Merge pull request #572 from yakolee/master

add api:tryGetConnection and fillConnection
fix a few spelling errors and a function name typo in SQLEvalVisitorUtils#registerBaseFunctions
Merge pull request #576 from lizhanhui/master

Fix a few spelling errors and a function name typo in SQLEvalVisitorUtils#registerBaseFunctions
compatible for early versions
Merge pull request #578 from wenshao/master

compatible for early versions
JdbcUtils getDbType support jdbc:sqlserver:
Merge pull request #579 from wenshao/master

JdbcUtils getDbType support jdbc:sqlserver:
add notFullTimeoutRetryCount support
Merge pull request #580 from wenshao/master

add notFullTimeoutRetryCount support