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~ refactor database into multiple files 

Signed-off-by: Johannes Theiner <j.theiner@live.de>
This commit is contained in:
Johannes Theiner 2019-05-19 14:26:45 +02:00
parent 59d944fccd
commit 07924cfbdf
14 changed files with 736 additions and 571 deletions
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1
pom.xml
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@ -147,6 +147,7 @@
</dependency>
<!--Database-->
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>

133
src/main/java/de/hsel/itech/db/AuthorDB.java Normal file
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@ -0,0 +1,133 @@
package de.hsel.itech.db;
import de.hsel.itech.db.pojo.Author;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @author Johannes Theiner
* @version 0.1
* @since 0.5
**/
public class AuthorDB {
private Database database;
AuthorDB(Database database) {
this.database = database;
}
/**
* gets tableAuthor by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Author}
*/
@Nullable
public Author get(long id) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetById(database.tableAuthor, id);
assert entry != null;
ResultSet rs = entry.getKey();
Author author = null;
try {
author = new Author(rs.getLong("id"), rs.getString("name"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return author;
}
/**
* gets tableAuthor by name.
*
* @param name tableAuthor name
* @return {@link de.hsel.itech.db.pojo.Author}
*/
@Nullable
public Author get(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetsByValue(database.tableAuthor, "name", name);
assert entry != null;
assert entry.getKey() != null;
Author author = null;
ResultSet rs = entry.getKey();
try {
if (rs.next())
author = new Author(rs.getLong("id"), rs.getString("name"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return author;
}
/**
* inserts Author.
*
* @param author Author
* @return insert count
*/
public int insert(@NotNull Author author) {
Connection connection = database.getConnection();
assert connection != null;
int insertCount = 0;
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO author (name) VALUES (?)");
statement.setString(1, author.getName());
insertCount += statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
/**
* deletes tableAuthor from database.
*
* @param id tableAuthor id
* @return deletion count
*/
public int delete(long id) {
return database.delete(id, database.tableAuthor);
}
/**
* gets list of tableAuthor ids from database.
*
* @param id tableBook id from database
* @return {@link java.util.List}
*/
@Nullable
List<Integer> getAll(long id) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetsById(database.tableAuthorBook, database.tableBook, id);
assert entry != null;
try {
List<Integer> list = new ArrayList<>();
ResultSet rs = entry.getKey();
while (rs.next()) {
list.add(rs.getInt(database.tableAuthor));
}
entry.getValue().close();
return list;
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
}

