T-SQL XML 参考

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T-SQL XML 参考 数据类型方法

本主题适用于:  SQL Server (starting with 2012) Azure SQL Database Azure SQL Data Warehouse  Parallel Data Warehouse 你可以使用xml数据类型方法来查询一个存储在一个变量或存储在一个xml类型的列中的XML实例。本章节中的主题讲解了如何使用xml数据类型方法。 在本章节中 主题讲解 query()方法(xml Data Type)讲解了如何使用query()方法来查询遍一个XML实例 value() Method (xml Data Type)讲解了如何使用value()方法来从一个XML实例中取得一个SQL类型的值。 exist() Method (xml Data Type)讲解了如何使用exist()方法来确定一个查询是否返回了非空结果。 modify() Method (xml D

IIS ASP内置对象参考 Session.Contents.Remove Method

The Remove method deletes a specific item from the Session object's Contents collection. Contents.Remove( ) Parameters This method has no parameters. Return Values This method has no return values. Parameters Item The name of the member to remove from the collection. Index The index entry for the member to remove from the collection. Example Code The following example adds and removes a variable n

IIS ASP内置对象参考 Session.Abandon Method

The Abandon method destroys all the objects stored in a Session object and releases their resources. If you do not call the Abandon method explicitly, the server destroys these objects when the session times out. Abandon( ) Parameters This method has no parameters. Return Values This method has no return values. Example Code The following example causes the session state to be released when the se

IIS ASP内置对象参考 Response.IsClientConnected

The IsClientConnected property is a read-only property that indicates if the client has reset the connection to the server. Syntax Response.IsClientConnected ( ) Applies To Response Object Remarks This property enables you greater control over circumstances where the client may have reset the connection to the server. For example, if a long period of time has elapsed between when a client request

IIS ASP内置对象参考 Response.ExpiresAbsolute

The ExpiresAbsolute property specifies the date and time at which a page cached on a browser expires. If the user returns to the same page before that date and time, the cached version is displayed. If a time is not specified, the page expires at midnight of that day. If a date is not specified, the page expires at the given time on the day that the script runs. Syntax Response.ExpiresAbsolute [=[

IIS ASP内置对象参考 Response.Expires

The Expires property specifies the duration of time before a page that is cached on a browser expires. If the user returns to the same page before it expires, the cached version is displayed. Syntax Response.Expires [**=**number] Parameters number The time, in minutes, before the page expires. Use -1 to specify immediate expiration. IIS returns an error if this number exceeds January 18, 2038 when

IIS ASP内置对象参考 Response.ContentType

The ContentType property specifies the HTTP content type for the response. If no ContentType is specified, the default is text/HTML. Syntax Response.ContentType [**=**ContentType] Parameters ContentType A string describing the content type. This string is usually formatted as type/subtype, where type is the general content category, and subtype is the specific content type. For a full list of supp

IIS ASP内置对象参考 Response.CodePage

For the current response, the Response.CodePage property specifies, how strings are encoded in the intrinsic objects. A code page is a character set that can include numbers, punctuation marks, and other glyphs. Codepages are not the same for each language. Some languages, such as Japanese and Hindi, have multibyte characters, while others, like English and German, only need one byte to represent

IIS ASP内置对象参考 Response.Charset

The Charset property appends the name of the character set (for example, ISO-8859-13) to the content-type header in the Response object. Syntax Response.Charset(CharsetName) Parameters CharsetName A string that specifies a character set for the page. The character set name is appended to the content-type header in the Response object. Applies To Response Object Remarks This property inserts any st

IIS ASP内置对象参考 Response.CacheControl

The CacheControl property enables you to set the HTTP/1.1 Cache Control header in Response.Syntax. The values for CacheControl are strings, and must be enclosed in quotation marks (" "). You must set CacheControl before any response is sent to the client, unless response buffering is enabled. Syntax Response.CacheControl [**=**Cache Control Header] Parameters Cache Control Header The following is

