search for: getconnect

I was wondering if there was a function like "does connection exists" ? I am currently using loops to build up a database, and I have either > B = getConnection(localization) Error in getConnection(localization) : there is no connection -2147483648 In addition: Warning message: In getConnection(localization) : NAs introduced by coercion or > B = scan(localization) Error in file(file, "r") : cannot open the connection In addition: Warning...

Hi, I use the functions socketConnections() and getConnection() which are working fine. Thanks to the authors. After opening nicely some socketConnection, getConnection(3) returns something like : description class mode text opened can read can write "->127.0.0.1:7496" "socket" "wb" "binary" &quo...

...api defined in Rinternals.h. I have code that looks like this (inspired from do_serializeToConn) : SEXP serialize_to_connection( SEXP xp, SEXP connection ){ Rconnection con ; struct R_outpstream_st out; R_pstream_format_t type = R_pstream_binary_format ; SEXP (*hook)(SEXP, SEXP) = NULL ; con = getConnection(Rf_asInteger(connection)); R_InitConnOutPStream(&out, con, type, 0, hook, R_NilValue ); return R_NilValue ; } The problem I have is that I cannot actually call getConnection since it is not part of the api. Is there another way to get the Rconnection that is associated with a number. Ma...

Hello R developers, I am working on the "seqinr" package and I encounter a tricky problem using a C function. We defined a C fonction called "getzlibsock" which is dedicated to compressed socket connections. This function is using the R internal C function called "getConnection(int)" in order to get information about the socket previously opened with the dedicated R functions. The program works fine on several platform: -Unix (SunOS), -MacOS and -Linux (some). However, on Linux, an error occurs depending on the installation. I tried to play with the Makevars fi...

When I originally implemented connections in R 1.2.0, I followed the model in the 'Green Book' closely. There were a number of features that forced a particular implementation, and one was getConnection() that allows one to recreate a connection object from a number. I am wondering if anyone makes use of this, and if so for what? It would seem closer to the R philosophy to have connection objects that get garbage collected when no R object refers to them. This would allow for example rea...

...t balance between opening up the internals to package writers and not allowing them to do bad things. My first attempt at cracking this nut is to just memcpy() the Rconnection and not allow access to the private stuff: /* Alternative to allowing C code access to connection API. */ Rconnection R_GetConnection(Rconnection ucon, int idx){ Rconnection rcon; /* Valid connection? */ if ((rcon = getConnection(idx)) == NULL) return NULL; memcpy(ucon,rcon,sizeof(struct Rconn)); /* Don't reveal private data */ ucon->private = NULL; return ucon; } This wo...

As far as I can tell, 'isOpen' cannot return FALSE in the case when 'rw = ""'. If the connection has already been closed by 'close' or some other function, then isOpen will produce an error. The problem is that when isOpen calls 'getConnection', the connection cannot be found and 'getConnection' produces an error. The check to see if it is open is never actually done. This came up in some code where I'm trying to clean up connections after successfully opening them. The problem is that if I try to close a connecti...

Hello all, I would like to request that getConnection() and the struct Rconn declarations be added to the R embedded interface. Here's why. It's common in CGI scripts for web applications to direct stdin, stdout, and stderr map to reading from the browser, writing to the browser, and writing to a web log file respectively; very nice and...

...le library("RJDBC") drv<-JDBC("oracle.jdbc.OracleDriver","/home/oracle/lib/ojdbc6.jar", "'") dbCheck = function(url, user='', pwd='') { j = .jcall("java/sql/DriverManager", "Ljava/sql/Connection;", "getConnection", url, user, pwd, check=FALSE) x = .jgetEx() .jcheck() x } dbCheck("jdbc:oracle:thin:@192.168.3.10:1521:psrndpt1","myuser","mypass") When I run the file - sometimes it works, returning NULL, and sometimes it hangs for between 1 and 2.5 minutes...

...gt; res <- dbSendQuery(con, "Select LinieID, AvgSpeed from speedlinietur order by LinieID, AvgSpeed") > out <- dbApply(res, INDEX = "LinieID",FUN = function(x, grp) quantile(x$AvgSpeed, names=FALSE)) Error in mysqlDBApply(res, ...) : couldn't find function "dbGetConnection" > I saw in an earlier posting that: There has been a change in function names in the new RMySQL 0.5-0 version (also in the new ROracle and RSQLite). The reason is that the R-SIG-DB has agreed on a common interface to all databases, and as part of this new common interface, most...

