remove useless todo items
rebuilding start!
add method execute
add Expr and Leaf
add fields
add compiler
use single quote
add runtime
fix expr cache
add metamodel
typo fix
add get_fields and data to model
add Query Result classes
add nfdct attr to select result
add fetchone
roll back get_fields
reset Query
add fetchall
create table with utf8 charset
finish ###...........0.1