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PODuplicate rows using Hibernate native query with return-join
 

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  1. PODuplicate rows using Hibernate native query with return-join
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    <p>I'm using Hibernate (3.3.x) and I have two entities:</p> <pre><code>public class FtChargeAcctPkgDtl { private FtChargeAcctPkgDtlId id; private Set&lt;FtChargeAcctPkgRate&gt; ftChargeAcctPkgRates; } </code></pre> <p>and</p> <pre><code>public class FtChargeAcctPkgRate { private FtChargeAcctPkgRateId id; } </code></pre> <p>(left other attributes and setters out for simplicity).</p> <p>I have a native query:</p> <pre><code>&lt;sql-query name="readSymbolsFtPackages"&gt; &lt;return alias="pkgDtl" class="somepackage.FtChargeAcctPkgDtl"/&gt; &lt;return-join alias="pkgRate" property="pkgDtl.ftChargeAcctPkgRates"/&gt; &lt;![CDATA[ SELECT {pkgDtl.*}, {pkgRate.*} FROM ft_charge_acct_pkg_dtl pkgDtl JOIN ft_charge_acct_pkg_rate pkgRate ON pkgRate.master_seq_no = pkgDtl.master_seq_no -- just primary key AND pkgRate.pkg_id = pkgDtl.pkg_id ]]&gt; &lt;/sql-query&gt; </code></pre> <p>The query is supposed (I want it to) return one row for every item in pkgDtl, with FtChargeAcctPkgDtl#ftChargeAcctPkgRates filled in. But in fact it returns one row for every item in ft_charge_acct_pkg_rate.</p> <p>Lets say there are 5 rows in the main (pkgDtl) table and 50 in the joined one (average 10 pkgRates for a single pkgDtl). When I invoke the query using</p> <pre><code>Query query = session.getNamedQuery("readSymbolsFtPackages"); query.list(); </code></pre> <p>I get 50 rows. 45 of those are duplicates however. I want to get those 5 pkgDtls and every one with filled in pkdRates. Is there a way to do this in hibernate?</p>
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    1. USOndrej Skalicka
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    1. COUsing select distict wouldnt help? why dont you modify your query to do exactly what you need?
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    2. COHi @Eduard, database distinct won't help as the DATABASE rows are different. But as hibernate transforms the DB rows into a set of java objects, there are duplicities.
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      1. USOndrej Skalicka
 

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