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How to execute a MySQL command from a shell script?
...h shell scripting and SQL. If you need to use them in SQL for specifying a table or database name you'll need to escape them in the shell script like so:
mysql -p=password -u "root" -Bse "CREATE DATABASE \`${1}_database\`;
CREATE USER '$1'@'%' IDENTIFIED BY '$2';
GRANT ALL PRIVILEGES ON `${1}_datab...
What is JSON and why would I use it?
...languages, this is realized as an object, record, struct, dictionary, hash table, keyed list, or associative array.
An ordered list of values. In most languages, this is realized as an array, vector, list, or sequence.
JSON Structure
Here is an example of JSON data:
{
"firstName":...
parseInt(null, 24) === 23… wait, what?
...o find out what the toString representation of null is. We need to look at Table 13 — ToString Conversions in section 9.8.0 for that information:
Great, so now we know that doing toString(null) internally yields a 'null' string. Great, but how exactly does it handle digits (characters) that are...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
....168.1.136:27017 would veto with 'I don't think 192.168.1.138:27017 is electable'
Sun Dec 29 20:26:31.059 [rsHealthPoll] replset info 192.168.1.137:27017 thinks that we are down
Sun Dec 29 20:26:31.059 [rsHealthPoll] replSet member 192.168.1.137:27017 is now in state STARTUP2
Sun Dec 29 20:26:31....
What's your most controversial programming opinion?
...ng memory leaks in C / C++ cannot fully appreciate what Java brings to the table.
Also the natural progression should be from "how can I do this" to "how can I find the library which does that" and not the other way round.
...
Stop Excel from automatically converting certain text values to dates
...l.
If there's a reason you don't want to use the tab, look in an Unicode table for something else suitable.
Another option
might be to generate XML files, for which a certain format also is accepted for import by newer MS Excel versions, and which allows a lot more options similar to .XLS format...
Direct vs. Delegated - jQuery .on()
... if attaching many event handlers (for example, each row of a table), it is often better performance wise to use single delegated handler to container instead of attaching many direct handlers. You can see this from the basic fact that event handler count is by itself a profiling metric...
Why use 'virtual' for class properties in Entity Framework model definitions?
... nullable Foreign Key in SQL. You do not HAVE to eagerly join every keyed table when performing a query, but when you need the information -- it becomes demand-driven.
I also mentioned nullable because many navigation properties are not relevant at first. i.e. In a customer / Orders scenario, y...
Get records with max value for each group of grouped SQL results
...'s a super-simple way to do this in mysql:
select *
from (select * from mytable order by `Group`, age desc, Person) x
group by `Group`
This works because in mysql you're allowed to not aggregate non-group-by columns, in which case mysql just returns the first row. The solution is to first order th...
What is the purpose of the EBP frame pointer register?
...er can figure out where local variables and arguments are using the symbol table since they are guaranteed to be at a constant offset to EBP. Otherwise there isn't an easy way to figure where a local variable is at any point in code.
As Greg mentioned, it also helps stack unwinding for a debugger s...