add comments on Database part

src/main/java/ch/hevs/isi/db/DatabaseConnector.java

@@ -6,7 +6,6 @@ import ch.hevs.isi.core.DataPoint;
 import ch.hevs.isi.core.DataPointListener;
 import ch.hevs.isi.core.FloatDataPoint;
 import ch.hevs.isi.utils.Utility;
-
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.OutputStreamWriter;
@@ -19,7 +18,7 @@ import java.util.Properties;
 
 
 public class DatabaseConnector implements DataPointListener {
-    private final Properties properties = new Properties();           // Properties of the config.properties file
+    private final Properties properties = new Properties();     // Properties of the config.properties file
     private URL urlForWrite = null;                             // URL of the InfluxDB server
     private HttpURLConnection con = null;                       // Connection to the InfluxDB server
     private boolean initialized = false;                        // Boolean to know if the database connector is initialized
@@ -124,8 +123,8 @@ public class DatabaseConnector implements DataPointListener {
     }
 
     /**
-     * Push the data point to the database
-     * @param dp Data point to push
+     * Add the timestamp to the data point
+     * @param dp Data point to add the timestamp
      */
     private void pushToDatabase(DataPoint dp) {
         // Initialize the database connector if not already done
@@ -142,6 +141,12 @@ public class DatabaseConnector implements DataPointListener {
         sendDataToDatabase(data);
     }
 
+    /**
+     * Create and formate the request to send to the database
+     * Send the request to the database
+     * Check if the data is correctly send to the database with the response code
+     * @param data Data to send to the database
+     */
     private void sendDataToDatabase(String data){
         try {
             // Create connection and set headers