Tag：empty
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Time：2020-11-19
1. Use the Del command to delete the elements at the specified position in the list >>> s=[1,2,3,4] >>> del s[1] >>> s [1, 3, 4] 2. Use the pop() method of the list to delete and return the elements at the specified (the default is the last) position. If the given index exceeds the […]
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Time：2020-11-9
preface We are hereImplementation of fixed size cache from zero handwriting cache framework (1)We have implemented our cache in. In this section, let’s learn how to implement the expiration function similar to that in redis. Expiration is a very useful feature. For example, I want the login information to be put into redis, and it […]
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Time：2020-11-8
introduction Deeplab V3 + is the latest version of deeplab for semantic segmentation, which adds a decoder structure similar to u-net idea and adjusts xception in encoder. The article was published by the Google team byLiang-Chieh Chen, Yukun Zhu, George Papandreou, Florian Schroffff, and Hartwig Adam Original paper Network architecture The overall architecture of the […]
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Time：2020-10-25
–The main table before this launch, MD_ poc_ I didn’t put in other fields of survey, which has nothing to do with the bug I’m going to talk about this time. DROP TABLE IF EXISTS md_poc_survey; CREATE TABLE `md_poc_survey` ( `member_ survey_ id` int(10) NOT NULL AUTO_ Add comment ‘member questionnaire self increment ID’ PRIMARY […]
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Time：2020-10-23
preface Java implements redis from zero handwriting? Java realizes redis from zero handwriting How to restart memory data without losing it? Java realizes redis from zero handwriting Another way to realize the expiration policy of redis (5) from zero handwriting in Java Java realizes redis from zero handwriting Java handwritten redis from scratch (7) detailed […]
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Time：2020-10-14
preface Why should I write a personal cloud note?(⊙o⊙)… Amount, amount, amount… The story has to start with a batAll right_ (:з」∠)_ I don’t want to talk about it There are several reasons for this: Suddenly I found that Youdao cloud notes are not my own. My privacy is in other people’s library. And I […]
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Time：2020-10-13
Spring cache abstraction Spring has defined a series of abstract interfaces since 3.1 to unify different caching technologies, and supports the use of jcache (jsr-107) annotations to simplify our cache development. Spring cache is only responsible for maintaining the abstract layer, and the specific implementation depends on your technology selection. Decouple cache processing and caching […]
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Time：2020-10-4
Problem introduction The most common data type used by PHP is array. But do you know how it works? PHP array, similar to the index array we learned in C language, is also similar to the data structure hash table / dictionary we learned. What data structure is its underlying implementation based on? Before we […]
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Time：2020-9-18
Abstract:This paper attempts to describe the principle of Mongo replication and distributed transactions, and demonstrate the correctness of the implementation where necessary, hoping to provide some reference for mongodb kernel enthusiasts. 1. Preface Mongodb reconstructs the ability of readhistory (readmajor) based on the function of generalization Si provided by wiredtiger Based on the allcommittedtimestamp API […]
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Time：2020-9-10
Please indicate the source of the article: module: command not found moduleIt is the command to load / manage modules on the * Nix system. However, most distributions are not installed by default. Running this command will cause the following errors:module: command not found。 The solution is to userootThe installation command of CentOS is as […]
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Time：2020-9-3
Mybatis understanding and mastering (CACHE) @(mybatis) [Java, framework, mybatis] First level cache (sqlsession) You can use it by default Framework processing cache isRely on SQL mapping IDThe internal cache of mybatis uses a HashMap, and the key is hashcode + statementid + SQL statement. Value is the Java object mapped to the query result set. […]
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Time：2020-8-22
1. Introduction to redis Redis is the most widely used memory data storage in the industry. Compared with memcached, redis supports richer data structures, such as hashes, lists, sets, etc., and supports data persistence. In addition, redis also provides some database like features, such as transaction, ha, master-slave database. It can be said that redis […]
