connection

问题 I am trying to use mysql embedded with QT. I already have a Qt mysql plugin linked against mysqld. The plugin loads fine the embedded db but QT does not have easy ways to setup embedded options like dataDir. I saw here: http://doc.qt.io/archives/qt-4.7/qsqldatabase.html#addDatabase-2 that I can initiate the QT sql driver (QMYSQLDriver) with the necessary embedded parameters so I did: #include <QtCore/QCoreApplication> #include <QtSql> #include "QMYSQLDriver" #include <mysql.h> int main(int

问题 i am working on an android application that requires to be controlled by LEAP-motion. the leap sdk currently only supports windows and mac. but is there a way (any open library/tutorial etc.) to make the leap motion device talk to an android phone? leap motion uses a USB connection to the phone , i have a usb OTG adapter and can directly plug in leap. Any sort of help will be greatly appreciated. 回答1: Introduction Ya, I know your question contains the word "directly". My solution is not

问题 Which is better for finally block: finally { try { con.close(); stat.close(); } catch (SQLException sqlee) { sqlee.printStackTrace(); } } Or: finally { try { if (con != null) { con.close(); } if (stat != null) { stat.close(); } } catch (SQLException sqlee) { sqlee.printStackTrace(); } } 回答1: Better way to use is the 2nd one, because if an exception is thrown while initializing con or stat , they won't be initialized, and might be left initialized to null . In that case, using the 1st code

问题 I have some kind of problem and I can't check this at home if its working or not. Here is the code using System; using System.Net; using System.Net.Sockets; using System.Threading; using System.IO; using System.Net.Security; class Program { private static IPAddress ipAddress = IPAddress.Parse("127.0.0.1"); private static int port = 6000; private static string data = null; static void Main(string[] args) { Thread thread = new Thread(new ThreadStart(receiveThread)); thread.Start(); Console

问题 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

问题 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

问题 Let's say I have a common method which creates a DB connection: Connection getConnection() throws SQLException { Connection con = ... // create the connection con.setAutoCommit(false); return con; } I put the setAutoCommit(false) call here so that callers of this method never have to worry about setting it. However, is this a bad practice if the operation executed by the caller is only reading data? Is there any extra overhead? My personal opinion is that it's better to centralize the logic

问题 I have copied our entire www directory from our web server to my local workstation. I am trying to get Magento to connect to a local database. Yes, I changed the connection string values in the 'magento/app/etc/local.xml' file. I have verified about a hundred times that it has been changed. And before you tell me that it is cached, I have deleted the entire 'magento/var/cache' directory, just to be safe, and grepped all files in the www directory for our 'secret_password'. Below is an excerpt

问题 I am trying to transfer bulk data on a constant and continuous based from a SQL Server database to a MYSQL database. I wanted to use SQL Server's SSMS's replication but this apparently is only for SQL Server to Oracle or IBM DB2 connection. Currently we are using SSIS to transform data and push it to a temporary location at the MYSQL database where it is copied over. I would like the fastest way to transfer data and am complication several methods. I have a new way I plan on transforming the

问题 I have some code which connects to a URL to download a file, and then performs some processing on it. However, sometimes I am receiving the error java.net.SocketException: Connection reset . I would like to retry to download the file when I receive this error, say a maximum of 3 times before giving up on it. I would like to know what would be the best way to structure this. Does the following look ok. Does it seem acceptable to place the try-catch block inside of a while loop, or is there a