statement handle not free adhoc
fix test
fix wrong transaction_handle overwrite.
revert opFreeStatement
fetch SQL_TYPE_LONG and SQL_TYPE_INT64
opResponse()
autocommit
fix 're begin transaction'
fix test
calcBlr() move from xsqlvar.go to utils.go
fix test
value as big endian
float and double
add fail test (fetch string)
fix panic
fetch all record test (hung up)
fix sqltype bug
Fetch and Scan float32 & float64