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 ...
数据库 validationQuery Oracle select 1 from dual DB2 select 1 from sysibm.sysdummy1 mysql select 1 microsoft_sql select ...