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POhibernate: how to fetch child collection at the time of parent
 

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  1. POhibernate: how to fetch child collection at the time of parent
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    <p>I have casemaster(DLawCaseMaster - parent) class and casemaster history (DLawCaseMasterH - child) class. I have situation where I need parent and child collection both.</p> <p>DLawCaseMaster.java</p> <pre><code>public class DLawCaseMaster implements java.io.Serializable { //..... private Set&lt;DLawCaseMasterH&gt; DLawCaseMasterHs = new HashSet&lt;DLawCaseMasterH&gt;(0); //..... public Set&lt;DLawCaseMasterH&gt; getDLawCaseMasterHs() { return this.DLawCaseMasterHs; } public void setDLawCaseMasterHs(Set&lt;DLawCaseMasterH&gt; DLawCaseMasterHs) { this.DLawCaseMasterHs = DLawCaseMasterHs; } } </code></pre> <p>DLawCaseMaster.hbm.xml</p> <pre><code>&lt;set inverse="true" name="DLawCaseMasterHs"&gt; &lt;key&gt; &lt;column name="CASE_ID" not-null="true"/&gt; &lt;/key&gt; &lt;one-to-many class="com.law.beans.DLawCaseMasterH"/&gt; &lt;/set&gt; </code></pre> <p>DLawCaseMasterH.java</p> <pre><code>public class DLawCaseMasterH implements java.io.Serializable { private DLawCaseMasterHId id; private DLawCaseMaster DLawCaseMaster; public void setId(DLawCaseMasterHId id) { this.id = id; } public DLawCaseMaster getDLawCaseMaster() { return this.DLawCaseMaster; } public DLawCaseMaster getDLawCaseMaster() { return this.DLawCaseMaster; } public void setDLawCaseMaster(DLawCaseMaster DLawCaseMaster) { this.DLawCaseMaster = DLawCaseMaster; } } </code></pre> <p>DLawCaseMasterH.hbm.xml</p> <pre><code>&lt;composite-id class="com.law.beans.DLawCaseMasterHId" name="id"&gt; &lt;key-property name="historyId" type="long"&gt; &lt;column name="HISTORY_ID"/&gt; &lt;/key-property&gt; &lt;key-property name="caseId" type="long"&gt; &lt;column name="CASE_ID"/&gt; &lt;/key-property&gt; &lt;/composite-id&gt; &lt;many-to-one class="com.law.beans.DLawCaseMaster" fetch="select" insert="false" name="DLawCaseMaster" update="false"&gt; &lt;column name="CASE_ID" not-null="true"/&gt; &lt;/many-to-one&gt; </code></pre> <p>I have tried following strategy but each time it returns blank list.</p> <pre><code>public static List&lt;DLawCaseMaster&gt; getCaseListWithHistory(long userID, Date asOnDate, Date fromDate, Date toDate) { List&lt;DLawCaseMaster&gt; list = new ArrayList&lt;DLawCaseMaster&gt;(); Session session = null; Transaction tx = null; try { session = HibernateUtil.getSessionFactory().openSession(); tx = session.beginTransaction(); Criteria criteria = session.createCriteria(DLawCaseMaster.class); criteria.add(Restrictions.isNull("disposalDate")); if (asOnDate == null) { criteria.add(Restrictions.between("disposalDate", fromDate, toDate)); } else { criteria.add(Restrictions.eq("disposalDate", asOnDate)); } criteria.setFetchMode("DLawUserMaster", FetchMode.JOIN).add(Restrictions.eq("DLawUserMaster.userId", userID)); criteria.setFetchMode("DLawAdvocateMaster", FetchMode.JOIN).add(Restrictions.eq("DLawUserMaster.userId", userID)); criteria.setFetchMode("DLawCourtMaster", FetchMode.JOIN).add(Restrictions.eq("DLawUserMaster.userId", userID)); criteria.setFetchMode("DLawClientMaster", FetchMode.JOIN).add(Restrictions.eq("DLawUserMaster.userId", userID)); criteria.setFetchMode("DLawCaseTypeMaster", FetchMode.JOIN).add(Restrictions.eq("DLawUserMaster.userId", userID)); criteria.setFetchMode("DLawStageMaster", FetchMode.JOIN).add(Restrictions.eq("DLawUserMaster.userId", userID)); // PROBLEM LINE HERE criteria.createCriteria("DLawCaseMasterHs").add(Restrictions.eq("DLawUserMaster.userId", userID)); // PROBLEM LINE HERE criteria.addOrder(Order.desc("caseId")); list = criteria.list(); tx.commit(); } catch (Exception e) { System.out.println("Exception Message : " + e.getMessage()); if (tx != null) { tx.rollback(); } return list; } finally { session.close(); } return list; } </code></pre> <p>If I remove <strong>PROBLEM LINE HERE</strong> it will return list with 3 records but when access DLawCaseMasterHs it throws an exception. In short it does not have any data.</p> <p>Can any one guide me to fetch children while fetching parent... Thanks in advance.</p>
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