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public void ejbActivate()
throws EJBException,
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[647]Test the serialization/deserialization of a primary key
By Anonymous on 2004/04/16 03:58:30 Rate
public static void testSerialization ( myEntityBeanHomeRemote home )
throws Exception
{
System.out.println ( "Testing serialization of primary key" ) ;
Integer pk_1 = new Integer ( 101 ) ;
myEntityBeanRemote myEntityBean_1 = home.findByPrimaryKey ( pk_1 ) ;
System.out.println ( "Setting myEntityBean name to Presidential Suite" ) ;
myEntityBean_1.setName ( "Presidential Suite" ) ;
// Serialize the primary key for myEntityBean 101 to a file.
FileOutputStream fos = new FileOutputStream ( "pk101.ser" ) ;
ObjectOutputStream outStream = new ObjectOutputStream ( fos ) ;
System.out.println ( "Writing primary key object to file..." ) ;
outStream.writeObject ( pk_1 ) ;
outStream.flush ( ) ;
outStream.close ( ) ;
pk_1 = null;
// Deserialize the primary key for myEntityBean 101.
FileInputStream fis = new FileInputStream ( "pk101.ser" ) ;
ObjectInputStream inStream = new ObjectInputStream ( fis ) ;
System.out.println ( "Reading primary key object from file..." ) ;
Integer pk_2 = ( Integer ) inStream.readObject ( ) ;
inStream.close ( ) ;
// Re-obtain a remote reference to myEntityBean 101 and read its name.
System.out.println ( "Acquiring reference using deserialized primary key..." ) ;
myEntityBeanRemote myEntityBean_2 = home.findByPrimaryKey ( pk_2 ) ;
System.out.println ( "Retrieving name of myEntityBean using new remote reference..." ) ;
System.out.println ( myEntityBean_2.getName ( ) ) ;
}
//ejbActivate
public void ejbLoad()
throws EJBException,
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public void ejbPassivate()
throws EJBException,
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public void ejbRemove()
throws RemoveException,
EJBException,
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public void ejbStore()
throws EJBException,
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[891]Map Blob field in CMP entity bean to BLOB data type in database
By Anonymous on 2004/09/10 13:54:10 Rate
//You cannot directly map a java.sql.Blob field type in CMP entity
//bean to BLOB data type in database and use byte [ ] to manipulate
//BLOB data type.You have to remember that this is not an efficient
//approach if you are storing data that is very large ( more than
//25M ) and probably consider alternatives.
// Locate and open the file
File imgFile = new File ( fileName ) ;
long imgFileSize= imgFile.length ( ) ;
// initialize the byte array
byte byteValue [ ] = new byte [ ( int ) imgFileSize ] ;
// Read the file into the byte array
InputStream is = new BufferedInputStream ( new FileInputStream ( imgFile ) ) ;
int len = is.read ( byteValue ) ;
//Add the byte to the entity bean field
if ( len!=imgFileSize ) {
System.out.println ( "Read bytes did not equal file size on directory" ) ;
}
else {
MyPicCMPLocal myPic = empHome.create ( empNo , byteValue ) ;
}
//The following is a code snippet from MyPicCMP.java
public abstract class MyPicCMP implements EntityBean
{
....
public abstract byte [ ] getPicture ( ) ;
public abstract void setPicture ( byte [ ] newPicture ) ;
public Long ejbCreate ( Long empno, byte [ ] newPicture )
{
setEmpno ( empno ) ;
setPicture ( newPicture ) ;
return empno;
}
public void ejbPostCreate ( Long empno, byte [ ] newPicture )
{
}
...
}
public void setEntityContext(EntityContext ctx)
throws EJBException,
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public void unsetEntityContext()
throws EJBException,
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Java API By Example, From Geeks To Geeks.