IWorkspace接口提供访问工作空间的通用属性和方法,如它的连接属性,以及包含的数据集的方法。
IWorkspace的成员字段:
Members
Description |
|
The connection properties of the workspace. |
|
The DatasetNames in the workspace. |
|
The datasets in the workspace. |
|
Executes the specified SQL statement. |
|
Checks if the workspace exists. |
|
TRUE if the workspace is a file system directory. |
|
The file system full path of the workspace. |
|
The Type of the Workspace. |
|
The factory that created the workspace. |
如何打开一个数据库
要打开一个数据库,也就意味着我们要得到那个工作空间,而工作空间是一个普通类,也就意味着我们只
能从其他类来得到这个工作空间,这个类就是工作空间工厂(WorkspaceFactory),而这个类又是一个抽
象类,也就意味着我们只能使用它的子类来实例化一个对象,WorkspaceFactory有众多的子类
IWorkSpaceFactory是Geodatabase的入口,它定义了数据库的通用属性,比如打开,创建等,我们在ArcGIS Engine的帮助中可以详细的得到它的信息,如下图:
Members
Description |
||
Indicates if parentDirectory contains a valid workspace, or is a valid file-system workspace. |
||
Copies a workspace to the specified destination folder. |
||
Creates a new workspace specified by the directory, file name, and connection properties. |
||
The class ID of the WorkspaceFactory. |
||
Retrieves the workspace name of a workspace from the given list of file names. |
||
True if the specified file identifies a workspace supported by the workspace factory. |
||
Moves a workspace to the specified destination folder. |
||
Opens the workspace specified by the connection properties. |
||
Opens the workspace specified by the given file name. |
||
The connection properties from the specified file. |
||
A singular or plural description of the type of workspace the workspace factory opens/creates. |
||
The type of workspace the workspace factory opens/creates. |
打开数据库有两种方式,从上面的图表中也可以看出OpenFromFile方法和Open方法,这两者的区
方法中的参数不同,其中Open方法需要一个IPropertySet对象,这个方法我们经常在打开SDE数
使用,注意(这个方法同样可以用来打开个人数据库,文件数据库)。
打开个人数据库
public IWorkspace GetMDBWorkspace(String _pGDBName)
{
IWorkspaceFactory pWsFac = new AccessWorkspaceFactoryClass();
IWorkspace pWs = pWsFac.OpenFromFile(_pGDBName,0);
return pWs;
}
}
打开文件数据库
public IWorkspace GetFGDBWorkspace(String _pGDBName)
{
IWorkspaceFactory pWsFac = new FileGDBWorkspaceFactoryClass();
IWorkspace pWs = pWsFac.OpenFromFile(_pGDBName, 0);
return pWs;
}
打开SDE数据库
打开SDE数据库我们使用的是Open方法,要用这个方法,我们就要对IPropertySet对象设置,要打开SDE
数据库,我们要获取SDE数据库的服务器地址,数据库实例,数据库,用户,密码等参数。而IPropertySet
就好比一个Key-Value的对象,用来帮组我们设置这些,然后传到Open方法中。
public IWorkspace GetSDEWorkspace(String _pServerIP, String _pInstance, String _pUser, String
_pPassword, String _pDatabase, String _pVersion)
{
ESRI.ArcGIS.esriSystem.IPropertySet pPropertySet = new
ESRI.ArcGIS.esriSystem.PropertySetClass();
pPropertySet.SetProperty("SERVER", _pServerIP);
pPropertySet.SetProperty("INSTANCE", _pInstance);
pPropertySet.SetProperty("DATABASE", _pDatabase);
pPropertySet.SetProperty("USER", _pUser);
pPropertySet.SetProperty("PASSWORD", _pPassword);
pPropertySet.SetProperty("VERSION", _pVersion);
ESRI.ArcGIS.Geodatabase.IWorkspaceFactory2 workspaceFactory;
workspaceFactory = (ESRI.ArcGIS.Geodatabase.IWorkspaceFactory2)new
ESRI.ArcGIS.DataSourcesGDB.SdeWorkspaceFactoryClass();
return workspaceFactory.Open(pPropertySet, 0);
}