265
src/main/java/de/hsel/itech/db/BookDB.java Normal file
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@ -0,0 +1,265 @@
package de.hsel.itech.db;
import de.hsel.itech.db.pojo.Author;
import de.hsel.itech.db.pojo.Book;
import de.hsel.itech.db.pojo.Category;
import de.hsel.itech.db.pojo.Publisher;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.sql.*;
import java.time.Year;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @author Johannes Theiner
* @version 0.1
* @since 0.5
**/
public class BookDB {
private Database database;
BookDB(Database database) {
this.database = database;
}
/**
* gets tableBook by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Book}
*/
@Nullable
public Book get(long id) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetById(database.tableBook, id);
assert entry != null;
return build(entry);
}
/**
* builds tableBook from entry.
*
* @param entry Map.Entry
* @return BookDB
*/
@Nullable
private Book build(@NotNull Map.Entry<ResultSet, Connection> entry) {
Book book = null;
ResultSet rs = entry.getKey();
try {
Category category = database.category().get(rs.getLong(database.tableCategory));
Publisher publisher = database.publisher().get(rs.getLong(database.tablePublisher));
List<Integer> authorIds = database.author().getAll(rs.getLong("id"));
assert category != null;
assert publisher != null;
assert authorIds != null;
List<Author> authors = new ArrayList<>();
for (int i : authorIds) {
Author author = database.author().get(i);
assert author != null;
authors.add(author);
}
book = new Book(rs.getLong("id"), rs.getLong("isbn"), authors, publisher, category, rs.getString("title"),
Year.of(rs.getInt("year")), rs.getInt("price"), rs.getString("description"),
rs.getString("image"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return book;
}
/**
* gets all books.
*
* @return {@link java.util.List}
*/
@Nullable
public List<Book> getAll() {
List<Long> ids = database.getIds(database.tableBook);
List<Book> books = new ArrayList<>();
for (long id : ids) {
books.add(get(id));
}
return books;
}
/**
* gets books by tableCategory.
*
* @param category tableCategory id
* @return {@link java.util.List}
*/
@Nullable
public List<Book> getAll(long category) {
Connection connection = database.getConnection();
assert connection != null;
List<Book> books = new ArrayList<>();
try {
PreparedStatement statement = connection.prepareStatement("SELECT (id) FROM book WHERE category = ?");
statement.setLong(1, category);
ResultSet resultSet = statement.executeQuery();
while (resultSet.next()) {
books.add(get(resultSet.getLong("id")));
}
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
return books;
}
/**
* getAll books by tableCategory.
*
* @param category Category object
* @return {@link java.util.List}
*/
@Nullable
public List<Book> getAll(@NotNull Category category) {
return getAll(category.getId());
}
/**
* exists tableBook with isbn ?
*
* @param isbn isbn
* @return true if tableBook with isbn exists
*/
public boolean exists(long isbn) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetByValue(database.tableBook, "isbn", isbn);
try {
if (entry != null && entry.getKey() != null) {
entry.getValue().close();
return true;
}
} catch (SQLException ex) {
ex.printStackTrace();
}
return false;
}
/**
* deletes tableBook from database.
*
* @param id tableBook id
* @return deletion count
*/
public int delete(long id) {
int deleteCount = 0;
try {
Connection connection = database.getConnection();
assert connection != null;
PreparedStatement statement = connection.prepareStatement("DELETE FROM author_book WHERE book = ?");
statement.setLong(1, id);
deleteCount = +statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
deleteCount += database.delete(id, database.tableBook);
return deleteCount;
}
/**
* Inserts tableBook into database.
* authors, publishers, and tableCategory have to exist.
*
* @param book BookDB
* @return insert count
*/
public int insert(@NotNull Book book) {
Connection connection = database.getConnection();
assert connection != null;
int insertCount = 0;
//tableAuthor exists ?
List<Author> authors = new ArrayList<>();
for (Author author : book.getAuthors()) {
if (author.getId() == 0) {
Author dbAuthor = database.author().get(author.getName());
if (dbAuthor == null) {
insertCount += database.author().insert(author);
dbAuthor = database.author().get(author.getName());
}
authors.add(dbAuthor);
} else authors.add(author);
}
//tablePublisher exists ?
Publisher publisher;
if (book.getPublisher().getId() == 0) {
Publisher dbPublisher = database.publisher().get(book.getPublisher().getName());
if (dbPublisher != null)
publisher = dbPublisher;
else {
insertCount += database.publisher().insert(new Publisher(book.getPublisher().getName()));
publisher = database.publisher().get(book.getPublisher().getName());
}
} else publisher = book.getPublisher();
//tableCategory exists ?
Category category;
if (book.getCategory().getId() == 0) {
Category dbCategory = database.category().get(book.getCategory().getName());
if (dbCategory != null)
category = dbCategory;
else {
insertCount += database.category().insert(new Category(book.getCategory().getName(), database.getRandomImage()));
category = database.category().get(book.getCategory().getName());
}
} else category = book.getCategory();
assert publisher != null;
assert category != null;
//insert tableBook
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO book(isbn, title, description, " +
"price, year, publisher, category, image) VALUES (?, ?, ?, ?, ?, ?, ?, ?)", Statement.RETURN_GENERATED_KEYS);
statement.setLong(1, book.getIsbn());
statement.setString(2, book.getTitle());
statement.setString(3, book.getDescription());
statement.setInt(4, book.getPrice());
statement.setInt(5, book.getYear().getValue());
statement.setLong(6, publisher.getId());
statement.setLong(7, category.getId());
statement.setString(8, book.getImage());
insertCount += statement.executeUpdate();
ResultSet resultSet = statement.getGeneratedKeys();
long lastId = -1;
while (resultSet.next()) {
lastId = resultSet.getLong("id");
}
//add tableBook to tableAuthor
for (Author author : authors) {
PreparedStatement authorStatement = connection.prepareStatement("INSERT INTO " + database.tableAuthorBook + " (author, book) VALUES (?, ?);");
authorStatement.setLong(1, author.getId());
authorStatement.setLong(2, lastId);
insertCount += authorStatement.executeUpdate();
}
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
}

