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
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