connectionString设置问题？“connection”指的是什么意思

name里面是你起的名字，是什么都无所谓，在cs代码中调用要对应这个name按楼主的qyfhqtjConnectionString2，调用时就是 string connectionString = System.Configuration.ConfigurationManager.ConnectionStrings[“qyfhqtjConnectionString2“].ConnectionString;

不可数名词 n.[U] 联系 something which connects two or more things · The connection between the two places has been severed. 这两地的联系已被切断。 · There’s no connection between these two things. 这两件事没有任何联系。 · His name is in connection with Chinese boxing. 他的名字与中国武术联系在一起。 不可数名词 n.[U] （火车、轮船等的）联运 when trains, ships, etc. meet so that people can change from one to another quickly · Ted’s train was late so he missed the connection. 特德坐的那辆火车晚点，因此他错过了联运。 · The hotel has direct tunnel connection to the station. 这家旅社有地道直通车站。

你的赋值语句错了Connection con = DriverManager.getConnection(url, username, password); 但返回的对象却是conn;