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。
We can use SQL to specify how to sort the data in the recordset. We want to display the “Companyname” and “Contactname” fields in the “Customers” table and sort them by “Companyname” (please remember to usethe Sort records in descending order based on the specified field name How to sort data according to a specified field name Allow users to choose which column to sort based on Let the user choose which column to sort Sort the data ¶
.asp save for suffix):Example ¶
<html> <body> <% set conn=Server.CreateObject("ADODB.Connection") conn.Provider="Microsoft.Jet.OLEDB.4.0" conn.Open "c:/webdata/northwind.mdb" set rs = Server.CreateObject("ADODB.recordset") sql="SELECT Companyname, Contactname FROM Customers ORDER BY CompanyName" rs.Open sql, conn %> <table border="1" width="100%"> <tr> <%for each x in rs.Fields response.write("
" & x.name & "") next%> tr> <%do until rs.EOF%> <tr> <%for each x in rs.Fields%> <td><%Response.Write(x.value)%>td> <%next rs.MoveNext%> tr> <%loop rs.close conn.close%> table> body> html> More Instance ¶