How to Use MySQL\'s Assignment Operator (:=) in Hibernate Native Queries?

Using the MySQL Assignment Operator (=:) in Hibernate Native Queries

When working with MySQL native queries in Hibernate, leveraging subselect statements is often necessary. However, when using the MySQL assignment operator (:=) in these queries, you may encounter the exception "Space is not allowed after parameter prefix ':'."

This issue stems from Hibernate's restriction of white space after parameter prefixes. However, a solution exists for this specific case.

Fix for HHH-2697

In Hibernate versions prior to 4.1.3, there was no workaround for this issue. However, the bug HHH-2697 has been fixed in later releases.

For Hibernate 4.1.3 and above, you can escape the assignment operator with a backslash (). By doing so, you can use the following modified query:

<code class="sql">SELECT k.`news_master_id` AS id, @row \:= @row + 1 AS rownum 
FROM keyword_news_list k 
JOIN (SELECT @row \:= 0) r 
WHERE k.`keyword_news_id` = :kid
ORDER BY k.`news_master_id` ASC</code>

This escaped syntax allows you to use the assignment operator in your native queries without encountering the aforementioned exception.

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