is the gap or next-key lock added only if the current read is performed? Or do you want to take a snapshot and add it? how to avoid phantom reading if snapshot reading is not added? ...
Xiaobai asks for advice. My following code sent the stuname to the front end, and the front end also received it, but the back jumped to the page mainnav, so how does this stuname pass to mainnav? app.post( login stulogin ,function(req, res){ ...
I ran lock table employees write, on one transaction and then used select statements on another transaction, without for update or lock in share mode select is said to be snapshot read, unlocked, why it is lock table. Write watch lock blocking? ...
if you currently need to generate a table each month to store the current month s data, the following table will be generated: tablename_201709 tablename_201710 tablename_201711 tablename_201712 tablename_201801 tablename_201802 tablename_201803 table...
for example, ask for documents that can be run by combining springboot2 with mysql and mongodb at the same time ...
just started to use the laravel framework development, or rookies ~ a lot of do not quite understand, at present to do a function, customized a form verification class file ~ ~ for example, I am now a member module, my member controller can have many way...
browser error: SQLSTATE [HY000] [1045] Access denied for user root @ localhost (using password: NO) I successfully connected to the database with navicat, the user name is root, password is the password set when installing mysql, and the framework...
I would like to ask you how to solve this, the interview questions of the other day phenomenon : connecting (connection) is also an important aspect that affects the performance of MySQL. The connection between the MySQL client and the MySQL server i...
Mysql multiple count query results returned an error, ask for help, thank you Table structure Table user (user table) is abbreviated. Table activity (activity table) is brief. Table my_calendar_subscribe (user follow activity) id (self-added...
Mysql create stored procedure: create procedure s_add(in a int, in b int, out sum int) begin set sum = a + b; end After , this is the Java code package ch04.servlet; import java.io.IOException; import java.io.PrintWriter; import java.sql.Ca...
I know that using git s subtree can reference another project B as a subdirectory in one project A, but will reference the entire project B, and I only want to reference some of the code in B. the application scenario is that among several web system...
1 br Nodejs inserts data into the data 2mysqlutf8mb43, the front end uses react+redux, 4. I guess the problem lies in the character encoding here ....
for example: I have a table T1 in which there is a comment named name name field select name from T1 that gets array (). [0]=array( name => 123 ), [1]=array( name => 236 ) ) how to change the above name to name ...
how do I get the data for the first 30 days, every two days? ...
as shown in the picture, the official MySQL website says that MySQL Cluster can automatically slice the table to different data nodes, which means that there is no need for manual table splitting. We often divide the database into tables, such as 100 us...
use the following command to view binlog: show binlog events in mysql-bin.000039 what you see is as follows: I can directly display the executed binlog statements when I look at the contents of other people s sql logs on the Internet. Why d...
as shown below, I use jdbc to create a MySQL trigger, which is successfully created in navicat. After the sql2 is output, it runs successfully in navicat. However, when the program runs, it will prompt that there is a syntax error in the statement that ...
add data to the database in positive order, can you add it in reverse order (not select * from table name by ID desc) is the data in the data table displayed in reverse order ...
firewall, the integrated environment of system Centos7, lnmp.org, does not have the permission to run mysql. Iptables has been restarted. Refresh authorization error: Mysql user:Iptables: New processing: 1. Modify mysql configuration file vi ...
the code is as follows $num = M ( log )-> where ( "date_format (create_time, %Y-%m ) = $date ")-> count ( id ); for($i = 0; ($i+5000)<=20000;$i += 5000){ $datas = M( credit_log )->where("date_format(create_time, %...
quote the filter that comes with vue to report an error, such as currency error report: Failed to resolve filter: currency related codes < style rel= "stylesheet scss " lang= "css " > < style > < template > <div> <header><...
if you add public $uid=Cookie::get ( uid ) to the validation class like this, you will report an error. Why do you report an error? Can t you use cookie like this? <?php namespace app index validate; use think Validate; use think facade C...
mergePromise data const timeout = ms => new Promise((resolve, reject) => { setTimeout(() => { resolve(); }, ms); }); const ajax1 = () => timeout(2000).then(() => { console.log( 1 ); return 1; }); const ajax...
when trying to query using css3 media, it is found that both max-width and min-width have uncertainty when expressing a range depending on a given value. refer to W3C official document , there is a paragraph: Most media features accept optional m...
http: nodejs.cn api buffer.h. for example, there is a text saying "it s a beautiful day today " const R1 = content.toString ( hex ) how to convert R1 back to Chinese? Setting utf8 for R1 toString seems to have no effect ...