道喜技术日记 .^. 天天红玉世界. Rails参考资料：迁移类型及其限制值/默认值

迁移类型	MySQL类型	限制值/默认值
:binary	TINYBLOB, BLOB, MEDIUMBLOB, or LONGBLOB2	:limit => 1 to 4294967296 ( default = 65536 )
:boolean	TINYINT	–
:date	DATE	–
:datetime	DATETIME	–
:decimal	DECIMAL	:precision => 1 to 63 (default = 10) :scale => 0 to 30 (default = 0)3
:float	FLOAT	–
:integer	INT	:limit => 1 to 11 (default = 11)
:primary_key	INTAUTO_INCREMENT PRIMARY KEY	–
:string	VARCHAR	:limit => 1 to 255 (default = 255)
:text	TINYTEXT, TEXT, MEDIUMTEXT, or LONGTEXT2	:limit => 1 to 4294967296Bytes ( default = 65536Bytes )
:time	TIME	–
:timestamp	DATETIME	–