Did you tread a hole?
1. Problem Description 2. Problem Exploration 3. Summary 4. Extended Reading
1. Description of the problem
A few days ago, the QQ group was discussing a delayed update of M ...
Posted on Sun, 07 Jun 2020 18:11:50 -0700 by TeamTJ
We can use haproxy + preserved with two Mycat to build a Mycat cluster to achieve high availability. HAProxy
It realizes the cluster high availability and load balancing of MyCat,
The high availability of HAProxy itself can be achieved through Keepalived.
Posted on Sun, 07 Jun 2020 03:12:10 -0700 by Clarkeez
Tree structure is not new to everyone, but there are several trees that are really applied to the code - binary sorting tree, balanced binary tree, B tree, B + tree, red and black tree. Whether you know it or not, today, after reading this blog, you will plant it in front of your home.
Posted on Sun, 07 Jun 2020 01:31:13 -0700 by srikanthiv
User order indicator business development
3.1 demand analysis
E-commerce platforms often need to analyze users' behaviors according to their purchase data. We make some statistical analysis based on the user's order situation for future user behavior analysis. According to the consumer behavior of users ...
Posted on Fri, 05 Jun 2020 01:04:27 -0700 by bakaneko
1, Demand analysis
1. Get the taskid from the spark submit script submitted by the user and get the parameters of the task
2. Obtain the data within the specified date range for calculation, and obtain the page slice flow to calculate the conversion ratio of visits between pages.
Like targe tPageFlow: ...
Posted on Fri, 05 Jun 2020 00:03:52 -0700 by defunct
1, What is reverse engineering?
2, Characteristics of MyBatis reverse engineering
1. Advantages of MyBatis reverse engineering
2. Disadvantages of MyBatis reverse engineering
3, MyBatis reverse engineering construction
1. Add dependency pom.xml
2. Create MBG profile generatorConfig.xml
Posted on Thu, 04 Jun 2020 06:45:24 -0700 by millsy007
1. Environment configuration
Install JAVA 1.8 / MySQL 5.7 / ZooKeeper 3.5.8
1.1 installing JAVA 1.8
Check whether there is an installation. If there is one, delete it first
rpm -qa | grep java # java-1.7.0-openjdk-188.8.131.52-184.108.40.206.el7_0.x86_64
rpm -e --nodeps java-1.7.0-openjdk-220.127.116.11-18.104.22.168.e ...
Posted on Tue, 02 Jun 2020 19:45:11 -0700 by dsjoes
1. What is a view
In short, a view is a virtual table, a mapping of entity tables
When to use views
In development, there are some table structures that do not want too many people to contact, so entity tables are mapped to a view. (simplified table structure)
In the process of project, programmers main ...
Posted on Tue, 02 Jun 2020 07:40:40 -0700 by thomasanup
Single line function -- PL/SQL
(1) Character function
Concatenate two strings, same as |
Change the first letter of the string to uppercase
Find the position of a string
Give the length of the string in characters
Posted on Sun, 31 May 2020 08:55:23 -0700 by rushenas
Indicates that the execution step returns at most one row of data. const usually appears in the equivalent query of the primary key or unique index, such as the equivalent query of the primary key id of the t table:It can be considered that it is as fast as a rocket to locate a record by comparing the equivalence between the primary key ...
Posted on Sun, 31 May 2020 08:54:20 -0700 by a.heresey