编写的组件中使用 如何在ASP中使用mySQL

Using A mySQL Databases by Ben O'Neill Databases are the best way to keep your web site up-to-date and dynamic. Databases are used these days by thousands of web sites. They are used for storing news and general information. Web sites like the ASP Index (www.aspin.com) are run on large databases. Databases make a web site easy to update and once you have the base script, to add, remove and modify things in a database is very easy. To start you need to know how to connect to a database. ASP can connect to virtually any type, from Microsoft Access to SQL. In this example I'll be using mySQL and OLE DB to connect to it. mySQL can be downloaded from the mySQL web site (www.mysql.com). You will also need the provider used to connect to it, also available from the mySQL web site. You may be asking what's OLE DB? I'm used to ODBC and DSN. OLE DB is faster and more stable. It's almost exactly the same. First we need to connect to the database, because it's a mySQL database you also need to supply a database name. (in mySQL you can have mulitple databases on the same SQL server.) And now we've connected. Let's pretend we've got a big list of lots and lots of email addresses, here's the contents of our database, it allows me to show you how it works better. Table Name: emailadds name牋牋牋牋牋牋牋?牋牋牋牋牋?emailadd ------------------------------------------------------ Ben牋牋牋牋牋牋牋牋?牋牋牋牋牋[email protected] Fred牋牋牋牋牋牋牋牋 牋牋牋牋牋[email protected] Ben Harding牋牋 牋牋牋牋牋[email protected] Dave Geralding 牋牋牋牋牋[email protected] Now we have the database open let's run a query to list and output all the names and email address in a nice easy to view table. ?/span> 牋 ?/span> 牋 牋 ?/span> There we go. If no records are found then it says Sorry, no email addresses found". That query is simple enough, it tells the database to get (SELECT) all the records and all the fields from the table named emailadds. How about we make it only show people with the name ben" somewhere in their name, simple change the query to this: SELECT * FROM emailadds WHERE name LIKE '%ben%' That query would return only 2 records, Ben and Ben Harding. It's important you use single quotes ('), because double quotes won't work. You can also be very selective and do: SELECT * FROM emailadds WHERE name='Ben' That query would only return Ben, not Fred or Ben Harding, or Dave Geralding. After using databases you should always clear up. Close the database and the record set, and set them to nothing so that the memory used by them is regained, do this by writing this: