Example of using usertype on hibernate3.2

Take a closer look at the hibernate Doc and find a lot of surprising things. I regret how useless it is.
The main purpose of this project is.
Database Table: echomessageemail, which has three field IDS (automatic numbers) \ Name \ email (varchar)
Purpose: The e-mail value in the database field is similar to the heweiya@gmail.com; heweiya@21cn.com; www.1718zx.cn. Therefore, it is required to be expressed in list.

That is, the generated datamodel contains a list object.
. HBM. xml

XML Code

<? 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>
<! --
Mapping File autogenerated by myeclipse-hibernate tools
-->
<Hibernate-mapping>
<Class name = "com. travelsky. hibernate. Po. echomessageemail" table = "echo_message_email">

<ID name = "ID" type = "Java. Lang. Integer">
<Column name = "ID"/>
<Generator class = "native"> </generator>
</ID>
<Property name = "name" type = "Java. Lang. String">
<Column name = "name" length = "50" not-null = "true"/>
</Property>
<Property name = "email" type = "com. travelsky. hibernate. Po. emaillist" lazy = "true">
<Column name = "email"/>
</Property>
</Class>
</Hibernate-mapping>
Corresponding pojo:

Java code

Package com. travelsky. hibernate. Po;
Import java. util. List;

/**
* Echomessageemail generated by myeclipse persistence tools
*/

Public class echomessageemail implements java. Io. serializable {

Private integer ID;
Private string name;
Private list email;

/** Default constructor */
Public echomessageemail (){
}

/** Minimal constructor */
Public echomessageemail (string name ){
This. Name = Name;
}

/** Full constructor */
Public echomessageemail (string name, list email ){
This. Name = Name;
This. Email = Email;
}

// Property accessors

Public integer GETID (){
Return this. ID;
}

Public void setid (integer ID ){
This. ID = ID;
}

Public String getname (){
Return this. Name;
}

Public void setname (string name ){
This. Name = Name;
}

Public list getemail (){
Return email;
}

Public void setemail (list email ){
This. Email = Email;
}

}
One usertype class: emaillist

Java code

Package com. travelsky. hibernate. Po;

Import java. Io. serializable;
Import java. SQL. preparedstatement;
Import java. SQL. resultset;
Import java. SQL. sqlexception;
Import java. SQL. types;
Import java. util. arraylist;
Import java. util. List;

Import org. Apache. commons. Lang. stringutils;
Import org. hibernate. hibernateexception;
Import org. hibernate. hibernate;

/**
* Java. Io. serializable must be referenced, and usertype is deserialization.
* In addition, The Hibernate version I use is 3.2, and the usertype is significantly different from 2.0 to 3.2. Please take a look at the official Doc
*
* @ Author @ Jia Jun. Pay attention to org. hibernate. usertype. usertype. Do not build your own car.
*
*/
Public class emaillist implements java. Io. serializable, org. hibernate. usertype. usertype {

Private list emails;

Private Static final string splitter = ";";

Private Static final int [] types = new int [] {types. varchar };

Public int [] sqltypes (){

Return types;
}

Public class returnedclass (){
// Todo auto-generated method stub
Return list. Class;
}

Public Boolean equals (Object X, object y) throws hibernateexception {
If (x = y)
Return true;
If (X! = NULL & Y! = NULL ){
List xlist = (list) X;
List ylist = (list) y;
If (xlist. Size ()! = Ylist. Size ())
Return false;
For (INT I = 0; I <xlist. Size (); I ++ ){
String str1 = (string) xlist. Get (I );
String str2 = (string) ylist. Get (I );
If (! Str1.equals (str2 ))
Return false;
}
Return true;
}
Return false;
}

Public object nullsafeget (resultset RS, string [] names, object owner)
Throws hibernateexception, sqlexception {
String value = (string) hibernate. String. nullsafeget (RS, Names [0]);
If (value! = NULL ){
Return parse (value );
} Else {
Return NULL;
}
}

Public void nullsafeset (preparedstatement St, object value, int index)
Throws hibernateexception, sqlexception {
System. Out. println ("Set Method excecuted ");
If (value! = NULL ){
String STR = assemble (list) value );
Hibernate. String. nullsafeset (St, STR, index );
} Else {
Hibernate. String. nullsafeset (St, value, index );
}

}

Public object deepcopy (object Value) throws hibernateexception {
List sourcelist = (list) value;
List targetlist = new arraylist ();
Targetlist. addall (sourcelist );
Return targetlist;
}

Public Boolean ismutable (){
Return false;
}

Private string assemble (list emaillist ){
Stringbuffer strbuf = new stringbuffer ();
For (INT I = 0; I <emaillist. Size ()-1; I ++ ){
Strbuf. append (emaillist. Get (I). append (splitter );
}
Strbuf. append (emaillist. Get (emaillist. Size ()-1 ));
Return strbuf. tostring ();
}

Private list parse (string value ){
String [] STRs = stringutils. Split (value, splitter );
List emaillist = new arraylist ();
For (INT I = 0; I <STRs. length; I ++ ){
Emaillist. Add (STRs [I]);
}
Return emaillist;
}

Public object assemble (serializable arg0, object arg1) throws hibernateexception {

// Todo auto-generated method stub
Return NULL;
}

Public serializable disassemble (Object arg0) throws hibernateexception {
// Todo auto-generated method stub
Return NULL;
}

Public int hashcode (Object arg0) throws hibernateexception {
// Todo auto-generated method stub
Return 0;
}

Public object Replace (Object arg0, object arg1, object arg2) throws hibernateexception {

// Todo auto-generated method stub
Return NULL;
}

}
Test class:

Java code

Package com. travelsky. test;
Import java. util. List;
Import java. util. listiterator;
Import com. travelsky. hibernate. Po. echomessageemail;
Import org. hibernate. query;
Import org. hibernate. Session;
Import org. hibernate. sessionfactory;
Import org. hibernate. cfg. configuration;

Public class hibernatetest {

Public static void main (string [] ARGs) throws exception {
Configuration Config = new configuration (). Configure ();
Sessionfactory factory = config. buildsessionfactory ();
Session session = factory. opensession ();
Query query = session. createquery ("from echomessageemail as ");
/**
* Theoretically, lazy loading does not exist. iterator is used for security reasons.
*
*/
Listiterator iterator = query. List (). listiterator ();
Echomessageemail TT = (echomessageemail) iterator. Next (); // only find the first
List emails = TT. getemail ();
For (INT I = 0; I <emails. Size (); I ++ ){
String emailstr = (string) emails. Get (I );
System. Out. println (emailstr );
}
Session. Close ();
}
}