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ADO Open 方法
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The Open method opens an existing Record object or creates a new file or directory.
Open的作用是：打开一个现有的Record[记录]对象或创建一个新的文件或目录。
Syntax
语法
Open(source,actconn,mode,createopt,opt,username,psword) |
| Parameter参数 | Description描述 |
|---|---|
| source | Optional. The source parameter may be one of the following: 可选参数。可使用的源参数如下：
|
| actconn | Optional. A connection string or a Connection object 可选参数。指定一个连接字符串或连接对象 |
| mode | Optional. A ConnectModeEnum value, that indicates the access mode of the Record object. Default is adModeUnknown 可选参数。指定一个用来指示记录对象访问模式的ConnectModeEnum值。默认值为adModeUnknown |
| createopt | Optional. A RecordCreateOptionsEnum value, that indicates whether an existing file/directory should be opened, or a new file/directory should be created. Default is adFailIfNotExists. This parameter will be ignored if the source parameter is not a URL 可选参数。指定一个用来指示是否需要打开一个现有的文件/目录或者是否需要创建一个新的文件/目录的RecordCreateOptionsEnum值。默认值为adFailIfNotExists。如果源参数不是一个URL，那么该参数将被忽略 |
| opt | Optional. One or more RecordOpenOptionsEnum values, that specifies the options for opening the Record. Default is adOpenRecordUnspecified 可选参数。指定一个用于指明记录开启选项的一个或多个RecordOpenOptionsEnum值。默认值为adOpenRecordUnspecified |
| username | Optional. A user ID that authorizes access to source 可选参数。指定允许访问数据源的授权用户ID |
| psword | Optional. A password that verifies the username 可选参数。指定授权用户的用户名相对应的密码 |
Example
案例
| Example 1: source as the URL of a folder: set rec = Server.CreateObject("ADODB.record") Example 2: source as a relative URL in a Connection object: set conn=Server.CreateObject("ADODB.Connection") Example 3: source as a row in a Recordset object: set rs = Server.CreateObject("ADODB.recordset") |
ConnectModeEnum Values
| Constant常量 | Value值 | Description描述 |
| adModeUnknown | 0 | Default. Permissions have not been set or cannot be determined 默认值。表明权限尚未设置或无法确定 |
| adModeRead | 1 | Read-only 只读 |
| adModeWrite | 2 | Write-only 只写 |
| adModeReadWrite | 3 | Read/write 可读/可写 |
| adModeShareDenyRead | 4 | Prevents others from opening a connection with read permissions 防止其他用户使用读权限打开连接 |
| adModeShareDenyWrite | 8 | Prevents others from opening a connection with write permissions 防止其他用户使用写权限打开连接 |
| adModeShareExclusive | 12 | Prevents others from opening a connection 防止其他用户打开连接 |
| adModeShareDenyNone | 16 | Allows others to open a connection with any permissions 防止其他用户使用任何权限打开连接 |
| adModeRecursive | 0x400000 | Used with adModeShareDenyNone, adModeShareDenyWrite, or adModeShareDenyRead to set permissions on all sub-records of the current Record 组合使用adModeShareDenyNone、adModeShareDenyWrite或adModeShareDenyRead对当前记录的所有子记录设置权限 |
RecordCreateOptionsEnum Values
| Constant常量 | Value值 | Description描述 |
|---|---|---|
| adFailIfNotExists | -1 | Default. Fails if the source parameter points to a node that not exists 默认值。如果source[源]参数指向的节点不存在，那么操作将会失败 |
| adCreateNonCollection | 0 | Creates a new Record of type adSimpleRecord 创建一个新的adSimpleRecord型记录 |
| adCreateCollection | 0x2000 | Creates a new Record specified by the source parameter. If it points to an existing node, an error will occur. To prevent the error combine this value with adOpenIfExists or adCreateOverwrite 创建一个全新的由source参数指定的记录。如果指向的节点不存在，那么将产生错误。你可以事先使用adOpenIfExists或 adCreateOverwrite测试，以阻止错误的发生 |
| adOpenIfExists | 0x2000000 | If the source points to an existing node or Record object, then the provider must open the existing Record instead of creating a new one. This value cannot be used with adCreateOverwrite 如果source参数指向一个现存的节点或Record[记录]对象，那么技术提供对象[provider]必须是打开现存的记录，而不是创建一个新的记录。该值不能与adCreateOverwrite一起使用 |
| adCreateOverwrite | 0x4000000 | If the source points to an existing node or Record, then the existing Record will be overwritten and a new one is created in its place. This value cannot be used with adOpenIfExists 如果source参数指向一个现存的节点或Record[记录]，那么现有的记录将被覆盖，并且在同一个位置将创建一个全新的记录。该值不能与adOpenIfExists一起使用 |
| adCreateStructDoc | 0x80000000 | Creates a new Record of type adStructDoc 创建一个全新的adStructDoc型记录 |
RecordOpenOptionsEnum Values
| Constant常量 | Value值 | Description描述 |
|---|---|---|
| adOpenRecordUnspecified | -1 | Default. No options are specified 默认值。不指定任何选项 |
| adOpenAsync | 0x1000 | Opens the Record object in asynchronous mode 以异步方式打开Record[记录]对象 |
| adDelayFetchStream | 0x4000 | The default stream associated with the Record need not be retrieved initially 指定与记录相关的默认记录流不需要在一开始提取 |
| adDelayFetchFields | 0x8000 | The fields associated with the Record need not be retrieved initially, but can be retrieved at the first attempt to access the field 指定与记录相关的字段不需要在一开始提取，但是可以在第一次尝试访问字段时提取 |
| adOpenExecuteCommand | 0x10000 | The source contains command text that should be executed 指定包含执行指令文本的Source对象 |
| adOpenOutput | 0x800000 | If the source points to a node that contains an executable script, then the opened Record will contain the results of the executed script. This value is only valid with non-collection records 如果source对象指向的节点包含了可执行的脚本程序，那么在打开的记录中将包含这个脚本执行后的结果。这个值仅在空集[non-collection]记录中有效 |
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