//*********************************************************************
//
//                 Copyright (c) 2006-2008 by Teradata Corporation
//                         All Rights Reserved
//
//*********************************************************************
//
//  File:       T20003JD.java
//  Header:     none
//  Purpose:    Demonstrate how to set up global temporary table, which is
//              required for lob updates. Used by T20404 to update lob.
//              The program will:
//                -  Connect as user guest/please
//                -  Drop global temporary table JdbcLobUpdate if it exists
//                -  Create global temporary table JdbcLobUpdate with the
//                   following columns:
//                   id INTEGER NOT NULL,
//                   bval BLOB,
//                   cval CLOB CHARACTER SET UNICODE
//                -  Disconnect.
//
//  JDBC API: java.sql.Connection, java.sql.Statement,
//            java.sql.Statement.executeUpdate
//
//  Version: Updated for Teradata 12
//
//*********************************************************************

import java.sql.*;

public class T20003JD
{
    // Name of the user able to create, drop, and manipulate tables
    public static String sUser = "guest";
    public static String sPassword = "please";

    public static void main(String args[])
    throws ClassNotFoundException
    {
        // Creation of URL to be passed to the JDBC driver
        String url = "jdbc:teradata://whomooz/TMODE=ANSI,CHARSET=UTF8";

        // Statements used in table creation
        String sDropTbl = "DROP TABLE JdbcLobUpdate";
        String sCreateTbl =
            " CREATE GLOBAL TEMPORARY TABLE JdbcLobUpdate("+
            "   id INTEGER NOT NULL,"+
            "   bval BLOB,"+
            "   cval CLOB CHARACTER SET UNICODE)"+
            " UNIQUE PRIMARY INDEX upi_JdbcLobUpdate(id)"+
            " ON COMMIT PRESERVE ROWS";

        try
        {
            System.out.println("\n Sample T20003JD: \n");
            System.out.println(" Looking for the Teradata JDBC driver... ");
            // Loading the Teradata JDBC driver
            Class.forName("com.teradata.jdbc.TeraDriver");
            System.out.println(" JDBC driver loaded. \n");

            // Attempting to connect to Teradata
            System.out.println(" Attempting to connect to Teradata via" +
                               " the JDBC driver...");

            // Creating a connection object
            Connection con = DriverManager.getConnection(url, sUser, sPassword);
            System.out.println(" User " + sUser + " connected.");
            System.out.println(" Connection to Teradata established. \n");

            try
            {
                // Creating a statement object from an active connection.
                Statement stmt = con.createStatement();
                System.out.println(" Statement object created. \n");

                try
                {
                    // Cleanup procedure:
                    // If the sample table already exists, drop it.
                    try
                    {
                        System.out.println(" Dropping table if present: "
                                           + sDropTbl);
                        stmt.executeUpdate(sDropTbl);
                        System.out.println(" Table dropped.\n");
                    }
                    catch (SQLException ex)
                    {
                        // If the table did not exist, no drop is required.
                        // Ignore the raised "no table present" exception by
                        // printing out the error message and swallowing the
                        // exception.
                        System.out.println(" Drop table exception ignored: "
                                           + ex);
                        System.out.println(" Table could not be dropped." +
                                           " Execution will continue...\n");
                    }

                    // Create the global temporary table
                    System.out.println(" Creating table: " + sCreateTbl);
                    stmt.executeUpdate(sCreateTbl);
                    System.out.println(" Sample table created. \n");
                }
                finally
                {
                    // Close the statement
                    stmt.close();
                    System.out.println("\n Statement object closed. \n");
                }
            }
            finally
            {
                // Close the connection
                System.out.println(" Closing connection to Teradata...");
                con.close();
                System.out.println(" Connection to Teradata closed. \n");
            }

            System.out.println(" Sample T20003JD finished. \n");
        }
        catch (SQLException ex)
        {
            // A SQLException was generated.  Catch it and display
            // the error information.
            // Note that there could be multiple error objects chained
            // together.
            System.out.println();
            System.out.println("*** SQLException caught ***");

            while (ex != null)
            {
                System.out.println(" Error code: " + ex.getErrorCode());
                System.out.println(" SQL State: " + ex.getSQLState());
                System.out.println(" Message: " + ex.getMessage());
                ex.printStackTrace();
                System.out.println();
                ex = ex.getNextException();
            }

            throw new IllegalStateException ("Sample failed.") ;
        }
    } // End main
} // End class T20003JD