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MySQL Error 1215: Cannot add foreign key constraint

I am trying to forward engineer my new schema onto my db server, but I can't figure out why I am getting this ... , PRIMARY KEY (`Emp_ID`) ) ENGINE = InnoDB Question&Answers:os...

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java - JPA JoinColumn vs mappedBy

What is the difference between: @Entity public class Company { @OneToMany(cascade = CascadeType.ALL , fetch = FetchType ... private List<Branch> branches; ... } Question&Answers:os...

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c - How to debug using gdb?

I am trying to add a breakpoint in my program using b {line number} but I am always getting an error that says: ... . Use the "file" command. What should I do? Question&Answers:os...

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python - Pandas groupby with delimiter join

I tried to use groupby to group rows with multiple values. col val A Cat A Tiger B Ball B Bat import pandas as pd ... B-a-t What is the issue here ? Thanks, AP Question&Answers:os...

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recovery - How to recover a dropped stash in Git?

I frequently use git stash and git stash pop to save and restore changes in my working tree. Yesterday I had ... m asking because there must be an easier way! Question&Answers:os...

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url - Can I change all my http:// links to just //?

Dave Ward says, It's not exactly light reading, but section 4.2 of RFC 3986 provides for fully qualified ... -browser compatible? Are there any other caveats? Question&Answers:os...

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python 3.x - Concatenate strings from several rows using Pandas groupby

I want to merge several strings in a dataframe based on a groupedby in Pandas. This is my code so far: import ... in the column "text". Any help appreciated! Question&Answers:os...

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c# - How can I change property names when serializing with Json.net?

I have some data in a C# DataSet object. I can serialize it right now using a Json.net converter like ... get it added to the official documentation. Thanks! Question&Answers:os...

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jsp - javax.el.PropertyNotFoundException: Property 'foo' not found on type com.example.Bean

I have results from Query query = session.createQuery("From Pool as p left join fetch p.poolQuestion as s"); ... PS. the ${pool.name} is displayed properly Question&Answers:os...

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performance - INC instruction vs ADD 1: Does it matter?

From Ira Baxter answer on, Why do the INC and DEC instructions not affect the Carry Flag (CF)? Mostly, I stay ... INC doesn't update CF. But why it matters? Question&Answers:os...

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regex - In Python, how do I split a string and keep the separators?

Here's the simplest way to explain this. Here's what I'm using: re.split('W', 'foo/bar spam eggs') ... tokens, manipulate it, then put it back together again. Question&Answers:os...

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c++ - How can I convert a std::string to int?

Just have a quick question. I've looked around the internet quite a bit and I've found a few solutions but ... for such a small problem though. Any ideas? Question&Answers:os...

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python - permutations with unique values

itertools.permutations generates where its elements are treated as unique based on their position, not on their ... I should have described the actual problem. Question&Answers:os...

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python - How to convert an integer to a string in any base?

Python allows easy creation of an integer from a string of a given base via int(str, base). I want to ... integer to the shortest url-safe string in Python? Question&Answers:os...

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c# - Virtual member call in a constructor

I'm getting a warning from ReSharper about a call to a virtual member from my objects constructor. Why would this be something not to do? Question&Answers:os...

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Are HTTP headers case-sensitive?

In a blog post I use the following PHP to set the content-type of a response: header('content-type: ... Or does it just work because browsers are nice? Question&Answers:os...

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html - Multiple inputs with same name through POST in php

Is it possible to get multiple inputs of the same name to post and then access them from PHP? The idea is this: ... the array of items with the name "xyz". Question&Answers:os...

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git - Reset local repository branch to be just like remote repository HEAD

How do I reset my local branch to be just like the branch on the remote repository? I did: git reset --hard HEAD ... files? If I did, I want to remove those. Question&Answers:os...

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Is there a concise way to iterate over a stream with indices in Java 8?

Is there a concise way to iterate over a stream whilst having access to the index in the stream? String[] names ... the zip has either moved or been removed... Question&Answers:os...

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How do I use cascade delete with SQL Server?

I have 2 tables: T1 and T2, they are existing tables with data. We have a one to many relationship between ... ID - 2009 Review Employee ID - 2010 Review Question&Answers:os...

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regex - Regular expression for floating point numbers

I have a task to match floating point numbers. I have written the following regular expression for it: [-+]?[0-9 ... . also. Please correct me where I am wrong. Question&Answers:os...

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validation - RegEx for matching UK Postcodes

I'm after a regex that will validate a full complex UK postcode only within an input string. All of the uncommon ... WC2H 7LTa WC2H How do I solve this problem? Question&Answers:os...

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c# - What is the difference between task and thread?

In C# 4.0, we have Task in the System.Threading.Tasks namespace. What is the true difference between Thread ... earlier, kindly give the reference of the link. Question&Answers:os...

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sql - Best way to do multi-row insert in Oracle?

I'm looking for a good way to perform multi-row inserts into an Oracle 9 database. The following works in MySQL but doesn' ... ', '28-AUG-2008', '28-AUG-2008'); Question&Answers:os...

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python - Normal arguments vs. keyword arguments

How are "keyword arguments" different from regular arguments? Can't all arguments be passed as name=value instead of using positional syntax? Question&Answers:os...

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c# - How do I suspend painting for a control and its children?

I have a control which I have to make large modifications to. I'd like to completely prevent it from ... suspend painting for a control and its children? Question&Answers:os...

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Can I call a constructor from another constructor (do constructor chaining) in C++?

As a C# developer I'm used to running through constructors: class Test { public Test() { DoSomething(); } public ... using the 'this' keyword, but both fail. Question&Answers:os...

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Clear terminal in Python

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