connection

问题 I think that my application is cursed, debug goes where it wants and I don't know why. Line by line debugging seems to analyze also the commented rows. I think that the problems are on my Connection method, I see a significant performance slowdown, and at the third (or fourth nvm) connection I get this error: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too many connections I'm sure that I close the connection each time I've access to the DB (with finally statement

问题 I am looking for a piece of code that would check network connectivity, of an Android device, including tethering, not only the wireless channels. I have spent hours online looking for such a thing, but without any result! All the functions I found out manage only wireless net tests. Nothing with tethering. So is it at least possible? Do you have some corresponding? 回答1: this checks if Tethering is enabled. Cut from a class I changed to get adbWireless working over a tethered connection: //

问题 In my winform application - framework 3.5 sp1 - I have a custom Data-Reader. I have to choose the way to close the connection First way: Private cn As OleDb.OleDbConnection = Nothing Public Sub Open() cn = New OleDb.OleDbConnection(sConnectionString) cn.Open() ' ... End Sub Public Sub Close() ' ... cn.Close() cn.Dispose() End Sub Second way: Public Sub Open() Dim cn As New OleDb.OleDbConnection(sConnectionString) cn.Open() ' ... End Sub Public Sub Close() ' ... End Sub In the second way is

问题 I have a Java Swing application that accesses a Postgres database using a simple Singleton Pattern: public class DatabaseConnection { private static final String uname = "*******"; private static final String pword = "*******"; private static final String url = "*******************************"; Connection connection; // load jdbc driver public DatabaseConnection(){ try{ Class.forName("org.postgresql.Driver"); establishConnection(); } catch (ClassNotFoundException ce) { System.out.println(

问题 I'm developing the real-time multiplayer game and I want to create fast and optimized interface between client and server sockets. Client will send to server next information via socket: authorization information like login, password; simple commands like: moveToPoint(coords) shootInDirection(coords) dropItem(item,coords) etc... These commands(requests) have to be handled by server and transmitted to other clients; The main question is: How to design the structure of commands which client

问题 I'm developing the real-time multiplayer game and I want to create fast and optimized interface between client and server sockets. Client will send to server next information via socket: authorization information like login, password; simple commands like: moveToPoint(coords) shootInDirection(coords) dropItem(item,coords) etc... These commands(requests) have to be handled by server and transmitted to other clients; The main question is: How to design the structure of commands which client

问题 Based on the simple implementation of Meteor Cluster MicroServices the doc I have this implementation for 2 services to communicate. AppUI export default CLUSTER_DISCOVERY_URL="mongodb://localhost:3000/meteor"; Cluster.connect(CLUSTER_DISCOVERY_URL); Cluster.register('appui_service'); loggerService = Cluster.discoverConnection('logger_service'); LoggerService export default CLUSTER_DISCOVERY_URL="mongodb://localhost:3300/meteor"; Cluster.connect(CLUSTER_DISCOVERY_URL); Cluster.register(

问题 I've configured Windows 6 Professional Mobile Emulator, and am trying to get an Internet connection on it. Currently when I browse to any address, I get my local box's IIS, and no outside addresses. On my box: I have Virtual PC 2007 installed. I have, so far, in my Visual Studio .Net app, cradle the device emulator. Allowed connections to DMA (Control Panel/Windows Mobile Device Center/Allow connections to one of the following: DMA) In the Emulator: Settings/Connections/Advanced/Selected

问题 public static void baglanti(){ OracleDataSource ods; //String driverName = "oracle.jdbc.driver.OracleDriver"; try { ods = new OracleDataSource(); ods.setURL("jdbc:oracle:thin:@//aaaaaa:2122/XXXXX"); ods.setUser("aaaa"); ods.setPassword("aaaa"); Connection conn=ods.getConnection(); Statement st=conn.createStatement(); ResultSet rs=st.executeQuery("SELECT DESCRIPTION FROM example"); while (rs.next()) { //rs.getString("ID"); System.out.println("DESC : "+rs.getString("1")); } } catch

问题 I have created a random topology in ned file. In that topology, every node has the same radian connection distance. I want to make connections for every node that is in the rc distance. This is as far I have get: network ranTop { parameters: int n = 100; int rc = 5; volatile int posX = intuniform (0,100); volatile int posY = intuniform (0,100); submodules: node[n] : Node { parameters: @display("p=$posX,$posY"); } } 回答1: You should have (non volatile!) posX , posY parameter for each node and