数据库本地化

Question

如果以下问题可能有更好/不同/共同的解决方案,我正在寻找意见:

---

我有一个产品数据库,其中包含英文产品的名称(本应用程序的默认语言),我需要翻译名称(如果有的话).

目前我有这个设置:

产品表

CREATE TABLE products
(
  id serial NOT NULL,
  "name" character varying(255) NOT NULL,
  CONSTRAINT products_pkey PRIMARY KEY (id)
)

和产品本地化表

CREATE TABLE products_l10n
(
  product_id serial NOT NULL,
  "language" character(2) NOT NULL,
  "name" character varying(255) NOT NULL,
  CONSTRAINT products_l10n_pkey PRIMARY KEY (product_id, language),
  CONSTRAINT products_l10n_product_id_fkey FOREIGN KEY (product_id)
      REFERENCES products (id) MATCH SIMPLE
      ON UPDATE CASCADE ON DELETE CASCADE
)

我使用以下查询来检索本地化产品的列表(在这种情况下为德语),并回退到默认的英文名称:

SELECT p.id, COALESCE(pl.name, p.name) 
from products p LEFT 
JOIN products_l10n pl ON p.id = pl.product_id AND language = 'de';

SQL代码是postgres方言.数据存储为UTF-8.

Answer 1

在我看来很好.我可能改变的一件事是你处理语言的方式:这应该是一个单独的表.因此,您将拥有:

CREATE TABLE products_l10n
(
  product_id serial NOT NULL,
  language_id int NOT NULL,
  "name" character varying(255) NOT NULL,
  CONSTRAINT products_l10n_pkey PRIMARY KEY (product_id, language),
  CONSTRAINT products_l10n_product_id_fkey FOREIGN KEY (product_id)
      REFERENCES products (id) MATCH SIMPLE
      ON UPDATE CASCADE ON DELETE CASCADE
  CONSTRAINT products_l10n_language_id_fkey FOREIGN KEY (language_id)
      REFERENCES languages (id) MATCH SIMPLE
      ON UPDATE CASCADE ON DELETE CASCADE
)

CREATE TABLE languages
)
  id serial not null
  "language" character(2) NOT NULL
)

除此之外,我认为你已经得到了最好的解决方案.