1.1. in song stylemybatis-config.xmlAdd the following
<!– Add alias –> to the type;
<typeAliases>
<typeAlias type=”fafa.bean.User” alias=”User”/>
</typeAliases>
2.” and thenUserMapper.xmlChange all of them into
parameterType=”User”
resultType=”User”
Two.1. created a songdb.properties
Replace the following:
<!– Database connection pool –>
<dataSource type=“POOLED”>
<property name=“driver” value=“${driver}“ />
<property ...
Euclidean algorithm: GCD (a, b) = GCD (B, R), where r = a mod B
How to understand this algorithm is correct.
Set D1For any common divisor of a and B, that is d1|a，d1|b ，Because r = a mod B, D can be obtained.1|r
Therefore, any common divisor of a and B is also the common divisor of B and R, that is, the common divisor sets of them are the same.
So GCD (a, b) = GCD (B, a%b).
These days, when installing a software to set the environment variables, the / etc / profile file was inadvertently broken (that is, it was not configured correctly), causing all commands to be unavailable after source / etc / profile. The following are reported:
-bash: xxx: command not found
My first thought was to go into recovery mode and get rid of what I had just modified, and then I thought it would be a hassle or no, and I thought I was in a state where the virtual machine could be restored to the snapshot I had backed up before, but I was unwilling to deploy myself for a few minutes a...
1、Can a.Java source file include multiple classes (not internal classes)? What are the restrictions?
There can be multiple classes, but only one public class, and the public class name must be consistent with the file name.
2、JavaDo you have goto?
javaThe reserved word is not used in Java now.
3、Let’s talk about the difference between & and & &.
&And & amp; & amp; can be used as logic and operators, representing logic and (and), when the result of the expression on both sides of the operator is true, the entire operation re...
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>title</title>
<style>
.map {
width: 800px;
height: 600px;
background-color: #CCC;
position: relative;
}
</style>
</head>
<body>
<div class="map"></div>
<script src="common.js"></script>
<script>
//Generating random number objects
(function (window) {
function Random() {
}
Random.prototype.getRandom = function (min, max) {
...
Question:
The HTML content of the template is converted to jQuery times’s following error:
Syntax error, unrecognized expression:
Operation code:
var linkUl = $(“#linkUl”), listHeight;$(this.linkTemplate).appendTo(linkUl);
The modified operation code:
var linkUl = $(“#linkUl”), listHeight;$($.parseHTML(this.linkTemplate, document, true)).appendTo(linkUl);
Reason: jQuery 1.9 * starts with parseHTML, the HTML content in script, which must be converted to use for security. Otherwise, it will not be able to resolve the error of HTML content.
Usage:
$($.parseHTML(...
Preface
Using Python undoubtedly reduces many rule constraints and development costs, allowing us to focus more on logic than syntax. But gains and losses, development efficiency improved, but has brought operational performance problems, so it is often pursued by other schools of thunder.
As a pythoner, we are also very sad, blame us.
Fortunately, God closed one of our doors, but he opened another window for us, because the bottom layer was written in C, so we could rewrite some of the more performance-hungry features, or modules, in C, and then import XXXXXX seamlessly.Combination.
Even if ...
The fifth chapter tellsHash table，It is implemented as a dictionary in Python and consists of hash functions and arrays. It has the advantages of both arrays and linked lists, avoiding duplication, and can simulate mapping relations.
hash table implementation
Hash function + array to achieve the hash table
conflict
Different inputs are mapped to the same output, which is conflict. How to handle conflicts? Create a linked list on the same output.
fill factor”
The hash table contains the number of elements / positions, and the fill factor measures how many positions in the hash ta...
