Go与字段类型对应表

如果不使用tag来定义field对应的数据库字段类型，那么系统会自动给出一个默认的字段类型，对应表如下：

go type's kind	value method	xorm type
implemented Conversion	Conversion.ToDB / Conversion.FromDB	Text
int, int8, int16, int32, uint, uint8, uint16, uint32		Int
int64, uint64		BigInt
float32		Float
float64		Double
complex64, complex128	json.Marshal / json.UnMarshal	Varchar(64)
[]uint8		Blob
array, slice, map except []uint8	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