...connection driver available for No connection for URI xen:/// Thu, 15 Mar 2012 10:17:55 DEBUG Traceback (most recent call last): File "/usr/bin/virt-install", line 1004, in <module> sys.exit(main()) File "/usr/bin/virt-install", line 984, in main conn = cli.getConnection(options.connect) File "/usr/lib/python2.6/site-packages/virtinst/cli.py", line 327, in getConnection conn = open_connection(uri) File "/usr/lib/python2.6/site-packages/virtinst/cli.py", line 342, in open_connection open_flags) File "/usr/lib64/python2.6/sit...

...connection driver available for No connection for URI xen:/// Thu, 15 Mar 2012 10:17:55 DEBUG Traceback (most recent call last): File "/usr/bin/virt-install", line 1004, in <module> sys.exit(main()) File "/usr/bin/virt-install", line 984, in main conn = cli.getConnection(options.connect) File "/usr/lib/python2.6/site-packages/virtinst/cli.py", line 327, in getConnection conn = open_connection(uri) File "/usr/lib/python2.6/site-packages/virtinst/cli.py", line 342, in open_connection open_flags) File "/usr/lib64/python2.6/sit...

On Thu, Dec 14, 2017 at 7:56 PM, Gabriel Becker <gmbecker at ucdavis.edu> wrote: > Gabor, > > You can grab the connection and destroy it via getConnection and then a > standard close call. Yeah, that's often a possible workaround, but since this connection was opened by readLines() internally, I don't necessarily know which one it is. E.g. I might open multiple connections to the same file, so I can't choose based on the file name....

...t; "yes" 2 "stderr" "terminal" "w" "text" "opened" "no" "yes" 3 "a.txt" "file" "w" "text" "opened" "no" "yes" > con <- getConnection(3) > identical(con, fh) [1] TRUE ISSUE: The problem with the current design/implementation where connections are referred to by their index (only), is that (i) the table of connections changes over time and (ii) connection indices are recycled. Because a `connection` object holds the con...

Consider this code. This is R 3.4.2, but based on a quick look at the NEWS, this has not been fixed. tryCatch( readLines(tempfile(), warn = FALSE)[1], error = function(e) NA, warning = function(w) NA ) rm(list=ls(all.names = TRUE)) gc() showConnections(all = TRUE) If you run it, you'll get a connection you cannot close(), i.e. the last showConnections() call prints: ?

Hello, i installed a Xen 3.3 on Fedora 7 successfully I booted system with xen 3.3. checked using the command uname -r but while starting xend i will get an error please help me out this... error is as: ImportError: /usr/lib/python/xen/lowlevel/xs.so thanks in advance _______________________________________________ Xen-users mailing list

...llowing error occurs  ERROR    unable to connect to ''localhost:8000'': Connection refused Traceback (most recent call last):   File "/usr/sbin/virt-install", line 780, in <module>     main()   File "/usr/sbin/virt-install", line 530, in main     conn = cli.getConnection(options.connect)   File "/usr/lib/python2.6/site-packages/virtinst/cli.py", line 127, in getConnection     return libvirt.open(connect)   File "/usr/lib/python2.6/site-packages/libvirt.py", line 159, in open     if ret is None:raise libvirtError(''virConnectOpen() fai...

...new guest (hvm) by the virt-install i got the next message: Wed, 23 Sep 2009 12:02:15 ERROR virConnectOpen() failed Traceback (most recent call last): File "/usr/sbin/virt-install", line 560, in ? main() File "/usr/sbin/virt-install", line 348, in main conn = cli.getConnection(options.connect) File "/usr/lib/python2.4/site-packages/virtinst/cli.py", line 92, in getConnection return libvirt.open(connect) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 123, in open if ret is None:raise libvirtError(''virConnectOpen() fa...

...B2Driver","someClassPath.jar","'") conn <- dbConnect(driverClass,"serverName") etc etc } I get this error > data <-getData() Exception in thread "main" java.sql.SQLException: No suitable driver at java.sql.DriverManager.getConnection(DriverManager.java:545) at java.sql.DriverManager.getConnection(DriverManager.java:171) Error in .local(drv, ...) : Unable to connect JDBC to serverName Can anyone help me? Thank you Zava -------------------------------------------------------- This is not an offer (or solicitati...

...ting the ''Class Not Found'' exception. Can someone point what I am doing wrong? java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:200) ... java.sql.SQLException: No suitable driver at java.sql.DriverManager.getConnection(DriverManager.java:545) at java.sql.DriverManager.getConnection(DriverManager.java:171) ... Thanks. -- Posted via http://www.ruby-forum.com/. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Ruby on R...