connection

Connecting PostgreSQL with R

南楼画角 提交于 2019-12-04 05:55:03
问题 I'm trying to make a connection to PostgreSQL database in R. I'm writing this drv <- dbDriver("PostgreSQL") But in result i have an error: Error: Couldn't find driver PostgreSQL. Looked in: * global namespace * in package called PostgreSQL * in package called RPostgreSQL What am I doing wrong? 回答1: drv <- DBI::dbDriver("PostgreSQL") gives me the same error but loading RPostgreSQL library("RPostgreSQL") before making the connection solves it. 回答2: Package Issue drv <- DBI::dbDriver("PostgreSQL

Can't deploy window phone apps to Emulator. Error DEP6100 & 6200

拈花ヽ惹草 提交于 2019-12-04 05:34:00
I create new default project Window Phone, then run it with Emulator Window Phone but it's not work however emulator started. I use Window 8.1 64bit with Visual Studio Professional 2013 - Update 4 Error say: Error 1 DEP6100 : The following unexpected error occurred during boostrapping stage 'Connecting to the device': SmartDeviceException - A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond Error 2 DEP6200 : Boostrapping 'Emulator 8.1 WVGA 4 inch 512MB' failed.

ftp doesn't download the file properly in java?

你离开我真会死。 提交于 2019-12-04 05:04:04
When i download file with following code it just write the file to destination on local but file size are all zero. Can anybody say Why this happen and how to fix it? import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import java.io.FileOutputStream; import java.io.IOException; public class FtpDownload { public static void main(String[] args) { FTPClient client = new FTPClient(); FileOutputStream fos = null; String filename = "config.zip"; try { client.connect("ftpsrv"); client.login("user", "user"); for (FTPFile file : client.listFiles()) { filename = "C:\

How to allow more concurrent client connections with Netty?

旧城冷巷雨未停 提交于 2019-12-04 05:03:27
First, thanks all the Netty contributors for the great library. I have been happily using it for several weeks. Recently, I started to load test my system but now I'm experiencing some scalability problem with Netty. I tried to fork as many simultaneous Netty clients as possible to connect to a Netty server. For small number of clients (<50), the system just works fine. However, for large number of clients (>100), I find the client side always prompts the "ClosedChannelException": java.nio.channels.ClosedChannelException at org.jboss.netty.channel.socket.nio.NioClientSocketPipelineSink$1

pycharm debugger not connecting: KeyboardInterrupt

喜你入骨 提交于 2019-12-04 04:57:52
Somehow my pycharm debugger doesn't connect anymore . I tested all ENV. Also, reading up on it on stackoverflow: I deleted the .idea directory . However, after restarting the pycharm .idea is always recreated (deleted caches and even deleted&downlaoded pycharm again) **/Library/Frameworks/Python.framework/Versions/3.6/bin/python3.6 "/Applications/PyCharm CE.app/Contents/helpers/pydev/pydevd.py" --multiproc --qt-support --client 127.0.0.1 --port 52281 --file /Users/franzi/Desktop/i18n/qordoba-cli/qordoba/cli.py i18n-find --traceback warning: Debugger speedups using cython not found. Run '"

Why do I see NotUpdatable when I invoke ResultSet.refreshRow()?

主宰稳场 提交于 2019-12-04 04:44:12
问题 When I invoke following rows: Statement statement = connection.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_READ_ONLY); ResultSet resultSet = statement.executeQuery("select * from user"); resultSet.next(); resultSet.refreshRow();//exception throws here I see following exception: com.mysql.jdbc.NotUpdatable: Result Set not updatable.This result set must come from a statement that was created with a result set type of ResultSet.CONCUR_UPDATABLE, the query must select only

urllib3 connectionpool - Connection pool is full, discarding connection

|▌冷眼眸甩不掉的悲伤 提交于 2019-12-04 04:03:33
问题 does seeing the urllib3.connectionpool WARNING - Connection pool is full, discarding connection mean that I am effectively loosing data (because of lost connection) OR Does it mean that connection is dropped (because pool is full); however, the same connection will be re-tried later on when connection pool becomes available? 回答1: Does it mean that connection is dropped (because pool is full); however, the same connection will be re-tried later on when connection pool becomes available? ^ This

Should a server adhere to the HTTP Connection: close header sent from a client?

房东的猫 提交于 2019-12-04 04:00:50
I have a HTTP client that sets the Connection header to the following value when I make a request: Connection: close However when the server sends a response, it is setting the header to Keep-Alive: Connection: Keep-Alive This seems intuitively wrong to me, and I am wondering how the client should handle such a response from the server? Also why would a server respond with Keep-Alive, when the client has asked for the connection to be closed, is this valid? According to the HTTP RFC: "HTTP/1.1 defines the "close" connection option for the sender to signal that the connection will be closed

VBA - Remove Password from OLEDB Connection String

一笑奈何 提交于 2019-12-04 03:50:02
I have an excel file that contains a series of OLEDB connections leveraged by several pivot tables. I would like to create a VBA function that removes all password from that several connection string as the file is closed(so that the users password will not be persisted). First I thought all I need to do was set the "Save Password" property to false, something like this: Public Sub RemovePasswordByNamePrefix() Dim cn As Object Dim oledbCn As OLEDBConnection For Each cn In ThisWorkbook.connections Set oledbCn = cn.OLEDBConnection oledbCn.SavePassword = False Next End Sub Should work right, on

Is there any way to detect network connection type using javascript? [duplicate]

徘徊边缘 提交于 2019-12-04 03:42:42
问题 This question already has answers here : How do I check connection type (WiFi/LAN/WWAN) using HTML5/JavaScript? (4 answers) Closed 15 days ago . I would like to know is there any way to check if user is connected from 2G, 3G, 4G, or WiFi using javascript. As of my knowledge only Mozilla provides a Network Information API which helps to detect general connection type like 'wifi', 'cellular' etc. 回答1: It is a wrong approach to expose your network to javascript. Anyways for your better