Initial commit

.idea/misc.xml

@@ -13,7 +13,7 @@
     <ConfirmationsSetting value="0" id="Add" />
     <ConfirmationsSetting value="0" id="Remove" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" assert-keyword="true" jdk-15="true" project-jdk-name="Java 8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

Assessment-7/Assessment-7.iml

@@ -7,5 +7,15 @@
     </content>
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="module-library">
+      <library>
+        <CLASSES>
+          <root url="file://C:/Program Files/Java/jdk1.8.0_66/db/lib" />
+        </CLASSES>
+        <JAVADOC />
+        <SOURCES />
+        <jarDirectory url="file://C:/Program Files/Java/jdk1.8.0_66/db/lib" recursive="false" />
+      </library>
+    </orderEntry>
   </component>
 </module>

Assessment-7/src/DisplayAuthors.java

@@ -1,12 +1,48 @@
 import java.sql.*;
+import java.util.Scanner;
+
 
 public class DisplayAuthors {
 
 
     public static void main(String... args) {
+        System.out.println("What would you like to do:\n1. Print all authors\n2. Select all books by a specific author\nOther: quit.");
+        Scanner scanner = new Scanner(System.in);
+        int choice = scanner.nextInt();
+        if (choice != 1 && choice != 2) {
+            System.out.println("You did not choose to print authors or books, exiting.");
+        } else {
+            handleDatabase(choice);
+        }
+
+    }
+
+    public static void handleDatabase(int choice) {
+
         final String DATABASE_URL = "jdbc:derby:books";
-        final String SELECT_QUERY =
-                "SELECT authorID, firstName, lastName, FROM authors";
+        String SELECT_QUERY;
+        int id = 0;
+        if (choice == 1) {
+            SELECT_QUERY =
+                    "SELECT authorID, firstName, lastName FROM authors";
+        } else {
+            System.out.println("Please enter the author ID for the author whose books you want: ");
+            id = new Scanner(System.in).nextInt(); //One-liner for reading input :D
+            SELECT_QUERY =
+                    "SELECT title, copyright, titles.isbn FROM titles\n" +
+                            "JOIN authorISBN ON authorISBN.isbn = titles.isbn\n" +
+                            "JOIN authors ON authors.authorID = authorISBN.authorID WHERE authors.authorID = " + id;
+
+            //This could have been made way shorter using a subquery by Apache Derby is stupid and didn't like it.
+            //I don't know why anyone would ever want to use a RDBM written in pure Java. Aside from very specific
+            //Embedded cases or something, you should use SQLite.
+            /*
+                SELECT titles.title, titles.copyright, titles.isbn FROM titles GROUP BY isbn
+                HAVING isbn in (SELECT isbn FROM authorISBN WHERE authorID = 1)
+
+                WHY DOESN'T THAT ^ WORK >:(
+             */
+        }
 
         try (Connection conn = DriverManager.getConnection(
                 DATABASE_URL, "deitel", "deitel");
@@ -16,8 +52,11 @@ public class DisplayAuthors {
             ResultSetMetaData metaData = resultSet.getMetaData();
             int numberOfColumns = metaData.getColumnCount();
 
-            System.out.printf("Authors Table of Books Database:%n%n");
-
+            if (choice == 1) {
+                System.out.printf("Authors Table of Books Database:%n%n");
+            } else {
+                System.out.printf("Books written by author with ID: " + id + "%n%n");
+            }
             for (int i = 1; i <= numberOfColumns; i++)
                 System.out.printf("%-8s\t", metaData.getColumnName(i));
             System.out.println();
@@ -32,7 +71,6 @@ public class DisplayAuthors {
         } catch (SQLException sqlException) {
             sqlException.printStackTrace();
         }
-
     }
 
-}
+}