Programmer Think

Development tool: MyEclipse 2013, database: MySql 1. First, create a database in the database. The database tool I use is sqllog Create the following database: Open MyEclispe after database creation 2. Create Web Project 2.1: Item 1: Guide Package The following packages need to be imported:(these bags can be found on ...

Talk about it casually In fact, GCD has been contacted by all of us, and we are not explaining what GCD is. Why do we suddenly want to talk about the semaphore problem? In recent interviews, when I asked the interviewers how to deal with a series of operations after multiple requests are completed, some said to create a temporary variable to do ...

◆ 1. Download the windows version of openresty: http://openresty.org/cn/download.html ◆ 2. Unzip to the directory to be installed (for example: unzip to the root directory of disk D): D:\openresty-1.13.6.1-win32>dir Driver D The volume in does not have a label. The serial number of the volume is A25B-3CEA D:\openres ...

Parallel replication records updated from the library do not exist, but exist background The semi synchronous slave database SQL thread with parallel replication enabled reports 1032 errors, while the asynchronous slave database does not report any errors. This happens occasionally Analysis Version mysql 5.7.16 mysql> show variables like '%s ...

1. [Role]To maintain the sustainability and stability of the connection, the websocket heartbeat is the solution.2. [Analysis]1. If the device network is disconnected, the native websocket will not immediately trigger any events on the websocket, and the front end will not know if the current connection has been disconnected.2. When we use the ...

Consistent read Consistent read refers to that InnoDB uses multiple versions to query the snapshot of the database at a certain point in time. This query can see the changes made by the transactions submitted before this time point and will not be affected by the later changes or uncommitted transactions. However, this rule do ...

requirement analysis Before sharing the source code, the requirements of the permission module in the b2b2c system should be sorted out and clarified to facilitate the understanding of the source code. Business needs There are three roles of authority in b2b2c e-commerce system: buyer, seller and platform administrator. In the seller's rol ...

Preface 2020, still need to learn JSP? I believe that the students who are still in university will have this question. In fact, when I was 18 years old, I had already seen a similar question: "should JSP still learn?". In the past 18 years, I have published several JSP articles, and many developers have commented on "isn't t ...

1. Configure the timeout time of session in web.xml <! -- configure session timeout in minutes -- > <session-config> <session-timeout>180</session-timeout> </session-config> 2. I also post a session tool class here to facilitate obtaining the user information in the session after the successful login. ...

Some time ago, fengjunhao's "parasites" won many awards at the Oscars. I also like watching movies. After watching the movie, I was curious about other people's opinions on the movie. So I used R to climb some Douban movie reviews, and jieba got the word cloud to understand. But if I didn't ...