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PORegarding one to one mapping in hibernate
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  1. PORegarding one to one mapping in hibernate
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    copied!<p>I am a new bie to the world of hibernate could you please advise , I was going through one to one relationship in Hibernate, As per my analysis , one to one hibernate relationships can be established by three ways..</p> <pre><code>1)Through Join concept 2)Same primary key in both the tables 3)Primary key and foriegn key relationship in both the tables </code></pre> <p><strong>Please advise , the above three ways to achieve the one to one mapping is correct or I am missing something then please advise, and also please advise that the below hbm mapping files that I am using are correct one.if not then please advise</strong>.</p> <p>1) Through Join concept :-<br> One way to achieve to one to one relationship is by joining concept , following xml is being used for that</p> <pre><code>&lt;hibernate-mapping&gt; &lt;class name="mypack.Person" table="person21"&gt; &lt;id name="personId" type="int"&gt; &lt;generator class="increment"&gt; &lt;/generator&gt; &lt;/id&gt; &lt;property name="name"/&gt; &lt;join table="personAddress"&gt; &lt;key column="personId"/&gt; &lt;many-to-one name="address" class="mypack.Address" column="addressId" unique="true" cascade="all"/&gt; &lt;/join&gt; &lt;/class&gt; &lt;class name="mypack.Address" table="address21"&gt; &lt;id name="id" column="addressId" type="int"&gt; &lt;generator class="increment"/&gt; &lt;/id&gt; &lt;property name="city"/&gt; &lt;property name="state"/&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>2) Same primary key in both the tables :-</p> <p>Using same primary key in both the tables , following hbm is being used for that</p> <pre><code> &lt;class name="mypack.Address" table="address31"&gt; &lt;id name="id" column="addressId" type="int"&gt; &lt;generator class="increment"/&gt; &lt;/id&gt; &lt;property name="city"/&gt; &lt;property name="state"/&gt; &lt;/class&gt; &lt;class name="mypack.Person" table="person31"&gt; &lt;id name="personId" type="int"&gt; &lt;generator class="foreign"&gt; &lt;param name="property"&gt;address&lt;/param&gt; &lt;/generator&gt; &lt;/id&gt; &lt;property name="name"/&gt; &lt;one-to-one name="address" class="mypack.Address"/&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>3)Primary key and foriegn key relationship in both the tables :-</p> <p>Primary key in one table and foriegn key in another table. below is the hbm for this</p> <pre><code>&lt;hibernate-mapping&gt; &lt;class name="mypack.Person"&gt; &lt;id name="personId" type="int"&gt; &lt;generator class="increment"/&gt; &lt;/id&gt; &lt;property name="name"/&gt; &lt;many-to-one name="address" class="mypack.Address" column="addressId" unique="true" cascade="all"/&gt; &lt;/class&gt; &lt;class name="mypack.Address"&gt; &lt;id name="id" column="addressId" type="int"&gt; &lt;generator class="increment"/&gt; &lt;/id&gt; &lt;property name="city"/&gt; &lt;property name="state"/&gt; &lt;/class&gt; &lt;/hibernate-mapping&gt; </code></pre> <p>folks please advise. </p>
 

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