How to Use the MySQL Assign Operator in Hibernate Native Queries?

Using the MySQL Assign Operator in Hibernate Native Queries

In Hibernate, when using native queries that involve the MySQL assign operator(:=), developers may encounter errors such as "Space is not allowed after parameter prefix :". This issue arises due to limitations in Hibernate's handling of the assign operator.

To resolve this issue, the affect user must:

Escape the Assign Operator

As mentioned in the issue report HHH-2697, Hibernate now supports escaping the assign operator using a backslash. By modifying the native query to:

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

The exception should no longer occur.

Upgrade Hibernate Version

Additionally, updating to Hibernate version 4.1.3 or later will resolve this issue as the fix for HHH-2697 has been incorporated into these versions.

By employing either of these solutions, developers can successfully use the MySQL assign operator in their Hibernate native queries without encountering errors.

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