library

README.md

@@ -1,4 +1,4 @@
-# Java DropWizard Flyway Starter
+# Java DropWizard Flyway Starter test
 
 Database Migration - Local
 ---

src/main/java/org/example/daos/TestDao.java

@@ -14,13 +14,23 @@ public List<String> testConnection() throws SQLException {
         try (Connection connection = DatabaseConnector.getConnection()) {
             Statement statement = connection.createStatement();
 
+            long start = System.currentTimeMillis();
+
             ResultSet resultSet = statement.executeQuery(
                     "SHOW DATABASES;");
+            long end = System.currentTimeMillis();
+
+            System.out.println("Total time to execute "
+                    + "query in milliseconds: " + (end - start));
 
+            System.out.println("Retrieving database names");
+            System.out.println("Hello world");
             while (resultSet.next()) {
+                System.out.println(resultSet.getString("Database"));
                 databases.add(resultSet.getString("Database"));
             }
         }
+        System.out.println("Finished retrieving database names");
 
         return databases;
     }

src/main/resources/db/migration/V3__library.sql

@@ -0,0 +1,202 @@
+CREATE TABLE Books (
+   id INT AUTO_INCREMENT PRIMARY KEY,
+   title VARCHAR(255) NOT NULL,
+   author VARCHAR(255) NOT NULL,
+   publisher VARCHAR(255) NOT NULL,
+   isbn VARCHAR(255) NOT NULL,
+   publication_year YEAR NOT NULL,
+   genre VARCHAR(255) NOT NULL,
+   available TINYINT(1) NOT NULL DEFAULT 1,
+   price DECIMAL(10,2) NOT NULL
+    );
+
+INSERT INTO Books (title, author, publisher, isbn, publication_year, genre, available, price)
+VALUES
+('1984', 'George Orwell', 'Secker & Warburg', '9780451524935', 1949, 'Dystopian', 1, 9.99),
+('The Hobbit', 'J.R.R. Tolkien', 'George Allen & Unwin', '9780261102217', 1937, 'Fantasy', 1, 12.50),
+('To Kill a Mockingbird', 'Harper Lee', 'J.B. Lippincott & Co.', '9780061120084', 1960, 'Classic', 1, 8.99),
+('The Martian', 'Andy Weir', 'Crown Publishing', '9780804139021', 2011, 'Science Fiction', 1, 10.99),
+('Atomic Habits', 'James Clear', 'Avery', '9780735211292', 2018, 'Self-help', 1, 16.20);
+
+
+CREATE TABLE Members (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    first_name VARCHAR(255) NOT NULL,
+    last_name VARCHAR(255) NOT NULL,
+    address VARCHAR(255) NOT NULL,
+    phone VARCHAR(255) NOT NULL,
+    email VARCHAR(255) NOT NULL,
+    register_date DATE NOT NULL
+    );
+
+INSERT INTO Members (first_name, last_name, address, phone, email, register_date)
+VALUES
+('Alice', 'Johnson', '123 Maple Street, Belfast', '07700 123456', 'alice.johnson@example.com', '2025-06-01'),
+('Ben', 'Lee', '456 Oak Road, Derry', '07700 654321', 'ben.lee@example.com', '2025-06-02'),
+('Carla', 'Nguyen', '789 Birch Ave, Armagh', '07700 112233', 'carla.nguyen@example.com', '2025-06-03'),
+('David', 'Patel', '321 Cedar St, Lisburn', '07700 334455', 'david.patel@example.com', '2025-06-04'),