IIS ASP内置对象参考 Response.Buffer

The Buffer property indicates whether to buffer page output. When page output is buffered, the server does not send a response to the client until all of the server scripts on the current page have been processed, or until the Flush or End method is called. The Buffer property cannot be set after the server has sent output to the client. For this reason, the call to Response.Buffer should be the f

IIS ASP内置对象参考 Response.Write Method

The Write method writes a specified string to the current HTTP output. Write( variant ) Parameters variant The data to write. This parameter can be any data type supported by the VBScript VARIANT data type, including characters, strings, and integers. This value cannot contain the character combination %>; instead you should use the escape sequence %\>. The Web server translates the escape s

IIS ASP内置对象参考 Response.Redirect Method

The Redirect method causes the browser to redirect the client to a different URL. Redirect( URL ) Parameters URL The Uniform Resource Locator (URL) that the browser is redirected to. This can be an full URL beginning with "http://", a virtual path to a location on the same IIS server, or the name of a file contained in the same location as the original URL. URL can include a query string. Older We

IIS ASP内置对象参考 Response.Flush Method

The Flush method sends buffered output immediately. This method causes a run-time error if Response.Buffer has not been set to TRUE. Flush( ) Parameters This method has no parameters. Return Values This method has no return values. Applies To Response Object Remarks If the Flush method is called on an ASP page, the server does not honor Keep-Alive requests for that page. Requirements Client: Requi

IIS ASP内置对象参考 Response.End Method

The End method causes the Web server to stop processing the script and return the current result. The remaining contents of the file are not processed. End( ) Parameters This method has no parameters. Return Values This method has no return values. Applies To Response Object Remarks If Response.Buffer is set to TRUE, calling Response.End flushes the buffer. If you do not want output returned to th

IIS ASP内置对象参考 Response.Clear Method

The Clear method erases any buffered HTML output. However, the Clear method erases only the response body; it does not erase response headers. You can use this method to handle error cases. Note that this method causes a run-time error if Response.Buffer has not been set to TRUE. Clear( ) Parameters This method has no parameters. Return Values This method has no return values. Applies To Response

IIS ASP内置对象参考 Response.BinaryWrite Method

The BinaryWrite method writes the specified information to the current HTTP output without any character conversion. This method is useful for writing nonstring information, such as binary data required by a custom application. BinaryWrite( data ) Parameters data The data to write to the HTTP output. This parameter is of type VT_ARRAY | VT_UI1, which is a variant array of unsigned one-byte charact

IIS ASP内置对象参考 Response.AppendToLog Method

The AppendToLog method adds a string to the end of the Web server log entry for the request. You can use it multiple times in one section of script. Each time the method is used, it appends the specified string to the existing entry. AppendToLog( string ) Parameters string The text to append to the log file. Because fields in the log are comma-delimited, this string cannot contain any commas (,).

IIS ASP内置对象参考 Response.AddHeader Method

The AddHeader method adds a new HTML header and value to the response sent to the client. It does not replace an existing header of the same name. After a header has been added, it cannot be removed. PICS was originally designed to help parents and teachers control what children access on the Internet, but it also facilitates other uses for labels, including code signing and privacy. Other rating

IIS ASP内置对象参考 Session Object (IIS)

You can use the Session object to store information needed for a particular user session. Variables stored in the Session object are not discarded when the user jumps between pages in the application; instead, these variables persist for the entire user session. The Web server automatically creates a Session object when a Web page from the application is requested by a user who does not already ha

IIS ASP内置对象参考 Response.Cookies Collection

The Cookies collection sets the value of a cookie. If the specified cookie does not exist, it is created. If the cookie exists, it takes the new value, and the old value is discarded. Cookies should never be used to store secure data, such as passwords. Cookies are transmitted as clear text. If a malicious user taps an Internet connection, then they can take cookie data to impersonate a client and

