Studium/Internet-Technologien
2
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

~ Database Configuration

Browse Source 
+ random Category image

Signed-off-by: Johannes Theiner <j.theiner@live.de>
This commit is contained in:
Johannes Theiner 2019-04-30 18:13:14 +02:00
parent b265adec2c
commit 813c3aa1f3
4 changed files with 121 additions and 72 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
pom.xml
View File

@ -261,11 +261,18 @@
<version>13.0</version> <version>13.0</version>
<scope>compile</scope> <scope>compile</scope>
</dependency> </dependency>
<dependency> <dependency>
<groupId>com.google.code.gson</groupId> <groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId> <artifactId>gson</artifactId>
<version>2.8.0</version> <version>2.8.0</version>
</dependency> </dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20180813</version>
</dependency>
<dependency> <dependency>
<groupId>org.mariadb.jdbc</groupId> <groupId>org.mariadb.jdbc</groupId>

182
src/main/java/de/hsel/itech/db/Database.java
View File

@ -7,12 +7,12 @@ import de.hsel.itech.db.pojo.Category;
import de.hsel.itech.db.pojo.Publisher; import de.hsel.itech.db.pojo.Publisher;
import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable; import org.jetbrains.annotations.Nullable;
import org.json.JSONObject;
import org.mariadb.jdbc.MariaDbPoolDataSource; import org.mariadb.jdbc.MariaDbPoolDataSource;
import java.io.BufferedReader; import java.io.*;
import java.io.FileReader;
import java.io.IOException;
import java.net.URL; import java.net.URL;
import java.nio.charset.Charset;
import java.sql.*; import java.sql.*;
import java.time.Year; import java.time.Year;
import java.util.AbstractMap; import java.util.AbstractMap;
@ -105,7 +105,7 @@ public class Database {
*/ */
@Nullable @Nullable
public Author getAuthor(long id) { public Author getAuthor(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, author); Map.Entry<ResultSet, Connection> entry = getResultSetById(author, id);
assert entry != null; assert entry != null;
ResultSet rs = entry.getKey(); ResultSet rs = entry.getKey();
@ -127,7 +127,7 @@ public class Database {
*/ */
@Nullable @Nullable
public Author getAuthor(String name) { public Author getAuthor(String name) {
Map.Entry<ResultSet, Connection> entry = getResultSets(author, "name", name); Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(author, "name", name);
assert entry != null; assert entry != null;
assert entry.getKey() != null; assert entry.getKey() != null;
@ -152,7 +152,7 @@ public class Database {
*/ */
@Nullable @Nullable
public Category getCategory(long id) { public Category getCategory(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, category); Map.Entry<ResultSet, Connection> entry = getResultSetById(category, id);
assert entry != null; assert entry != null;
ResultSet rs = entry.getKey(); ResultSet rs = entry.getKey();
@ -172,12 +172,17 @@ public class Database {
*/ */
@Nullable @Nullable
public Category getCategory(String name) { public Category getCategory(String name) {
Map.Entry<ResultSet, Connection> entry = getResultSets(category, "name", name); Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(category, "name", name);
assert entry != null; assert entry != null;
return getCategory(entry); return getCategory(entry);
} }
/**
* get Category from database entry.
* @param entry entry
* @return Category
*/
@Nullable @Nullable
private Category getCategory(@NotNull Map.Entry<ResultSet, Connection> entry) { private Category getCategory(@NotNull Map.Entry<ResultSet, Connection> entry) {
ResultSet rs = entry.getKey(); ResultSet rs = entry.getKey();
@ -193,6 +198,11 @@ public class Database {
return category; return category;
} }
/**
* get all categories.
*
* @return list of categories
*/
@Nullable @Nullable
public List<Category> getCategories() { public List<Category> getCategories() {
List<Long> ids = getIds(category); List<Long> ids = getIds(category);
@ -203,23 +213,6 @@ public class Database {
return categories; return categories;
} }
private List<Long> getIds(String table) {
Map.Entry<ResultSet, Connection> entry = getResultSets(table, "id");
assert entry != null;
List<Long> ids = new ArrayList<>();
try {
ResultSet rs = entry.getKey();
while (rs.next()) {
ids.add(rs.getLong("id"));
}
entry.getValue().close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return ids;
}
/** /**
* gets publisher by id. * gets publisher by id.
@ -229,7 +222,7 @@ public class Database {
*/ */
@Nullable @Nullable
public Publisher getPublisher(long id) { public Publisher getPublisher(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, publisher); Map.Entry<ResultSet, Connection> entry = getResultSetById(publisher, id);
assert entry != null; assert entry != null;
ResultSet rs = entry.getKey(); ResultSet rs = entry.getKey();
@ -251,7 +244,7 @@ public class Database {
*/ */
@Nullable @Nullable
public Publisher getPublisher(String name) { public Publisher getPublisher(String name) {
Map.Entry<ResultSet, Connection> entry = getResultSets(publisher, "name", name); Map.Entry<ResultSet, Connection> entry = getResultSetsByValue(publisher, "name", name);
assert entry != null; assert entry != null;
assert entry.getKey() != null; assert entry.getKey() != null;
@ -277,7 +270,7 @@ public class Database {
*/ */
@Nullable @Nullable
private List<Integer> getAuthors(long id) { private List<Integer> getAuthors(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSets(id, authorBook, book); Map.Entry<ResultSet, Connection> entry = getResultSetsById(authorBook, book, id);
assert entry != null; assert entry != null;
try { try {
List<Integer> list = new ArrayList<>(); List<Integer> list = new ArrayList<>();
@ -301,28 +294,22 @@ public class Database {
*/ */
@Nullable @Nullable
public Book getBook(long id) { public Book getBook(long id) {
Map.Entry<ResultSet, Connection> entry = getResultSet(id, book); Map.Entry<ResultSet, Connection> entry = getResultSetById(book, id);
assert entry != null; assert entry != null;
return getBook(entry); return buildBook(entry);
}
private Book getBook(@NotNull Map.Entry<ResultSet, Connection> entry) {
ResultSet rs = entry.getKey();
Book book = null;
try {
book = buildBook(rs);
entry.getValue().close();
} catch (SQLException e) {
e.printStackTrace();
}
return book;
} }
/**
* builds book from entry.
*
* @param entry Map.Entry
* @return Book
*/
@Nullable @Nullable
private Book buildBook(ResultSet rs) { private Book buildBook(@NotNull Map.Entry<ResultSet, Connection> entry) {
Book book = null; Book book = null;
ResultSet rs = entry.getKey();
try { try {
Category category = getCategory(rs.getLong(this.category)); Category category = getCategory(rs.getLong(this.category));
Publisher publisher = getPublisher(rs.getLong(this.publisher)); Publisher publisher = getPublisher(rs.getLong(this.publisher));
@ -341,6 +328,7 @@ public class Database {
Year.of(rs.getInt("year")), rs.getInt("price"), rs.getString("description"), Year.of(rs.getInt("year")), rs.getInt("price"), rs.getString("description"),
rs.getString("image")); rs.getString("image"));
entry.getValue().close();
} catch (SQLException e) { } catch (SQLException e) {
e.printStackTrace(); e.printStackTrace();
} }
@ -391,19 +379,6 @@ public class Database {
return books; return books;
} }
public boolean existsBook(long isbn) {
Map.Entry<ResultSet, Connection> entry = getResultSet(book, "isbn", isbn);
try {
if (entry != null && entry.getKey() != null) {
entry.getValue().close();
return true;
}
} catch (SQLException ex) {
ex.printStackTrace();
}
return false;
}
/** /**
* get books by category. * get books by category.
* *
@ -415,6 +390,25 @@ public class Database {
return getBooks(category.getId()); 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. * Inserts book into database.
@ -461,7 +455,7 @@ public class Database {
if (dbCategory != null) if (dbCategory != null)
category = dbCategory; category = dbCategory;
else { else {
insertCount += insert(new Category(book.getCategory().getName(), book.getCategory().getImage())); insertCount += insert(new Category(book.getCategory().getName(), getRandomImage()));
category = getCategory(book.getCategory().getName()); category = getCategory(book.getCategory().getName());
} }
} else category = book.getCategory(); } else category = book.getCategory();
@ -656,21 +650,45 @@ public class Database {
return deleteCount; return deleteCount;
} }
/**
* get all ids from specified table.
*
* @param table table
* @return list of ids
*/
private List<Long> getIds(String table) {
Map.Entry<ResultSet, Connection> entry = getColumnsFromResultSet(table, "id");
assert entry != null;
List<Long> ids = new ArrayList<>();
try {
ResultSet rs = entry.getKey();
while (rs.next()) {
ids.add(rs.getLong("id"));
}
entry.getValue().close();
} catch (SQLException ex) {
ex.printStackTrace();
}
return ids;
}
/** /**
* gets specific entry from database. * gets specific entry from database.
* *
* @param id id from database
* @param table table name * @param table table name
* @param id id from database
* @return {@link java.util.Map.Entry} * @return {@link java.util.Map.Entry}
*/ */
@Nullable @Nullable
private Map.Entry<ResultSet, Connection> getResultSet(long id, String table) { private Map.Entry<ResultSet, Connection> getResultSetById(String table, long id) {
return getResultSet(table, "id", id); return getResultSetByValue(table, "id", id);
} }
@Nullable @Nullable
private Map.Entry<ResultSet, Connection> getResultSet(String table, String column, long value) { private Map.Entry<ResultSet, Connection> getResultSetByValue(String table, String column, long value) {
Connection connection = getConnection(); Connection connection = getConnection();
try { try {
assert connection != null; assert connection != null;
@ -691,20 +709,20 @@ public class Database {
/** /**
* gets specific entries from table. * gets specific entries from table.
* *
* @param id id all entries should reference
