/* Defining a query using lambda function to search specific key
*/
public void key_value_search(DBEngine<int, DBElement<int, string>> db, IQuery<int, DBElement<int, string>> i_query, QueryEngine<int, DBElement<int, string>> qe )
{
"Query for value with specified key (key = 2):".title();
WriteLine();
int key_to_search = 2;
Func<int, string, bool> keyValueSearch = (int key, string search) => //lambda function
{
if (!db.Keys().Contains(key))
return false;
else
{
if (key == int.Parse(search))
{
DBElement<int, string> ele = new DBElement<int, string>();
db.getValue(key, out ele);
return true;
}
else { return false; }
}
};
// pass query to query engine and call simpleQuery to make query on DBEngine
qe.simpleQuery(keyValueSearch, key_to_search.ToString(), out i_query);
WriteLine();
foreach (var key in i_query.Keys())
{
DBElement<int, string> temp = new DBElement<int, string>();
i_query.getValue(key, out temp);
WriteLine("key : {0}", key);
temp.showElement();
WriteLine();
}
}
/* Defining a query using lambda function to search specific key
*/
public bool key_value_search(DBEngine<string, DBElement<string, List<string>>> db, out IQuery<string, DBElement<string, List<string>>> i_query, QueryEngine<string, DBElement<string, List<string>>> qe, string key_to_search = "12345")
{
"Query for value with specified key (key = element2):".title();
WriteLine();
Func<string, string, bool> keyValueSearch = (string key, string search) => //lambda function
{
if (!db.Keys().Contains(key))
return false;
else
{
if (key == (search))
{
DBElement<string, List<string>> ele = new DBElement<string, List<string>>();
db.getValue(key, out ele);
return true;
}
else { return false; }
}
};
// pass query to query engine and call simpleQuery to make query on DBEngine
if (qe.simpleQuery(keyValueSearch, key_to_search.ToString(), out i_query))
{
WriteLine();
foreach (var key in i_query.Keys())
{
DBElement<string, List<string>> temp = new DBElement<string, List<string>>();
i_query.getValue(key, out temp);
WriteLine("key : {0}", key);
temp.showEnumerableElement();
WriteLine();
}
return true;
}
else
{
return false;
}
}
/* Defining a query using lambda function to search specific elements belonging in specific
* time-interval with end of time interval equal to present
*/
public void date_time_specific(DBEngine<string, DBElement<string, List<string>>> db, out IQuery<string, DBElement<string, List<string>>> i_query, QueryEngine<string, DBElement<string, List<string>>> qe, DateTime start, DateTime end = new DateTime())
{
"Query for keys with specified date time interval: start=10/4/2015 end=10/5/2015".title();
WriteLine();
Func<string, DateTime, DateTime, bool> TimeDateQuery = (string key, DateTime query_start, DateTime query_end) => //lambda function
{
if (!db.Keys().Contains(key))
return false;
else
{
DBElement<string, List<string>> ele = new DBElement<string, List<string>>();
db.getValue(key, out ele);
int start_result = DateTime.Compare(query_start, ele.timeStamp);
int end_result = DateTime.Compare(query_end, ele.timeStamp);
if ((start_result <= 0) && (end_result >= 0))
{
return true;
}
else return false;
}
};
// pass query to query engine and call simpleQuery to make query on DBEngine
qe.simpleQueryDate(TimeDateQuery, out i_query, start, end);
WriteLine();
foreach (var key in i_query.Keys())
{
DBElement<string, List<string>> temp = new DBElement<string, List<string>>();
i_query.getValue(key, out temp);
WriteLine("key : {0}", key);
temp.showEnumerableElement();
WriteLine();
}
}
/* Defining a query using lambda function to search specific string in metadata
*/
public bool metadata_string(DBEngine<string, DBElement<string, List<string>>> db, out IQuery<string, DBElement<string, List<string>>> i_query, QueryEngine<string, DBElement<string, List<string>>> qe, string metadata_str = "ele")
{
"Query for specified string in metadata: String = 'ele' ".title();
WriteLine();
Func<string, string, bool> stringMetadata = (string key, string search) => //lambda function
{
