One to One

One to One

One-To-One relationship is in which each row in one database table is linked to 1 and 1 other row in another table.

Example: Relationship between Table A and Table B, each row in Table A is linked to another row in Table B. The number of rows in Table A must equal the number of rows in Table B.

One To One Syntax

    <entity-descriptor>

            <relationships>
			
                <relationship>
                    <property name="type">one-to-one/false</property>
                    <property name="refer">name-of-variable</property>
                    <property name="refer_to">full-class-path-of-refer-variable</property>
                    <property name="on_update">cascade/restrict/no_action/set_null/set_default</property>
                    <property name="on_delete">cascade/restrict/no_action/set_null/set_default</property>
                    <property name="load">true/false</property>
                </relationship>		
		    		
            </relationships>		

    </entity-descriptor>