DAO Examen

backend/src/main/java/mx/uv/Controller/DAO_Examen.java

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+package mx.uv.Controller;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.sql.Statement;
+import java.util.ArrayList;
+import java.util.List;
+
+import mx.uv.Model.Examen;
+
+public class DAO_Examen {
+
+    private static Conexion cn = Conexion.getInstance();
+
+    public static List<Examen> dameExamenes(){
+        Statement stm = null;
+        ResultSet rs = null;
+        Connection conn = null;
+        List<Examen> resultado = new ArrayList<>();
+
+        conn = cn.conectar();
+
+        try {
+            String sql = "SELECT * from examen";
+            stm = conn.createStatement();
+            rs = stm.executeQuery(sql);
+            while (rs.next()) {
+                Examen u = new Examen(rs.getInt(1),rs.getDouble(2),rs.getBoolean(3),rs.getInt(4));
+                resultado.add(u);
+            }
+        } catch (Exception e) {
+            System.out.println(e);
+        } finally {
+            cerrarConexiones(null, conn);
+        }
+        return resultado;
+    }
+
+
+    public static boolean agregarExamen(Examen examen){
+        PreparedStatement stm = null;
+        Connection conn = null;
+        boolean msj = false;
+
+        conn = cn.conectar();
+
+        try{
+            String sql = "INSERT INTO `examen` (`calificacion`, `derechoInscripcion`) VALUES(?,?);";
+            stm = (PreparedStatement) conn.prepareStatement(sql);
+            stm.setDouble(1, examen.getCalificacion());
+            stm.setBoolean(2, examen.isDerechoInscripcion());
+        
+        } catch (Exception e) {
+            System.out.println(e);
+        } finally {
+            cerrarConexiones(stm, conn);
+        }
+        return msj;    
+    }
+
+
+    private static void cerrarConexiones(PreparedStatement stm, Connection conn) {
+        if(stm != null){
+            try{
+                stm.close();
+            }catch(Exception e){
+                System.out.println(e);
+            }
+            stm = null;
+        }
+        try{
+            conn.close();
+            cn.cerrarConexion();
+        } catch(Exception e){
+            System.out.println(e);
+        }
+    }
+
+    public static boolean eliminarExamen(int id){
+        return false;
+    }
+
+    public static boolean editarExamen(Examen examen){
+        PreparedStatement stm = null;
+        Connection conn = null;
+        boolean verificacion = false;
+        conn = cn.conectar();
+
+        try{
+            String sql = "UPDATE `examen` SET `calificacion` = ?, `derechoInscripcion` = ? WHERE `idExamen` = ?;";
+            stm = conn.prepareStatement(sql);
+            stm.executeQuery();
+            verificacion = true;
+        } catch (SQLException ex){
+            System.err.println(ex);
+        } finally{
+            cerrarConexiones(stm, conn);
+            cn.cerrarConexion();
+        }
+
+        return verificacion;
+    }
+
+
+
+
+}