Tag：case
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Time：2020-2-15
org.springframework.data.mongodb.InvalidMongoDbApiUsageException: Due to limitations of the com.mongodb.BasicDBObject, you can’t add a second ‘createTime’ criteria.When spring’s mongotemplate query has two restrictions on the same field, improper use will result in an error.Error case query.addCriteria(Criteria.where(“createTime”).gt(startDate())); query.addCriteria(Criteria.where(“createTime”).gt(endDate())); Correct use cases Criteria criteria = new Criteria(); criteria.andOperator(Criteria.where(“createTime”).gt(startDate()), Criteria.where(“createTime”).lt(endDate())); query.addCriteria(criteria);
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Time：2020-2-5
In order to write a robust program, there must be a test, which can ensure that the online code functions meet the expectations and prevent unnecessary losses after online. For APIs that we’ve written in one go, rushing to go online often leads to bad results. So how do we write tests to make sure […]
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Time：2020-1-31
This article is reprinted and the copyright belongs to the author. For commercial reprint, please contact the author for authorization. For non-commercial reprint, please indicate the source. Author: Song Baohua Source: WeChat public number Linux yard (id: linuxdev) principle Watch a small video first. What happens if the kernel access user doesn’t do access? https://v.qq.com/x/page/i1342… […]
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Time：2020-1-27
On January 7, Alibaba cloud official website officially launched “cloud habitat” (https://yqh.aliyun.com/), which aims to provide you with first-hand cloud information, a quick introduction to cloud products, selected Enterprise Cloud cases from different industries, and the best practice based on many successful cases, to help you make cloud decision, and a more relaxed cloud access […]
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Time：2020-1-22
Let’s talk about the preface. It took more than half a month to read over and over again, intermittently, Judea Pearl’sThe Book of WHY, I feel that it is easier to understand the relatively abstract content of the first three chapters by reading the case in Chapter 4 first. The urgent need for attribution in […]
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Time：2020-1-22
Ruby’s case expressions have two forms: The first form is close to a set of sequential if statements: it lets you list a set of conditions and execute the statement corresponding to the first true condition expression. The second form specifies a target at the top of the case statement, and each when clause lists […]
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Time：2020-1-19
Content of this book As can be seen from the title of the book, the book talks about two things of architecture, one is the principle and the other is the case. The case part is not reflected in the map, but it is suggested that the reader should take a look at the […]
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Time：2020-1-18
V-IF realizes component self destruction I’ve talked about how I can think about it. If I’m in a hurry, I can see it directlyLast ~ ~ ~ Notification prompt component case study In writing some simple notification component cases, you may write as follows //In the install method of [index. JS] setTimeOut(()=>{ document.body.removeChild([DOM]) , timer} […]
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Time：2020-1-16
Preface Previously learned data types can only store one value (for example: number / string). I want to store multiple values in a variable. How should I store them? The so-called array is to arrange multiple elements (usually of the same type) in a certain order into a collection, which we call array. 1.1 array […]
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Time：2020-1-7
1、 MapReduce overview Hadoop MapReduce is a distributed computing framework for writing batch applications. Written programs can be submitted to Hadoop cluster for parallel processing of large-scale data sets. The MapReduce job splits the input data set into independent blocks, which are composed ofmapIn a parallel way, the frameworkmapThe output of is sorted and then […]
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Time：2020-1-6
The last time (talking about the login state verification of data interface and JWT), it was said that the data interface of app and applet generally uses token to verify the login information, because cookies are not used. But what should I do if I have to use cookies for some reason? case Let’s talk […]
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Time：2019-12-21
Skillful use of navigation bar is very important for website layout. With CSS, JS, JQ, you can convert it into a good-looking navigation bar instead of a boring HTML menu. CSS implementation: CSS implementation dropdown <span style=”background-color: #f5f5f5; color: #800000;”> *</span><span style=”background-color: #f5f5f5; color: #000000;”>{</span><span style=”background-color: #f5f5f5; color: #ff0000;”> margin</span><span style=”background-color: #f5f5f5; color: #000000;”>:</span><span style=”background-color: […]