IIS ASP内置对象参考 Request.ServerVariables Collection

The ServerVariables collection retrieves the values of predetermined environment variables and request header information. Server variables obtain most of their information from headers. It is wise to not trust the data that is contained in headers, as this information can be falsified by malicious users. For example, do not rely on data such as cookies to securely identify a user. As a security p

IIS ASP内置对象参考 Request.Cookies Collection

The Cookies collection enables you to retrieve the values of the cookies sent in an HTTP request. Cookies should never be used to store secure data, such as passwords. Cookies are transmitted as clear text. If a malicious user taps an Internet connection, then they can take cookie data to impersonate a client and gain access to their data. If you must transmit sensitive data, do so on a Secure Soc

IIS ASP内置对象参考 Request.QueryString Collection

The QueryString collection retrieves the values of the variables in the HTTP query string. The HTTP query string is specified by the values following the question mark (?). Several different processes can generate a query string. For example, the following anchor tag generates a variable named string with the value "this is a sample." <A HREF="example?string=this is a sample">string sample&l

IIS ASP内置对象参考 Request.ClientCertificate Collection

ClientCertificate集合从客户端浏览器传到Web服务器的安全性证书那里取得键和值的字段。在针对公共密钥证书的X.509 v 3标准中指定了这些字段。因为X.509没有一个官方标准,你可能会注意到得自不同的证书认证机构的证书各有所不同。欲进一步了解,请参阅W3C网站。 为了填充ClientCertificate集合的字段,Web服务器和客户端浏览器都必须支持SSL 3.0/PCT 1.0协议。网站必须启用安全套接层(SSL),并请求客户端证书。在启用了SSL之后,网站的URL将以“https://”开头,而不是以“http://”开头。客户端浏览器必须能够发送一个证书。如果没有发送证书,ClientCertificate集合返回EMPTY。 你必须配置你的Web服务器以请求客户端证书。 要想读取ClientCertificate集合中的每个字段的值,请传递一个键名以及可选的子字

IIS ASP内置对象参考 Request.Cookies Collection

>The Cookies collection enables you to retrieve the values of the cookies sent in an HTTP request. Cookies should never be used to store secure data, such as passwords. Cookies are transmitted as clear text. If a malicious user taps an Internet connection, then they can take cookie data to impersonate a client and gain access to their data. If you must transmit sensitive data, do so on a Secure So

T-SQL 函数参考 Text and Image - TEXTVALID

本主题适用于: SQL Server (starting with 2008) Azure SQL Database Azure SQL Data Warehouse  Parallel Data Warehouse 一个text、ntext、image函数,检查一个特定的文本指针是否有效。 Important 这个特性将在未来版本的Microsoft SQL Server中被删除。请避免在新开发工作中使用这个特性,并计划修改当前正在使用这个特性的应用程序。没有作为替补的功能。 句法 TEXTVALID ( 'table.column' ,text_ ptr ) 参数 table是要用到的表的名称。 column是要用到的列的名称。 text_ptr是要被检查的文本指针 返回值 int 备注 如果指针有效就把1,如果指针无效就返回0。注意针对text列的标识符必须包含表名称。如果没有一个有

JavaScript语言参考 valueOf 方法 (String)

返回字符串 语法 string.valueOf() 参数 此方法没有参数。 返回值 返回字符串值 备注 在下面的示例中,字符串对象与返回值相同。 var str = "every good boy does fine"; var strStr = str.valueOf(); if (str === strStr) document.write("same"); else document.write("different"); // Output: // same 必备条件 在以下文档模式中受支持:怪异模式、Internet Explorer 6标准模式、Internet Explorer 7标准模式、Internet Explorer 8标准模式、Internet Explorer 9标准模式、Internet Explorer 10标准模式、Internet Explorer 11标

JavaScript语言参考 prototype 属性 (Number)

为number的类返回原型的引用。 语法 number.prototype 备注 number参数是数字的名称。 Use the prototype property to provide a base set of functionality to a class of objects. New instances of an object "inherit" the behavior of the prototype assigned to that object. For example, to add a method to the Number object that returns the number of (integer) digits, declare the function, add it to Number.prototype, and then use it.

