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// =========================================== // Customer methods // =========================================== /** * Returns the customer object corresponding to * the current customer ID * @exception SQLException if a database error occurs */ public Customer getCustomer() throws SQLException { // Verify that a connection exists if (!isConnected()) throw new SQLException("No connection"); // Verify that there is a current customer ID if (customerID == null) throw new SQLException("No customer ID"); PreparedStatement pstmt = null; ResultSet rs = null; Customer customer = null; try { // Prepare the query SQL pstmt = conprepareStatement ("select * from customers where customerID = "); pstmtsetString(1, customerID); // Execute the query rs = pstmtexecuteQuery(); if (rsnext())

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customer = Customerload(rs); } finally { if (rs != null) rsclose(); if (pstmt != null) pstmtclose(); } // Return the customer return customer; } /** * Returns the current customer search results */ public List getCustomers() { return customers; } /** * Uses the specified customer search argument to query * the database for matching customers Creates a list * of customer objects * @param searchArgument the search argument * @exception SQLException if a database error occurs */ public void customerSearch(String searchArgument) throws SQLException { // Verify that a connection exists and that // the search argument has been specified if (!isConnected()) throw new SQLException("No connection"); PreparedStatement pstmt = null; ResultSet rs = null; customers = null;

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try { // Prepare the query SQL pstmt = conprepareStatement( "select *" + " from customers" + " where name like " + " order by name" ); searchArgument = searchArgumenttrim(); searchArgument = "%" + searchArgument + "%"; pstmtsetString(1, searchArgument); // Execute the query and copy the results // to a List rs = pstmtexecuteQuery(); customers = new LinkedList(); while (rsnext()) { customersadd(Customerload(rs)); } } finally { if (rs != null) rsclose(); if (pstmt != null) pstmtclose(); } } /** * Returns the customerID */ public String getCustomerID() { return customerID; } /** * Sets the customerID * @param customerID the customerID

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*/ public void setCustomerID(String customerID) { thiscustomerID = customerID; }

There are get and set methods for the current customer ID, and a method for retrieving from the database the Customer object having that ID The getCustomer() method illustrates the function of the Customerload() method in extracting a Customer object from a result set The customerSearch() method selects Customer objects from the customer table whose name field matches a specified search argument The resulting javautilList is stored as an instance variable and can be retrieved with getCustomers()

Figure 5-28

// =========================================== // Product methods // =========================================== JSP IN ACTION /** * Returns the product object corresponding to * the current product ID * @exception SQLException if a database error occurs */ public Product getProduct() throws SQLException { // Verify that a connection exists if (!isConnected()) throw new SQLException("No connection"); // Verify that a current product ID exists if (productID == null) throw new SQLException("No product ID"); PreparedStatement pstmt = null; ResultSet rs = null; Product product = null; try {

// Prepare the query SQL pstmt = conprepareStatement ("select * from products where productID = "); pstmtsetString(1, productID); // Execute the query rs = pstmtexecuteQuery(); if (rsnext()) product = Productload(rs); } finally { if (rs != null) rsclose(); if (pstmt != null) pstmtclose(); } // Return the product return product; } /** * Returns the current product search results */ public List getProducts() { return products; } /** * Uses the specified product search argument to query * the database for matching products Creates a list * of product objects * @param searchArgument the search argument * @exception SQLException if a database error occurs */ public void productSearch(String searchArgument) throws SQLException {

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