Add query to get guardian object by pin#

Add query to get children by guardian object.

SqliteDataAccess.cs

@@ -17,6 +17,58 @@ namespace GreatHomeChildcare
         #endregion
 
         #region guardian
+        // ***************** Read *****************
+
+        /* Gets a Guardian by a distinct pin number. Distinctness enforced elsewhere.
+         * INPUT: integer pin#
+         * OUTPUT: Guardian object
+         */
+        internal Guardian GetGuardianByPin(int guardian_pin_in)
+        {
+            using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
+            {
+                string strQuery = "SELECT * FROM Guardians WHERE PinNumber = @pin_in";
+                Guardian guardian = cnn.Query<Guardian>(strQuery, new { pin_in = guardian_pin_in }).SingleOrDefault();
+                return guardian;
+            }
+        }
+        #endregion
+
+        #region authorized_guardians
+        // ***************** Read *****************
+
+        /* Gets a list of all children per a specific guardian.
+         * INPUT: Guardian
+         * OUTPUT: List of Child object.
+         */
+        internal List<Child> GetChildrenByGuardian(Guardian guardian_in)
+        {
+            //TODO: Remove once valid login check is implemented.
+            if (guardian_in == null)
+                return null;
+
+            using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
+            {
+                string strQuery = @"
+SELECT
+Children.id,
+Children.FirstName,
+Children.LastName,
+DOB,
+address,
+race,
+gender,
+photo
+FROM Children
+INNER JOIN Authorized_Guardians on Children.ID = Authorized_Guardians.child_id
+INNER JOIN Guardians on Authorized_Guardians.guardian_id = Guardians.id
+WHERE Guardians.id = @id
+";
+                var output = cnn.Query<Child>(strQuery,guardian_in);
+                return output.ToList();
+            }
+        }
+
         #endregion
 
         #region attendance
@@ -42,12 +94,6 @@ namespace GreatHomeChildcare
             }
         }
 
-        //TODO: implement
-        internal List<Child> GetChildrenByGuardianID(int guardian_id_in)
-        {
-            return null;
-        }
-
         #region reports
         #endregion