连接池的验证语句。避免被数据库服务器断开

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 错误

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 错误，应为:values(1)

H2 select 1