One, C# design pattern: Interpreter Pattern
1, the application of interpreter pattern is the difficulty in the application of Interpreter pattern, only to meet the “frequent changes in busine
Month: October 2021
Modify a single XML attribute in C #
I have written the XML document very well, it will look like this
I I’m trying to find a way to access the “class” attribute of a single character and modify it. So far, I have reached the po
MySQL connection
MySQL connection Connect using mysql binary mode You can use MySQL binary mode to enter the mysql command prompt to connect to the MySQL database.
The following is a simple example of connec
C # expression tree explanation (1)
I. Preface I have always wanted to write an article about Dpper’s customized extension, but it will be designed to parse Lambda expressions, and to parse Lambda expressions, you must Know the relev
MySQLBINLOG restores misuse data
Overview Code bug, executed DELETE FROM t_resource WHERE resource_id =? OR parent_id =? Because of the OR condition, all the data uploaded by the user is cleared.
see if log-bin backup is e
Handling the best practices for processing a string in the VC?
Since I am new to Visual C, there are many types of strings that can be processed. When I use a certain type and continue to code, but in the next step, there are other types of built-in functions
C # serial port operation
1
SerialPort _Serial = new SerialPort
{
PortName = “COM1”,
BaudRate = 9600,
DataBits = 8,
Parity = Parity.None,
StopBits = StopBits.One,
WriteTimeout = SerialPort.InfiniteTimeout,
Rea
MySQL – SQL JOIN table, 1 of which has a comma
When I search for “new1”, how to get all usernames. For example: I should get A and B as user IDs 1,2 in tblC is 1,2 and there is new for row1 1. What query should I use to get the above result?
I
Mysql build environment
Forget the root password;
①Close the service:
sudo service mysql stop;
②Safe mode + authentication-free startup service
sudo /usr/local/mysql/ bin/mysqld_safe –skip-grant-tables
MySQL advanced query
1. The grouping field is merged from multiple lines into one line.
mysql> select user_id,tag_id from yyfax_user.user_tag where user_id=‘U000412280’;
+————+———-+
| user_id | ta