当然,它也有不好的地方,那就是datareader对象只能是根据read()方法判断,是一个只读的,仅向前的数据流.此外可以通过command对象的executereader来创建该对象.
下面是关于该控件的基本使用代码,希望对大家有用
<%@ Page Language="VB" ContentType="text/html" ResponseEncoding="gb2312" %>
<%@ import namespace="system.data"%>
<%@ import namespace="system.data.sqlclient"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<script language="vb" runat="server">
sub page_load(sender as object,e as eventargs)
dim cnn as sqlconnection
dim cmd as sqlcommand
dim html as string
dim datar as sqldatareader
@#建立连接对象
cnn=new sqlconnection("server=LYWS;uid=sa;pwd=sa;database=book")
cmd=new sqlcommand("select * from bookinfo",cnn)
cmd.connection.open()
@#将结果集赋给datareader对象
datar=cmd.executereader()
response.Write("<center><h2>图书信息表<h2><center>")
response.Write("<center><table border=1 style=@#width:18cm@#>")
response.Write("<tr>")
response.Write("<th>图书代码</th>")
response.Write("<th>图书名称</th>")
response.Write("<th>出版社</th>")
response.Write("<th>定价</th>")
response.Write("<th>版别</th>")
response.Write("<th>作者</th>")
response.Write("</tr>")
try
@#调用datareader对象的reader方法,通过while循环,遍利结果集
while (datar.read())
response.Write("<tr>")
response.Write("<td align=@#center@#>" + datar("图书代码").tostring() + "</td>")
response.Write("<td>" + datar("图书名称").tostring() + "</td>")
response.Write("<td>" + datar("出版社").tostring() + "</td>")
response.Write("<td align=@#right@#>" + datar("定价").tostring() + "</td>")
response.Write("<td>" + datar("版别").tostring() + "</td>")
response.Write("<td>" + datar("作者").tostring() + "</td>")
response.Write("</tr>")
end while
response.Write("</table></center>")
finally
datar.close()
cnn.close()
end try
end sub
</script>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>datareader对象测试!</title>
</head>
<body bgcolor="#9999ff">
<br>
<br>
<hr width="70%" align="center">
WEB+数据库设计系列 ->落叶无声 67060096
</body>
</html>
延伸阅读
文章来源于领测软件测试网 https://www.ltesting.net/
