?
Solved

Sample JSP code w/ MYSQL

Posted on 2002-04-04
27
Medium Priority
?
331 Views
Last Modified: 2010-04-01
Can someone pass along some sample code connecting to a MYSQL DB w/ Java Server Pages?
0
Comment
Question by:AndySulz
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 13
  • 13
27 Comments
 
LVL 6

Expert Comment

by:kotan
ID: 6920049
Sample code...

<%@ page import="java.sql.*" %>

<%
Class.forName("org.gjt.mm.mysql.Driver");
           
Connection conn = DriverManager.getConnection("jdbc:mysql://host:3306/databasename", "userid", "password");
               
PreparedStatement stmt1 = conn.prepareStatement("select field1, field2 from table");

ResultSet rs = stmt1.executeQuery();

while (rs.next())
{
  rs.getString(1);
  rs.getString(2);
}

conn.close();
%>
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6920753
one small change :-)

<%@ page import="java.sql.*" %>

<%
Class.forName("org.gjt.mm.mysql.Driver");
           
Connection conn = DriverManager.getConnection("jdbc:mysql://host:3306/databasename", "userid", "password");
               
PreparedStatement stmt1 = conn.prepareStatement("select field1, field2 from table");

ResultSet rs = stmt1.executeQuery();

while (rs.next())
{
 rs.getString(1);
 rs.getString(2);
}
rs.close();
conn.close();
%>

CJ
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921120
do you know where i can download the jdbc drivers for win32 platform?
0
What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

 
LVL 19

Expert Comment

by:cheekycj
ID: 6921152
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921156
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921228
I downloaded all the classes, I extracted them to the classes folder in the Apache TomCat dir...i'm still getting the same error...i don't think i put the classes in the right place.

Andy
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921234
I downloaded all the classes, I extracted them to the classes folder in the Apache TomCat dir...i'm still getting the same error...i don't think i put the classes in the right place.

Andy
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921235
I downloaded all the classes, I extracted them to the classes folder in the Apache TomCat dir...i'm still getting the same error...i don't think i put the classes in the right place.

Andy
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921243
I downloaded all the classes, I extracted them to the classes folder in the Apache TomCat dir...i'm still getting the same error...i don't think i put the classes in the right place.

Andy
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921244
sorry about that, i was hitting refresh and it posted a few more...
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921408
which JDBC driver did you use?
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921413
2.0.4
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921417
The jar file, entitled mysql_comp.jar should be placed in the Tomcat lib folder
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921424
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921433
ok, i got an access denied error which is on my end...the code you sent before was to connect to a PW protected DB, how would I need to modify this to connect with no password?
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921456
i got it to work, but nothing prints on the screen...
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921475
what is the current code that you are using?

CJ
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921480
And when you run the same query directly against MySQL DB what gets returned?
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921536
<%@ page import="java.sql.*" %>

<%
Class.forName("org.gjt.mm.mysql.Driver");
         
Connection conn = DriverManager.getConnection("jdbc:mysql://SERVER1:3306/DB", "UN", "PW");
             
PreparedStatement stmt1 = conn.prepareStatement("select FirstName, LastName from tblPeople");

ResultSet rs = stmt1.executeQuery();

while (rs.next())
{
rs.getString(1);
rs.getString(2);
}
rs.close();
conn.close();
%>
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921549
try modifying it to this.. and see what gets printed:

<%@ page import="java.sql.*" %>

<%
Class.forName("org.gjt.mm.mysql.Driver");
         
Connection conn = DriverManager.getConnection("jdbc:mysql://SERVER1:3306/DB", "UN", "PW");
%>
Got Connection<br>
<%          
PreparedStatement stmt1 = conn.prepareStatement("select FirstName, LastName from tblPeople");
ResultSet rs = stmt1.executeQuery();
%>
Got Resultset<br>
Printing Resultset:<br>
<%
while (rs.next())
{
rs.getString(1);
rs.getString(2);
}
%>
Done with Resultset<br>
Closing up<br>
<%
rs.close();
conn.close();
%>
Done.


Could you try that and tell me what gets displayed.

Also make sure that tblPeople has data in it.

CJ
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921586
there is data in the tblPeople table.  this is what i get.

Got Connection
Got Resultset
Printing Resultset:
Done with Resultset
Closing up
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921598
I don't think it executes the while statement.
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921611
I wonder if you can use prepared statement at all with 2.0.4

replace:
<%          
PreparedStatement stmt1 = conn.prepareStatement("select FirstName, LastName from tblPeople");
ResultSet rs = stmt1.executeQuery();
%>
with:
<%          
Statement stmt = conn.createStatement();
Resultset rs = stmt.executeQuery("select FirstName, LastName from tblPeople");
%>

See if that changes anything.

CJ
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921614
I think if you want to use Prepared Statements you may have to get the latest mysql jdbc driver from here:
http://sourceforge.net/project/showfiles.php?group_id=15923&release_id=72107

version 2.0.11 supports a lot more (including prepared statements)
0
 
LVL 19

Accepted Solution

by:
cheekycj earned 200 total points
ID: 6921625
Scratch all that.. the reason why its not printing is b/c we are not making it print :-)

This will work :-)


<%@ page import="java.sql.*" %>

<%
Class.forName("org.gjt.mm.mysql.Driver");
       
Connection conn = DriverManager.getConnection("jdbc:mysql://SERVER1:3306/DB", "UN", "PW");
%>
Got Connection<br>
<%          
PreparedStatement stmt1 = conn.prepareStatement("select FirstName, LastName from tblPeople");
ResultSet rs = stmt1.executeQuery();
%>
Got Resultset<br>
Printing Resultset:<br>
<%
while (rs.next()) {
%>
<%=rs.getString(1);%>
<%=rs.getString(2);%>
<%
}
%>
Done with Resultset<br>
Closing up<br>
<%
rs.close();
conn.close();
%>
Done.
0
 
LVL 2

Author Comment

by:AndySulz
ID: 6921685
cheekyci,

I changed rs.getString(1); to

out.println(rs.getString("FirstName"));

looks like everything works now.

Thanks.
0
 
LVL 19

Expert Comment

by:cheekycj
ID: 6921710
Glad you got it working.  Thanx for the "A".

CJ
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article lists the top 5 free OST to PST Converter Tools. These tools save a lot of time for users when they want to convert OST to PST after their exchange server is no longer available or some other critical issue with exchange server or impor…
Check out the latest tech news, community articles, and expert highlights in August's newsletter.
Do you want to know how to make a graph with Microsoft Access? First, create a query with the data for the chart. Then make a blank form and add a chart control. This video also shows how to change what data is displayed on the graph as well as form…
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…
Suggested Courses

777 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question