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<a class="user-hover" rel="mabako" id="email_mabako" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=mabako" style="color:#6c797f;">Marcus Bauer</a>
created <img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> <a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7719'>HHH-7719</a>
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<a style='color:#6c797f;text-decoration:none;' href='https://hibernate.onjira.com/browse/HHH-7719'><strong>Changing @ManyToMany <-> @OneToMany doesn't add/remove unique constraint</strong></a>
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<strong style="font-weight:normal;color:#505050;">Issue Type:</strong>
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<img src="https://hibernate.onjira.com/images/icons/bug.gif" height="16" width="16" border="0" align="absmiddle" alt="Bug"> Bug
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<strong style="font-weight:normal;color:#505050;">Affects Versions:</strong>
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4.1.1 </td>
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<strong style="font-weight:normal;color:#505050;">Assignee:</strong>
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Unassigned </td>
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<strong style="font-weight:normal;color:#505050;">Attachments:</strong>
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model.7z </td>
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<strong style="font-weight:normal;color:#505050;">Components:</strong>
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annotations </td>
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<strong style="font-weight:normal;color:#505050;">Created:</strong>
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26/Oct/12 1:57 AM
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<strong style="font-weight:normal;color:#505050;">Description:</strong>
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<p style='margin-top:0;margin-bottom:10px;'>When having a @OneToMany annotation on an entity and later changing that to @ManyToMany, Hibernate does not drop the unique constraint. It simply leaves the constraint intact.</p>
<p style='margin-top:0;margin-bottom:10px;'>Dropping and letting Hibernate regenerate the table does not add the unique constraint (works as expected). This means you'll not be able to insert multiple entries in the table, unless you regenerate it.</p>
<p style='margin-top:0;margin-bottom:10px;'>Created Table thus far:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-sql">CREATE TABLE A_B (
A_id INT NOT NULL,
b_id INT NOT NULL,
CONSTRAINT PK__A_B__B54FFDE90F6D37F0 PRIMARY KEY (A_id, b_id) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = OFF, ALLOW_PAGE_LOCKS = OFF)
)
GO
CREATE UNIQUE INDEX UQ__A_B__4E29C30C1249A49B ON A_B (b_id ASC)
WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = OFF, ALLOW_PAGE_LOCKS = OFF)
GO
)</pre>
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<p style='margin-top:0;margin-bottom:10px;'>Likewise, changing @ManyToMany to @OneToMany will add a unique constraint. Inserting multiple values will however work fine.</p>
<p style='margin-top:0;margin-bottom:10px;'>Re-generating the table will add the constraint just fine.</p>
<p style='margin-top:0;margin-bottom:10px;'>SQL thus far:</p>
<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
<pre class="code-sql">CREATE TABLE A_B (
A_id INT NOT NULL,
b_id INT NOT NULL,
CONSTRAINT PK__A_B__B54FFDE905E3CDB6 PRIMARY KEY (A_id, b_id) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON)
)
GO</pre>
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<p style='margin-top:0;margin-bottom:10px;'>Attached are the pretty basic entities I've used to confirm this behaviour.</p>
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<strong style="font-weight:normal;color:#505050;">Environment:</strong>
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Hibernate 4.1.1, bundled with JBoss AS 7.1.1
<br/>
Microsoft SQL Server 2008
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<strong style="font-weight:normal;color:#505050;">Project:</strong>
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<a style="color:#6c797f;" href="https://hibernate.onjira.com/browse/HHH">Hibernate ORM</a>
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<strong style="font-weight:normal;color:#505050;">Labels:</strong>
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sqlserver
metamodel
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<strong style="font-weight:normal;color:#505050;">Priority:</strong>
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<img src="https://hibernate.onjira.com/images/icons/priority_minor.gif" height="16" width="16" border="0" align="absmiddle" alt="Minor"> Minor
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<strong style="font-weight:normal;color:#505050;">Reporter:</strong>
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<td style="color:#000000;font-family:Arial,FreeSans,Helvetica,sans-serif;font-size:12px;padding:0 0 10px 0;width:100%;">
<a class="user-hover" rel="mabako" id="email_mabako" href="https://hibernate.onjira.com/secure/ViewProfile.jspa?name=mabako" style="color:#6c797f;">Marcus Bauer</a>
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