updates to 6_CourseSchedulerGUI/*.java files; add 6_CourseSchedulerGUI/{CourseSchedulerGUI.java,README.md,img}; update .gitignore

Author: heracliteanflux

.gitignore

@@ -1,3 +1,5 @@
+.DS_Store
+
 # Compiled class file
 *.class
 

6_CourseSchedulerGUI/CourseEntry.java

@@ -1,4 +1,6 @@
-public class CourseEntry extends java.lang.Object {
+import java.lang.Object;
+
+public class CourseEntry extends Object {
 
   private String semester;
   private String courseCode;
@@ -28,17 +30,14 @@ public CourseEntry (String semester,
   public    int getSeats       () { return seats; }
   // END getters
 
-
+  
   // string representation of object `CourseEntry`
   @Override
   public String toString () {
     return String.format(
-      "Course Entry%n%s%n%s%n%s%n%d%n%n",
-      getSemester(),
-      getCourseCode(),
-      getDescription(),
-      getSeats()
+      "%s",
+      getCourseCode()
     );
   }
-  
-}
+
+}

6_CourseSchedulerGUI/CourseQueries.java

@@ -1,10 +1,11 @@
+import java.lang.Object;
 import java.sql.Connection;
 import java.sql.PreparedStatement;
 import java.sql.ResultSet;
 import java.sql.SQLException;
 import java.util.ArrayList;
 
-public class CourseQueries extends java.lang.Object {
+public class CourseQueries extends Object {
 
   private static        Connection conn;
   private static PreparedStatement selectAllCourses;
@@ -14,11 +15,12 @@ public class CourseQueries extends java.lang.Object {
   private static PreparedStatement deleteCourse;
   private static         ResultSet resultSet;
 
-  public ArrayList<CourseEntry> getAllCourses (String semester) {
+
+  public static ArrayList<CourseEntry> getAllCourses (String semester) {
     conn = DBConnection.getConnection();
     ArrayList<CourseEntry> results = new ArrayList<CourseEntry>();
     try {
-      selectAllCourses = conn.prepareStatement("select * from courses where semester = ?");
+      selectAllCourses = conn.prepareStatement("select * from app.courses where semester = ?");
       selectAllCourses.setString(1, semester);
       resultSet = selectAllCourses.executeQuery();
       while (resultSet.next()) {
@@ -36,26 +38,28 @@ public ArrayList<CourseEntry> getAllCourses (String semester) {
     return results;
   }
 
-  public void addCourse (CourseEntry course) {
+
+  public static void addCourse (CourseEntry course) {
     conn = DBConnection.getConnection();
     try {
-      insertCourse = conn.prepareStatement("insert into courses (semester, courseCode, description, seats) values (?, ?, ?, ?)");
+      insertCourse = conn.prepareStatement("insert into app.courses (semester, courseCode, description, seats) values (?, ?, ?, ?)");
       insertCourse.setString(1, course.getSemester());
       insertCourse.setString(2, course.getCourseCode());
       insertCourse.setString(3, course.getDescription());
-      insertCourse.setInt(4, course.getSeats());
+      insertCourse.setInt(   4,    course.getSeats());
       insertCourse.executeUpdate();
     }
     catch (SQLException se) {
       se.printStackTrace();
     }
   }
 
-  public ArrayList<String> getAllCourseCodes (String semester) {
+
+  public static ArrayList<String> getAllCourseCodes (String semester) {
     conn = DBConnection.getConnection();
     ArrayList<String> results = new ArrayList<String>();
     try {
-      selectAllCourseCodes = conn.prepareStatement("select courseCode from courses where semester = ?");
+      selectAllCourseCodes = conn.prepareStatement("select courseCode from app.courses where semester = ?");
       selectAllCourseCodes.setString(1, semester);
       resultSet = selectAllCourseCodes.executeQuery();
       while (resultSet.next()) {
@@ -68,15 +72,17 @@ public ArrayList<String> getAllCourseCodes (String semester) {
     return results;
   }
 
-  public int getCourseSeats (String semester,
-                             String courseCode)
+
+  public static int getCourseSeats (String semester,
+                                    String courseCode)
   {
     conn = DBConnection.getConnection();
     try {
-      selectCourseSeats = conn.prepareStatement("select seats from courses where semester = ? and courseCode = ?");
+      selectCourseSeats = conn.prepareStatement("select seats from app.courses where semester = ? and courseCode = ?");
       selectCourseSeats.setString(1, semester);
       selectCourseSeats.setString(2, courseCode);
       resultSet = selectCourseSeats.executeQuery();
+      resultSet.next();
       return resultSet.getInt("seats");
     }
     catch (SQLException se) {
@@ -85,12 +91,13 @@ public int getCourseSeats (String semester,
     }
   }
 
-  public void dropCourse (String semester,
-                          String courseCode)
+	
+  public static void dropCourse (String semester,
+                                 String courseCode)
   {
     conn = DBConnection.getConnection();
     try {
-      deleteCourse = conn.prepareStatement("delete from courses where semester = ? and courseCode = ?");
+      deleteCourse = conn.prepareStatement("delete from app.courses where semester = ? and courseCode = ?");
       deleteCourse.setString(1, semester);
       deleteCourse.setString(2, courseCode);
       deleteCourse.executeUpdate();
@@ -100,4 +107,4 @@ public void dropCourse (String semester,
     }
   }
 
-}
+}