TEXT值

Question

做SQLite數據庫使用像TEXT值的輕量級的模式什麼。如果我反覆使用列中的幾個不同的簡短TEXT值，用整數替換它們會更好嗎？

Answer 1

的SQLite存儲文本列的每個副本分別：

$ sqlite3 pancakes.sqlt 
sqlite> create table pancakes (s text); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 
sqlite> insert into pancakes (s) values ('where is pancakes house?'); 

$ strings pancakes.sqlt 
SQLite format 3 
Itablepancakespancakes 
CREATE TABLE pancakes (s text) 
=where is pancakes house? 
=where is pancakes house? 
=where is pancakes house? 
=where is pancakes house? 
=where is pancakes house? 
=where is pancakes house? 
=where is pancakes house? 
=where is pancakes house? 

所以，如果你想避免重複你的字符串，你應該使用整數，建立一個單獨的表到你的整數映射到字符串，然後添加一個foreign key到這個新表，這樣就可以確保參照完整性。