fixed config for poolPreparedStatement
Merge pull request #435 from cutedemons/master

add testcase
improve sql-wal
improve sql-parser db2 support
improve sql-parser db2 support
Merge remote-tracking branch 'upstream/master'
testcase fixed
improve StatView
bug fixed for com.alibaba.druid.proxy.jdbc.StatementProxyImpl.getMoreResults
improve sql wall
improve sql-wall
improve sql wall
去掉不必要的日志
improve sql wall