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the file specified在家工作,程序在家里的电脑运行时,出现一个异常,还是第一见到:Server Error in '/' Application.The system cannot find the file specified Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ComponentModel.Win32Exception: The system cannot find the file specifiedSource Error: An unhandled exception was generate
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the file specifiedServer Error in '/' Application.The system cannot find the file specifiedDescription: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.ComponentModel.Win32Exception: The system cannot find the file specified Insus.NET开发时,数据库是使用企业版,因此连接字符串就是写成默认的实现,而现在部署的数据库是\SQLEXPRESS。所以我们修改一下连接字符串:直
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运行PHP出现No input file specified错误办法运行PHP出现No input file specified错误的解决办法 今天配置了一台新服务器,使用的是IIS + Fastcgi + PHP 5.3.X,在默认网站下运行都是正常的,但是新增一台虚拟主机或网站访问php页面的时候就会报错“No input file specified”。按照网上的各种解决方法,如屏蔽doc_root、给目录加权限、修改缓冲池等等都无效。后来发现一个解决的文档,找着试了确实管用,方法如下:打开php.ini文件,这个你看你怎么配置的了。在php.ini文件里面修改:1、增加一行(这个最重要)fastcgi.impersonate = 12、修改两项(解开注释就可以了)cgi.fix_pathinfo=1 cgi.force_redirect = 0
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if no direction is specified, key_or_list must be an instance of list使用pymongo对某一字段进行sort时,报错 TypeError: if no direction is specified, key_or_list must be an instance of list 问题代码:在mongo中执行没有问题count=db.three_province_poi_v9.find({ "sum_n.sum_4_x":{ $gt:0} } ).sort({"sum_n.sum_4_x":1}). count()更正后:在python中执行count=db_first.three_province_poi_v9.find({"sum_n.sum_4_x":{ "$gt":0} } ).sort([("sum_n.sum_4_x",1)]).count()附:相关代码from pymongo import MongoClientdef get_COUNT(): Client=MongoClient('192.168.1.XXX',27017)
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- 2.4 逆变 -<code>Comparable<in T></code> 的源码分析 在 Kotlin 中其实最简单的泛型逆变的例子就是 Comparable<in T>:public interface Comparable<in T> {//泛型逆变使用in关键字修饰 /** * Compares this object with the specified object for order. Returns zero if this object is equal * to the specified [other] object, a negative number if it's less than [other], or a positive number * if it's greater than [other]. */ public operator fun compareTo(other: T): Int//因为是逆变的,所以T在函数内部出现的位置作为compareTo函数的形参类型,可以看出它是属于消费泛型参数的}
- 5.1 <code>Array</code> 数组 在 Kotlin 中数组使用Array这个类来辨识,它定义了 get 与 set 函数(按照运算符重载约定这会转变为 [])以及 size 属性,以及一些其他有用的成员函数:public class Array<T> { /** * Creates a new array with the specified [size], where each element is calculated by calling the specified * [init] function. * * The function [init] is called for each array element sequentially starting from the first one. * It should return the value for an array element given its index. */ public inline constructor(size: Int, init: (Int) -> T) /** * Returns the array element at the specified [index]. This method can be called using the * index operator. * ``` * value = arr[index] * ``` * * If the [index] is out of bounds of this array, throws an [IndexOutOfBoundsException] except in Kotlin/JS * where the behavior is unspecified. */ public operator fun get(index: Int): T /** * Sets the array element at the specified [index] to the specified [value]. This method can * be called using the index operator. * ``` * arr[index] = value * ``` * * If the [index] is out of bounds of this array, throws an [IndexOutOfBoundsException] except in Kotlin/JS * where the behavior is unspecified. */ public operator fun set(index: Int, value: T): Unit /** * Returns the number of elements in the array. */ public val size: Int /** * Creates an iterator for iterating over the elements of the array. */ public operator fun iterator(): Iterator<T>}我们可以使用库函数 arrayOf() 来创建一个数组并传递元素值给它,这样 arrayOf(1, 2, 3) 创建了 array [1, 2, 3]。 或者,库函数 arrayOfNulls() 可以用于创建一个指定大小的、所有元素都为空的数组。另一个选项是用接受数组大小以及一个函数参数的 Array 构造函数,用作参数的函数能够返回给定索引的每个元素初始值://创建一个 Array<String> 初始化为 ["0", "1", "4", "9", "16", "25", "36", "49", "64", "81"]val asc = Array(10) { i -> (i * i).toString() }asc.forEach { println(it) }