* @param table table name * @param table table name
* @param column column to match * @param column column to match
* @param id id all entries should reference
* @return {@link java.util.Map.Entry} * @return {@link java.util.Map.Entry}
*/ */
@Nullable @Nullable
private Map.Entry<ResultSet, Connection> getResultSets(long id, @NotNull String table, @NotNull String column) { private Map.Entry<ResultSet, Connection> getResultSetsById(@NotNull String table, @NotNull String column, long id) {
Connection connection = getConnection(); Connection connection = getConnection();
try { try {
assert connection != null; assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?"); PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?");
statement.setLong(1, id); statement.setLong(1, id);
return getAllEntries(connection, statement); return getAllEntriesFromResultSet(connection, statement);
} catch (SQLException ex) { } catch (SQLException ex) {
ex.printStackTrace(); ex.printStackTrace();
} }
@ -719,14 +737,14 @@ public class Database {
* @return {@link java.util.Map.Entry} * @return {@link java.util.Map.Entry}
*/ */
@Nullable @Nullable
private Map.Entry<ResultSet, Connection> getResultSets(@NotNull String table, @NotNull String column, @NotNull String value) { private Map.Entry<ResultSet, Connection> getResultSetsByValue(@NotNull String table, @NotNull String column, @NotNull String value) {
Connection connection = getConnection(); Connection connection = getConnection();
try { try {
assert connection != null; assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?"); PreparedStatement statement = connection.prepareStatement("SELECT * FROM " + table + " WHERE " + column + " = ?");
statement.setString(1, value); statement.setString(1, value);
return getAllEntries(connection, statement); return getAllEntriesFromResultSet(connection, statement);
} catch (SQLException ex) { } catch (SQLException ex) {
ex.printStackTrace(); ex.printStackTrace();
} }
@ -741,13 +759,13 @@ public class Database {
* @return {@link java.util.Map.Entry} * @return {@link java.util.Map.Entry}
*/ */
@Nullable @Nullable
private Map.Entry<ResultSet, Connection> getResultSets(@NotNull String table, @NotNull String... columns) { private Map.Entry<ResultSet, Connection> getColumnsFromResultSet(@NotNull String table, @NotNull String... columns) {
Connection connection = getConnection(); Connection connection = getConnection();
try { try {
assert connection != null; assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT (" + String.join(",", columns) + ") FROM " + table); PreparedStatement statement = connection.prepareStatement("SELECT (" + String.join(",", columns) + ") FROM " + table);
return getAllEntries(connection, statement); return getAllEntriesFromResultSet(connection, statement);
} catch (SQLException ex) { } catch (SQLException ex) {
ex.printStackTrace(); ex.printStackTrace();
} }
@ -762,7 +780,7 @@ public class Database {
* @return {@link java.util.Map.Entry} * @return {@link java.util.Map.Entry}
*/ */
@Nullable @Nullable
private Map.Entry<ResultSet, Connection> getAllEntries(@NotNull Connection connection, @NotNull PreparedStatement statement) { private Map.Entry<ResultSet, Connection> getAllEntriesFromResultSet(@NotNull Connection connection, @NotNull PreparedStatement statement) {
try { try {
ResultSet resultSet = statement.executeQuery(); ResultSet resultSet = statement.executeQuery();
return new AbstractMap.SimpleEntry<>(resultSet, connection); return new AbstractMap.SimpleEntry<>(resultSet, connection);
@ -771,4 +789,28 @@ public class Database {
} }
return null; return null;
} }
@Nullable
private String getRandomImage() {
try {
InputStream is = new URL("https://api.unsplash.com/photos/random?client_id=bb18673959b1cfd053a4ecb58e85bb8d99a0050ae5b71dac3e7632916eead9aa").openStream();
try {
BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
StringBuilder sb = new StringBuilder();
int cp;
while ((cp = rd.read()) != -1) {
sb.append((char) cp);
}
JSONObject json = new JSONObject(sb.toString());
return json.getString("id");
} finally {
is.close();
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
} }

2
src/main/java/de/hsel/itech/servlet/AddBook.java
View File

@ -37,7 +37,7 @@ public class AddBook extends HttpServlet {
Utillity.addInput(out,"Beschreibung", "description"); Utillity.addInput(out,"Beschreibung", "description");
Utillity.addInput(out,"Verlag", "publisher"); Utillity.addInput(out,"Verlag", "publisher");
Utillity.addInput(out,"Kategorie", "category"); Utillity.addInput(out,"Kategorie", "category");
Utillity.addInput(out,"Bild", "image", "DxAzOKSiPoE"); Utillity.addInput(out,"Bild", "image");
Utillity.addSubmitButton(out, "Hinzufügen"); Utillity.addSubmitButton(out, "Hinzufügen");
out.println("</form>"); out.println("</form>");

2
src/test/java/de/hsel/itech/HelloTest.java
View File

@ -13,6 +13,6 @@ public class HelloTest {
@Test @Test
void hello() { void hello() {
assertEquals(2, 1+1); assertEquals(2, 1 + 1);
} }
} }