error-handling

问题 How can I fetch the corresponding warning identified after the query execution as in: connection.query( squery, function(err, rows){ ... // search for OkPacket in 2 dimension array var warningCounter = okPacket.warningCount; if ( warningCounter > 0 ){ ??? } }); 回答1: Execute the query: SHOW WARNINGS Here is more on SHOW WARNINGS Syntax 来源： https://stackoverflow.com/questions/22962635/how-can-i-fetch-the-warnings-after-node-mysql-queries

问题 How can I fetch the corresponding warning identified after the query execution as in: connection.query( squery, function(err, rows){ ... // search for OkPacket in 2 dimension array var warningCounter = okPacket.warningCount; if ( warningCounter > 0 ){ ??? } }); 回答1: Execute the query: SHOW WARNINGS Here is more on SHOW WARNINGS Syntax 来源： https://stackoverflow.com/questions/22962635/how-can-i-fetch-the-warnings-after-node-mysql-queries

问题 I have recently started digging into error handling in Powershell and I noticed something that I do not really understand (I cannot tell where this behaviour is coming from). I have a simple function, which checks for domain name using [System.Net.DNS]::GetHostByName() If this variable gets passed a non-existing host, it throws a nasty error Exception calling "GetHostByName" with "1" argument(s): "No such host is known" I then want to catch the error and do some cosmetics around it $Error[0]

问题 What events can cause ferror() to return non-zero and after what events should one check ferror() ? http://www.cplusplus.com/reference/cstdio/ferror/ Opening, reading, closing? Will the return value of ferror() ever change spontaneously? E.g., if a program checks ferror(stream) , takes a nap without interacting with the FILE object associated with stream , and then checks ferror(stream) again, will the return value ever be different? Is any of this mandated by standards? 回答1: It is primarily

问题 I have some XML file i want to validate and i have to do it with Python. I've tryed to validate it with XSD with lxml. But i get only one error which occurs first but i need all errors and mismatches in XML file. Is there any method how i can manage to get list of all errors with lxml? Or are there any other Python solutions? 回答1: The way to solve this problem was: try: xmlschema.assertValid(xml_to_validate) except etree.DocumentInvalid, xml_errors: pass print "List of errors:\r\n", xml

问题 I currently enjoy receiving email notifications when my R scripts have finished running, thanks to the mail package. However, I would like to know if it's possible to have R (or RStudio, or something else) notify me if a script fails to finish running because it has encountered an error? Email would be the best delivery method. This would be extremely useful when I'm running code on a remote machine, or when I'm away from my computer. 回答1: Get a pushbullet message: http://cran.r-project.org

问题 I currently enjoy receiving email notifications when my R scripts have finished running, thanks to the mail package. However, I would like to know if it's possible to have R (or RStudio, or something else) notify me if a script fails to finish running because it has encountered an error? Email would be the best delivery method. This would be extremely useful when I'm running code on a remote machine, or when I'm away from my computer. 回答1: Get a pushbullet message: http://cran.r-project.org

问题 I use Git to deploy my web application. So in Teamcity I prepare my application (compilation, minify JS and HTML, delete unused files, etc...) and then I have a Powershell build step : $ErrorActionPreference = "Stop" git init git remote add origin '%env.gitFolder%' git fetch git reset --mixed origin/master git add . git commit -m '%build.number%' git push origin master But if an exception throw, the script continue (even if I set $ErrorActionPreference = "Stop" ) and the build is successful.

问题 I use Git to deploy my web application. So in Teamcity I prepare my application (compilation, minify JS and HTML, delete unused files, etc...) and then I have a Powershell build step : $ErrorActionPreference = "Stop" git init git remote add origin '%env.gitFolder%' git fetch git reset --mixed origin/master git add . git commit -m '%build.number%' git push origin master But if an exception throw, the script continue (even if I set $ErrorActionPreference = "Stop" ) and the build is successful.

问题 In order to handle Spark exception on RDD operations I can use the following approach with additional exceptions column: val df: DataFrame = ... val rddWithExcep = df.rdd.map { row: Row => val memberIdStr = row.getAs[String]("member_id") val memberIdInt = Try(memberIdStr.toInt) match { case Success(integer) => List(integer, null) case Failure(ex) => List(null, ex.toString) } Row.fromSeq(row.toSeq.toList ++ memberIdInt) } val castWithExceptionSchema = StructType(df.schema.fields ++ Array