Hibernate many-to-many Associations

<span id="Label3"></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">Construction of Many-to-many Tables</span></p></p><p><p>650) this.width=650; "src=" http://s1.51cto.com/wyfs02/M01/83/CF/wKioL1d87xPggvdzAAAwpa3N7NE022.jpg "title=" 1 "alt= "wkiol1d87xpggvdzaaawpa3n7ne022.jpg"/></p></p><p><p><br></p></p><p><p><br></p></p><p><p>In the Java class</p></p><p><p>650) this.width=650; "src=" http://s1.51cto.com/wyfs02/M02/83/CF/wKioL1d871rTAFW6AAAnotK1jjg172.jpg "title=" 36020160706194558725.jpg "alt=" wkiol1d871rtafw6aaanotk1jjg172.jpg "/></p></p><p><p><strong><span style="font-family:‘宋体‘;font-size:14px;">Many-to-many</span></strong></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">1<span style="font-family:‘宋体‘;">. Relationship Operation</span></span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">1<span style="font-family:‘宋体‘;">, many to many, who operating efficiency are the same</span></span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">2<span style="font-family:‘宋体‘;">. Release the relationship</span></span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">Delete one row of data from the third table</span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">3<span style="font-family:‘宋体‘;">. Establishing a Relationship</span></span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">Add data from the third table to a single line of records</span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">4<span style="font-family:‘宋体‘;">. Change of relationship</span></span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">Delete First and then add</span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">2<span style="font-family:‘宋体‘;">. Cascade Operation</span></span></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;">are objects that operate on a collection</span></p></p><p><p><strong><span style="font-family:‘宋体‘;font-size:14px;">Example</span></strong></p></p><p><p><span style="font-family:‘宋体‘;font-size:14px;"></span></p></p><p><p><strong><span style="font-family:‘宋体‘;font-size:14px;">Tool class</span></strong></p></p><pre class="brush:java;toolbar:false"><pre class="brush:java;toolbar:false">public class Hibernateutils {public static Sessionfactory sessionfactory;    public static String url;        @Before public void init () {configuration configuration = new configuration ();        If (url==null) {configuration.configure ();        }else{configuration.configure (url); } sessionfactory = Configuration.buildsessionfactory ();}</pre></pre><p><p><span style="font-family:‘宋体‘;font-size:14px;"></span></p></p><p><p> <strong> <span style="font-family: ' The song Body '; font-size:14px;">student<span style="font-family: ' Arial ';"> map file </span> </span></strong></p></p><pre class="brush:xml;toolbar:false"><?xml version= "1.0"  encoding= "utf-8"? ><! doctype hibernate-mapping public  "-//hibernate/hibernate mapping dtd 3.0//en" " HTTP://HIBERNATE.SOURCEFORGE.NET/HIBERNATE-MAPPING-3.0.DTD ">