最近几年来,地理信息系统无论是在理论上还是应用上都处在一个飞速发展的阶段。 GIS被应用于多个领域的建模和决策支持,如城市管理、区划、环境整治等等,地理信息成为信息时代重要的组成部分之一; “数字地球”概念的提出,更进一步推动了作为其技术支撑的GIS的发展。 与此同时,一些学者致力于相关的理论研究,如空间感知、空间数据误差、空间关系的形式化等等。 这恰好说明了地理信息系统作为应用技术和学科的两个方面,并且这两个方面构成了相互促进的发展过程。
Record object (ADO version 2.5) ¶
ADO Record object is used to hold a row in a recordset, or a file or directory of a file system.
Versions prior to ADO 2.5 can only access structured databases. In a structured database, each table has exactly the same number of columns in each row, and each column is made up of the same data type.
Record object allows access to datasets with the number of columns and /or different data types between rows.Grammar ¶
objectname.property objectname.method
Attribute ¶
Attribute | Description |
|---|---|
ActiveConnection | Sets or returns the Record object to which the Connection object currently belongs. |
Mode | Sets or returns valid permissions to modify data in a Record object. |
ParentURL | Returns the absolute URL of the parent Record. |
RecordType | Returns the type of the Record object. |
Source | Sets or returns the src parameter of the Open method of the Record object. |
State | Returns the state of the Record object. |
Method ¶
Method | Description |
|---|---|
| Cancel once |
| Close one. |
| Copy a file or directory to another location. |
| Delete a file or directory. |
| Returns a |
| Move a file or directory to another location. |
| Open an existing |
Set ¶
Set | Description |
|---|---|
Properties | A collection of specific provider properties. |
Fields | Contains all Field objects in the Record object. |
Properties of the Fields collection ¶
Attribute | Description |
|---|---|
| Return the Example: countfields = rec.Fields.Count |
| Return Example: itemfields = rec.Fields.Item(1) 或者 itemfields = rec.Fields.Item("Name") |