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From "Simone Gianni (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-740) In MySQL use LONGBLOB, MEDIUMBLOB etc.. when needed, cause BLOB only holds 64kb of data.
Date Tue, 07 Oct 2008 22:16:45 GMT
In MySQL use LONGBLOB, MEDIUMBLOB etc.. when needed, cause BLOB only holds 64kb of data.
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                 Key: OPENJPA-740
                 URL: https://issues.apache.org/jira/browse/OPENJPA-740
             Project: OpenJPA
          Issue Type: Improvement
          Components: sql
    Affects Versions: 1.2.0
            Reporter: Simone Gianni


When a column is annotated as a BLOB of using @Persistent to use streaming blobs, and the
underlying database is MySQL, OpenJPA will create a column of type BLOB. Unfortunately, in
MySQL a BLOB column can hold a (vary) limited amount of data, while (especially when using
streaming blobs) the user would probably expect it to hold a large amount of data.

Also adding the @Column annotation and specifying a size bigger than what a BLOB column in
MySQL can hold, OpenJPA still creates only a BLOB column.

I think OpenJPA should be able to create the proper column type depending on the @Column annotation
if present, or otherwise default at least to a MEDIUMBLOB to preserve cross-database compatibility
as expected.

The simplest patch i can think of is setting blobTypeName="MEDIUMBLOB" in the MySQLDictionary
constructor.

Otherwise, overriding the getTypeName to properly parse the length and return the correct
BLOB/TEXT type for mysql.

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