Home > Others

ADO Beginner's Tutorial: ADO through GetString () acceleration Script

Source: Internet
Author: User
Tags query string
Developer on Alibaba Coud: Build your first app with APIs, SDKs, and tutorials on the Alibaba Cloud. Read more ＞

Author: Please use the GetString () method to speed up your ASP script (to replace multiple rows of Response.Write).

Instance

Using GetString ()

How to use GetString () to display data in a recordset in an HTML table.

Multi-line Response.Write

The following example shows one way to display a database query in an HTML table:

The following are the referenced contents:

<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")
Rs. Open "Select Companyname, ContactName from Customers", Conn
%>
<table border= "1" width= "100%" >
<%do until Rs. Eof%>
<tr>
<td><%response.write (Rs.fields ("Companyname"))%></td>
<td><%response.write (Rs.fields ("ContactName"))%></td>
</tr>
<%rs. MoveNext
Loop%>
</table>
<%
Rs.close
Conn.close
Set rs = Nothing
Set conn = Nothing
%>
</body>

For a large query, this increases the processing time for the script, because the server needs to handle a large number of Response.Write commands.

The solution is to create all the strings, from <table> to </table>, and then output them-using only once Response.Write.

GetString () method

The GetString () method gives us the ability to display all strings using only one Response.Write at a time. And it doesn't even need do. Loop code and conditional tests to check whether the recordset is in EOF.

Grammar

str = Rs. GetString (format,rows,coldel,rowdel,nullexpr)

To create an HTML table using data from a recordset, we only need to use three of the above parameters (all of the parameters are optional):

Coldel-HTML used as a column separator

Rowdel-HTML used as a row delimiter

NULLEXPR-HTML used when column is empty

Note: the GetString () method is an attribute of ADO 2.0. You can download the ADO 2.0:http://www.microsoft.com/data/download.htm from the address below

In the following example, we will use the GetString () method to save the recordset as a string:

The following are the referenced contents:

<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")
Rs. Open "Select Companyname, ContactName from Customers", Conn
Str=rs. GetString (,, "</td><td>", "</td></tr><tr><td>", "")
%>
<table border= "1" width= "100%" >
<tr>
<td><%response.write (str)%></td>
</tr>
</table>
<%
Rs.close
Conn.close
Set rs = Nothing
Set conn = Nothing
%>
</body>

The above variable str contains a string of all columns and rows returned by the SELECT statement. </td><td> appears between each column, </td></tr><tr><td> appears between each row. So, with only one Response.Write, we get the HTML we need.



This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
ado net tutorial c# ado php php ado ado tickets ado net msdn ado net c# example ado net books

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

What's Trending
Top 10 Tags
datastax versions naming convention zookeeper client class definition md5 microsoft sql server 2005 data structures exception handling error handling
Top 10 Keywords
microsoft download center down wordpress address url site address url wordpress address url windows installer 4 0 download 302 not found web address url definition site address url wordpress db2 integer mac os installation step by step pdf abbreviation for return

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

Get Started for Free

  • Sales Support

    1 on 1 presale consultation

    Chat Contact Sales

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

    Open a Ticket

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.

    Learn More