Documented data type mapping.

main.go

@@ -66,6 +66,27 @@ func setupConnections(engine *xorm.Engine) {
 	engine.SetMaxIdleConns(CONNECTION_LIMIT)
 }
 
+/*
+------------------------------+---------------------------------------+------------
+go type's kind			value method				xorm type
+------------------------------+---------------------------------------+------------
+implemented Conversion		Conversion.ToDB / Conversion.FromDB	Text
+int, int8, int16, int32							Int
+uint, uint8, uint16, uint32						Int
+int64, uint64								BigInt
+float32									Float
+float64									Double
+complex64, complex128		json.Marshal / json.UnMarshal		Varchar(64)
+[]uint8									Blob
+array, slice, other maps	json.Marshal / json.UnMarshal		Text
+bool				1 or 0					Bool
+string									Varchar(255)
+time.Time								DateTime
+cascade struct			primary key field value			BigInt
+struct				json.Marshal / json.UnMarshal		Text
+Others									Text
+------------------------------+---------------------------------------+------------
+ */
 func setupMapping(engine *xorm.Engine) {
 	same := core.SameMapper{}
 	gonic := core.GonicMapper{}