validationQuery each Database

출처 : http://stackoverflow.com/questions/10684244/dbcp-validationquery-for-different-databases

There is not only one validationQuery for all databases. On each database you have to use different validationQuery.

After few hours of googling and testing I have collected this table:

Database validationQuery notes

• hsqldb - select 1 from INFORMATION_SCHEMA.SYSTEM_USERS
• Oracle - select 1 from dual
• DB2 - select 1 from sysibm.sysdummy1
• mysql - select 1
• microsoft SQL Server - select 1 (tested on SQL-Server 9.0, 10.5 [2008])
• postgresql - select 1
• ingres - select 1
• derby - values 1
• H2 - select 1
• Firebird - select 1 from rdb$database