- 2.1 通过 lint 文件配置 我们可以在 lint.xml 文件中指定 lint 检查偏好设置。如果我们是手动创建此文件,请将其放置在 Android 项目的根目录下。lint.xml 文件由封闭的 <lint> 父标记组成,此标记包含一个或多个 < issue > 子元素。lint 会为每个 < issue > 定义唯一的 id 属性值。<?xml version="1.0" encoding="UTF-8"?><lint> <!-- list of issues to configure --></lint>Tips:我们可以通过在 issue 标记中设置严重级别属性来更改某个问题的严重级别或对该问题停用 lint 检查。如需查看 lint 支持的问题及其对应的问题 ID 的完整列表,请运行 lint --list 命令。以下是 lint.xml 文件示例:<?xml version="1.0" encoding="UTF-8"?><lint> <!-- Disable the given check in this project --> <issue id="IconMissingDensityFolder" severity="ignore" /> <!-- Ignore the ObsoleteLayoutParam issue in the specified files --> <issue id="ObsoleteLayoutParam"> <ignore path="res/layout/activation.xml" /> <ignore path="res/layout-xlarge/activation.xml" /> </issue> <!-- Ignore the UselessLeaf issue in the specified file --> <issue id="UselessLeaf"> <ignore path="res/layout/main.xml" /> </issue> <!-- Change the severity of hardcoded strings to "error" --> <issue id="HardcodedText" severity="error" /></lint>
- 6. gradle.projects 文件 这个文档一般我们在日常开发中不需要去动它,这个文档主要是项目范围的梯度设置,通过 AndroidStudio 配置的渐变设置将覆盖此文件中指定的任何设置。# Project-wide Gradle settings.# IDE (e.g. Android Studio) users:# Gradle settings configured through the IDE *will override*# any settings specified in this file.# For more details on how to configure your build environment visit# http://www.gradle.org/docs/current/userguide/build_environment.html# Specifies the JVM arguments used for the daemon process.# The setting is particularly useful for tweaking memory settings.org.gradle.jvmargs=-Xmx1024m# When configured, Gradle will run in incubating parallel mode.# This option should only be used with decoupled projects. More details, visit# http://www.gradle.org/docs/current/userguide/multi_project_builds.html#sec:decoupled_projects# org.gradle.parallel=true通过上面的代码我们看到主要有一句没有注释,第 9 行,这句的作用就是设置运行时的最大内存。Tips: 这里分享一个经验,如果你的电脑编译项目耗时比较久,我们可以修改这个文件的配置,适当增加编译时的内存,使 Gradle 独立运行。笔者亲测有效:第11、12行。# Project-wide Gradle settings.# IDE (e.g. Android Studio) users:# Gradle settings configured through the IDE *will override*# any settings specified in this file.# For more details on how to configure your build environment visit# http://www.gradle.org/docs/current/userguide/build_environment.html# Specifies the JVM arguments used for the daemon process.# The setting is particularly useful for tweaking memory settings.org.gradle.jvmargs=-Xmx2048m -XX:MaxPermSize=512m -XX:+HeapDumpOnOutOfMemoryError -Dfile.encoding=UTF-8# 提高AndroidStudio的并发性,使Gradle独立运行。org.gradle.parallel=trueorg.gradle.daemon=true
- 5. 包含其他 CMake 项目 如果想要构建多个 CMake 项目并在 Android 项目中包含它们的输出,我们可以使用一个 CMakeLists.txt 文件(即为我们关联到 Gradle 的那个文件)作为顶级 CMake 构建脚本,并添加其他 CMake 项目作为此构建脚本的依赖项。以下顶级 CMake 构建脚本会使用 add_subdirectory() 命令将另一个 CMakeLists.txt 文件指定为构建依赖项,然后关联其输出,就像处理任何其他预构建库一样。# Sets lib_src_DIR to the path of the target CMake project.set( lib_src_DIR ../gmath )# Sets lib_build_DIR to the path of the desired output directory.set( lib_build_DIR ../gmath/outputs )file(MAKE_DIRECTORY ${lib_build_DIR})# Adds the CMakeLists.txt file located in the specified directory# as a build dependency.add_subdirectory( # Specifies the directory of the CMakeLists.txt file. ${lib_src_DIR} # Specifies the directory for the build outputs. ${lib_build_DIR} )# Adds the output of the additional CMake build as a prebuilt static# library and names it lib_gmath.add_library( lib_gmath STATIC IMPORTED )set_target_properties( lib_gmath PROPERTIES IMPORTED_LOCATION ${lib_build_DIR}/${ANDROID_ABI}/lib_gmath.a )include_directories( ${lib_src_DIR}/include )# Links the top-level CMake build output against lib_gmath.target_link_libraries( native-lib ... lib_gmath )
- 4.5 开发商品数据访问类 商品数据访问类 GoodsDao 是本篇的重点,通过注入 JdbcTemplate 类型的组件,实现数据库操作。注入代码如下:实例:/** * 商品数据库访问类 */@Repository // 标注数据访问类public class GoodsDao { @Autowired private JdbcTemplate jdbcTemplate;}由于我们已经引入了 spring-boot-starter-jdbc 依赖,所以 Spring Boot 项目已经为我们自动配置了 JdbcTemplate 组件,我们拿来即用即可,这就是 Spring Boot 的强大之处!此时我们启动应用,发现报错信息:***************************APPLICATION FAILED TO START***************************Description:Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.Reason: Failed to determine a suitable driver class此处我们可以再度体会 Spring Boot 强大之处, Spring Boot 在为我们自动配置了 JdbcTemplate 之余,还在尝试自动为我们配置数据源 DataSource ,即 JdbcTemplate 要操作的真实数据库信息。报错信息已经提示我们,没有合适的数据库驱动、也没有合适的 URL 属性。
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