connection

问题 So here's the deal. I don't have it yet, but starting Friday, I'm in the process of making a forum. What I'd like to do is check to see if a user is registered on the forum. I'm not sure exactly, but lets say the users are stored in URL/users/NAME.WHATEVER (jsp?) how, in java, do i make a URL connection, and check to see if URL/users/Robert.WHATEVER == null? 回答1: Even you could have googled your answer: One simple way is to use the Apache Http Components HttpClient httpclient = new

问题 I have some application, which makes database requests. I guess it doesn't actually matter, what kind of the database I am using, but let's say it's a simple SQLite -driven database. Now, this application runs as a service and does some amount of requests per minute (this number might actually be huge). I'm willing to benchmark the queries to retrieve their number, maximal / minimal / average running time for some period and I wish to design my own tool for this (obviously, there are some,

问题 My python can't connect to the Internet since last time my Windows updated. When I pip something , error goes like if host.startswith('['): AttributeError: 'NoneType' object has no attribute 'startswith' It is just that I can't pip anything on the Internet, anything. And then I thought maybe something went wrong with my system, so I tried checking if "requests" worked correctly. But hosts error goes like r = requests.get('http://www.baidu.com') Traceback (most recent call last): File "<stdin>

问题 I have problem that says The specified named connection is either not found in the configuration, not intended to be used with the EntityClient provider, or not valid. My edmx file is in separate project, but that project has connection string in its app.config What could cause the problem? 回答1: Make sure the app.config is in the project which is set to be the startup project. IF I understand correctly (I hope I do!): You have two projects: ApplicationServices (Startup Project) Web.config

问题 void turnData(boolean ON) { final ConnectivityManager conman = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE); final Class conmanClass = Class.forName(conman.getClass().getName()); final Field iConnectivityManagerField = conmanClass.getDeclaredField("mService"); iConnectivityManagerField.setAccessible(true); final Object iConnectivityManager = iConnectivityManagerField.get(conman); final Class iConnectivityManagerClass = Class.forName

问题 I am currently trying to populate a MySQL5.1 database on a current Ubuntu machine with >5,000,000 entries. Due to the program's architecture, for each INSERT statement a new database connection is opened and closed. I am aware that this is an expensive operation to do, but changing this would require to change a loooot of code, so I'd rather avoid that. The problem I am facing is that after a while (usually about 12 seconds, but this number increases after some retries) this process is not

问题 I have downloaded oracle express 11g edition and installed that.Now i want to connect it from java application. Here is my Connection code :- Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@localhost:1521:example", "example","password123"); But when i am trying to connect it, it showing me following exception. java.sql.SQLException: Listener refused the connection with the following error: ORA-12505, TNS:listener

问题 Is there some hack to create a wrapper for java.sql.Connection which works with JDBC 3 and 4 (Sun added a couple of methods and new types to the interface for JDBC 4) without resorting to something which patches the source at compile time? My use case is that I need to generate a library which works with Java 5 and 6 and I'd really like to avoid creating two versions of it. 回答1: Haven't tried it but it might work. Create your class to implement the Java 6 version. It will have problem with

问题 I am new in Apache HttpClient , I used the following code to get the HTTP connection timeout (disconnected) after certain time interval: PostMethod method = new PostMethod(authURL); HttpClient client = new HttpClient(); HttpClientParams params= new HttpClientParams(); params.setParameter(params.CONNECTION_MANAGER_TIMEOUT, 10); //10 Nano second client.executeMethod(method); but it wait for more than one minute without any hope to timeout/disconnect? Where can the problem be? 回答1: There are 2

问题 I am building an application in java using Cassandra's CQL driver. I am able to run it properly when I use local cassandra server. However the same code when I try to run is not working for remote cassandra server. It gives the following error during initialization :- Following are the maven dependecy that I am using for CQL driver:- <dependency> <groupId>com.datastax.cassandra</groupId> <artifactId>cassandra-driver-core</artifactId> <version>2.1.3</version> </dependency> <dependency>