command.CommandText="CREATE TABLE Lends (Id INTEGER NOT NULL PRIMARY KEY, ItemId INTEGER NOT NULL, ReturnDate TEXT NOT NULL, Customer TEXT NOT NULL, Returned INTEGER NOT NULL)";
command.ExecuteNonQuery();
command.CommandText="CREATE TABLE Items (ItemId INTEGER NOT NULL PRIMARY KEY, BookId INTEGER NOT NULL)";
command.ExecuteNonQuery();
command.CommandText="CREATE TABLE Books (ProductId INTEGER PRIMARY KEY, Name TEXT, Author TEXT, Country TEXT, Link TEXT, Language TEXT, Pages INTEGER, Year INTEGER, Category INTEGER, ImageLink TEXT, LendTime INTEGER, LendType INTEGER)";