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PORetrieving i18n data with fallback language
 

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  1. PORetrieving i18n data with fallback language
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    <p>I have to grab i18n text from a database. The default language is English, it has text for <em>everything</em>. But the non-English languages doesn't necessarily have all the desired translations. If a non-English translation for a certain entity/key isn't available in the DB, then I'd like to have it to return the English text instead. So, English is the <em>fallback</em> language here.</p> <p>The i18n text table look like so (PostgreSQL dialect):</p> <pre><code>CREATE TABLE translation ( id SERIAL PRIMARY KEY, language_code CHAR(2) NOT NULL, key VARCHAR(20) NOT NULL, value TEXT NOT NULL, CONSTRAINT translation_unique UNIQUE (language_code, key) ) </code></pre> <p>The data look like this:</p> <pre><code>INSERT INTO translation (language_code, key, value) VALUES ('en', 'foo', 'foo in English'), ('nl', 'foo', 'foo in Nederlands (Dutch)'), ('en', 'bar', 'bar in English') </code></pre> <p>I'd like to basically do the below pseudo SQL query:</p> <pre><code>SELECT key, value FROM translation WHERE (language_code = 'nl' OR IF value IS NULL THEN language_code = 'en') </code></pre> <p><em>(actually, the <code>'nl'</code> value is to be parameterized)</em></p> <p>So that it returns the following:</p> <pre> +-----+---------------------------+ | key | value | +-----+---------------------------+ | foo | foo in Nederlands (Dutch) | | bar | bar in English | +-----+---------------------------+ </pre> <p>How can I achieve this in a single SQL query?</p> <p>The DB in question is PostgreSQL, but a RDMBS-agnostic way would be nice.</p>
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