Hibernate ORM Framework--First chapter: Hibernate Introduction and operational basics

I. Download and import of related usage tools (environment configuration)

hibernate-release-4.2.21.final--> old version
Hibernate-release-5.2.10.final--> new version

First need decompression: hibernate-release-5.2.10.final (new version)
--Copy all the jar packages from the Lib folder in the extracted Hibernate-release-5.2.10.final folder to the Lib folder under the root project, including the JDBC Ojdbc6.jar package
-Turn all jar packs into milk bottles

Unzip: Hibernate-tutorials file: Can be found in this file: basic--always go in.
Until you see the Java and Resources files, then select the XML header file that you want to have in the file according to the requirements

-->hibernate.cfg.xml (header file for configuration files)
<! DOCTYPE hibernate-configuration Public
"-//hibernate/hibernate Configuration DTD 3.0//en"
"Http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd" >
-->empmapping.xml (header file of the mapping file)
<! DOCTYPE hibernate-mapping Public
"-//hibernate/hibernate Mapping DTD 3.0//en"
"Http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd" >

Second, the first hibernate add an operation

1) using the PL/SQL database

2) First analogy native JDBC implementation add operation: (no need to encapsulate Util package)

Note: This code must first create the required tables in the database

2.1) analogy Jave native JDBC Implementation add operation

1.1 Util Package-->dbutils.java: Connect database driver

 PackageUtils;Importjava.sql.Connection;ImportJava.sql.DriverManager;Importjava.sql.SQLException; Public classDbutils {Private Static FinalString url = "Jdbc:oracle:thin: @localhost: 1521:orcl"; Private Static FinalString username = "MyUser"; Private Static FinalString Password = "123";  Public StaticConnection getconnection ()throwsSQLException {returndrivermanager.getconnection (URL, username, password); }         Public Static voidCloseConnection (Connection conn)throwsSQLException {conn.close (); }    }

1.2 Write entity objects

 Package entity;  Public class testentity {    private  String name;      Public String GetName () {        return  name;    }      Public void setName (String name) {        this. Name = name;    }} 

1.3 Writing DAO Packages

 PackageDAO;Importjava.sql.Connection;Importjava.sql.PreparedStatement;ImportJava.sql.ResultSet;Importjava.sql.SQLException;Importjava.util.ArrayList;Importjava.util.List;Importentity. testentity;ImportUtils. Dbutils; Public classTestdao { Public voidInsert (String name)throwssqlexception{Connection Conn=dbutils.getconnection (); String SQL= "INSERT INTO mytable values (?)"; PreparedStatement PS=conn.preparestatement (SQL); Ps.setstring (1, name);    Ps.executeupdate (); }             PublicList<testentity> GetAll ()throwsException {List<TestEntity> result =NewArraylist<testentity>(); Connection Conn=dbutils.getconnection (); String SQL= "SELECT * FROM MyTable"; PreparedStatement PS=conn.preparestatement (SQL); ResultSet RS=Ps.executequery ();  while(Rs.next ()) {testentity entity=Newtestentity (); Entity.setname (Rs.getstring (1));        Result.add (entity); }        returnresult; }}

1.4 Write Test Package

 PackageYuanmain;Importjava.util.List;ImportDAO. Testdao;Importentity. testentity; Public classYuanmain { Public Static voidMain (string[] args)throwsException {/* Follow the previous JDBC Add and query database operation*/        /*Add*/Testdao Testdao=NewTestdao (); //Testdao.insert ("xxttt");                        /*Enquiry*/List<TestEntity> all =Testdao.getall ();        System.out.println (All.size ());  for(testentity testentity:all) {System.out.println (Testentity.getname ()); }        }}

3) The first Hibernate implementation adds the operation code (optimizes the above analogy Java code)

3.1---first copy all the jar packages from the Lib folder in the extracted Hibernate-release-5.2.10.final folder to the Lib folder under the root project, including the JDBC Ojdbc6.jar package
-Turn all jar packs into milk bottles

Project structure:

3.2 Write code:

Configuration file

<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-Configuration Public"-//hibernate/hibernate Configuration DTD 3.0//en" "Http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd" & gt;true</property> <!--display formatted SQL statements: Optimized typesetting--<property name= "Format_sql" >true</property> <!--datasheet map configuration file--<mapping resource= "Com/nf/personer.xml" ></mappin G> </session-factory> 
Entity objects:
 Packagecom.nf; Public classPersoner {Private Longpid; PrivateString pname;  Public LongGetpid () {returnpid; }     Public voidSetpid (Longpid) {         This. PID =pid; }     PublicString Getpname () {returnpname; }     Public voidsetpname (String pname) { This. pname =pname; }        }
Entity mapping File
<?xml version= "1.0" encoding= "UTF-8"? ><! DOCTYPE hibernate-configuration        Public "-//hibernate/hibernate configuration DTD 3.0//en"         package = "COM.NF" >    <class name= "Personer" table= "personers" >        <id name= "pid" column= "id" >            <!--Identity primary key: Increment/native autogrow, assigned self-input-            class= "Increment" >< /generator>        </id>        <property name= "pname" ></property>    </class >
Test class
 Packagecom.nf;Importorg.hibernate.Session;Importorg.hibernate.SessionFactory;Importorg.hibernate.Transaction;Importorg.hibernate.boot.MetadataSources;ImportOrg.hibernate.boot.registry.StandardServiceRegistry;ImportOrg.hibernate.boot.registry.StandardServiceRegistryBuilder; Public classMain { Public Static voidMain (string[] args) {Standardserviceregistry Registry=Newstandardserviceregistrybuilder (). Configure (). build (); Sessionfactory SF=Newmetadatasources (registry). Buildmetadata (). Buildsessionfactory (); Session s=sf.opensession (); Personer PS=NewPersoner (); Ps.setpname ("XXX"); /*ps.setpname ("try");*/Transaction TS=s.begintransaction ();        S.save (PS);                Ts.commit ();        S.close ();    Sf.close (); }}
* * Above personal packing notes, if wrong or do not understand the place, welcome comments and points * *
Hibernate ORM Framework--First chapter: Hibernate Introduction and operational basics