao/master

remove unused code
improved mysql exception sorter
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improved mysql exception sorter
Merge pull request #742 from wenshao/master

improved mysql exception sorter