133
src/main/java/de/hsel/itech/db/CategoryDB.java Normal file
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@ -0,0 +1,133 @@
package de.hsel.itech.db;
import de.hsel.itech.db.pojo.Category;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* @author Johannes Theiner
* @version 0.1
* @since 0.5
**/
public class CategoryDB {
private Database database;
CategoryDB(Database database) {
this.database = database;
}
/**
* gets tableCategory by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Category}
*/
@Nullable
public Category get(long id) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetById(database.tableCategory, id);
if(entry != null) {
ResultSet rs = entry.getKey();
try {
rs.beforeFirst();
} catch (SQLException e) {
e.printStackTrace();
}
return get(entry);
}
return null;
}
/**
* getAll tableCategory by name.
*
* @param name tableCategory name
* @return {@link de.hsel.itech.db.pojo.Category}
*/
@Nullable
public Category get(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetsByValue(database.tableCategory, "name", name);
assert entry != null;
return get(entry);
}
/**
* getAll Category from database entry.
* @param entry entry
* @return Category
*/
@Nullable
private Category get(@NotNull Map.Entry<ResultSet, Connection> entry) {
ResultSet rs = entry.getKey();
Category category = null;
try {
while (rs.next()) {
category = new Category(rs.getLong("id"), rs.getString("name"), rs.getString("image"));
}
entry.getValue().close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return category;
}
/**
* getAll all categories.
*
* @return list of categories
*/
@Nullable
public List<Category> getAll() {
List<Long> ids = database.getIds(database.tableCategory);
List<Category> categories = new ArrayList<>();
for (long id : ids) {
categories.add(get(id));
}
return categories;
}
/**
* deletes tableCategory from database.
*
* @param id tableCategory count
* @return deletion count
*/
public int delete(long id) {
return database.delete(id, database.tableCategory);
}
/**
* inserts Category into database.
*
* @param category Category
* @return insert count
*/
public int insert(@NotNull Category category) {
Connection connection = database.getConnection();
assert connection != null;
int insertCount = 0;
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO category (name, image) VALUES (?, ?)");
statement.setString(1, category.getName());
statement.setString(2, category.getImage());
insertCount += statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
}

587
src/main/java/de/hsel/itech/db/Database.java
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@ -1,10 +1,6 @@
package de.hsel.itech.db;
import de.hsel.itech.config.Configuration;
import de.hsel.itech.db.pojo.Author;
import de.hsel.itech.db.pojo.Book;
import de.hsel.itech.db.pojo.Category;
import de.hsel.itech.db.pojo.Publisher;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.json.JSONObject;
@ -13,8 +9,10 @@ import org.mariadb.jdbc.MariaDbPoolDataSource;
import java.io.*;
import java.net.URL;
import java.nio.charset.Charset;
import java.sql.*;
import java.time.Year;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.AbstractMap;
import java.util.ArrayList;
import java.util.List;
@ -29,11 +27,16 @@ import java.util.Map;
*/
public class Database {
private final String book = "book";
private final String author = "author";
private final String authorBook = "author_book";
private final String publisher = "publisher";
private final String category = "category";
final String tableBook = "book";
final String tableAuthor = "author";
final String tableAuthorBook = "author_book";
final String tablePublisher = "publisher";
final String tableCategory = "category";
private AuthorDB authorDB;
private BookDB bookDB;
private CategoryDB categoryDB;
private PublisherDB publisherDB;
private static Database instance;
@ -88,7 +91,7 @@ public class Database {
* @return {@link java.sql.Connection}
*/
@Nullable
private Connection getConnection() {
Connection getConnection() {
try {
return dataSource.getConnection();
} catch (SQLException e) {
@ -97,537 +100,30 @@ public class Database {
return null;
}
/**
* gets author by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Author}
*/
@Nullable
public Author getAuthor(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSetById(author, id);
assert entry != null;
ResultSet rs = entry.getKey();
Author author = null;
try {
author = new Author(rs.getLong("id"), rs.getString("name"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return author;
public BookDB book() {
if(bookDB == null)
bookDB = new BookDB(this);
return bookDB;
}
/**
* gets author by name.
*
* @param name author name
* @return {@link de.hsel.itech.db.pojo.Author}
*/
@Nullable
public Author getAuthor(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(author, "name", name);
assert entry != null;
assert entry.getKey() != null;
Author author = null;
ResultSet rs = entry.getKey();
try {
if (rs.next())
author = new Author(rs.getLong("id"), rs.getString("name"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return author;
public AuthorDB author() {
if(authorDB == null)
authorDB = new AuthorDB(this);
return authorDB;
}
/**
* gets category by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Category}
*/
@Nullable
public Category getCategory(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSetById(category, id);
if(entry != null) {
ResultSet rs = entry.getKey();
try {
rs.beforeFirst();
} catch (SQLException e) {
e.printStackTrace();
}
return getCategory(entry);
}
return null;
public CategoryDB category() {
if (categoryDB == null)
categoryDB = new CategoryDB(this);
return categoryDB;
}
/**
* get category by name.
*
* @param name category name
* @return {@link de.hsel.itech.db.pojo.Category}
*/
@Nullable
public Category getCategory(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(category, "name", name);
assert entry != null;
return getCategory(entry);
public PublisherDB publisher() {
if(publisherDB == null)
publisherDB = new PublisherDB(this);
return publisherDB;
}
/**
* get Category from database entry.
* @param entry entry
* @return Category
*/
@Nullable
private Category getCategory(@NotNull Map.Entry<ResultSet, Connection> entry) {
ResultSet rs = entry.getKey();
Category category = null;
try {
while (rs.next()) {
category = new Category(rs.getLong("id"), rs.getString("name"), rs.getString("image"));
}
entry.getValue().close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return category;
}
/**
* get all categories.
*
* @return list of categories
*/
@Nullable
public List<Category> getCategories() {
List<Long> ids = getIds(category);
List<Category> categories = new ArrayList<>();
for (long id : ids) {
categories.add(getCategory(id));
}
return categories;
}
/**
* gets publisher by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Publisher}
*/
@Nullable
public Publisher getPublisher(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSetById(publisher, id);
assert entry != null;
ResultSet rs = entry.getKey();
Publisher publisher = null;
try {
publisher = new Publisher(rs.getLong("id"), rs.getString("name"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return publisher;
}
/**
* get publisher by name.
*
* @param name publisher name
* @return {@link de.hsel.itech.db.pojo.Publisher}
*/
@Nullable
public Publisher getPublisher(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(publisher, "name", name);
assert entry != null;
assert entry.getKey() != null;
Publisher publisher = null;
ResultSet rs = entry.getKey();
try {
while (rs.next()) {
publisher = new Publisher(rs.getLong("id"), rs.getString("name"));
}
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return publisher;
}
/**
* gets list of author ids from database.
*
* @param id book id from database
* @return {@link java.util.List}
*/
@Nullable
private List<Integer> getAuthors(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSetsById(authorBook, book, id);
assert entry != null;
try {
List<Integer> list = new ArrayList<>();
ResultSet rs = entry.getKey();
while (rs.next()) {
list.add(rs.getInt(author));
}
entry.getValue().close();
return list;
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
/**
* gets book by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Book}
*/
@Nullable
public Book getBook(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSetById(book, id);
assert entry != null;
return buildBook(entry);
}
/**
* builds book from entry.
*
* @param entry Map.Entry
* @return Book
*/
@Nullable
private Book buildBook(@NotNull Map.Entry<ResultSet, Connection> entry) {
Book book = null;
ResultSet rs = entry.getKey();
try {
Category category = getCategory(rs.getLong(this.category));
Publisher publisher = getPublisher(rs.getLong(this.publisher));
List<Integer> authorIds = getAuthors(rs.getLong("id"));
assert category != null;
assert publisher != null;
assert authorIds != null;
List<Author> authors = new ArrayList<>();
for (int i : authorIds) {
Author author = getAuthor(i);
assert author != null;
authors.add(author);
}
book = new Book(rs.getLong("id"), rs.getLong("isbn"), authors, publisher, category, rs.getString("title"),
Year.of(rs.getInt("year")), rs.getInt("price"), rs.getString("description"),
rs.getString("image"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return book;
}
/**
* gets all books.
*
* @return {@link java.util.List}
*/
@Nullable
public List<Book> getBooks() {
List<Long> ids = getIds(book);
List<Book> books = new ArrayList<>();
for (long id : ids) {
books.add(getBook(id));
}
return books;
}
/**
* gets books by category.
*
* @param category category id
* @return {@link java.util.List}
*/
@Nullable
public List<Book> getBooks(long category) {
Connection connection = getConnection();
assert connection != null;
List<Book> books = new ArrayList<>();
try {
PreparedStatement statement = connection.prepareStatement("SELECT (id) FROM book WHERE category = ?");
statement.setLong(1, category);
ResultSet resultSet = statement.executeQuery();
while (resultSet.next()) {
books.add(getBook(resultSet.getLong("id")));
}
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
return books;
}
/**
* get books by category.
*
* @param category Category object
* @return {@link java.util.List}
*/
@Nullable
public List<Book> getBooks(@NotNull Category category) {
return getBooks(category.getId());
}
/**
* exists book with isbn ?
*
* @param isbn isbn
* @return true if book with isbn exists
*/
public boolean existsBook(long isbn) {
Map.Entry<ResultSet, Connection> entry = getResultSetByValue(book, "isbn", isbn);
try {
if (entry != null && entry.getKey() != null) {
entry.getValue().close();
return true;
}
} catch (SQLException ex) {
ex.printStackTrace();
}
return false;
}
/**
* Inserts book into database.
* authors, publishers, and category have to exist.
*
* @param book Book
* @return insert count
*/
public int insert(@NotNull Book book) {
Connection connection = getConnection();
assert connection != null;
int insertCount = 0;
//author exists ?
List<Author> authors = new ArrayList<>();
for (Author author : book.getAuthors()) {
if (author.getId() == 0) {
Author dbAuthor = getAuthor(author.getName());
if (dbAuthor == null) {
insertCount += insert(author);
dbAuthor = getAuthor(author.getName());
}
authors.add(dbAuthor);
} else authors.add(author);
}
//publisher exists ?
Publisher publisher;
if (book.getPublisher().getId() == 0) {
Publisher dbPublisher = getPublisher(book.getPublisher().getName());
if (dbPublisher != null)
publisher = dbPublisher;
else {
insertCount += insert(new Publisher(book.getPublisher().getName()));
publisher = getPublisher(book.getPublisher().getName());
}
} else publisher = book.getPublisher();
//category exists ?
Category category;
if (book.getCategory().getId() == 0) {
Category dbCategory = getCategory(book.getCategory().getName());
if (dbCategory != null)
category = dbCategory;
else {
insertCount += insert(new Category(book.getCategory().getName(), getRandomImage()));
category = getCategory(book.getCategory().getName());
}
} else category = book.getCategory();
assert publisher != null;
assert category != null;
//insert book
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO book(isbn, title, description, " +
"price, year, publisher, category, image) VALUES (?, ?, ?, ?, ?, ?, ?, ?)", Statement.RETURN_GENERATED_KEYS);
statement.setLong(1, book.getIsbn());
statement.setString(2, book.getTitle());
statement.setString(3, book.getDescription());
statement.setInt(4, book.getPrice());
statement.setInt(5, book.getYear().getValue());
statement.setLong(6, publisher.getId());
statement.setLong(7, category.getId());
statement.setString(8, book.getImage());
insertCount += statement.executeUpdate();
ResultSet resultSet = statement.getGeneratedKeys();
long lastId = -1;
while (resultSet.next()) {
lastId = resultSet.getLong("id");
}
//add book to author
for (Author author : authors) {
