public void persistdb <Key, Value, Data>(DBEngine <Key, Value> db)
{
XDocument xml = new XDocument();
xml.Declaration = new XDeclaration("1.0", "utf-8", "yes");
XComment comment = new XComment("NoSQL Database"); //title for XML
xml.Add(comment);
XElement NoSQLelem = new XElement("NoSQLDB_ELEMENTS");
XElement type = new XElement("numbers", typeof(Key));
XElement payload = new XElement("name", typeof(Data));
xml.Add(NoSQLelem);
NoSQLelem.Add(type);
NoSQLelem.Add(payload);
foreach (Key k1 in db.Keys())
{
XElement tags = new XElement("open_close");
XElement key = new XElement("new_Key", k1); //tag for new keys generated
tags.Add(key);
Value value1;
db.getValue(k1, out value1);
DBElement <Key, Data> element = value1 as DBElement <Key, Data>;
WriteLine(element.showElement());
XElement dbelement = persistdbelement <Key, Data>(element);
tags.Add(dbelement);
NoSQLelem.Add(tags);
xml.Save("XML_FILE_PROJECT4.xml"); //XML file name
}
}
{ // Function to perform addition of relationships
public static bool addRelations <Key, Value, Data>(this DBEngine <Key, Value> dbedit, Key key1, Key key2)
{
Value val1, val2;
bool key1_present = dbedit.getValue(key1, out val1);
// check if key1 is present
if (key1_present)
{
bool key2_present = dbedit.getValue(key2, out val2);
// check if key2 is present
if (key2_present)
{
DBElement <Key, Data> element = val1 as DBElement <Key, Data>;
element.children.Add(key1);
}
}
return(true);
}
//----< write simple db elements out to Console >------------------
public static void show <Key, Value, Data>(this DBEngine <Key, Value> db)
{
foreach (Key key in db.Keys())
{
Value value;
db.getValue(key, out value);
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
Write("\n\n -- key = {0} --", key);
Write(elem.showElement());
}
}
// function to perform removal of relationships
public static bool removeRelation <Key, Value, Data>(this DBEngine <Key, Value> dbedit, Key key1, Key key2)
{
Value value;
if (dbedit.getValue(key1, out value))
{
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
if (elem.children.Contains(key2))
{
elem.children.Remove(key2);
}
}
return(true);
}
// Function to perform editing of name in metedata
public static bool editName <Key, Value, Data>(this DBEngine <Key, Value> dbedit, Key key1, string new_name)
{
Value value;
if (dbedit.getValue(key1, out value))
{
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
elem.name = new_name;
return(true);
}
else
{
return(false);
}
}
// function to edit instances
public static bool editInstance <Key, Value, Data>(this DBEngine <Key, Value> dbedit, Key key1, Data new_instance)
{
Value value;
if (dbedit.getValue(key1, out value))
{
DBElement <Key, Data> elem = value as DBElement <Key, Data>;
elem.payload = new_instance;
return(true);
}
else
{
return(false);
}
}
public Value queryvalue <Key, Value, Data>(DBEngine <Key, Value> db, Key key)
{
Value getqueryvalue;
bool key_present = db.getValue(key, out getqueryvalue);
if (key_present) // check if key is present
{
return(getqueryvalue); //if present return value
}
else
{
Console.WriteLine("key not present"); // else error message
}
return(default(Value));
}
public List <key> querychildren <key, value, Data>(DBEngine <key, value> db, key Key)
{
value getqueryvalue;
bool key_present = db.getValue(Key, out getqueryvalue); // check if key present
DBElement <key, Data> temp = getqueryvalue as DBElement <key, Data>; // create new element to store value
if (key_present)
{
return(temp.children);
}
else
{
Console.WriteLine("invalid key"); // if key not present error message
}
return(null);
}
