修改数据库表出错 高手看下哦

[zl4460072]

代码如下
try
{
sql="update student set age='"+Age+"',cla='"+Cla+"' where stuName='"+Name+"'";
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/management","root","4460072");
stm=conn.createStatement();
rs=stm.executeQuery(sql);
if(rs.next())
{
JOptionPane.showMessageDialog(null, "修改成功！");
}
}
catch(SQLException ee)
{
System.out.println("连接数据库出错！");
}
提示的错误是 连接数据库出错
哪个地方写的不对阿？

[zilong4460072]

try
{
Class.forName("com.mysql.jdbc.Driver");
}
catch(ClassNotFoundException ee)
{
System.out.println("加载数据库驱动程序出错！");
}
try
{
conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/management","root","4460072");
stm=conn.createStatement();
rs=stm.executeUpdate(sql);
if(rs>0)
{
JOptionPane.showMessageDialog(null, "修改成功！");
}
}
catch(SQLException ee)
{
System.out.println("连接数据库出错！");
}
finally
{
if(stm!=null)
{
try
{
stm.close();
}
catch(SQLException ee)
{
ee.printStackTrace();
}
}
if(conn!=null)
{
try
{
conn.close();
}
catch(SQLException ee)
{
ee.printStackTrace();
}
}
}
}
}