Add comment (not region) for crud operations within each region.

Add code to sign a student in or out.
Add code to get a student sign in/out status.

SqliteDataAccess.cs

@@ -9,14 +9,24 @@ using System.Text;
 using System.Threading.Tasks;
 using GreatHomeChildcare.Models;
 
+/* REFERENCES:
+https://stackoverflow.com/questions/16436485/sqlite-selecting-the-maximum-corresponding-value
+*/
+
 namespace GreatHomeChildcare
 {
     class SqliteDataAccess
     {
         #region student
+        // ***************** Create *****************
+        // ***************** Read *******************
+        // ***************** Update *****************
+        // ***************** Delete *****************
         #endregion
 
         #region guardian
+        // ***************** Create *****************
+
         // ***************** Read *****************
 
         /* Gets a Guardian by a distinct pin number. Distinctness enforced elsewhere.
@@ -32,9 +42,13 @@ namespace GreatHomeChildcare
                 return guardian;
             }
         }
+        // ***************** Update *****************
+        // ***************** Delete *****************
         #endregion
 
         #region authorized_guardians
+        // ***************** Create *****************
+
         // ***************** Read *****************
 
         /* Gets a list of all children per a specific guardian.
@@ -68,14 +82,63 @@ WHERE Guardians.id = @id
                 return output.ToList();
             }
         }
-
+        // ***************** Update *****************
+        // ***************** Delete *****************
         #endregion
 
         #region attendance
+        // ***************** Create *****************
+
+        /* Creates a new entry in the attendence table each time
+         * a child is signed in our out of the system.
+         * Does --NOT-- need an Update function as the system
+         * is designed to keep track of --all-- times a child
+         * is signed in or out, and by which guardian.
+         * INPUTS: child, guardian
+         * OUTPUT: none to program, new row to sql db.
+         */
+        internal void SignChildInOut(Child child_in, Guardian guardian_in)
+        {
+            string strStudentStatus = GetChildSignInOut(child_in);
+
+            using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
+            {
+                string strInOut = (strStudentStatus == "in" ? "out" : "in");
+                string strQuery = "INSERT INTO Attendence(child_id, guardian_id,in_out) VALUES(@child_id, @guardian_id, @in_out)";
+                cnn.Execute(strQuery, new
+                {
+                    child_id = child_in.id,
+                    guardian_id = guardian_in.id,
+                    in_out = strInOut
+                });
+            }
+        }
+
+        // ***************** Read *****************
+
+        /* gets a single child in/out status.
+         * INPUT Child
+         * OUTPUT string "in" or "out".
+         */
+        internal string GetChildSignInOut(Child child_in)
+        {
+            using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
+            {
+                //Select only the latest attendence data for this student.
+                string strQuery = "SELECT in_out FROM Attendence WHERE child_id=@id AND id = (SELECT MAX(id) FROM Attendence WHERE child_id = @id)";
+
+                string output = cnn.Query<string>(strQuery, child_in).SingleOrDefault();
+                return output;
+            }
+        }
+        // ***************** Update *****************
+
+        // ***************** Delete *****************
         #endregion
 
         #region misc
-        #endregion
+        // ***************** Create *****************
+        // ***************** Read *******************
 
         /* Checks to see if this is the first time the application has run.
          * by counting the number of guardians in the guardian table.
@@ -93,8 +156,15 @@ WHERE Guardians.id = @id
                     return true;
             }
         }
+        // ***************** Update *****************
+        // ***************** Delete *****************
+        #endregion
 
         #region reports
+        // ***************** Create *****************
+        // ***************** Read *******************
+        // ***************** Update *****************
+        // ***************** Delete *****************
         #endregion
 
         private static string LoadConnectionString(string id = "Default")