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1 | public class Book { | |
2 | ||
3 | final String name; | |
4 | final String isbn; | |
5 | final String authorName; | |
6 | ||
7 | public Book(String name, String isbn, String authorName) { | |
8 | this.name = name; | |
9 | this.isbn = isbn; | |
10 | this.authorName = authorName; | |
11 | } | |
12 | ||
13 | @Override | |
14 | public String toString() { | |
15 | return String.format("%s by %s (ISBN: %s)", name, authorName, isbn); | |
16 | } | |
17 | } | |
18 | ||
19 | ||
20 | /** | |
21 | * An abstraction for the database operations | |
22 | * Provides a simpler interface for interacting with data | |
23 | */ | |
24 | public class BooksRepository { | |
25 | ||
26 | // You will need something like below to connect to an Oracle database | |
27 | // private static final String CONNECTION_URL = "jdbc:oracle:thin:localhost:1521/"; | |
28 | // private static final String DB_USER = "abhijeet"; | |
29 | //private static final String DB_PASSWORD = "something"; | |
30 | ||
31 | // Here I am using an SQLite database for demonstration | |
32 | // shouldn't make much difference except for query syntax and data types. | |
33 | private static final String CONNECTION_URL = "jdbc:sqlite:books.db"; | |
34 | ||
35 | private final Connection connection; | |
36 | ||
37 | public BooksRepository() throws SQLException { | |
38 | this.connection = DriverManager.getConnection(CONNECTION_URL); | |
39 | } | |
40 | ||
41 | public void insertBook(Book book) throws SQLException { | |
42 | final PreparedStatement statement = | |
43 | connection.prepareStatement("INSERT INTO Books(name, authorName, isbn) values(?, ?, ?)"); | |
44 | ||
45 | statement.setString(1, book.name); | |
46 | statement.setString(2, book.authorName); | |
47 | statement.setString(3, book.isbn); | |
48 | ||
49 | statement.executeUpdate(); | |
50 | } | |
51 | ||
52 | /** | |
53 | * Fetches all books from the database | |
54 | */ | |
55 | public List<Book> getAllBooks() throws SQLException { | |
56 | final Statement statement = connection.createStatement(); | |
57 | final ResultSet result = statement.executeQuery("SELECT * FROM Books"); | |
58 | ||
59 | final ArrayList<Book> books = new ArrayList<Book>(); | |
60 | ||
61 | while (result.next()) { | |
62 | final String name = result.getString("name"); | |
63 | final String isbn = result.getString("isbn"); | |
64 | final String authorName = result.getString("authorName"); | |
65 | ||
66 | books.add(new Book(name, isbn, authorName)); | |
67 | } | |
68 | ||
69 | return books; | |
70 | } | |
71 | ||
72 | /** | |
73 | * Fetches a book with specific ISBN | |
74 | * if no such book exists, null is returned | |
75 | */ | |
76 | public Book getBookByIsbn(String matchIsbn) throws SQLException { | |
77 | final PreparedStatement statement = connection.prepareStatement("SELECT * FROM BOOKS WHERE isbn = ?"); | |
78 | ||
79 | statement.setString(1, matchIsbn); | |
80 | final ResultSet result = statement.executeQuery(); | |
81 | ||
82 | if (result.next()) { | |
83 | final String name = result.getString("name"); | |
84 | final String isbn = result.getString("isbn"); | |
85 | final String authorName = result.getString("authorName"); | |
86 | ||
87 | return new Book(name, isbn, authorName); | |
88 | } else { | |
89 | return null; | |
90 | } | |
91 | } | |
92 | ||
93 | /** | |
94 | * Fetches all the books with the name that match a given string | |
95 | */ | |
96 | public List<Book> getBooksByName(String matchName) throws SQLException { | |
97 | final PreparedStatement statement = connection.prepareStatement("SELECT * FROM Books WHERE name LIKE ?"); | |
98 | ||
99 | statement.setString(1, '%' + matchName + '%'); | |
100 | final ResultSet result = statement.executeQuery(); | |
101 | ||
102 | final ArrayList<Book> books = new ArrayList<Book>(); | |
103 | ||
104 | while (result.next()) { | |
105 | final String name = result.getString("name"); | |
106 | final String isbn = result.getString("isbn"); | |
107 | final String authorName = result.getString("authorName"); | |
108 | ||
109 | books.add(new Book(name, isbn, authorName)); | |
110 | } | |
111 | ||
112 | return books; | |
113 | } | |
114 | ||
115 | public void close() throws SQLException { | |
116 | if (!this.connection.isClosed()) { | |
117 | this.connection.close(); | |
118 | } | |
119 | } | |
120 | } | |
121 | ||
122 | ||
123 | public class Main { | |
124 | ||
125 | private static Book inputBook() { | |
126 | System.out.println("Enter book name, author and isbn on separate lines:"); | |
127 | String name = Stdin.readLine(); | |
128 | String authorName = Stdin.readLine(); | |
129 | String isbn = Stdin.readLine(); | |
130 | ||
131 | return new Book(name, authorName, isbn); | |
132 | } | |
133 | ||
134 | public static void main(String[] args) throws SQLException { | |
135 | ||
136 | final BooksRepository repo = new BooksRepository(); | |
137 | ||
138 | // Add a new book to database | |
139 | final Book newBook = inputBook(); | |
140 | repo.insertBook(newBook); | |
141 | ||
142 | // List out all books | |
143 | System.out.println("All books:"); | |
144 | ||
145 | final List<Book> allBooks = repo.getAllBooks(); | |
146 | for (final Book book : allBooks) { | |
147 | System.out.println(book); | |
148 | } | |
149 | ||
150 | // Search for books | |
151 | System.out.println("Books with search term:"); | |
152 | ||
153 | final List<Book> booksWithSInName = repo.getBooksByName("s"); | |
154 | for (final Book book : booksWithSInName) { | |
155 | System.out.println(book); | |
156 | } | |
157 | ||
158 | // Look up a specific book | |
159 | System.out.println("Book with specific ISBN:"); | |
160 | ||
161 | final Book myBook = repo.getBookByIsbn("123"); | |
162 | System.out.println(myBook); | |
163 | ||
164 | // Close out repository after we are done with it | |
165 | repo.close(); | |
166 | } | |
167 | } |