In cryptography, hash functions provide three separate functions. Collision resistance: How hard is it for someone to find two messages (any two messages) that hash the same. Preimage Resistance: Given a hash, how hard is it to find another message that hashes the same? Also known as a one way hash function. Second preimage resistance: … Read more
try{ // … } catch (…) { // … } will catch all C++ exceptions, but it should be considered bad design. You can use c++11’s new current_exception mechanism, but if you don’t have the ability to use c++11 (legacy code systems requiring a rewrite), then you have no named exception pointer to use to … Read more
Strangely enough, the solution ended up being to change volumes: – ./postgres-data:/var/lib/postgresql to volumes: – ./postgres-data:/var/lib/postgresql/data
After reading kernel source I finally managed to make netlink sockets work for me. Below is an example of Netlink socket basics i.e opening a netlink socket, reading and writing to it and closing it. Kernel Module #include <linux/module.h> #include <net/sock.h> #include <linux/netlink.h> #include <linux/skbuff.h> #define NETLINK_USER 31 struct sock *nl_sk = NULL; static void … Read more
Alternatively, you can use one query with a lookup: var lookup = new Dictionary<int, Course>(); conn.Query<Course, Location, Course>(@” SELECT c.*, l.* FROM Course c INNER JOIN Location l ON c.LocationId = l.Id “, (c, l) => { Course course; if (!lookup.TryGetValue(c.Id, out course)) lookup.Add(c.Id, course = c); if (course.Locations == null) course.Locations = new List<Location>(); … Read more
Not all data is relational. For those situations, NoSQL can be helpful. With that said, NoSQL stands for “Not Only SQL”. It’s not intended to knock SQL or supplant it. SQL has several very big advantages: Strong mathematical basis. Declarative syntax. A well-known language in Structured Query Language (SQL). Those haven’t gone away. It’s a … Read more
not mysqldump, but mysql cli… mysql -e “select * from myTable” -u myuser -pxxxxxxxxx mydatabase you can redirect it out to a file if you want : mysql -e “select * from myTable” -u myuser -pxxxxxxxx mydatabase > mydumpfile.txt Update: Original post asked if he could dump from the database by query. What he asked … Read more
I like the conversion to an array, to be able to access individual elements: sentence=”this is a story” stringarray=($sentence) now you can access individual elements directly (it starts with 0): echo ${stringarray[0]} or convert back to string in order to loop: for i in “${stringarray[@]}” do : # do whatever on $i done Of course … Read more
Create a .bashrc file under ~/.bashrc and away you go. Similarly for ~/.gitconfig. ~ is usually your C:\Users\<your user name> folder. Typing echo ~ in the Git Bash terminal will tell you what that folder is. If you can’t create the file (e.g. running Windows), run the below command: copy > ~/.bashrc The window will … Read more