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Month: October 2021

How to get HEXDUMP for structural data

….
finalize(char *hdrs, sendip_data *headers[], int index,
sendip_data *data, sendip_data *pack)< br /> {
…….. For debugging purposes, I want a hexadecimal dump of the data and packet stru

October 4, 2021By Simo C & C++ data, HEXDUMP, how to get, structureLeave a Comment

[C #] FTP Series (5) – Delete data specified on the FTP

[C#] FTP series (5) ─ Delete the data box with the specified name on FTP

Continue the previous article [C#] FTP series (4) ─ Change the file on FTP File name article, this time I’m going to s

October 4, 2021By Simo C# C #, data, delete, FTP, Name, series, specifiedLeave a Comment

MySQL Workbench! Add a prefix for all tables

Is it possible to set the table prefix in the MySQL workbench?
For example: I created a complete pattern (table_1, table_2, table_3,… table_N), and I want Workbench to add a prefix to each table

October 4, 2021By Simo Mysql Add, for the form, mysql, prefix, WorkbenchLeave a Comment

Mysql – How to choose a line in the case of considering weight?

I have a table that looks like this:

id: primary key
content: varchar< br />weight: int What I want to do is to randomly select a row from the table, but consider the weight. For example, if

October 4, 2021By Simo Mysql choose, consider, How, in the case, mysql, one line, random, WeightLeave a Comment

MySQL account management

< /p> #code
desc user
select user,host,authentication_string from mysql.user;

#Modify password
update user set authentication_string=password(‘new password’) where user=‘user name’

#After

October 4, 2021By Simo Mysql account, management, mysqlLeave a Comment

Talking about Mysql Multi-Table Operation

Field operation create table tf1( id int primary key auto_increment, x int, y int);# Modify alter table tf1 modify x char(4) default”;alter table tf1 change ym char(4) default”;# Add mysql>: alte

October 4, 2021By Simo MysqlLeave a Comment

C # gets CPU and memory usage

Original: C#Get CPU and memory usage rate

Method 1:

using System;
using System.Runtime.InteropServices;

namespace ConsoleApp1
{
public class Class1
{
static void Main(string[

October 4, 2021By Simo C# C #, CPU, Get, memory, rate, usageLeave a Comment

View Isolation level of MySQL transaction

1. Select the database to view the current transaction isolation sector

select @@tx_isolation;

2. Open the transaction, roll back the transaction

3. Dirty read, phantom read in th

October 4, 2021By Simo Mysql isolation, Level, mysql, transaction, viewLeave a Comment

MySQL Optimization: How to avoid back inquiry

Reference: https://www.cnblogs.com/myseries/p/11265849.html

InnoDB has two types of indexes: clustered index (clustered index) index) and ordinary index (secondary index)

The leaf node

October 4, 2021By Simo Mysql back, how to avoid, mysql, Optimization, query, tableLeave a Comment

How do I tell the parent thread that is done using PTHREADS in C?

I have a TCP server application that uses POSIX threads and C to serve each client in the new thread.

The server is in its set Call “listen” on the socket. When the client connects, it will g

October 4, 2021By Simo C & C++ China, completion, how to tell, parents, pthreads, threads, useLeave a Comment

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