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

edit book servlet now interacts with database

Browse Source
This commit is contained in:
Julian Hinxlage 2019-04-23 15:32:52 +02:00
parent 15dddd5d30
commit c57fe04916
3 changed files with 104 additions and 44 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
src/main/java/de/hsel/itech/db/Database.java
View File

@ -146,6 +146,28 @@ public class Database {
return author;
}
@Nullable
public Author getAuthor(String name) {
Author author = null;
Map.Entry<List<ResultSet>, Connection> set = getResultSets(this.author, "name", name);
if(set == null){
return null;
}
if (set.getKey().size() > 0) {
try {
author = new Author(set.getKey().get(0).getLong("id"), set.getKey().get(0).getString("name"));
} catch (SQLException e) {
e.printStackTrace();
}
}
return author;
}
/**
* gets category by id.
*
@ -562,6 +584,32 @@ public class Database {
return null;
}
/**
* gets specific entries from table.
*
* @param table table name
* @param column column to match
* @return {@link java.util.Map.Entry}
*/
@Nullable
private Map.Entry<List<ResultSet>, Connection> getResultSets(@NotNull String table, @NotNull String column, @NotNull String value) {
Connection connection = getConnection();
try {
assert connection != null;
PreparedStatement statement = connection.prepareStatement("SELECT * FROM ? WHERE ? = ?");
statement.setString(1, table);
statement.setString(2, column);
statement.setString(3, value);
System.out.println(statement);
return getAllEntries(connection, statement);
} catch (SQLException ex) {
ex.printStackTrace();
}
return null;
}
/**
* gets all specified columns from table.
*

6
src/main/java/de/hsel/itech/servlet/AddBook.java
View File

@ -1,13 +1,10 @@
package de.hsel.itech.servlet;
import de.hsel.itech.db.pojo.Book;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
public class AddBook extends HttpServlet {
@ -20,7 +17,7 @@ public class AddBook extends HttpServlet {
Utillity.insertFile(out, "template_head.html");
de.hsel.itech.db.Database db = de.hsel.itech.db.Database.getInstance();
ArrayList<Book> books = db.getBooks();
//List<Book> books = db.getBooks();
out.println("<form class=\"m-container\" action=\"booklist\" method=post>");
Utillity.addInput(out,"Titel", "title");
@ -29,6 +26,7 @@ public class AddBook extends HttpServlet {
Utillity.addInput(out,"Jahr", "year", "2019");
Utillity.addInput(out,"Beschreibung", "description");
Utillity.addInput(out,"Verlag", "publisher");
Utillity.addInput(out,"Kategorie", "category");
Utillity.addInput(out,"Bild", "image", "DxAzOKSiPoE");
Utillity.addTypeButton(out, "Hinzufügen", "submit");
out.println("</form>");

94
src/main/java/de/hsel/itech/servlet/BookList.java
View File

@ -13,7 +13,7 @@ import java.io.PrintWriter;
import java.time.Year;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.Random;
import java.util.List;
public class BookList extends HttpServlet {
@ -34,13 +34,13 @@ public class BookList extends HttpServlet {
String param = req.getParameter("removeid");
if(param != null){
long isbn = Long.parseLong(param);
db.removeBook(isbn);
db.deleteBook(isbn);
resp.sendRedirect("booklist");
}
if(req.getParameter("title") != null){
String title = req.getParameter("title");
String author = req.getParameter("author");
String authorName = req.getParameter("author");
int price = Integer.parseInt(req.getParameter("price"));
int year = Integer.parseInt(req.getParameter("year"));
String category = req.getParameter("category");
@ -48,14 +48,24 @@ public class BookList extends HttpServlet {
String publisher = req.getParameter("publisher");
String image = req.getParameter("image");
ArrayList<Author> authors = new ArrayList<Author>();
Author author = null;
author = db.getAuthor(authorName);
if(author == null){
author = new Author(authorName);
db.insert(author);
}
authors.add(author);
Book book = new Book(
new Random().nextInt(),
new Author(0,author),
new Publisher(0,publisher),
new Category(0,category, "DxAzOKSiPoE"),
authors,
new Publisher(publisher),
new Category(category, "DxAzOKSiPoE"),
title, Year.of(year),price,description, image
);
db.addBook(book);
db.insert(book);
resp.sendRedirect("booklist");
}
@ -67,44 +77,48 @@ public class BookList extends HttpServlet {
Utillity.insertFile(out, "template_head.html");
ArrayList<Book> books = db.getBooks();
List<Book> books = db.getBooks();
//book entries
out.println("<div class=\"m-container\">");
for (Book book : books) {
if(books != null) {
out.println(" <div class=\"m-row\">");
//book entries
out.println("<div class=\"m-container\">");
for (Book book : books) {
out.println(" <div class=\"m-col-l-4\">");
out.println(" <img class=\"m-image\" src=\"https://source.unsplash.com/" + book.getImage() + "/300x300\" alt=\"Buchcover\">");
out.println(" </div>");
out.println(" <div class=\"m-row\">");
out.println(" <div class=\"m-col-l-4\">");
out.println("<h1>" + book.getTitle() + "</h1>");
out.println(" <br>");
out.println(" <h2>" + book.getAuthor().getName() + "</h2>");
out.println(" <br>");
out.print(" <h3>" + book.getPrice() / 100 + ",");
if(book.getPrice() % 100 < 10){
out.print("0");
out.println(" <div class=\"m-col-l-4\">");
out.println(" <img class=\"m-image\" src=\"https://source.unsplash.com/" + book.getImage() + "/300x300\" alt=\"Buchcover\">");
out.println(" </div>");
out.println(" <div class=\"m-col-l-4\">");
out.println("<h1>" + book.getTitle() + "</h1>");
out.println(" <br>");
for (int i = 0; i < book.getAuthors().size(); i++) {
out.println(" <h2>" + book.getAuthors().get(0).getName() + "</h2>");
}
out.println(" <br>");
out.print(" <h3>" + book.getPrice() / 100 + ",");
if (book.getPrice() % 100 < 10) {
out.print("0");
}
out.println(book.getPrice() % 100 + " &euro;</h3>");
out.println(" <br>");
out.println(" </div>");
out.println(" <div class=\"m-col-l-4\">");
out.println(" <div class=\"m-button m-danger\">");
out.println("<a href=\"/itech/booklist?removeid=" + book.getIsbn() + "\">");
out.println("Entfernen");
out.println("</a>");
out.println(" </div>");
out.println(" </div>");
out.println(" </div>");
}
out.println(book.getPrice() % 100 +" &euro;</h3>");
out.println(" <br>");
out.println(" </div>");
out.println(" <div class=\"m-col-l-4\">");
out.println(" <div class=\"m-button m-danger\">");
out.println("<a href=\"/itech/booklist?removeid=" + book.getIsbn() + "\">");
out.println("Entfernen");
out.println("</a>");
out.println(" </div>");
out.println(" </div>");
out.println(" </div>");
out.println("</div>");
}
out.println("</div>");
//add book button
Utillity.addButton(out,"Neues Buch Hinzufügen", "addbook");