connection

问题 I'm being able to connect to mysql database in localhost. But not able to connect in my server? Please can anybody help me? 回答1: To solve the error : "Unable to connect to any of the specified MYSQL hosts.", you need allow ip address in mysql server which can be done via cpanel. 来源： https://stackoverflow.com/questions/4749563/mysql-connection-with-vb-net-via-internet

问题 I use c3p0 version 0.9.5.1. The unwrap() method bug with this error : java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyStatement.unwrap(Ljava/lang/Class;)Ljava/lang/Object; is abstract at com.mchange.v2.c3p0.impl.NewProxyStatement.unwrap(NewProxyStatement.java) This is my code : com.mysql.jdbc.Statement stm = proxyStatement.unwrap(com.mysql.jdbc.Statement.class) I saw some post said that it should work since 0.9.5. Is it still a bug? How can I get the original Statement

问题 My MySQL connection throws null reference although this code worked well one year ago. The line where the debugger indicates the exception contains "connection = new MySqlConnection(connectionString);": DBConnect MySqlConnection = new DBConnect(); string[] resultArray = MySqlConnection.GetValidUser( "tbl_user", tbEmail.Text, tbPassword.Text ); //THROWS null reference exception in method 'private bool OpenConnection()' //A first chance exception of type 'System.ArgumentException' occurred in

问题 My situation is similar to - Packets out of order. Got: 80 Expected: 0 node.js (no solutions). Works fine on local machine but fails on virtual machine. Code as follows: var connection = mysql.createConnection({ host : "xxxxx", port : 22, user : "root", password : "root", database : "db" }); Error as follows: Error: Packets out of order. Got: 45 Expected: 0 at Parser.write (/home/webdev/PM/LT/node_modules/mysql/lib/protocol/Parser.js:42:19) at Protocol.write (/home/webdev/PM/LT/node_modules

问题 I am using JPA 2.0 with EclipseLink, Glassfish, and NetBeans. I am experiencing issues with connection timeouts after extended periods of inactivity. I've looked pretty hard for ways to either: (1) Check for JPA's connection and then re-establish its connection if disconnected (2) Keep the JPA's connection active as much as possible However, I can't really find a solution for either. The closest thing I can find is this post: How To modify Eclipselink JPA 2.0 connection retry behavior . If

问题 i've a locked php page (username and password) by .htaccess file, how can i do to connect to this php with my android application? My function to connect is : String conn(JSONObject json,String page){ String result = ""; String stringaFinale = ""; InputStream is = null; final int TIMEOUT_MILLISEC = 5000; // = 10 seconds HttpParams httpParams = new BasicHttpParams(); HttpConnectionParams.setConnectionTimeout(httpParams, TIMEOUT_MILLISEC); HttpConnectionParams.setSoTimeout(httpParams, TIMEOUT

问题 I have a device with Blue Gecko BLE and everything seems to be working fine with various Android phones and tablets: connecting, data transfer and reconnect after disconnection. Note: we do not pair our device it is just connected and we do not use auto connect. Now the problem: sometimes with some of the devices-phone setups connecting stops functioning after working for weeks. I do not know when or why it happens, but after that it is impossible to reconnect the device using the same phone

问题 JMS app requires seven parameters to make successful SSL connection with MQ series given here, https://github.com/ibm-messaging/mq-tls-ssl-wizard/blob/master/com.ibm.mq.ssl-wizard/src/tlswizard/samples/SSLSampleJMS.java I am trying to interpret these parameters, Conname- the connection name of the server queue manager in the same format as the CONNAME parameter on the MQSC DEFINE CHANNEL command, but without the port specified. I guess this is host name Port - the connection port of the

问题 To read in the first 5 columns of Test.csv I may go: x <- matrix(scan(pipe(paste0("cut -f1,2,3,4,5 -d, ","/home/test/Test.csv")),skip=1,sep=","),ncol=5) Then if I read it using a normal method: y <- read.csv("/home/test/Test.csv") I get the error message: Warning message: closing unused connection 3 (cut -f1,2,3,4,5 -d, /home/test/Test.csv) Is this error message a problem, and if so how do I remedy it? 回答1: I cannot replicate the warning on my system. However, you could try closing the

问题 I am supposed to connect to external server using UDP sockets in C#.. I could not understand these 2 lines in server usage notes: "Use of dedicated sockets is enforced." and "If the server looses UDP connectivity with the client, it will ..." I thought that the UDP socket is connectionless! So what did "looses connectivity" mean? and how to avoid it? Does there is a known way to ensure "dedicated sockets"? Thanks 回答1: "Use of dedicated sockets is enforced." To me this says, create one unique