tomcat How to view Tomcat version and number
CreationTime–2018August 31st, 10:16
Author:Marydon
1.tomcatExhibition
2.Specific operation
Implementation: run the version.bat file of Tomcat under the CMD command.
Step one: open the CMD window.
win+r–>cmd–>Enter
The second step: return to the root directory of C disk.
Input command: CD \ –> carriage return.
The third step: switch to the disk (tomca disk).
Input command: d: –> carriage return.
The fourth step: switch to OmcA’s bin directory.
Input command: CD apac...
ARDUINO UNOThe digital pin port is unstable after power on.
in use4*4When the matrix keyboard is encountered, the input level can not be stable and has been recognized as high level.
After discovering this problem, first check whether the program is wrong. After checking, there was no problem with the program.
So check the voltage value of the port during the period, this is a more intuitive method, you can clearly know the level of the output port. The result is that the voltage figure is only a few points below zero when the button is not pressed, which obviously belongs to low level. When ...
select * *Representing all
Query multiple fields
select Field 1, field 2, field 3
Polymerization function count(*)
Statistics
select count(*)
sum()
Summing up
select sum() Or select sum (CJ)
avg()
average value
select avg() Or select AVG (CJ)
max()
Maximum value
select max() Or select max (CJ)
min()
minimum value
select min() Or select min (CJ), min (CJ).
Examples:
#For the 001 students, the highest score, the lowest score, the total sc...
1. Equivalent connection
Principle: form a large logical table with multiple single tables.
Grammar:
select * from Table A, table B where table A. primary key = table B. foreign key and query condition
select * from Table A, table B where Table A. primary key = table B. foreign key and C. primary key =B. foreign key and query condition
Two. Internal connection
First judge, then connect.
The result of internal connection is the same as the result of equivalent connection.
Syntax: two tables
select *
from Table A inner join table B
on Table A. primary key = table B. primary key
whe...
queue The main principle is first in first out (excepted).
The difference between basic methods
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Add data:
add Add a metarope and throw an IIIega ISlabEeplian exception if the queue is full
put Add an element if the queue is full, then block.
offer Add an element and return to true. If the queue is full, then return to false.
Remove data:
remove Remove and return the element at the head of the queue if the queue is empty, throw ...
Media query
What is media query?
Media queries allow us to set CSS styles for device displays based on their features (such as viewport width, screen scale, device orientation: horizontal or vertical). Media queries consist of media types and one or more conditional expressions that detect media characteristics. Media features that can be used in media queries are wIdth, height and color (etc.). Using media queries, you can customize the display effect for certain output devices without changing the content of the page.
1、Media query operation mode
The actual operation is: ask the device (c...
Towards end-to-end reinforcement learning of dialogue agents for information access
KB-InfoBot
In the multi-round dialogue model interacting with the knowledge base, the symbolic query statement is abandoned and the soft posterior distribution is used in the knowledge base to find the most probable information.
du -ah –max-depth=1 This is the result I want a to show all the files and folders in the directory (excluding subdirectories), h to be human-readable, and MAX-depth to be directory depth.
duThe command is used to see the size of disk space occupied by a directory or file. Common options are: Du -sh
Functions of du: `du` reports the amount of disk space used by the specified files and for each subdirectory(of directory arguments). with no arguments, `du` reports the disk space for the current directory.
Obviously, unlike DF, it is used to see the size of disk s...