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| 1 | public class Book {
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| 2 | ||
| 3 | final String name; | |
| 4 | final String isbn; | |
| 5 | final String authorName; | |
| 6 | ||
| 7 | public Book(String name, String isbn, String authorName) {
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| 8 | this.name = name; | |
| 9 | this.isbn = isbn; | |
| 10 | this.authorName = authorName; | |
| 11 | } | |
| 12 | ||
| 13 | @Override | |
| 14 | public String toString() {
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| 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 {
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| 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 {
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| 42 | final PreparedStatement statement = | |
| 43 | connection.prepareStatement("INSERT INTO Books(name, authorName, isbn) values(?, ?, ?)");
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| 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 {
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| 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");
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| 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 = ?");
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| 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");
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| 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 | } |