As we all know, regular expressions implemented in a recursive manner (rather than NFA/DFA) may require exponential running time in some cases. Lua patterns are implemented through recursive matche
Month: October 2021
Restart the system via Lua script
I need to restart the system through a Lua script.
I need to write some strings before restarting, and I need to write a string in Lua
The script after restarting is complete .
Example:
<
Mysql log binlog introduction
???? MySql will generate some logs during the running process, and now for the consistency of the master-slave data synchronization problem, as well as database recovery, database optimization, dat
C # in a row of code to implement 18-digit digital timestamps to DateTime
Original text: A line of code in C# realizes the conversion of 18-digit digital timestamp to DateTime
The time stamp data accessed is:
636728674347302002
How to convert it to Date
C # format Easyui Tree
public ActionResult Index(
{
CRMEntities db = new CRMEntities();
EasyUIJsonTree root = new EasyUIJsonTree()
Menu
Menu
“Root” menu Trees> list = db.Trees.ToList();
if (list != null && list.C
What is the fastest way to find a big table in radius mysql (latitude longitude)
Currently I have several tables with 100k rows. I am trying to find the following data.
SELECT
* , SQRT(POW(69.1 * (latitude-‘49.1044302’), 2) + POW(69.1 * (‘-122.801094’-longitude) * COS(lat
Mysql – How to choose a row with the current date time?
I tried to select only today’s records from the database table.
Currently I use
SELECT * FROM `table` WHERE (`timestamp`> DATE_SUB(now(), INTERVAL 1 DAY)); But it needs the results of t
C # list method stored in the problem
I encountered a bug that has not been resolved by scratching the earplug for a long time. It is necessary to record it.
Now I use a multi-dimensional list.
IListint>> list = new Listint
MySQL character set
1. Character set and verification rules Character set is a set of symbols and codes, and collation is a set of rules for comparing characters in a character set. That is, the collation of the chara
MySQL case: calculation ring ratio
select a.day_num as “Serial Number”,
a.create_time as “Shelf time”,
a.clue_num as “The amount of vehicles on the shelves”,
((a.clue_num/b.clue_num)-1) as “Chain Ratio”
from
(
select cast(