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 Oracleselect 1 from dual DB2select 1 from sysibm.sysdummy1 mysqlselect 1 microsoft_sqlselect 1 hsqldbselect 1 from INFORMATION_SCHEMA.SYSTEM_USERS postgresqlselect version();ingres select 1 derbyselect 1 错误，应为:values(1) H2select 1
连接池的验证语句。避免被数据库服务器断开
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