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Valli
Applet Error
2 Answer(s)      4 years and 6 months ago
Posted in : Applet


Hi...

I had an application where i designed an applet to get the database values into the applet when i clicked a line...
It works fine when i implemented this in the local system
but when it is in server..
then i'm unable to get the values from the local system...
Null values are returning when i'm accessing the server from my local system

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May 12, 2010 at 4:12 PM


Hi Friend,

Please post your code.

Thanks


May 12, 2010 at 4:38 PM


[code]
public class circuit extends Applet implements MouseListener{
boolean rect1Clicked,rect1Clicked1,mouseEntered;
RTextLine text = new RTextLine();
Connection con=null;
Statement stmt,stmt1,stmt3;
ResultSet rs,rs2;
String str1,str2,str3,str4,s1,str5,str6;

public void init(){

setBackground(Color.black);
addMouseListener(this);
text.setDrawingComponent(this);

try{

Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb","username","password";);
stmt=con.createStatement();
stmt1=con.createStatement();
stmt3=con.createStatement();



}
catch(Exception e){
e.printStackTrace();
}



}

public void mouseClicked (MouseEvent me) {

int xpos= me.getX();
int ypos= me.getY();


if(xpos>=25 && xpos<=35 && ypos>=540 && ypos<=645)
{
s1="Feeder";
rect1Clicked=true;

}
else
rect1Clicked = false;
res(s1);
repaint();
}
public void paint(Graphics g) {
....Some Painting Lines Code Here....
if (rect1Clicked)
{

g.setColor(Color.red);
g.drawString("("+str1+", ",80,690);
...Some Painting Lines Code Here...
}
public void res(String s) {
try{
str1=null;;
String mid=null;

ResultSet rs3=stmt3.executeQuery("select mid from table1 where lname='"+s+"';");
if(rs3.next()){

mid=rs3.getString("mid");

}
ResultSet rs = stmt1.executeQuery("select Frequency,RPhaseVoltage,ActivePower from mydb.instantaneousdata where meterid='"+meterid+"';");
rs2 = stmt.executeQuery("SELECT ActiveExportTotal,StartDate,StartTime FROM mydb.energysnapshotdata where mid='"+mid+"';");

while(rs.next()){
str1 = rs.getString("Frequency");
str2 = rs.getString("RPhaseVoltage");
str3= rs.getString("ActivePower");


}
while(rs2.next())
{
str4=rs2.getString("ActiveExportTotal");
str5= rs2.getString("StartDate");
str6= rs2.getString("StartTime");
}

}
catch(Exception e){


}
}
}
[/code]


This is my code....

There r some code left which i didn't included in the above code...as it is a very large code which isn't necessary for finding the error...
as itz only drawing strings or lines


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