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_sql select 1
hsqldbselect 1 from information_schema.system_users
postgresqlselect version();
ingres select 1
derbyselect 1 错误，应为:values(1)
h2select 1