primer commit topic 4

FernandoEmanuelBarrios/Topic4_choco/src/main/java/com/topic4/choco/Driver.java

@@ -0,0 +1,57 @@
+package com.topic4.choco;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class Driver {
+
+	private static Connection con = null;
+	private static Driver instance = null;
+
+	private Driver() {
+		try {
+			String driver = "com.mysql.jdbc.Driver";
+			String url = "jdbc:mysql://127.0.0.1/high_school";
+			String pwd = "root";
+			String usr = "root";
+			Class.forName(driver);
+
+			con = DriverManager.getConnection(url, usr, pwd);
+
+		} catch (SQLException ex) {
+
+			System.err.println(ex.getMessage());
+
+		} catch (ClassNotFoundException ex) {
+
+			System.err.println(ex.getMessage());
+
+		}
+	}
+
+	public static synchronized Driver getInstance() {
+		if (instance == null) {
+			instance = new Driver();
+			System.out.println("Conexion Realizada!!");
+		}
+		return instance;
+	}
+
+	public static Connection getConnect() {
+		return con;
+	}
+
+	private static void closeConnection() {
+		try {
+			con.close();
+		} catch (Exception e) {
+			System.out.println("Error al cerrar la conexión.");
+		}
+	}
+
+	public static void delInstance() {
+		closeConnection();
+		instance = null;
+	}
+}

FernandoEmanuelBarrios/Topic4_choco/src/main/java/com/topic4/choco/ListCourse.java

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+package com.topic4.choco;
+
+import java.sql.ResultSet;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+
+import com.mysql.jdbc.PreparedStatement;
+
+public class ListCourse {
+	public static void main(String[] args) {
+		try {
+
+			ArrayList<String> courses = new ArrayList<String>();
+
+			HashMap<String, ArrayList<String>> map = new HashMap<String, ArrayList<String>>();
+
+			Driver conn = Driver.getInstance();
+			String operator = ">";
+			String query = "Select Teacher.first_name as firstName, Teacher.teacher_id, Teacher.last_name as lastName,"
+					+ " Course.name as courseName,Schedule_time.beginning_hours as "
+					+ "startHours, Schedule_time.ending_hours endHours,Schedule_time.date as dateSchudele"
+					+ " from Schedule_time " + "left join Course "
+					+ "on Course.schedule_time_id = Schedule_time.schedule_time_id " + "left join Teacher_course "
+					+ "on Teacher_course.course_id = Course.course_id " + "left join Teacher "
+					+ "on Teacher.teacher_id = Teacher_course.teacher_id " + "where Teacher_course.teacher_id = ?;";
+			PreparedStatement prepStmt = (PreparedStatement) conn.getConnect().prepareStatement(query);
+			prepStmt.setInt(1, 1);
+			prepStmt.execute();
+			ResultSet rst = prepStmt.executeQuery();
+			String courseName=null;
+
+			String teacher;
+			while (rst.next()) {
+				teacher="Teacher \n"+rst.getString("lastName")+" "+rst.getString("firstName");
+				if("1".equalsIgnoreCase(rst.getString("teacher_id"))){
+					courses.add(rst.getString("dateSchudele") + " " + rst.getString("startHours") +" "+rst.getString("endHours")+" " 
+				+ rst.getString("courseName"));
+				}
+				if("2".equalsIgnoreCase(rst.getString("teacher_id"))){
+					courses.add(rst.getString("dateSchudele") + " " + rst.getString("startHours") +" "+rst.getString("endHours")+" "
+							+ rst.getString("courseName"));
+				}
+				if("3".equalsIgnoreCase(rst.getString("teacher_id"))){
+					courses.add(rst.getString("dateSchudele") + " " + rst.getString("startHours") +" "+rst.getString("endHours")+" "
+							+ rst.getString("courseName"));
+				}
+				map.put(teacher, courses);
+			}
+			//recorro el mapa
+			Iterator<String> it=map.keySet().iterator();
+			String key;
+			Iterator<String>itSchudele;
+			while(it.hasNext()){
+				key=it.next();
+				System.out.println(key +"\n Schudele \n ");
+				itSchudele=map.get(key).iterator();
+				while(itSchudele.hasNext()){
+					System.out.println(itSchudele.next());
+				}
+			}
+
+
+		} catch (Exception ex) {
+			ex.printStackTrace();
+		} finally {
+			Driver.delInstance();
+		}
+
+	}
+}

