第七讲 GeoDatabase

Size Limits
Up to DBMS limits
Versioning Support
Fully supported across all DBMSs; includes Not supported crosscross-database replication and updates Windows, Unix, Linux, and direct connections to DBMSs that can potentially run on any platform on the user's local network Provided by DBMS
Single user and small workgroups with smaller datasets Some readers and writer. one writer. Concurrent use eventually degrades for large numbers of readers. readers.
Windows file system management
Notes
Requires the use of ArcSDE
Allows you to Often used as an optionally attribute table store data in manager (via reada read-only Microsoft compressed Access). format to Users like the reduce string storage handling for text attributes. requirements
ipWorkspaceFactory = new AccessWorkspaceFactoryClass(); ipWorkspace = ipWorkspaceFactory.OpenFromFile(“D:\\project.mdb”, 0) ; ipFeatureWorkspace = ipWorkspace as IFeatureWorkspace ; pFeatureClass = ipFeatureWorkspace .OpenFeatureClass("Water") ;
All the contents in each personal geodatabase are held in a single Microsoft Access file (.mdb). Two GB per Access database Effective limit before performance degrades is typically between 250 and 500 MB per Access database file.
Geodatabase模型 §1 Geodatabase模型 1.1 概述
Geodatabase模型是ESRI公司在ArcGIS中推出的一种 Geodatabase模型是ESRI公司在ArcGIS中推出的一种 模型是ESRI公司在ArcGIS 新型的面向对象的空间数据库模型。 新型的面向对象的空间数据库模型。 它采用面向对象技术将现实世界抽象为由若干对象 类组成的数据模型，每个对象类有其属性 行为和 属性、 类组成的数据模型，每个对象类有其属性、行为和 规则，对象类之间又有一定的联系。 规则，对象类之间又有一定的联系。 按层次将地理数据组织成数据对象, Geodatabase 按层次将地理数据组织成数据对象,并 要素类、 存储在要素类 对象类和要素集中。 存储在要素类、对象类和要素集中。 是要素数据集、栅格和TIN Geodatabase 是要素数据集、栅格和TIN 数据集的集 合。
Not supported
Platforms
Crossplatform
Windows only
Security and Permissions
Operating file system security
Windows file system security
Database Full DBMS functions for Admin backup, recovery, File system istrati replication, SQL support, management on security, and so on Tools
本章主要内容
Geodatabase模型 1 Geodatabase模型 打开GeoDatabase GeoDatabase， 2 打开GeoDatabase， 访问Table FeatuerClass，FeatureDataSet等 Table， 3 访问Table，FeatuerClass，FeatureDataSet等
Single user and small workgroups Some readers and one writer per feature dataset, standalone feature class or table. Concurrent use of any specific file eventually degrades for large numbers of readers.
Key Character istics
ArcSDE Geodatabaseal Geodatabase
Number of Users
Multiuser Many readers and many writers ArcSDE can be licensed for use at three levels: Personal ArcSDE Workgroup ArcSDE Enterprise ArcSDE
2、打开数据库GeoDatabase GeoDatabase
2、3 其他文件打开方式 、
如 CadWorkspaceFactory, ArcInfoWorkspaceFactory, ShapefileWorkspaceFactory 参阅 参阅1.1方式修改代码。 方式修改代码。 方式修改代码 Shapefile：对于 ：对于Shapefile来说工作空间就是它所在的文件夹 来说工作空间就是它所在的文件夹 IWorkspaceFactory ipWorkspaceFactory; IWorkspace ipWorkspace; IFeatureWorkspace ipFeatureWorkspace ; ipWorkspaceFactory = new ShapefileWorkspaceFactoryClass(); ipWorkspace = ipWorkspaceFactory.OpenFromFile(“D:\\Data\\", 0) ; ipFeatureWorkspace = ipWorkspace as IFeatureWorkspace ;
了解IWorkspaceFactory IWorkspace IWorkspaceFactory 接口的关系
2、打开数据库GeoDatabase GeoDatabase
2、2 打开 、 打开ArcSDE Geodatabase（P235） （ ）
ipWorkspaceFactory = new SdeWorkspaceFactoryClass(); IPropertySet pPropertySet = new PropertySetClass(); //‘设置pPropertySet 中的参数.... IPropertySet pPropertySet = new PropertySetClass(); pPropertySet .SetProperty("server", "47020252DA6549F"); pPropertySet.SetProperty("Instance", "esri_sde"); pPropertySet .SetProperty("database", "sde"); pPropertySet .SetProperty("user", "sde"); pPropertySet .SetProperty("password", "sde"); pPropertySet .SetProperty("version", "sde.DEFAULT"); ipFeatureWorkspace = ipWorkspaceFactory.Open (pPropertySet, 0) ; 掌握打开SDE 数据库 与 mdb数据库的 差异
Storage Format
Oracle Microsoft SQL Server IBM DB2 IBM Informix
Each dataset is a separate file on disk A file geodatabase is a file folder that holds its dataset files. One TB for each dataset. Each file geodatabase can hold many datasets Each feature class can scale up to hundreds of millions of vector features per dataset.
2、打开数据库GeoDatabase GeoDatabase
数据库的三种类型 mdb数据库形式 数据库形式 文件形式（ shp,Tin,Raster） 文件形式（如shp,Tin,Raster） SDE数据库形式 数据库形式
2、打开数据库GeoDatabase GeoDatabase
2、1 打开 、 打开Personal Geodatabase（*.mdb） （ ）