PreparedStatement authorStatement = connection.prepareStatement("INSERT INTO " + authorBook + " (author, book) VALUES (?, ?);");
authorStatement.setLong(1, author.getId());
authorStatement.setLong(2, lastId);
insertCount += authorStatement.executeUpdate();
}
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
/**
* inserts Category into database.
*
* @param category Category
* @return insert count
*/
public int insert(@NotNull Category category) {
Connection connection = getConnection();
assert connection != null;
int insertCount = 0;
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO category (name, image) VALUES (?, ?)");
statement.setString(1, category.getName());
statement.setString(2, category.getImage());
insertCount += statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
/**
* inserts Author.
*
* @param author Author
* @return insert count
*/
public int insert(@NotNull Author author) {
Connection connection = getConnection();
assert connection != null;
int insertCount = 0;
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO author (name) VALUES (?)");
statement.setString(1, author.getName());
insertCount += statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
/**
* inserts Publisher.
*
* @param publisher Publisher
* @return insert count
*/
public int insert(@NotNull Publisher publisher) {
Connection connection = getConnection();
assert connection != null;
int insertCount = 0;
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO publisher (name) VALUES (?)");
statement.setString(1, publisher.getName());
insertCount += statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
/**
* deletes book from database.
*
* @param id book id
* @return deletion count
*/
public int deleteBook(long id) {
int deleteCount = 0;
try {
Connection connection = getConnection();
assert connection != null;
PreparedStatement statement = connection.prepareStatement("DELETE FROM author_book WHERE book = ?");
statement.setLong(1, id);
deleteCount = +statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
deleteCount += delete(id, book);
return deleteCount;
}
/**
* deletes author from database.
*
* @param id author id
* @return deletion count
*/
public int deleteAuthor(long id) {
return delete(id, author);
}
/**
* deletes publisher from database.
*
* @param id publisher id
* @return deletion count
*/
public int deletePublisher(long id) {
return delete(id, publisher);
}
/**
* deletes category from database.
*
* @param id category count
* @return deletion count
*/
public int deleteCategory(long id) {
return delete(id, category);
}
/**
@ -637,7 +133,7 @@ public class Database {
* @param table table name
* @return deletion count
*/
private int delete(long id, @NotNull String table) {
int delete(long id, @NotNull String table) {
Connection connection = getConnection();
assert connection != null;
@ -655,12 +151,12 @@ public class Database {
}
/**
* get all ids from specified table.
* getAll all ids from specified table.
*
* @param table table
* @return list of ids
*/
private List<Long> getIds(@NotNull String table) {
List<Long> getIds(@NotNull String table) {
Map.Entry<ResultSet, Connection> entry = getColumnsFromResultSet(table, "id");
assert entry != null;
@ -687,12 +183,12 @@ public class Database {
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSetById(@NotNull String table, long id) {
Map.Entry<ResultSet, Connection> getResultSetById(@NotNull String table, long id) {
return getResultSetByValue(table, "id", id);
}
@Nullable
private Map.Entry<ResultSet, Connection> getResultSetByValue(@NotNull String table, @NotNull String column, long value) {
Map.Entry<ResultSet, Connection> getResultSetByValue(@NotNull String table, @NotNull String column, long value) {
Connection connection = getConnection();
try {
assert connection != null;
@ -719,7 +215,7 @@ public class Database {
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSetsById(@NotNull String table, @NotNull String column, long id) {
Map.Entry<ResultSet, Connection> getResultSetsById(@NotNull String table, @NotNull String column, long id) {
Connection connection = getConnection();
try {
assert connection != null;
@ -741,7 +237,7 @@ public class Database {
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<ResultSet, Connection> getResultSetsByValue(@NotNull String table, @NotNull String column, @NotNull String value) {
Map.Entry<ResultSet, Connection> getResultSetsByValue(@NotNull String table, @NotNull String column, @NotNull String value) {
Connection connection = getConnection();
try {
assert connection != null;
@ -795,10 +291,9 @@ public class Database {
}
@Nullable
private String getRandomImage() {
String getRandomImage() {
try {
InputStream is = new URL("https://api.unsplash.com/photos/random?client_id=" + Configuration.get().getUnsplash().getAccessKey()).openStream();
try {
try (InputStream is = new URL("https://api.unsplash.com/photos/random?client_id=" + Configuration.get().getUnsplash().getAccessKey()).openStream()) {
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
StringBuilder sb = new StringBuilder();
int cp;
@ -807,8 +302,6 @@ public class Database {
}
JSONObject json = new JSONObject(sb.toString());
return json.getString("id");
} finally {
is.close();
}

