| postgresql | sqlite | sqlserver | sybase | db2 | mysql | openbase | oracle | |
| binary | bytea | blob | image | image | blob(32768) | blob | object | blob |
| boolean | boolean | boolean | bit | bit | decimal(1) | tinyint(1) | boolean | number(1) |
| date | date | date | datetime | datetime | date | date | date | date |
| datetime | timestamp | datetime | datetime | datetime | timestamp | datetime | datetime | date |
| decimal | decimal | decimal | decimal | decimal | decimal | decimal | decimal | decimal |
| float | float | float | float(8) | float(8) | float | float | float | number |
| integer | integer | integer | int | int | int | int(11) | integer | number(38) |
| string | (note 1) | varchar(255) | varchar(255) | varchar(255) | varchar(255) | varchar(255) | char(4096) | varchar2(255) |
| text | text | text | text | text | clob(32768) | text | text | clob |
| time | time | datetime | datetime | time | time | time | time | date |
| timestamp | timestamp | datetime | datetime | timestamp | timestamp | datetime | timestamp | date |
reference:
http://www.blogjava.net/GavinMiao/archive/2011/09/06/358081.html
http://blog.csdn.net/dengxingbo/article/details/5896314
http://onlamp.com/onlamp/2001/09/13/aboutSQL.html
http://www.java2s.com/Code/Java/Hibernate/JavaTypeVSHibernateType.htm