One-way multi-pair One (ii) of Hibernate5.2 relation

Hibernate5.2 One-way pair-More (ii)

I. INTRODUCTION

　　In this blog post I will be in the previous blog code based on the changes, this article will introduce one-way to many.

Two. How HBM files are

Customer.hbm.xml

<?XML version= "1.0" encoding= "UTF-8"?><!DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "http://www.hibernate.org/ Dtd/hibernate-mapping-3.0.dtd "><hibernate-mapping>    <classname= "Com.demo.hibernate.one2many.Customer"Table= "Customer">        <IDname= "id"type= "int">            <Generatorclass= "sequence">                <paramname= "Sequence_name">Cus_order_seq</param>            </Generator>        </ID>        < Propertyname= "Name"type= "string"column= "Name"></ Property>        < Propertyname= "Phonenum"type= "string"column= "Phone_number"></ Property>            </class></hibernate-mapping>

Order.hbm.xml

<?XML version= "1.0" encoding= "UTF-8"?><!DOCTYPE hibernate-mapping Public "-//hibernate/hibernate mapping DTD 3.0//en" "http://www.hibernate.org/ Dtd/hibernate-mapping-3.0.dtd "><hibernate-mapping>    <classname= "Com.demo.hibernate.one2many.Order"Table= "Orders">        <IDname= "id"type= "int">            <Generatorclass= "sequence">                <paramname= "Sequence_name">Cus_order_seq</param>            </Generator>        </ID>        < Propertyname= "OrderId"column= "order_id"type= "string"></ Property>        < Propertyname= "Createtime"column= "Create_time"type= "Timestamp"></ Property>        <Many-to-onename= "Customer"class= "Com.demo.hibernate.one2many.Customer"column= "customer_id"></Many-to-one>    </class></hibernate-mapping>

Three. How to Annotate

Customer.java

@Entity @table (name= "Customer") Public classCustomer {@Id @Column (name= "id") @SequenceGenerator (name= "Sequencegenerator", sequencename= "Cus_order_seq", allocationsize=1)@GeneratedValue (Generator= "Sequencegenerator")    Private intID; @Column (Name= "Name")    PrivateString name; @Column (Name= "Phone_number")    PrivateString Phonenum; //Setter and Getter}

Order.java

@Entity @table (name= "Orders") Public classOrder {@Id @Column (name= "id") @SequenceGenerator (name= "Sequencegenerator", sequencename= "Cus_order_seq", allocationsize=1)@GeneratedValue (Generator= "Sequencegenerator")    Private intID; @Column (Name= "order_id")    PrivateString orderId; @Column (Name= "Create_time") @Type (Type= "Timestamp")    PrivateDate Createtime; @ManyToOne (Fetch=fetchtype.lazy)//annotations need to specify a deferred load policy @JoinColumn (name= "customer_id")    Privatecustomer customer; //Setter and Getter}

Four. Test code

A. Save

@Test Public voidSave () {Transaction tx=session.begintransaction (); Customer Customer=NewCustomer (); Customer.setname ("AAAAA"); Customer.setphonenum ("334411"); Order Order=NewOrder (); Order.setcreatetime (NewDate ()); Order.setorderid (A);            Order.setcustomer (customer); Order Order1=NewOrder (); Order1.setcreatetime (NewDate ()); Order1.setorderid (B);            Order1.setcustomer (customer);    Session.save (customer);    Session.save (order);    Session.save (Order1); Tx.commit ();
}

B.get Way

@Test  Public void get () {    = Session.get (Order.  Class, +);    SYSTEM.OUT.PRINTLN ("Query customer's SQL has been sent")    ; + "::" + order.getcreatetime ());     = Order.getcustomer ();    SYSTEM.OUT.PRINTLN ("Query for customer's SQL has not been sent, because lazy loading, only when the use of the customer when the SQL will be sent");     + "::" + Customer.getphonenum ());}

C.load Way

@Test  Public void load () {    = Session.load (Order.  Class, +);    SYSTEM.OUT.PRINTLN ("Query order SQL has not been sent, only when the use of the time will be relaxed SQL");     + "::" + order.getcreatetime ());     = Order.getcustomer ();    System.out.println ("The customer of the query order has not been sent, because the delay is loaded, only the SQL will be sent when the customer is used");     + "::" + Customer.getphonenum ());}

D.delete (delete)

@Test  Public void Delete () {    new  Order ();    Order.setid (+);     = session.begintransaction ();    Session.delete (order);    Tx.commit ();}

E.update (update)

@Test  Public void Update () {    new  Order ();    Order.setid ();      Order.setcreatetime (new  Date ());    Order.setorderid ("N");             = session.begintransaction ();    Session.update (order);    Tx.commit ();}

One-way multi-pair One (ii) of Hibernate5.2 relation