Elasticsearch Series - Aggregated Query

outline Aggregated queries from Elasticsearch have the same effect as aggregated queries from databases. We can learn from them by comparing them, such as summing, averaging, maximizing and minimizing. Basic concepts bucket Data grouping. Some data is bucketed by a field whose values are the same and placed in a bucket.It can be understood as t ...

Posted on Fri, 03 Apr 2020 19:34:33 -0400 by likwidmonster

Learn the operation brought by CoordinatorLayout+ViewPager+Fragment+Toolbar.

1. In the last article of coordinatorlayout, we also witnessed its strength: https://blog.csdn.net/m0_37667770/article/details/79888692 Let's take a look at the most common effect: at present, it's a popular design column: the picture is as follows: we can clear CoordinatorLayout by listening to the wrapped sliding controls, su ...

Posted on Fri, 03 Apr 2020 18:44:26 -0400 by LoneTraveler

Mybatis Reverse Engineering plus Maven plug in

1. Plug in introduction This plug-in is an enhanced version of Maven plug-in based on mybatis in idea, and supports the following operations: 1) Chinese notes of corresponding table fields of self defined import database 2) Suffix rename of Mapper and dao files 3) Implementation of paging class 4) Lombok integration can simplify the code 2. P ...

Posted on Fri, 03 Apr 2020 18:08:50 -0400 by woozy

MySQL communication protocol connection phase

[TOC] MySQL communication protocol (3) connection phase MySQL connection lifecycle graph TD A[start] --> |Connect|B(ConnectionState) B --> |Certification success|C(CommandState) C --> |Copy command|D(ReplicationMode) B --> |Copy command|D B --> |Error or disconnection|End C --> |Close connection|End D --> |Close connection| ...

Posted on Fri, 03 Apr 2020 17:29:04 -0400 by therainmaker53

Spring learning tour (2) create the spring framework java Web project quickly

Compiler: eclipse 1) Create Web project: Spring Web HelloWorld 2) Import the required jar package: 3) Create entity class: the same as the previous blog 4) Create the configuration file hellobean.xml. Same as the previous blog Note, however, that the location of the configuration file in this project is in the WebContent directory. 5) Instanti ...

Posted on Fri, 03 Apr 2020 15:51:34 -0400 by CrusaderSean

flink business use record

After deploying the flink cluster, my model is flink on yarn Create a new flink processing logic code module Make the module executable jar and put it into the whole project Perform the submit job operation on the flink client View the business details on the flink management page. Flink window functions After defining the window allocator, w ...

Posted on Fri, 03 Apr 2020 12:44:21 -0400 by RTT

Android audio usage problems

1, Turn off the Music audio, causing the System to turn off Audio stream track classification AudioManager.STREAM_MUSIC The system is related. When you turn off music, it will be turned off 2, Play audio crosstalk During the Call, A (using Call track) plays A section of audio B (using music track). Normally, if i ...

Posted on Fri, 03 Apr 2020 11:50:29 -0400 by achintha

Java Basic Grammar - Common Sorting Algorithms in Arrays

title: Java Basic Grammar(8)-Common sorting algorithms in arrays blog: CSDN data: Java Learning Routes and Videos 1. Basic concepts Sorting: is an important operation in computer program design. Its function is to rearrange a set or sequence of data elements into a sequence ordered by the value of a data item of a data element. Sort Code ...

Posted on Fri, 03 Apr 2020 10:47:46 -0400 by rune_sm

Simple Java logic small code (challenge arena, bubble sorting, narcissus number, palindrome number, recursion)

1. fight arena Simple little code, challenge arena. Remember the past and bless the new. 1 public static void main(String[] args){ 2 int[] ld = {1,4,2,10,8,9,5}; 3 int max = ld[0]; 4 for(int i = 1;i<ld.length;i++){ 5 if(ld[i]>max){ 6 max=ld[i]; 7 } 8 } 9 System.out.print(max); 10 } ...

Posted on Fri, 03 Apr 2020 10:30:05 -0400 by afterburner

017 parent combination of phone numbers

The mother combination of telephone numbers Given a numeric string, returns all possible combinations of letters represented by a number. The mapping of numbers to letters (as with phone numbers) is given below. Input: numeric string "23" Output: ["ad", "ae", "af", "bd&q ...

Posted on Fri, 03 Apr 2020 10:21:54 -0400 by AXiSS