ADO 查询数据
我们可以使用 SQL 来创建查询，以指定仅查看某些记录（和字段）。
显示选定数据
显示以“A”开头的公司
在这里，我们想只显示“Customers”表中“CompanyName”以“A”开头的记录（记得将文件保存为 .asp 扩展名）。
<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 WHERE CompanyName LIKE 'A%'"
rs.Open sql, conn
%>
<table border="1" width="100%">
<tr>
<%for each x in rs.Fields
response.write("<th>" & x.name & "</th>")
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>
显示来自西班牙的客户
在这里，我们想只显示来自西班牙的客户（记得将文件保存为 .asp 扩展名）。
<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 WHERE Country='Spain'"
rs.Open sql, conn
%>
<table border="1" width="100%">
<tr>
<%for each x in rs.Fields
response.write("<th>" & x.name & "</th>")
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>
为用户创建过滤器
在这里，我们想创建一个过滤器，让用户选择要显示客户的国家（记得将文件保存为 .asp 扩展名）。
<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 DISTINCT Country FROM Customers ORDER BY Country"
rs.Open sql, conn
country=request.form("country")
%>
<form method="post">
选择国家 <select name="country">
<% do until rs.EOF
response.write("<option")
if rs.fields("country")=country then
response.write(" selected")
end if
response.write(">")
response.write(rs.fields("Country"))
rs.MoveNext
循环
rs.Close
set rs=Nothing %>
</select>
<input type="submit" value="显示客户">
</form>
<%
if country<>"" then
sql="SELECT Companyname,Contactname,Country FROM Customers WHERE country='" & country & "'"
set rs=Server.CreateObject("ADODB.Recordset")
rs.Open sql,conn
%>
<table width="100%" cellspacing="0" cellpadding="2" border="1">
<tr>
<th>公司名称</th>
<th>联系人姓名</th>
<th>国家</th>
</tr>
<%
do until rs.EOF
response.write("<tr>")
response.write("<td>" & rs.fields("companyname") & "</td>")
response.write("<td>" & rs.fields("contactname") & "</td>")
response.write("<td>" & rs.fields("country") & "</td>")
response.write("</tr>")
rs.MoveNext
循环
rs.close
conn.Close
set rs=Nothing
set conn=Nothing%>
</table>
<% end if %>
</body>
</html>
