public bool TryGetValue(string key, [MaybeNullWhen(false)] out string value)
{
if (SQLiteUtility.IsNull(key))
{
throw new ArgumentNullException();
}
else if (!ContainsKey(key))
{
value = default(string);
return(false);
}
else
{
value = this[key];
return(true);
}
}
public bool Remove(string key)
{
if (SQLiteUtility.IsNull(key))
{
throw new ArgumentNullException();
}
if (!ContainsKey(key))
{
return(false);
}
else
{
string commandText = $"DELETE FROM {tableName} WHERE Key = @key";
List <SqliteParameter> parameters = new List <SqliteParameter>();
parameters.Add(new SqliteParameter("@key", key));
SQLiteUtility.ExecuteCommand(connectionString, commandText, parameters);
return(true);
}
}
public void Add(string key, string value)
{
if (SQLiteUtility.IsNull(key))
{
throw new ArgumentNullException();
}
else if (ContainsKey(key))
{
throw new ArgumentException();
}
else
{
string commandText = $"INSERT INTO {tableName} (Key, Value) VALUES (@key, @value)";
List <SqliteParameter> parameters = new List <SqliteParameter>();
parameters.Add(new SqliteParameter("@key", key));
parameters.Add(new SqliteParameter("@value", value));
SQLiteUtility.ExecuteCommand(connectionString, commandText, parameters);
}
}
public bool Remove(KeyValuePair <string, string> item)
{
if (SQLiteUtility.IsNull(item.Key))
{
throw new ArgumentNullException();
}
if (!Contains(item))
{
return(false);
}
else
{
string commandText = $"DELETE FROM {tableName} WHERE Key = @key AND Value = @value";
List <SqliteParameter> parameters = new List <SqliteParameter>();
parameters.Add(new SqliteParameter("@key", item.Key));
parameters.Add(new SqliteParameter("@value", item.Value));
SQLiteUtility.ExecuteCommand(connectionString, commandText, parameters);
return(true);
}
}
public string this[string key]
{
get
{
if (SQLiteUtility.IsNull(key))
{
throw new ArgumentNullException();
}
else if (!ContainsKey(key))
{
throw new KeyNotFoundException();
}
else
{
string query = $"SELECT Value FROM {tableName} WHERE Key = @key";
List <SqliteParameter> parameters = new List <SqliteParameter>();
parameters.Add(new SqliteParameter("@key", key));
return(SQLiteUtility.GetQueryResult(connectionString, query, parameters).Rows[0][0]);
}
}
set
{
if (SQLiteUtility.IsNull(key))
{
throw new ArgumentNullException();
}
else if (!ContainsKey(key))
{
Add(key, value);
}
else
{
string commandText = $"UPDATE TABLE {tableName} SET Value = @value WHERE Key = @key";
List <SqliteParameter> parameters = new List <SqliteParameter>();
parameters.Add(new SqliteParameter("@key", key));
parameters.Add(new SqliteParameter("@value", value));
SQLiteUtility.ExecuteCommand(connectionString, commandText, parameters);
}
}
}