new documentations made.

server/web-data-connection/generalDatabaseFile.md

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+## General node file.
+The general node file includes the database connecting and a node connection class.
+This is done so the files don't go back and forth with the db connection, this otherwise would have caused problems.
+```py
+#importing a database library to connect to the database.
+import mysql.connector
+
+def dbLogin():
+    mydb = mysql.connector.connect(
+        host="localhost",
+        user="root",
+        password="**********",
+        database="NodeData" 
+    )
+    return mydb
+# A general class which acts as a database connector and a node identifyer
+class Node():
+    
+    def __init__(self, macAdress):
+        self.macAdress = macAdress
+        self.id = None
+
+    def getNodeId(self):
+        id = (self.macAdress,)
+        mydb = dbLogin()
+        cursor = mydb.cursor()
+        cursor.execute("""SELECT nodeID FROM Node WHERE MAC = %s""", id)
+        data = cursor.fetchall()
+        #again go along all tuple items. and asign them to the ID
+        for tuples in data:
+            for item in tuples:
+                self.id = item
+```