JavaScript语言参考 constructor 属性 (Number)

指定创建一个数字的函数。 语法 number.constructor 备注 必需的number是字符串的名称。 constructor属性是每个具有原型的对象的原型成员。这包括Global和Math对象之外所有内部JavaScript对象。constructor属性包含了对某种函数的引用,此种函数构造了特定对象的实例。 示例 下面的示例阐释了constructor属性的用法。 var num = new Number(); if (num.constructor == Number) document.write("Object is a Number."); else document.write("Object is not a Number."); // Output: // Object is a Number. 必备条件 在以下文档模式中受支持:怪异模式、Internet Exp

JavaScript语言参考 Number.isSafeInteger (Number)

返回一个布尔值,指示数字是否在JavaScript中安全表示。 语法 Number.isSafeInteger(numValue) 返回值 如果数字在Number.MIN_SAFE_INTEGER和Number.MAX_SAFE_INTEGER之间(包含),则为true;否则为false。 备注 Ja中的安全整数是应用任何传入前的IEEE-754双精度数字。 示例 // Returns true Number.isSafeInteger(-100) Number.isSafeInteger(9007199254740991) // Returns false Number.isSafeInteger(Number.NaN) Number.isSafeInteger(Infinity) Number.isSafeInteger("100") Number.isSafeInteger(9007

JavaScript语言参考 Number.isNaN 函数 (Number)

返回一个布尔值,该值指示某个值是否为保留值NaN(非数字)。 语法 Number.isNaN(numValue) 参数 numValue 必要参数。要针对NaN进行测试的值。 返回值 如果转换为Number类型的值为NaN,则为true,否则为false。 备注 通常使用此方法来测试parseInt方法和parseFloat方法的返回值。 Number.isNaN更正全局isNaN函数的问题。Number.isNaN仅在将其参数与NaN进行比较后将该参数转换为Number类型。因此,当且仅当传入的参数与NaN的值完全相同时,它才返回true。全局isNaN函数在进行比较之前将其参数转换为Number类型,这可能会导致非数字值返回true,而对Number.isNaN可能不会返回true。 必备条件 Microsoft Edge中受支持。应用商店应用(Windows 10 上的 Micros

JavaScript语言参考 Number.isInteger 函数 (Number)

返回一个布尔值,指示值是否为整数。 语法 Number.isInteger(numValue) 返回值 如果值是整数则返回true,否则返回false。 备注 必备条件 Microsoft Edge中受支持。应用商店应用(Windows 10 上的 Microsoft Edge)中也受支持。请参阅版本信息。 在以下文档模式中不受支持:怪异模式、Internet Explorer 6 标准模式、Internet Explorer 7 标准模式、Internet Explorer 8 标准模式、Internet Explorer 9 标准模式、Internet Explorer 10 标准模式和 Internet Explorer 11 标准模式。在 Windows 8.1 中不受支持。 Applies To: Number Object 示例 // Returns true Number.i

JavaScript语言参考 Number.isFinite 函数 (Number)

返回一个布尔值,指示值是否为有限数字。 语法 Number.isFinite(numValue) 返回值 如果值为NaN、+∞或-∞,就返回false,否则返回true。 备注 示例 // Returns true Number.isFinite(100) Number.isFinite(-100) Number.isFinite(100 / 3) // Returns false Number.isFinite(Number.NaN) Number.isFinite(Infinity) Number.isFinite("100") 必备条件 Microsoft Edge中受支持。应用商店应用(Windows 10 上的 Microsoft Edge)中也受支持。请参阅版本信息。 在以下文档模式中不受支持:怪异模式、Internet Explorer 6 标准模式、Internet Exp

