sqlite数据库中的TEXT值

Question

sqlite数据库是否对TEXT值使用类似flyweight模式的内容。如果我在列中重复使用几个不同的短TEXT值，用整数替换它们会更好吗？

Answer 1

SQLite分别存储文本列的每个副本：

$ 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?

因此，如果要避免重复字符串，则应使用整数，设置单独的表以将整数映射到字符串，然后将foreign key添加到此新表中，以便确保参照完整性。