Informix JDBC Driver Programmer's Guide Appendix A: Sample Code

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/***************************************************************************
 *
 *  Title:         MultiRowCall.java
 *
 *  Description:    Demo a procedure call with multiple return rows
 *		
 *  An example of running the program: 
 *		
 *   java MultiRowCall 
 *      'jdbc:informix-
sqli://emily:1533:informixserver=emily3;user=rdtest;password=test'
 *   Expected result:
 * 
 * >>>Multiple Return Row Procedure Call Statement test.
 * URL = "jdbc:informix-
sqli://emily:1533/testDB:informixserver=emily3;user=rdtest;password=test"
 * Execute procedure proc2() returns: 1
 * Execute procedure proc2() returns: 2
 * Execute procedure proc2() returns: 3
 * Execute procedure proc2() returns: 4
 * Execute procedure proc2() returns: 5
 * >>>End of Multiple Return Row Procedure Call Statement test.
 * 
 ***************************************************************************
 */

import java.sql.*;
import java.util.*;

public class MultiRowCall {

    public static void main(String[] args)
    {
        if (args.length == 0)
	    {
	    System.out.println("ERROR: connection URL must be provided in order to run 
the demo!");
	    return;
	    }

        String url = args[0];
        StringTokenizer st = new StringTokenizer(url, ":");
        String token;
        String newUrl = "";

        for (int i = 0; i < 4; ++i)
	    { 
            if (!st.hasMoreTokens())
   	        {
	        System.out.println("ERROR: incorrect URL format!");
	        return;
	        }
            token = st.nextToken();
            if (newUrl != "")
	        newUrl += ":";
            newUrl += token;
            }

        newUrl += "/testDB";

        while (st.hasMoreTokens())
	    { 
            newUrl += ":" + st.nextToken();
            }

	String cmd = null;
	int rc;

        String testName = "Multiple Return Row Procedure Call Statement";

	Connection conn = null;

	String proc2 = "create procedure proc2( i integer ) " +
        "returning integer ; " +
        "  define j integer ; " +
        "  for j in ( 1 to 5 ) " +
        "    let i = i + 1 ; " +
        "    return i with resume ; " +
        "  end for " +
        "end procedure";

	System.out.println(">>>" + testName + " test.");
	System.out.println("URL = \"" + newUrl + "\"");

	try 
	    {
	    Class.forName("com.informix.jdbc.IfxDriver");
	    } 
	catch (Exception e)
	    {
	    System.out.println("ERROR: failed to load Informix JDBC driver.");
	    }

	try 
	    {
	    conn = DriverManager.getConnection(newUrl);
	    } 
	catch (SQLException e) 
	    {
	    System.out.println("ERROR: failed to connect!");
	    }

	try
	    {
	    Statement stmt = conn.createStatement();
	    rc = stmt.executeUpdate(proc2);
	    stmt.close();
	    }
	catch (SQLException e)
	    {
	    System.out.println("ERROR: execution failed - statement: " + proc2);
	    System.out.println("ERROR: " + e.getMessage());
	    }


        try
            {
            PreparedStatement pstmt = conn.prepareStatement("{call proc2(0)};");
            ResultSet r = pstmt.executeQuery();
 
            while (r.next())
                {
                short i = r.getShort(1);
                System.out.println("Execute procedure proc2() returns: " + i);
                }
	    r.close();
	    pstmt.close();
            }
        catch (SQLException e)
            {
            System.out.println("ERROR: Prepare \"call proc2\" failed: " + 
e.getErrorCode());
            }

	try
	    {
	    Statement stmt = conn.createStatement();
	    cmd = "drop procedure proc2";
	    rc = stmt.executeUpdate(cmd);
	    stmt.close();
	    }
	catch (SQLException e)
	    {
	    System.out.println("ERROR: execution failed - statement: " + cmd);
	    System.out.println("ERROR: " + e.getMessage());
	    }

	try 
	    {
            conn.close();
	    } 
	catch (SQLException e) 
	    {
	    System.out.println("ERROR: failed to close the connection!");
	    }

	System.out.println(">>>End of " + testName + " test.");
    }
}