Java/Hibernate/Key
Key Generator UUID HEX
<source lang="java">
///////////////////////////////////////////////////////////////////////// import java.io.Serializable; import java.util.*; import java.sql.*; import org.hibernate.*; import org.hibernate.cfg.*; import org.hibernate.criterion.*; import org.hibernate.event.*; import org.hibernate.event.def.*; public class Main {
public static void main(String[] args) throws Exception {
HibernateUtil.setup("create table account (id varchar not null,name varchar,accountnumber varchar,setup Date,balance double);");
Session session = HibernateUtil.currentSession();
BasicAccount account = new BasicAccount();
account.setName("Joe");
account.setAccountnumber("39084");
account.setSetupdate(new java.util.Date());
account.setBalance(4054.00);
session.save(account);
session.flush();
BasicAccount account2 = (BasicAccount)session.load
(BasicAccount.class, account.getId());
System.out.println(account.getId() + " : " + account.getSetupdate());
System.out.println(account2.getId() +
" : " + account2.getSetupdate());
session.close();
session.close();
HibernateUtil.checkData("select * from account");
}
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd"> <hibernate-mapping>
<class name="BasicAccount" table="account">
<id name="id" type="string" unsaved-value="null">
<generator class="uuid.hex"/>
</id>
<property name="name"/>
<property name="accountnumber"/>
<property name="setupdate">
<column name="setup" sql-type="Date"/>
</property>
<property name="balance" type="double"/>
</class>
</hibernate-mapping>
///////////////////////////////////////////////////////////////////////// import java.util.*; public class BasicAccount {
private String id;
private String name;
private String accountnumber;
private Date setupdate;
private double balance;
public BasicAccount() {
}
public void setId(String s) {
id = s;
}
public String getId() {
return id;
}
public void setName(String s) {
name = s;
}
public String getName() {
return name;
}
public void setAccountnumber(String s) {
accountnumber = s;
}
public String getAccountnumber() {
return accountnumber;
}
public void setSetupdate(Date d) {
setupdate = d;
}
public Date getSetupdate() {
return setupdate;
}
public void setBalance(double d) {
balance = d;
}
public double getBalance() {
return balance;
}
}
///////////////////////////////////////////////////////////////////////// import java.sql.Connection; import java.sql.DriverManager; import java.sql.Statement; import java.sql.ResultSet; import java.sql.ResultSetMetaData; import org.hibernate.HibernateException; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; public class HibernateUtil {
public static final SessionFactory sessionFactory;
static {
try {
// Create the SessionFactory from hibernate.cfg.xml
sessionFactory = new Configuration().configure().buildSessionFactory();
} catch (Throwable ex) {
// Make sure you log the exception, as it might be swallowed
System.err.println("Initial SessionFactory creation failed." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static final ThreadLocal session = new ThreadLocal();
public static Session currentSession() throws HibernateException {
Session s = (Session) session.get();
// Open a new Session, if this thread has none yet
if (s == null) {
s = sessionFactory.openSession();
// Store it in the ThreadLocal variable
session.set(s);
}
return s;
}
public static void closeSession() throws HibernateException {
Session s = (Session) session.get();
if (s != null)
s.close();
session.set(null);
}
static Connection conn;
static Statement st;
public static void setup(String sql) {
try {
// Step 1: Load the JDBC driver.
Class.forName("org.hsqldb.jdbcDriver");
System.out.println("Driver Loaded.");
// Step 2: Establish the connection to the database.
String url = "jdbc:hsqldb:data/tutorial";
conn = DriverManager.getConnection(url, "sa", "");
System.out.println("Got Connection.");
st = conn.createStatement();
st.executeUpdate(sql);
} catch (Exception e) {
System.err.println("Got an exception! ");
e.printStackTrace();
System.exit(0);
}
}
public static void checkData(String sql) {
try {
HibernateUtil.outputResultSet(st
.executeQuery(sql));
// conn.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void outputResultSet(ResultSet rs) throws Exception{
ResultSetMetaData metadata = rs.getMetaData();
int numcols = metadata.getColumnCount();
String[] labels = new String[numcols];
int[] colwidths = new int[numcols];
int[] colpos = new int[numcols];
int linewidth;
for (int i = 0; i < numcols; i++) {
labels[i] = metadata.getColumnLabel(i + 1); // get its label
System.out.print(labels[i]+" ");
}
System.out.println("------------------------");
while (rs.next()) {
for (int i = 0; i < numcols; i++) {
Object value = rs.getObject(i + 1);
System.out.print(value.toString().trim()+" ");
}
}
}
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:data/tutorial</property>
<property name="connection.username">sa</property>
<property name="connection.password"></property>
<property name="connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<property name="show_sql">true</property>
<mapping resource="BasicAccount.hbm.xml"/>
</session-factory>
</hibernate-configuration>
/////////////////////////////////////////////////////////////////////////
</source>
Key Int Auto Increment
<source lang="java">
///////////////////////////////////////////////////////////////////////// import org.hibernate.Session; import util.ConnectionUtil; import util.HibernateUtil; public class Main {
static Session session;
public static void main(String[] args) {
open();
Keyword k = new Keyword();
session.save(k);
session.flush();
close();
}
private static void open() {
ConnectionUtil.openConnection();
ConnectionUtil.update("CREATE TABLE KEYWORDS ( ID int, NAME VARCHAR(25) )");
session = HibernateUtil.currentSession();
}
private static void close() {
ConnectionUtil.closeConnection();
HibernateUtil.closeSession();
HibernateUtil.sessionFactory.close();
}
}
///////////////////////////////////////////////////////////////////////// public class Keyword {
protected Integer id_;
protected String name_ ="aaa";
public Keyword() {
}
public Integer getId() {
return id_;
}
public void setId(Integer newId) {
this.id_ = newId;
}
public String getName() {
return name_;
}
public void setName(String newName) {
this.name_ = newName;
}
}
///////////////////////////////////////////////////////////////////////// <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
<class name="Keyword" table="keywords">
<id name="id" column="id" unsaved-value="null">
<generator class="increment"/>
</id>
<property name="name"
column="NAME"
not-null="true"
unique="true"
/>
</class>
</hibernate-mapping>
/////////////////////////////////////////////////////////////////////////
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
<property name="connection.url">jdbc:hsqldb:mem:testdb</property>
<property name="connection.username">sa</property>
<property name="connection.password"></property>
<property name="connection.pool_size">2</property>
<property name="dialect">org.hibernate.dialect.HSQLDialect</property>
<property name="show_sql">true</property>
<mapping resource="Keyword.hbm.xml"/>
</session-factory>
</hibernate-configuration>
</source>
