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ADO Open 方法
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The Open method is used to open a Stream object.
Open的作用是：打开一个Strean[记录流]对象。
Syntax
语法
objStream.Open source,mode,opt,username,psword |
| Parameter参数 | Description描述 |
|---|---|
| source | Optional. The data source for the Stream object (a URL that points to an existing node in a tree structure, like an e-mail or file system or a reference to an already opened Record object). If source is not specified, a new Stream object, with a size of zero, will be created and opened 可选参数。指定Stream[记录流]对象的数据源（一个指向树型结构的现存节点，如一个e-mail，或是一个文件系统，或是一个记录对象（该记录对象已打开）的参数）。如果未指定数据源，那么将创建并打开一个全新的0长度的Stream[记录流]对象 |
| mode | Optional. A ConnectModeEnum value that specifies the access mode for a Stream object. Default is adModeUnknown 可选参数。指定一个用来指示Stream[记录流]对象访问模式的ConnectModeEnum值。默认值为adModeUnknown |
| opt | Optional. A StreamOpenOptionsEnum value that specifies options for opening a Stream object. Default is adOpenStreamUnspecified 可选参数。指定一个用于指明Stream[记录流]对象开启选项的一个或多个RecordOpenOptionsEnum值。默认值为adOpenRecordUnspecified |
| username | Optional. A name of a user who can access the Stream object. If Source is an already opened Record, this parameter is not specified 可选参数。指定允许访问数据源的授权用户ID。如果数据源是一个已经打开的记录，那么不需要指定该参数 |
| psword | Optional. A password that validates the username. If Source is an already opened Record, this parameter is not specified 可选参数。指定授权用户的用户名相对应的密码。如果数据源是一个已经打开的记录，那么不需要指定该参数 |
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 |
StreamOpenOptionsEnum Values
| Constant常量 | Value值 | Description描述 |
|---|---|---|
| adOpenStreamUnspecified | -1 | Default. Opens the Stream object with default options 默认值。使用默认选项打开Stream[记录流]对象 |
| adOpenStreamAsync | 1 | Opens the Stream object in asynchronous mode 以异步方式打开Stream[记录流]对象 |
| adOpenStreamFromRecord | 4 | Identifies the contents of the Source parameter to be an already open Record object. The default behavior is to treat Source as a URL that points directly to a node in a tree structure. The default stream associated with that node is opened. 将Source参数的内容视为一个已经打开的Record对象。默认的特性是将数据源视为直接指向一个树形结构的节点的URL。该节点默认的记录流是打开的 |
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