我可以在mysql数据库列中存储ruby哈希吗

Question

I want to insert hashes like below into a mysql column,

{:sub => ["at","div.product-info"],
     1 => [["at","span#hs18Price"]],
     :avail => ["at","strong.out_stock"],
     :soffer =>  ["at","div.freebie"], 
     :stime =>["search","div[@class='costs']//span[@class='days']"],
     :scost => [300,30] }

I tried, its throwing the following error,

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'costs...

Any help?

EDIT:

Forget active record and serialization. I want to do it in a raw sql.

Answer 1

您需要对哈希中的单引号进行转义

Answer 2

If you want to store Hash inside column in MySQL (or any other database supported by AR*) you have to:

1) define column as text

add_column :users, :the_whatever, :text

2) define serialization of column so that ActiveRecord knows what to do with you data. You do this by setting serialize option to model.

serialize :the_whatever, Hash

* Some databases (like PostgreSQL) also provide some other types more suited for storing Hashes. See Railscasts Hstore .

Answer 3

如果您愿意切换数据库：PostreSQL为此提供了hstore 。

Answer 4

Your sql column must be of type text . You might need to serialize your hash first too.