if (!db.Keys().Contains(key))
return false;
else
{
DBElement<string, List<string>> ele = new DBElement<string, List<string>>();
db.getValue(key, out ele);
if (ele.name.Contains(search) || ele.descr.Contains(search))
return true;
else return false;
}
};
// pass query to query engine and call simpleQuery to make query on DBEngine
if (qe.simpleQuery(stringMetadata, metadata_str, out i_query))
{
WriteLine();
foreach (var key in i_query.Keys())
{
DBElement<string, List<string>> temp = new DBElement<string, List<string>>();
i_query.getValue(key, out temp);
WriteLine("key : {0}", key);
temp.showEnumerableElement();
WriteLine();
}
return true;
} else
{
return false;
}
}
/* Defining a query using lambda function to search specific key matching default pattern
*/
public void default_pattern_matching(DBEngine<string, DBElement<string, List<string>>> db, out IQuery<string, DBElement<string, List<string>>> i_query, QueryEngine<string, DBElement<string, List<string>>> qe)
{
string pattern = "";
"Query for keys matching with specified pattern (pattern = none -> default case):".title();
WriteLine();
Func<string, string, bool> keysMatchingPattern = (string key, string search) => //lambda function
{
if (!db.Keys().Contains(key))
return false;
else
{
if (key.ToString().Contains(search))
{
DBElement<string, List<string>> ele = new DBElement<string, List<string>>();
db.getValue(key, out ele);
return true;
}
else return false;
}
};
// pass query to query engine and call simpleQuery to make query on DBEngine
qe.simpleQuery(keysMatchingPattern, pattern, out i_query);
WriteLine();
foreach (var key in i_query.Keys())
{
DBElement<string, List<string>> temp = new DBElement<string, List<string>>();
i_query.getValue(key, out temp);
WriteLine("key : {0}", key);
temp.showEnumerableElement();
WriteLine();
}
}
private void display_children(IQuery<string, DBElement<string, List<string>>> i_query, DBEngine<string, DBElement<string, List<string>>> db)
{
foreach (var key in i_query.Keys())
{
DBElement<string, List<string>> temp = new DBElement<string, List<string>>();
i_query.getValue(key, out temp);
WriteLine("children of element with key {0} :", key);
WriteLine();
if (temp.children != null)
{
int i = 0;
foreach (string child in temp.children)
{
WriteLine("Children {0}", ++i);
DBElement<string, List<string>> temp_child = new DBElement<string, List<string>>();
if (db.Keys().Contains(child))
{
db.getValue(child, out temp_child);
WriteLine("key : {0}", child);
temp_child.showEnumerableElement();
WriteLine();
}
else
{
WriteLine("no value with key {0} is present in database", child);
WriteLine();
}
}
}
}
}
/* Defining a query using lambda function to search children of specific element
*/
public void key_children_search(DBEngine<int, DBElement<int, string>> db, IQuery<int, DBElement<int, string>> i_query, QueryEngine<int, DBElement<int, string>> qe)
{
int specific_key = 2;
"Query for children of specified key (key = 2):".title();
WriteLine();
Func<int, string, bool> childrenQuery = (int key, string search) => //lambda function
{
if (!db.Keys().Contains(key))
return false;
if (key == int.Parse(search))
{
DBElement<int, string> ele = new DBElement<int, string>();
db.getValue(key, out ele);
return true;
}
else return false;
};
// pass query to query engine and call simpleQuery to make query on DBEngine
qe.simpleQuery(childrenQuery, specific_key.ToString(), out i_query);
WriteLine();
foreach (var key in i_query.Keys())
{
DBElement<int, string> temp = new DBElement<int, string>();
i_query.getValue(key, out temp);
WriteLine("children of element with key {0} :", key);
WriteLine();
if (temp.children != null)
{
int i = 0;
foreach (int child in temp.children)
{
WriteLine("Children {0}", i++);
DBElement<int, string> temp_child = new DBElement<int, string>();
if (db.Keys().Contains(child))
{
db.getValue(child, out temp_child);
WriteLine("key : {0}", child);
temp_child.showElement();
WriteLine();
}
else
{
WriteLine("no value with key {0} is present in database", child);
WriteLine();
}
}
}
}
}