JavaScript语言参考 Number 常量

以下数字常量是Number对象的属性。 Number对象常量 你不必创建Number对象来访问这些常量。 常量返回的值 Number.EPSILON可以在JavaScript中表示的最小数字。大约等于2.2204460492503130808472633361816E-16。 Number.MAX_SAFE_INTEGER可在JavaScript中安全表示的最大数字。等于9007199254740991。 Number.MAX_VALUE可在JavaScript中表示的最大数字。大约等于1.79E+308。 Number.MIN_SAFE_INTEGER可在JavaScript中安全表示的最小数字。等于-9007199254740991。 Number.MIN_VALUE可在JavaScript中表示的最接近于零的数字。大约等于5.00E-324。 Number.NaN不是数字的值。在相等

JavaScript语言参考 Number 对象

一个表示任何类型的数字对象。所有JavaScript数字均为64位浮点数。 语法 numObj = new Number(value) 参数 numObj 必要参数。Number对象分析到的变量名称。 value 必要参数。数值。 备注 变量设置为数值(例如var num = 255.336;)时,JavaScript创建Number对象。很少需要显式创建Number对象。 除了从Object继承的属性和方法,Number对象自然还具有属性和方法。在某些情况下,数字将转换为字符串,例如在向字符串添加或串联数字时,以及在使用toString方法执行这些操作时。欲进一步了解,请参阅加法运算符 (+)。 JavaScript具有多个数字常量。欲获取完整列表,请参阅Number 常量。 必备条件 在以下文档模式中受支持:怪异模式、Internet Explorer 6标准模式、Internet E

JavaScript语言参考 Math 对象

提供基本数学功能和常量的内部对象。 语法 Math.[{property | method}] 参数 property 必要参数。Math对象的某个属性的名称。 method 必要参数。Math对象的某个方法的名称。 备注 无法使用new运算符创建Math对象。如果你尝试执行此操作,将出现错误。在加载脚本引擎时,该引擎会创建它。其所有的方法和属性始终对你的脚本可用。 必备条件 Math对象在Internet Explorer 6以前的版本中引用。 常量 下表列出了Math对象的常量。 常量描述 Math.E 常量数学常量e。这是欧拉数,自然对数的底。 Math.LN2 Constant2的自然对数。 Math.LN10 常量10的自然对数。 Math.LOG2E 常量以2为底的e的对数。 Math.LOG10E 常量以10为底的e的对数。 Math.PI 常量π。这是圆的周长与走私的比率。

JavaScript语言参考 valueOf 方法 (Map)

返回指定对象的原始值。 语法 mapObj.valueOf() 参数 mapObj 必要参数。Map对象。 属性值、返回值 返回Map实例。 必备条件 在Internet Explorer 11标准文档模式下支持此项。此外,也在应用商店应用(Windows 8.1和Windows Phone 8.1)中受支持。请参阅版本信息。 在以下文档模式中不受支持:怪异模式、Internet Explorer 6标准模式、Internet Explorer 7标准模式、Internet Explorer 8标准模式、Internet Explorer 9标准模式和Internet Explorer 10标准模式。在Windows 8中不受支持。

JavaScript语言参考 toString 方法 (Map)

返回映射的字符串表达形式。 语法 mapObj.toString() 参数 mapObj 必要参数。Map对象。 属性值、返回值 映射的字符串表示形式。 异常 必备条件 在Internet Explorer 11标准文档模式下支持此项。此外,也在应用商店应用(Windows 8.1和Windows Phone 8.1)中受支持。请参阅版本信息。 在以下文档模式中不受支持:怪异模式、Internet Explorer 6标准模式、Internet Explorer 7标准模式、Internet Explorer 8标准模式、Internet Explorer 9标准模式和Internet Explorer 10标准模式。在Windows 8中不受支持。