+('Ella', 'OBrien', '159 Willow Lane, Newry', '07700 778899', 'ella.obrien@example.com', '2025-06-05');
+
+CREATE TABLE Loans (
+    id INT AUTO_INCREMENT PRIMARY KEY,
+    member_id INT NOT NULL,
+    book_id INT NOT NULL,
+    loan_date DATE NOT NULL,
+    return_date DATE,
+    FOREIGN KEY (member_id) REFERENCES Members(id),
+    FOREIGN KEY (book_id) REFERENCES Books(id)
+);
+
+INSERT INTO Loans (member_id, book_id, loan_date, return_date)
+VALUES
+(1, 1, '2025-06-06', NULL),
+(2, 2, '2025-06-07', '2025-06-14'),
+(3, 3, '2025-06-08', NULL),
+(4, 4, '2025-06-09', NULL),
+(5, 5, '2025-06-10', '2025-06-17');
+
+SELECT
+    m.id AS member_id,
+    CONCAT(m.first_name, ' ', m.last_name) AS member_name,
+    GROUP_CONCAT(b.title ORDER BY b.title SEPARATOR ', ') AS borrowed_books
+FROM
+    Loans l
+JOIN
+    Members m ON l.member_id = m.id
+JOIN
+    Books b ON l.book_id = b.id
+GROUP BY
+    m.id, m.first_name, m.last_name;
+
+
+SELECT
+    m.id AS member_id,
+    CONCAT(m.first_name, ' ', m.last_name) AS member_name,
+    GROUP_CONCAT(b.title ORDER BY b.title SEPARATOR ', ') AS currently_borrowed_books
+FROM
+    Loans l
+JOIN
+    Members m ON l.member_id = m.id
+JOIN
+    Books b ON l.book_id = b.id
+WHERE
+    l.return_date IS NULL
+GROUP BY
+    m.id, m.first_name, m.last_name;
+
+
+SELECT
+    b.publisher,
+    COUNT(*) AS total_loans
+FROM
+    Loans l
+JOIN
+    Books b ON l.book_id = b.id
+WHERE
+    YEAR(l.loan_date) = YEAR(CURDATE())
+GROUP BY
+    b.publisher
+ORDER BY
+    total_loans DESC
+LIMIT 1;
+
+
+SELECT
+    b.author,
+    COUNT(*) AS total_loans
+FROM
+    Loans l
+JOIN
+    Books b ON l.book_id = b.id
+WHERE
+    YEAR(l.loan_date) = YEAR(CURDATE())
+GROUP BY
+    b.author
+ORDER BY
+    total_loans ASC
+LIMIT 1;
+
+
+SELECT
+    title,
+    CASE
+        WHEN available = 1 THEN 'Available'
+        ELSE 'Unavailable'
+    END AS availability_status
+FROM
+    Books;
+
+
+SELECT
+    genre,
+    COUNT(*) AS book_count
+FROM
+    Books
+GROUP BY
+    genre
+ORDER BY
+    book_count DESC;
+
+
+
+SELECT
+    b.title AS name,
+    'Book' AS type
+FROM
+    Books b
+LEFT JOIN
+    Loans l ON b.id = l.book_id
+WHERE
+    l.id IS NULL
+
+UNION
+
+
+SELECT
+    CONCAT(m.first_name, ' ', m.last_name) AS name,
+    'Member' AS type
+FROM
+    Members m
+LEFT JOIN
+    Loans l ON m.id = l.member_id
+WHERE
+    l.id IS NULL;
+
+
+
+SELECT
+    AVG(b.price) AS average_price
+FROM
+    Books b
+JOIN
+    Loans l ON b.id = l.book_id
+WHERE
+    b.publication_year = YEAR(CURDATE()) - 1;
+
+
+UPDATE Books
+SET price = price * 0.8
+WHERE publication_year < YEAR(CURDATE()) - 5;
+
+
+UPDATE Members
+SET first_name = UPPER(first_name);
+
+UPDATE Members
+SET first_name = CONCAT(UPPER(LEFT(first_name, 1)), LOWER(SUBSTRING(first_name, 2)));
+
+
+
+DELETE FROM Loans
+WHERE return_date IS NOT NULL
+  AND return_date < CURDATE() - INTERVAL 1 MONTH;
+
+
+
+CREATE INDEX idx_author ON Books(author);
+CREATE INDEX idx_publisher ON Books(publisher);
+
+
+CREATE UNIQUE INDEX idx_email_unique ON Members(email);
+
+