FernandoEmanuelBarrios/Topic4_choco/src/main/java/com/topic4/choco/Main.java

@@ -0,0 +1,60 @@
+package com.topic4.choco;
+
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Iterator;
+
+public class Main {
+	public static void main(String[] args) {
+		try {
+			ArrayList<String> lengua = new ArrayList<String>();
+			ArrayList<String> matematica = new ArrayList<String>();
+			ArrayList<String> geografia = new ArrayList<String>();
+
+			HashMap<String, ArrayList<String>> map = new HashMap<String, ArrayList<String>>();
+
+			Driver con = Driver.getInstance();
+			Statement stmt = con.getConnect().createStatement();
+			ResultSet rst = stmt.executeQuery("SELECT * FROM Course crs LEFT JOIN Student_course std_c ON crs.course_id = std_c.course_id "
+					+ "LEFT JOIN Student std ON std_c.student_id = std.student_id "
+					+ "LEFT JOIN Teacher_course tc  ON crs.course_id = tc.course_id "
+					+ "LEFT JOIN Teacher tch ON tc.teacher_id = tch.teacher_id ORDER BY std.last_name");
+
+			while (rst.next()) {
+
+				if (rst.getString("name").equalsIgnoreCase("Lengua")) {
+					lengua.add(rst.getString("std.first_name") + " " + rst.getString("std.last_name"));
+					map.put("Course: "+rst.getString("name")+"\n"+"Teacher: " + rst.getString("tch.first_name") + ", " +
+							rst.getString("tch.last_name") + "\n" + "Students: \n"  , lengua);
+				}
+
+				if (rst.getString("name").equalsIgnoreCase("musica")) {
+					matematica.add(rst.getString("std.first_name") + " " + rst.getString("std.last_name"));
+					map.put("Course: "+rst.getString("name")+"\n"+"Teacher: " + rst.getString("tch.first_name") + ", " +
+							rst.getString("tch.last_name") + "\n" + "Students: \n"  , matematica);
+				}
+
+				if (rst.getString("name").equalsIgnoreCase("historia")) {
+					geografia.add(rst.getString("std.first_name") + " " + rst.getString("std.last_name"));
+					map.put("Course: "+rst.getString("name")+"\n"+"Teacher: " + rst.getString("tch.first_name") + ", " +
+							rst.getString("tch.last_name") + "\n" + "Students: \n"  , geografia);
+				}
+
+			}
+
+			Iterator<String> it = map.keySet().iterator();
+			while (it.hasNext()) {
+				String key = it.next();
+				System.out.println(key + map.get(key)+ "\n");
+			}
+
+		} catch (Exception ex) {
+			ex.printStackTrace();
+		} finally {
+			Driver.delInstance();
+		}
+	}
+
+}

FernandoEmanuelBarrios/Topic4_choco/src/main/java/com/topic4/choco/PercentageOfStudents.java

@@ -0,0 +1,44 @@
+package com.topic4.choco;
+
+import java.sql.ResultSet;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.HashMap;
+
+import com.mysql.jdbc.PreparedStatement;
+
+public class PercentageOfStudents {
+	public static void main(String[] args) {
+		try {
+			ArrayList<String> lengua = new ArrayList<String>();
+			ArrayList<String> matematica = new ArrayList<String>();
+			ArrayList<String> geografia = new ArrayList<String>();
+
+			HashMap<String, ArrayList<String>> map = new HashMap<String, ArrayList<String>>();
+
+			Driver con = Driver.getInstance();
+			String query = "UPDATE `high_school`.`Student_course` SET `final_note`= ((parcial_note_1+parcial_note_2+parcial_note_3)/3) "
+					+ "WHERE `student_course_id`=?";
+			PreparedStatement prepareStmt = (PreparedStatement) con.getConnect().prepareStatement(query);
+			for (int i = 1; i <= 20; i++) {
+				prepareStmt.setInt(1, i);
+				prepareStmt.executeUpdate();
+			}
+			Driver conn = Driver.getInstance();
+            String operator=">";
+            query = "select Course.course_id, Course.name,avg(Student_course.final_note) as Promedio from Course left join Student_course on Student_course.course_id = Course.course_id where Course.course_id = ? and Student_course.final_note "+operator+ " 6 Group By Course.name Order By Course.course_id";
+            PreparedStatement prepStmt = (PreparedStatement) conn.getConnect().prepareStatement(query);
+            prepStmt.setInt(1, 1);
+            prepStmt.execute();
+            ResultSet rst = prepStmt.executeQuery();
+            while(rst.next()){
+            	System.out.println(rst.getString("Promedio"));
+            }
+
+		} catch (Exception ex) {
+			ex.printStackTrace();
+		} finally {
+			Driver.delInstance();
+		}
+	}
+}