110
src/main/java/de/hsel/itech/db/PublisherDB.java Normal file
View File

@ -0,0 +1,110 @@
package de.hsel.itech.db;
import de.hsel.itech.db.pojo.Publisher;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Map;
/**
* @author Johannes Theiner
* @version 0.1
* @since 0.5
**/
public class PublisherDB {
private Database database;
PublisherDB(Database database) {
this.database = database;
}
/**
* gets tablePublisher by id.
*
* @param id ID from database
* @return {@link de.hsel.itech.db.pojo.Publisher}
*/
@Nullable
public Publisher get(long id) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetById(database.tablePublisher, id);
assert entry != null;
ResultSet rs = entry.getKey();
Publisher publisher = null;
try {
publisher = new Publisher(rs.getLong("id"), rs.getString("name"));
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return publisher;
}
/**
* getAll tablePublisher by name.
*
* @param name tablePublisher name
* @return {@link de.hsel.itech.db.pojo.Publisher}
*/
@Nullable
public Publisher get(@NotNull String name) {
Map.Entry<ResultSet, Connection> entry = database.getResultSetsByValue(database.tablePublisher, "name", name);
assert entry != null;
assert entry.getKey() != null;
Publisher publisher = null;
ResultSet rs = entry.getKey();
try {
while (rs.next()) {
publisher = new Publisher(rs.getLong("id"), rs.getString("name"));
}
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return publisher;
}
/**
* inserts Publisher.
*
* @param publisher Publisher
* @return insert count
*/
public int insert(@NotNull Publisher publisher) {
Connection connection = database.getConnection();
assert connection != null;
int insertCount = 0;
try {
PreparedStatement statement = connection.prepareStatement("INSERT INTO publisher (name) VALUES (?)");
statement.setString(1, publisher.getName());
insertCount += statement.executeUpdate();
connection.close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return insertCount;
}
/**
* deletes tablePublisher from database.
*
* @param id tablePublisher id
* @return deletion count
*/
public int delete(long id) {
return database.delete(id, database.tablePublisher);
}
}

2
src/main/java/de/hsel/itech/db/pojo/Book.java
View File

@ -9,7 +9,7 @@ import java.time.Year;
import java.util.List;
/**
* POJO for Book.
* POJO for BookDB.
*
* @author Johannes Theiner
* @version 0.1

4
src/main/java/de/hsel/itech/jsf/CategoryBean.java
View File

@ -33,10 +33,10 @@ public class CategoryBean implements Serializable {
}
public List<Category> getCategories() {
return Database.getInstance().getCategories();
return Database.getInstance().category().getAll();
}
public List<Book> getBooks() {
return Database.getInstance().getBooks(category);
return Database.getInstance().book().getAll(category);
}
}

24
src/main/java/de/hsel/itech/jsf/SettingsBean.java Normal file
View File

@ -0,0 +1,24 @@
package de.hsel.itech.jsf;
import lombok.Getter;
import lombok.Setter;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
/**
* @author Johannes Theiner
* @version 0.1
* @since 0.5
**/
@ManagedBean
@SessionScoped
public class SettingsBean {
@Getter
@Setter
private boolean darkTheme = false;
}

10
src/main/java/de/hsel/itech/servlet/BookList.java
View File

@ -38,7 +38,7 @@ public class BookList extends HttpServlet {
protected void doPost(@NotNull final HttpServletRequest req, @NotNull final HttpServletResponse resp) throws IOException {
req.setCharacterEncoding(StandardCharsets.UTF_8.name());
//get database object
//getAll database object
Database db = Database.getInstance();
resp.setCharacterEncoding(StandardCharsets.UTF_8.name());
@ -51,7 +51,7 @@ public class BookList extends HttpServlet {
String param = req.getParameter("removeid");
if (param != null && Long.parseLong(param) != 0) {
long isbn = Long.parseLong(param);
db.deleteBook(isbn);
db.book().delete(isbn);
resp.sendRedirect("booklist");
}
@ -79,7 +79,7 @@ public class BookList extends HttpServlet {
String image = req.getParameter("image");
//check isbn
if (db.existsBook(isbn)) {
if (db.book().exists(isbn)) {
out.println("<aside class =\"m-note m-danger\">");
out.println("<h3>Es gibt bereits ein Buch mit dieser ISBN </h3>");
out.println("</aside>");
@ -96,7 +96,7 @@ public class BookList extends HttpServlet {
category,
title, Year.of(year), price, description, image
);
db.insert(book);
db.book().insert(book);
resp.sendRedirect("booklist");
}
} catch (Exception e) {
@ -110,7 +110,7 @@ public class BookList extends HttpServlet {
//list all books
List<Book> books = db.getBooks();
List<Book> books = db.book().getAll();
if (books != null) {
//book entries

