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SQL - Update multiple records in one query
... config t2
ON t1.config_name = 'name1' AND t2.config_name = 'name2'
SET t1.config_value = 'value',
t2.config_value = 'value2';
Here is SQLFiddle demo
or conditional update
UPDATE config
SET config_value = CASE config_name
WHEN 'name1' THEN 'value'
...
How can I catch a “catchable fatal error” on PHP type hinting?
...table state. If the error is not caught by a user defined handle (see also set_error_handler()), the application aborts as it was an E_ERROR.
see also: http://derickrethans.nl/erecoverableerror.html
e.g.
function myErrorHandler($errno, $errstr, $errfile, $errline) {
if ( E_RECOVERABLE_ERROR===...
Install go with brew, and running the gotour
...ate Directories
mkdir $HOME/Go
mkdir -p $HOME/Go/src/github.com/user
2) Setup your paths
export GOPATH=$HOME/Go
export GOROOT=/usr/local/opt/go/libexec
export PATH=$PATH:$GOPATH/bin
export PATH=$PATH:$GOROOT/bin
3) Install Go
brew install go
4) "go get" the basics
go get golang.org/x/tools...
How to show SQL queries run in the Rails console?
...this line in the console:
ActiveRecord::Base.connection.instance_variable_set :@logger, Logger.new(STDOUT)
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disable maven download progress indication
...
If you want also to get rid of the "Downloading/Downloaded" lines you can set the corresponding logger org.apache.maven.cli.transfer.Slf4jMavenTransferListener to a level higher than info. Therefore I used the org.slf4j.simpleLogger.log property as documented here.
Using only the command line, you...
Where is nodejs log file?
...app-root-path');
const winston = require('winston');
// define the custom settings for each transport (file, console)
const options = {
file: {
level: 'info',
filename: `${appRoot}/logs/app.log`,
handleExceptions: true,
json: true,
maxsize: 5242880, // 5MB
maxFiles: 5,
...
How can I clear event subscriptions in C#?
...
From within the class, you can set the (hidden) variable to null. A null reference is the canonical way of representing an empty invocation list, effectively.
From outside the class, you can't do this - events basically expose "subscribe" and "unsubscribe...
Size of character ('a') in C/C++
...e value equal to the
representation of c-char in the execution character set. If c-char is
not representable as a single byte in the execution character set, the
literal has type int and implementation-defined value.
So, in C++ character literal is a type of char. so, size of character liter...
How to verify that method was NOT called in Moq?
...
... or Callback() to set some flag that can be asserted.
– alex
Feb 11 '09 at 16:27
2
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what's the difference between “hadoop fs” shell commands and “hdfs dfs” shell commands?
.../parent/child or simply as /parent/child (given that your
configuration is set to point to hdfs://namenodehost).
Most of the commands in FS shell behave like corresponding Unix commands. Differences are described with each of the commands. Error information is
sent to stderr and the output is sent ...