Json Convert empty string instead of null

JSON
I'm trying to serialize my struct so that the strings that didn't get a value get their default value "" instead of null [JsonProperty(PropertyName =...
8 months ago

how to return item load in scrapy loop

JSON
The code is as below , every time it returns only the first loop ,the last 9 loops disapeared .So what should I do to get all the loops ? I have trie...
8 months ago

Piping 2 grep commands into wc

Linux
I have a file called a.txt that is 100 lines long. grep rake a.txt | wc #returns 10 lines grep -v rake a.txt | WC #returns 90 lines grep Rake a.txt...
8 months ago

Catching SIGSEGV when triggered by corrupt stack

Linux
I've been working on some buggy code and wanted to install a SIGSEGV handler to get more information about the crash. However, I noticed that my handl...
8 months ago

Is QEMU good for learning programming in assembler for ARM and PowerPC?

Linux
I want to learn programming in assembler for PowerPC and ARM, but I'm unable to buy real hardware for this purpose. I'm thinking about using QEMU for ...
8 months ago

How to open port in centOS

Linux
I have installed and web application which is running on port 8080 on centOS. I only have command line access (through putty) to that machine. I have ...
8 months ago

Solr server memory and disk space

Linux
Context: I have an AWS EC2 instance 8Gb RAM 8Gb of disk space It runs Solr 5.1.0 with Java Heap of 2048Mb -Xms2048m -Xmx2048m Extra: (updat...
8 months ago

Find the IP address of the client in an SSH session

Linux
I have a script that is to be run by a person that logs in to the server with SSH. Is there a way to find out automatically what IP address the user ...
8 months ago

awk save modifications inplace

Linux
I am learning awk and I would like to know if there is an option to write changes to file, similar to sed where I would use -i option to save modifica...
8 months ago

How to separate a string and re build it

MySQL
Separating String list and replacing same list with new values in mysql I have following data in my table_1 Table table_1(Currently saved structure) ...
8 months ago

Nodejs Cluster with MySQL connections

MySQL
Looking on advice on clustering of Nodejs and the method of connection to mysql server. Do we open one connection for each child process or just one s...
8 months ago

Output isn't ordered properly

MySQL
How to order the result by C, D, A, B and pincode chronologically? Original result : S Pincode == ======= A 001 B 002 C 003 D 004 D 005 C 006...
8 months ago

MySQL Deleting duplications

MySQL
I want to sort my database duplicates out via 'Telephone' I can only seem to delete them all instead of keeping one of the numbers My code currently...
8 months ago

MySQL Query to XML output

MySQL
Is there a framework current out there that allows you to take MYSQL query output and convert it all into XML?
8 months ago

how to input new string if there have value except zero

MySQL
i need help. can somebody tell me about concept and example code i need use? the case is, I want input game history using java into mysql (phpmyadmin)...
8 months ago

query without derived table

MySQL
I have two tables flat and usertoflat I want to fetch all data from flat table with where condition on usertoflat table. I am using JPA but I didn't ...
8 months ago

Mysql: Change status of all child records if status of parent is updated

MySQL
I have 2 tables 1. Parent Parent_ID(PK)| name | status -------------------------------- 1 |parent 1 |enable 2 |parent 2 |en...
8 months ago

Get the week number of the month from week number of the year

Node.js
I am having a function that is returning the current week of the year like 43,45 etc. what I want is that to get it as week 1 week 2, for the curren...
8 months ago

What does => mean in node js

Node.js
I am learning node js, and came across '=>' several times, however struggle to understand what this means. Here is an example: app.post('/add-it...
8 months ago

Error with passportjs: Unknown authentication strategy "local"

Node.js
I am developing a nodejs application and using passportjs for authentication. I am using local strategy of passport. But when I try to login, I am get...
8 months ago