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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-11375" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-ce34acd7-a2ba-4475-85ca-89b35e41dddd" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-11375" style="color: #3b73af; text-decoration: none">HHH-11375</a> </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-avatar-ce34acd7-a2ba-4475-85ca-89b35e41dddd" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"> Bug </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 5.2.6 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Unassigned </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> hibernate-core </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">Created:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 09/Jan/2017 05:12 AM </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">Environment:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> Java 1.8.0_91 <br> MySQL 5.7.16 <br> Tomcat 8.0.39 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> core hibernate </td>
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<td class="has-icon" style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <img src="cid:jira-generated-image-static-blocker-1e6af6c0-e65b-40e3-a95d-a058ec94febc" height="16" width="16" border="0" align="absmiddle" alt="Blocker" style="vertical-align: text-bottom"> Blocker </td>
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<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="CodePlayer" id="email_CodePlayer" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=CodePlayer" style="color:#6c797f;; color: #3b73af; text-decoration: none">Ready</a> </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">Original Estimate:</th>
<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">56h</td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top">56h</td>
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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">Sorry for my poor English.<br> There are 3 objects: PostTable, Post and Category. <br> Post and Category both extends PostTable . PostTable represents the data table named "cp_table". The "type" field is the DiscriminatorColumn of table, data type is integer.<br> The Category entity's DiscriminatorValue is "1", the Post's is "2".<br> The code outlines of them as below:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
@Entity
@Table(name = <span class="code-quote" style="color: #009100">"cp_post"</span>)
@Inheritance(strategy = InheritanceType.SINGLE_TABLE)
@DiscriminatorColumn(name = <span class="code-quote" style="color: #009100">"type"</span>, discriminatorType = DiscriminatorType.INTEGER)
<span class="code-keyword" style="color: #000091">public</span> class PostTable {
<span class="code-comment" style="color: #808080">// ignore getters and setters
</span> @Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">Integer</span> id;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> title;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> alias;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> keyword;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> summary;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> author;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> source;
<span class="code-keyword" style="color: #000091">protected</span> Date updateTime;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> content;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">Integer</span> hits;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">Integer</span> postOrder;
@ManyToOne(fetch = FetchType.LAZY)
@JoinColumn(nullable = <span class="code-keyword" style="color: #000091">false</span>)
<span class="code-keyword" style="color: #000091">protected</span> User user;
<span class="code-keyword" style="color: #000091">protected</span> Date addTime;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">Integer</span> status;
<span class="code-keyword" style="color: #000091">protected</span> <span class="code-object" style="color: #910091">String</span> image;
}
@Entity
@DiscriminatorValue(<span class="code-quote" style="color: #009100">"1"</span>)
<span class="code-keyword" style="color: #000091">public</span> class Category <span class="code-keyword" style="color: #000091">extends</span> PostTable {
<span class="code-comment" style="color: #808080">// ignore getters and setters
</span> @ManyToOne(fetch = FetchType.LAZY)
@JoinColumn
<span class="code-keyword" style="color: #000091">protected</span> Category category;
@OneToMany(fetch = FetchType.LAZY, mappedBy = <span class="code-quote" style="color: #009100">"category"</span>)
@OrderBy(<span class="code-quote" style="color: #009100">"postOrder ASC"</span>)
<span class="code-keyword" style="color: #000091">protected</span> List<Category> children;
}
@Entity
@DiscriminatorValue(<span class="code-quote" style="color: #009100">"2"</span>)
<span class="code-keyword" style="color: #000091">public</span> class Post <span class="code-keyword" style="color: #000091">extends</span> PostTable {
<span class="code-comment" style="color: #808080">// ignore getters and setters
</span> @ManyToOne(fetch = FetchType.LAZY)
@JoinColumn
<span class="code-keyword" style="color: #000091">protected</span> Category category;
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, when I invoke Category Entity's getChildren() method to gain the associated Collection of Category, I found that the collection contains the Post entity ( which's type = "2") unexpectedly !</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The java code as blow:</p>
<div class="code panel" style="border-width: 1px;; border: 1px solid #cccccc; background: #f5f5f5; font-size: 12px; line-height: 1.333; font-family: monospace; border: 1px solid #cccccc; -moz-border-radius: 3px; border-radius: 3px; margin: 9px 0">
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
Category category = hibernateDao.get(Category.class, 7);
List<Category> children = category.getChildren();
<span class="code-keyword" style="color: #000091">for</span> (Category child : children) {
<span class="code-object" style="color: #910091">System</span>.out.println(child.getId());
}
</pre>
</div>
</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The corresponding SQL statement as blow:<br> "<br> SELECT<br> children0_.category_id AS categor17_38_1_,<br> children0_.id AS id2_38_1_,<br> children0_.id AS id2_38_0_,<br> children0_.add_time AS add_time3_38_0_,<br> children0_.alias AS alias4_38_0_,<br> children0_.author AS author5_38_0_,<br> children0_.content AS content6_38_0_,<br> children0_.hits AS hits7_38_0_,<br> children0_.image AS image8_38_0_,<br> children0_.keyword AS keyword9_38_0_,<br> children0_.post_order AS post_or10_38_0_,<br> children0_.source AS source11_38_0_,<br> children0_. STATUS AS status12_38_0_,<br> children0_.summary AS summary13_38_0_,<br> children0_.title AS title14_38_0_,<br> children0_.update_time AS update_15_38_0_,<br> children0_.user_id AS user_id16_38_0_,<br> children0_.category_id AS categor17_38_0_<br> FROM<br> cp_post children0_<br> WHERE<br> children0_.category_id =?<br> ORDER BY<br> children0_.post_order ASC<br> "</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">However, the expected query should add type restriction. e.g. " AND children0_.type = 1" .<br> Because the definition of Category entity is "type = 1", it should be treated strictly in anywhere.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Additionally. the Hibernate version I'm using is 5.2.6 Final. I've no enough time to test for each version.<br> Best wishes.</p> </td>
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