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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-11838" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-947a850d-25a7-4b22-ab5f-f5b9ee61587b" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11838" style="color: #3b73af; text-decoration: none">HHH-11838</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-11838" style="color: #3b73af; text-decoration: none">Id retrieving from proxy with FK leads to query execution</a> </span> </td>
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<th style="color: #707070; font: normal 14px/20px Arial, sans-serif; text-align: left; vertical-align: top; padding: 2px 0">Change By:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="ihor.dmitriiev" id="email_ihor.dmitriiev" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=ihor.dmitriiev" style="color:#6c797f;; color: #3b73af; text-decoration: none">Igor Dmitriev</a> </td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <span class="diffcontext">I think it does not make sense to execute query and load full entity if I just need to fetch id of proxy object and this proxy has FK id. <br>I have Client and Account entities.<br>Account table has a FK on Client. (id_client)<br>relationship - one-to-many:<br><br>{code}<br>@Entity<br>class Client {<br> @OneToMany(mappedBy="client")<br> private List<Account> accounts;<br>}<br><br>@Entity<br>class Account {<br> @JoinColumn(name = "id_client")<br> @ManyToOne(fetch = FetchType.LAZY)<br> private Client client;<br>} <br><br>{code}<br><br>{code}<br>Account account = em.find(Account.class, 2);<br>account.getClient().getId();<br>{code}<br><br><br>console output:<br>{code}<br>Hibernate: <br> select<br> account0_.id_account as id_accou1_0_0_,<br> account0_.AMOUNT as AMOUNT2_0_0_,<br> account0_.id_client as id_clien3_0_0_ <br> from<br> ACCOUNT account0_ <br> where<br> account0_.id_account=2<br>Hibernate: <br> select<br> client0_.ID_CLIENT as ID_CLIEN1_4_0_,<br> client0_.age as age2_4_0_,<br> client0_.create_date as create_d3_4_0_,<br> client0_.modify_date as modify_d4_4_0_,<br> client0_.NAME as NAME5_4_0_,<br> client0_.vip as vip6_4_0_ <br> from<br> client client0_ <br> where<br> client0_.ID_CLIENT=1 <br>{code}<br><br>There is id_client column in Account table<br>{code}<br>id_account | amount | id_client<br>{code}<br>Account object has javassist proxy client object, that proxy client has JavassistLazyInitializer handler field and there is id field. Take a look at attached file.<br><br>Why don't just retrieve that id from handler object??? It would be great performance optimization I suppose, cause very often just id is needed<br><br>P.S.: the same stuff is for load method:<br>{code}<br>Client client = em.unwrap(Session.class).load(Client.class, 1); // - proxy<br>client.getId(); //</span> <span class="diffaddedchars" style="background-color:#ddfade;"> -</span> <span class="diffcontext"> sql query to get client from db<br>{code}<br></span> </td>
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