2019独角兽企业重金招聘Python工程师标准>>>

java.sql.Connection.close() 

Releases this Connection object's database and JDBC resources immediately instead of waiting for them to be automatically released.

close()方法只是释放了资源。实际上此时Connection 对象并并不等于null。

转载于:https://my.oschina/u/2308739/blog/716015