Example: Using JDBCPopulate to create and populate a table

//////////////////////////////////////////////////////////////////////////////////
//
// JDBCPopulate example.  This program uses the IBM Toolbox for Java JDBC driver to
// create and populate a table.
//
// Command syntax:
//    JDBCPopulate system collectionName tableName
//
// For example,
//    JDBCPopulate MySystem MyLibrary MyTable
//
//////////////////////////////////////////////////////////////////////////////////

import java.sql.*;

public class JDBCPopulate
{



    // Strings to be added in the WORD column of the table.
    private static final String words[]
        = { "One",      "Two",      "Three",    "Four",     "Five",
            "Six",      "Seven",    "Eight",    "Nine",     "Ten",
            "Eleven",   "Twelve",   "Thirteen", "Fourteen", "Fifteen",
            "Sixteen",  "Seventeen","Eighteen", "Nineteen", "Twenty" };



    public static void main (String[] parameters)
    {
        // Check the input parameters.
        if (parameters.length != 3) {
            System.out.println("");
            System.out.println("Usage:");
            System.out.println("");
            System.out.println("   JDBCPopulate system collectionName tableName");
            System.out.println("");
            System.out.println("");
            System.out.println("For example:");
            System.out.println("");
            System.out.println("");
            System.out.println("   JDBCPopulate MySystem MyLibrary MyTable");
            System.out.println("");
            return;
        }

        String system           = parameters[0];
        String collectionName   = parameters[1];
        String tableName        = parameters[2];

        Connection connection   = null;

        try {

            // Load the IBM Toolbox for Java JDBC driver.
            DriverManager.registerDriver(new com.ibm.as400.access.AS400JDBCDriver());

            // Get a connection to the database.  Since we do not
            // provide a user id or password, a prompt will appear.
            //
            // Note that we provide a default schema here so
            // that we do not need to qualify the table name in
            // SQL statements.
            //
            connection = DriverManager.getConnection ("jdbc:as400://" + system + "/" + collectionName);

            // Drop the table if it already exists.
            try {
                Statement dropTable = connection.createStatement ();
                dropTable.executeUpdate ("DROP TABLE " + tableName);
            }
            catch (SQLException e) {
                // Ignore.
            }

            // Create the table.
            Statement createTable = connection.createStatement ();
            createTable.executeUpdate ("CREATE TABLE " + tableName
                + " (I INTEGER, WORD VARCHAR(20), SQUARE INTEGER, "
                + " SQUAREROOT DOUBLE)");

            // Prepare a statement for inserting rows.  Since we
            // execute this multiple times, it is best to use a
            // PreparedStatement and parameter markers.
            PreparedStatement insert = connection.prepareStatement ("INSERT INTO "
                + tableName + " (I, WORD, SQUARE, SQUAREROOT) " + " VALUES (?, ?, ?, ?)");

            // Populate the table.
            for (int i = 1; i <= words.length; ++i) {
                insert.setInt (1, i);
                insert.setString (2, words[i-1]);
                insert.setInt (3, i*i);
                insert.setDouble (4, Math.sqrt(i));
                insert.executeUpdate ();
            }

            // Output a completion message.
            System.out.println ("Table " + collectionName + "." + tableName + " has been populated.");
        }

        catch (Exception e) {
            System.out.println ();
            System.out.println ("ERROR: " + e.getMessage());
        }

        finally {

            // Clean up.
            try {
                if (connection != null)
                    connection.close ();
            }
            catch (SQLException e) {
                // Ignore.
            }
        }

        System.exit (0);
    }



}