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‎Chapter16/Example1/Customer.java‎

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// Customer class for Chapter 16 example 1 ready for three tiers
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// Identical to Customer class in Chapter 14
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import java.util.Vector;
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public class Customer
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{
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// attribute definitions
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private String name;
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private String address;
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private String phoneNo;
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// constructor with parameters
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public Customer(String aName, String anAddress, String aPhoneNo)
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{
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// invoke accessors to populate attributes
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setName(aName);
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setAddress(anAddress);
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setPhoneNo(aPhoneNo);
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}
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// DA static methods *********************************
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public static void initialize()
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{CustomerDA.initialize();}
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public static Customer find(String phoneNo)
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throws NotFoundException
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{return CustomerDA.find(phoneNo);}
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public static Vector getAll()
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{return CustomerDA.getAll();}
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public static void terminate()
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{CustomerDA.terminate();}
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// DA instance methods *******************************
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public void addNew() throws DuplicateException
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{CustomerDA.addNew(this);}
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public void delete() throws NotFoundException
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{CustomerDA.delete(this);}
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public void update() throws NotFoundException
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{CustomerDA.update(this);}
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// get accessors
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public String getName()
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{ return name;}
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public String getAddress()
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{ return address;}
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public String getPhoneNo()
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{ return phoneNo;}
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// set accessors
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public void setName(String newName)
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{ name = newName;}
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public void setAddress(String newAddress)
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{ address = newAddress;}
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public void setPhoneNo(String newPhoneNo)
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{ phoneNo = newPhoneNo;}
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public String tellAboutSelf()
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{
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return (getName() + ", " + getAddress() + ", "
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+ getPhoneNo());
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}
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}

‎Chapter16/Example1/CustomerDA.java‎

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// CustomerDA for Chapter 16 Example 1 -
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// Same as Chapter 14 Example 4
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import java.util.Vector; // for Vector of customers
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import java.io.*; // needed for file i/o
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import java.sql.*; // for SQL
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public class CustomerDA
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{
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static Customer aCustomer;
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// The Data Source name is "Chapter16CustomerDatabase"
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static String url = "jdbc:odbc:Chapter16CustomerDatabase";
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static Connection aConnection;
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static Statement aStatement;
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// declare variables for Customer attribute values
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static String name;
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static String address;
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static String phoneNumber;
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// Implement the four static methods in Customer ************
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// initialize, find, getAll, and terminate
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// establish the database connection
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public static void initialize()
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{
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try
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{
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// load the jdbc - odbc bridge driver for Windows
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Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
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// create connection instance
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aConnection = DriverManager.getConnection(url, "", "");
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// create statement object instance for this connection
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aStatement = aConnection.createStatement();
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}
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catch (ClassNotFoundException e)
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{System.out.println(e);}
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catch (SQLException e)
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{ System.out.println(e); }
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}
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// find an instance in the database
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public static Customer find(String key) throws NotFoundException
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{
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aCustomer = null;
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// define the SQL query statement using the phone number key
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String sqlQuery = "SELECT Name, Address, PhoneNo " +
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"FROM CustomerTable " +
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"WHERE PhoneNo = '" + key +"'";
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// execute the SQL query statement
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try
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{
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ResultSet rs = aStatement.executeQuery(sqlQuery);
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// next method sets cursor & returns true if there is data
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boolean gotIt = rs.next();
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if (gotIt)
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{
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// extract the data
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String name = rs.getString(1);
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String address = rs.getString(2);
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String phoneNumber = rs.getString(3);
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// create Customer instance
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aCustomer = new Customer(name, address, phoneNumber);
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}
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else
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{
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// nothing was retrieved
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throw (new NotFoundException("not found "));
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}
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rs.close();
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}
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catch (SQLException e)
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{ System.out.println(e);}
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return aCustomer;
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}
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// get all instances from the database
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public static Vector getAll()
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{
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Vector customers = new Vector();
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// define the SQL query statement for get all
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String sqlQuery = "SELECT Name, Address, PhoneNo " +
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"FROM CustomerTable ";
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try
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{
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// execute the SQL query statement
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ResultSet rs = aStatement.executeQuery(sqlQuery);
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boolean moreData = rs.next();
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if (moreData)
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// next method sets cursor & returns true if there is data
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while (moreData)
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{
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// extract the data
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name = rs.getString(1);
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address = rs.getString(2);
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phoneNumber = rs.getString(3);
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// create Customer instance
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aCustomer = new Customer(name, address, phoneNumber);
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customers.addElement(aCustomer);
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moreData = rs.next();
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}
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rs.close();
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}
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catch (SQLException e)
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{ System.out.println(e);}
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return customers;
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}
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// close the database connection
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public static void terminate()
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{
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try
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{ // close everything
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aStatement.close();
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aConnection.close();
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}
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catch (SQLException e)
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{ System.out.println(e); }
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}
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// Implement the three instance methods in Customer *************
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// addNew, delete, update
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// add new instance to database
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public static void addNew(Customer aCustomer)
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throws DuplicateException
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{
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// retrieve the customer attribute values
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name = aCustomer.getName();
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address = aCustomer.getAddress();
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phoneNumber = aCustomer.getPhoneNo();
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// create the SQL insert statement using attribute values
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String sqlInsert = "INSERT INTO CustomerTable " +
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"(Name, Address, PhoneNo)" +
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" VALUES ('" +
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name + "', '" +
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address + "', '" +
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phoneNumber + "')";
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// see if this customer already exists in the database
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try
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{
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Customer c = find(phoneNumber);
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throw (new DuplicateException("Customer Exists "));
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}
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// if NotFoundException, add customer to database
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catch(NotFoundException e)
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{
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try
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{
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// execute the SQL update statement, a 1 return good
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int result = aStatement.executeUpdate(sqlInsert);
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}
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catch (SQLException ee)
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{ System.out.println(ee); }
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}
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}
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// delete an instance from the database
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public static void delete(Customer aCustomer)
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throws NotFoundException
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{
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// retrieve the phone no (key)
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phoneNumber = aCustomer.getPhoneNo();
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// create the SQL delete statement
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String sqlDelete = "DELETE FROM CustomerTable " +
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"WHERE PhoneNo = '" + phoneNumber +"'";
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// see if this customer already exists in the database
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// NotFoundException is thrown by find method
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try
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{
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Customer c = Customer.find(phoneNumber);
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// if found, execute the SQL update statement, a 1 return
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// is good delete
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int result = aStatement.executeUpdate(sqlDelete);
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}
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catch (SQLException e)
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{ System.out.println(e); }
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}
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// update instance in the database
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public static void update(Customer aCustomer) throws
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NotFoundException
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{
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// retrieve the customer attribute values
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phoneNumber = aCustomer.getPhoneNo();
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name = aCustomer.getName();
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address = aCustomer.getAddress();
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// define the SQL query statement using the phone number key
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String sqlUpdate = "UPDATE CustomerTable " +
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" SET Name = '" + name +"', " +
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" Address = '" + address +"' " +
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" WHERE PhoneNo = '" + phoneNumber +"'";
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// see if this customer already exists in the database
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// NotFoundException is thrown by find method
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try
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{
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Customer c = Customer.find(phoneNumber);
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// if found, execute the SQL update statement, a 1 return
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// is good delete
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int result = aStatement.executeUpdate(sqlUpdate);
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}
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catch (SQLException ee)
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{ System.out.println(ee); }
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}
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}
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‎Chapter16/Example1/Customers.mdb‎

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‎Chapter16/Example1/DuplicateException.java‎

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public class DuplicateException extends Exception
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{
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public DuplicateException(String message)
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{ super(message);}
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}

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