服务名(在tnsname.ora中配置)是进行client连接数据库时会用到, SID对应的才是的DataBase,myConnection = DriverManager.getConnection(
"jdbc:oracle:thin:@test2000:1521:orac", //orac为SID
"username","password");
"jdbc:oracle:thin:@test2000:1521:orac", //orac为SID
"username","password");
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