2
src/main/webapp/categories.jsp
View File

@ -12,7 +12,7 @@
<h1 class="m-text-center">Kategorien</h1>
<div class="m-row">
<%
for(Category category : Objects.requireNonNull(Database.getInstance().getCategories())) {
for(Category category : Objects.requireNonNull(Database.getInstance().category().getAll())) {
%>
<div class="m-col-t-4">
<a href="category.jsp?id=<%= category.getId() %>">

4
src/main/webapp/category.jsp
View File

@ -22,7 +22,7 @@
} else {
long id = Long.valueOf(idValue);
Database db = Database.getInstance();
category = db.getCategory(id);
category = db.category().get(id);
if (category != null) {
%>
<div class="m-container">
@ -30,7 +30,7 @@
</h1>
<div class="m-row">
<%
for (Book book : Objects.requireNonNull(db.getBooks(category))) {
for (Book book : db.book().getAll(category)) {
%>
<div class="m-col-t-4">
<figure class="m-figure">

1
src/main/webapp/index.html
View File

@ -8,6 +8,7 @@
<li><a href="preview">Grobspezifikation</a></li>
<li><a href="booklist">Backend</a></li>
<li><a href="categories.jsp">Kategorienübersicht</a></li>
<li><a href="category.jsf">Warengruppe ausgeben</a></li>
</ul>
</body>
</html>

31
src/main/webapp/template.xhtml
View File

@ -14,7 +14,7 @@
<link href="css/custom.css" rel="stylesheet"/>
<link href="css/slick-theme.css" rel="stylesheet"/>
<link rel="stylesheet" type="text/css" href="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css"/>
<link rel="stylesheet" type="text/css" href="https://cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.css"/>
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.8.1/css/all.css"/>
<title>Amazon Light</title>
@ -37,7 +37,7 @@
<div id="m-navbar-collapse" class="m-col-t-12 m-show-m m-col-m-none m-right-m">
<div class="m-row">
<ol class="m-col-t-6 m-col-m-none">
<li><a href="#">Katalog</a></li>
<li><a href="category.jsf">Katalog</a></li>
<li><a href="#">(1) Warenkorb</a></li>
</ol>
<ol class="m-col-t-6 m-col-m-none" start="4">
@ -55,14 +55,19 @@
<a href="#"><i class="fas fa-ellipsis-v"/></a>
<ol>
<li>Dark Theme
<div class="onoffswitch">
<input type="checkbox" name="onoffswitch" class="onoffswitch-checkbox"
id="myonoffswitch" onchange="changeTheme()"/>
<label class="onoffswitch-label" for="myonoffswitch">
<span class="onoffswitch-inner"/>
<span class="onoffswitch-switch"/>
</label>
</div>
<h:form>
<div class="onoffswitch">
<h:selectBooleanCheckbox styleClass="onoffswitch-checkbox"
id="myonoffswitch"
title="onoffswitch" onchange="changeTheme()"
value="#{settingsBean.darkTheme}"/>
<h:outputLabel styleClass="onoffswitch-label" for="myonoffswitch">
<span class="onoffswitch-inner"/>
<span class="onoffswitch-switch"/>
</h:outputLabel>
</div>
</h:form>
</li>
</ol>
</li>
@ -132,8 +137,7 @@
<script type="text/javascript" src="//cdn.jsdelivr.net/npm/slick-carousel@1.8.1/slick/slick.min.js"/>
<script>
function changeTheme() {
if (document.getElementById('myonoffswitch').checked) {
if ('#{settingsBean.darkTheme}' === 'true') {
swapStyleSheet("dark", "#22272e");
} else {
swapStyleSheet("light", "#cb4b16");
@ -151,7 +155,8 @@
infinite: true,
slidesToShow: 6,
slidesToScroll: 3
})
});
changeTheme();
});
</script>
</body>