常用数据库validationQuery检查语句

数据库	validationQuery
Oracle	select 1 from dual
DB2	select 1 from sysibm.sysdummy1
mysql	select 1
microsoft sql	select 1
hsqldb	select 1 from INFORMATION_SCHEMA.SYSTEM_USERS
postgresql	select version()
ingres	select 1
derby	select 1
H2	select 1