processing-MySQL learning4-call procedure:call proce(parameters)

import de.bezier.data.sql.*;
//import de.bezier.data.sql.mapper.*;

MySQL mysql;

void setup()
{
size(100,100);

String database="mydatas";
String user="hui1570";
String pass="04263028";
mysql=new MySQL(this,"localhost",database,user,pass);

if(mysql.connect())
{
//call a procedure: proce(parameters) is a procedure but not a function !!!!!!
mysql.query("call proce(3)");

while(mysql.next())
{
String u=mysql.getString("username");
println(u);
}
}
}