Create UDRs with UDRManager

The following code creates methods in the Group1 class to be registered as UDRs in the database server:

import java.sql.*;

public class Group1
{
   public static String udr1 (String s1, String s2)
        throws SQLException
   {
   return s1 + s2;
   }
    // Return a formatted string with all inputs
   public static String udr2 (Integer i, String s1,
                  String s2) throws SQLException
   {
   return "{" + i + "," + s1 + "," + s2 +"}";
   }
}

The following code creates Java methods udr1 and udr2 as UDRs group1_udr1 and group1_udr2 in the database server and then uses the UDRs:

import java.sql.*;
import java.lang.reflect.*;

public class PlayWithGroup1
{
// Open a connection...
url = "jdbc:onedb://hostname:portnum:db;user=scott;password=tiger;
myConn = DriverManager.getConnection(url);

//Install the routines in the database.
UDRManager udtmgr = new UDRManager(myConn);
UDRMetaData mdata = new UDRMetaData();
Class gp1 = Class.forName("Group1");
Method method1 = gp1.getMethod("udr1", 
   new Class[]{String.class, String.class});
Method method2 = gp1.getMethod("udr2", 
   new Class[]{Integer.class, String.class, String.class});
mdata.setUDR(method1, "group1_udr1");
mdata.setUDR(method2, "group1_udr2");
mdata.setJarFileSQLName("group1_jar");
udtmgr.createUDRs(mdata, "Group1.jar", "Group1", 0);

// Use the UDRs in SQL statements:
Statement stmt = myConn.createStatement();
stmt.executeUpdate("create table tab (c1 varchar(10), 
   c2 char(20)", c3 int);
stmt.close();
Statement stmt = myConn.createStatement();
stmt.executeUpdate("insert into tab values ('hello', 'world',
   222)");
stmt.close();

Statement stmt = myConn.createStatement();
ResultSet r = stmt.executeQuery("select c3, group1_udr2(c3, c1, c2) 
   from tab where group1_udr1(c1, c2) = 'hello world'");

...

}