## Is SQL Injection Possible without double and single quotes?

Let’s assume we’re building a SQL query like this:
`SELECT * FROM users WHERE username = 'Username' AND password='password'`
If we blocked the characters `"` and `'`, will an attacker be able to hack into it at all?

Here’s my regex statement `/[\"\']/` and if there are any matches it will block the request. I’m also trying to avoid using MySQLi prepare.

## What are the costs of using Double Slice?

I’m a bit confused about the double slice feat. Does it now cost 1 or 2 actions to use it? And what are the penalties now when you use it with agile and non-agile weapons?

## Damage Resistance / Vulnerability: Double Damage or Dice?

When dealing with monsters who have resistance or vulnerability to a specific damage type, I’ve been having my players roll the expected damage and I’ll half or double it behind the screen. I’ve recently found a DM who tells the players outright if the monster is resistant or vulnerable, and, given the example of vulnerability, has them roll double dice instead of doubling the damage.

Is there a right way to deal with resistance and vulnerability, or is this one of those “DM Discretion/Preference” things?

## Unable to double tap on the trackpad to highlight multiple words in macOS Mojave

In previous versions of OS X, I was able to “double tap” on the trackpad and then move my finger to the side or down to highlight/select text/multiple text.

I’m unable to duplicate this in the new macOS Mojave. Previously, I’d enable System Preferences > Trackpad > “Tap to click”. Any ideas?

## Docker: Showing double prompt on power shell and grey text: can’t exit

I am trying to learn docker. I opened a power shell and typed some commands from a tutorial and then I right clicked the mouse. The power shell showed me scrolling of the command window and now its showing me double angle brackets and whatever I am typing its visible in grey.[![power shell][1]][1]

I typed: “>>” quit “>>” exit

But no effect. I can’t come out of that window. Some body please guide me.Sorry I don’t know exact forum for it. Please guide me.

Zulfi.

## Computing double coset operators in a computer algebra system

I want to do double coset operators computations on modular forms of half integer weight and with character such as the trace operators that map modular forms of congruence subgroups $$\Gamma_0(N)$$ to modular forms of $$\Gamma_0(M)$$ where $$M$$ divides $$N$$. I know that there are commands in SAGE and PARI/GP that can compute action of certain Hecke operators (using modular symbols and trace formulas respectively).

However, can I compute action of arbitrary double coset operators using such computer algebra systems (in particular the trace operator mentioned above)?

## Advantage on initiative/never surprised or double fire damage? [on hold]

I’m playing a super beefy multiclass lv6 barbarian zealot/lv9 cleric of the forge domain. I’ve come to terms with what I’ll gain and lose for the most part, but there’s one trait I’m debating.

If I gain one more level in barbarian, I gain advantage on initiative and cannot be surprised in combat. However, if I do that I can’t reach lv14 cleric of the forge domain. And at lv14 I gain double fire damage per hit.

Should I sacrifice my fire damage for the advantage on rolls? Or should I stick it out for that sweet damage buff?

By the way, this is a lv15 startup character, and he’s an envoy warforged (I know not optimized, but I love the role-play aspect).

## igraph R 1.0.1 double degree count for pajek format

i’m reading an undirected graph from .net file in Pajek format. The Edges are like this:

``*Edges  123 1  61 2  61 3  104 3  .  .  2 61  3 61  .  . ``

with this code

``net <- read.graph(file="net_W18.net", format="pajek") ``

and it gives me correct an undirected named graph (UN)

``> summary(net) IGRAPH c00ce7f UN-- 294 1578 --  + attr: id (v/c), name (v/c) ``

When it comes to node Degrees, i only get multiples of 2, like every undirected edge is counted double. I mean yeah, every edge in de .net File is defined twice, once in each direction, but in an undirected graph it shouldnt count as 2. I tried this different versions:

``deg <- degree(net, mode="all", loops=FALSE) deg <- degree(net, mode="in", loops=FALSE) deg <- degree(net, mode="all") ``

but degrees are always multiples of 2.

When plotting the graph it also gives me 2 links between each node, but when i tell to plot arrows, it doesnt plot arrows.

Is this a Bug? Or do i have to set any additional property? Or is the given .net file just wrong for an undirected graph? but why is it detected as “UN” ?

## Double checked locking in golang – Why mutex.RLock() is required?

I have a piece of code which has double checked locking for initialization of an object.

``func checkSyncProducer() {     mutex.RLock()     if syncProducer == nil {         mutex.RUnlock()         mutex.Lock()         defer mutex.Unlock()         if syncProducer == nil {             syncProducer  = createSyncKafkaProducer() //this func will initialize syncProducer.         }     } else {         defer mutex.RUnlock()     } } ``

Now, this piece of code has `mutex.RLock()` before first nil check.

Why is that required? And doesn’t it add overhead becuase everytime checkSyncProducer is called read lock will be taken and released.

Should there be one more nil check before read lock?

## Cleaner way to handle double pointer in C++ BST?

I have an implementation for my first binary search tree in C++. I was wondering if there was some cleaner way to avoid using the double pointer in the way I have my code setup? Such as on one line I have:

``(*node)->left = insert(&((*node)->left),value); ``

Which seems a bit “messy”, but it almost seems necessary for the way I have implemented the BST. Maybe I am possibly missing a way I can change the syntax slightly to achieve the same result? I understand that I can have a double pointer as a parameter for my functions, but I have been told that it is not the standard in C++. I have my code posted below, along with how I am testing it.I am trying to prepare for technical interviews so any feedback is welcome.

``#include<stdio.h>  #include<stdlib.h>  #include<iostream> struct Node  {      int data;      Node *left, *right;  };   // A utility function to create a new BST node  Node* newNode(int data)  {      Node *temp =  new Node();      temp->data = data;      temp->left = NULL;      temp->right = NULL;      return temp;  }   // A utility function to do inorder traversal of BST  void inorder(Node **root)  {      if (*root != NULL)      {          inorder(&((*root)->left));          printf("%d \n", (*root)->data);          inorder(&((*root)->right));      }  }   /* A utility function to insert a new node with given key in BST */ Node* insert(Node** node, int value)  {      if(*node==NULL){         return newNode(value);     }     if((*node)->data > value){         (*node)->left = insert(&((*node)->left),value);     }     else if((*node)->data < value){         (*node)->right = insert(&((*node)->right),value);     }     return *node; }   // Driver Program to test above functions  int main()  {      /* Let us create following BST                50             /     \            30      70           /  \    /  \         20   40  60   80 */     Node *root = NULL;      root = insert(&root, 50);      insert(&root, 30);      insert(&root, 20);      insert(&root, 40);      insert(&root, 70);      insert(&root, 60);      insert(&root, 80);       // print inoder traversal of the BST      inorder(&root);       return 0;  }  ``