BLOB field in Entity CMP EJB (DB = Oracle)

I use Borland App Server 4.5.1 .
I have table, which has BLOB column.
My first question is:
What datatype should corresponding field in Entity CMP EJB have?
I set it to byte [].
When I deal with BLOB data of small size, everything is OK.
But when the size of BLOB data is few larger,
when I insert new record
an Oracle error happens: a sort of
"TNS adapter error: end of communication chanel"
I use thin jdbc-driver.
So does anybody have an experience in working with BLOB field in Entity CMP EJB (DB = Oracle) ?
may be, the solution is to write BMP fields in Entity EJB,
i.e. to write own methods
set[BLOB_COLUMN](...),
get[BLOB_COLUMN]() ?
Thank you for answers.

I have tried with db2 7.1/ IAS 4.0 and it works fine
I use Borland App Server 4.5.1 .
I have table, which has BLOB column.
My first question is:
What datatype should corresponding field in Entity CMP
EJB have?
I set it to byte [].this is perfect
When I deal with BLOB data of small size, everything
is OK.
But when the size of BLOB data is few larger,
when I insert new record
an Oracle error happens: a sort of
"TNS adapter error: end of communication chanel"In db2 there is a max size limit on the blob column. please check if such limit for oracle database.
>
I use thin jdbc-driver.
So does anybody have an experience in working with
BLOB field in Entity CMP EJB (DB = Oracle) ?
may be, the solution is to write BMP fields in Entity
EJB,
i.e. to write own methods
set[BLOB_COLUMN](...),
get[BLOB_COLUMN]() ?this is a good approach
>
Thank you for answers.Regards,
-- Ashish

Similar Messages

Adding more fields to a CMP EJB

I'm using Sun's ONE studio 5, Sun ONE AS, and PointBase-db.
I use the CMP EJB wizard to generate the skeleton for a CMP EJB, and specify to use a database-table from PointBase as the CMP-persistant fields.
The problem arises when i want to add futher fields, when i try adding the in the IDE, i cant deploy the application(!)
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Thank you in advance!

Please see response to
http://forum.java.sun.com/thread.jsp?forum=136&thread=444274&start=0&range=15#2191688
vbk

Paradox - Should entity CMP EJB be faster than stateless session bean?

Please bear with me on this.
Just thinking of this scenario: hello world application. It can be implemented both as stateless session bean and entity bean.
There's no persistent. So for the entity bean, it will be container managed, and no code to do anything to the load/remove/create. - comparably the same as stateless bean.
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Feels like a comparison between apples and oranges.
A stateless session bean is like every other instance, so these can be pooled by the EJB container. The container is free to create an instance for each client if necessary. That's different.
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BLOB & CMP EJB - Cannot bind stream to a ScrollableResultSet

Hi,
I am trying to bind a byte[] to a Blob column in CMP EJB using Oracle 10g OCI driver in WebSphere. This gives the below error.
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Thanks

When you create a DataSource, use the below class in the field 'Data Source helper classs name'. This should solve the issue.
import java.util.Properties;
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CMP EJBs for Weblogic 6.1

Hi All
It seems that when I use the functionality to build a CMP EJB (an EJB that is automatically built based on an Oracle table) the deployment descriptors are missing lots of info so it it not possible to deploy to Weblogic (6.1).
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Session Beans seem OK.
Anyone got any thoughts on this?
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For Weblogic - Users can develop session beans add weblogic-ejb-jar.xml and
deploy to a WebLogic connection.
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JDeveloper provides Deployment descriptor editors for editing weblogic-ejb-jar.xml thru UI panels. This is very convinient rather than hand editing the XML.
Currently you would have to add Weblogic cmp specific deployment descriptor into the project and make it part of the EJB.jar during the assembly process (i.e when you create the deployment profile).
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CMP EJB CLOB/BLOB retrieval issues from Oracle through JBoss

I have some EJB 2.0 CMP Entity Beans, deployed on a JBoss 3.07 application server.
In some of my beans I have Strings that I would like to map to a CLOB in my database as the Strings could easily be more than 4000 characters, and some byte arrays that I would like to map to a BLOB in my database to store files.
When I use PostgreSQL as my datastore in JBoss I can store and retrieve data from my CLOBs and BLOBs just fine.
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When I test using LONG RAW as a type it works perfectly, but LONG RAW is not a standard SQL type. I do not want to convert my beans to BMP, and also do not want to have any Oracle specific code in my beans to store retrieve my information. I need my beans to be completely database independant.
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I solved my problem.
I am using XDoclet to generate my bean interfaces and xml files etc., and it generates the jbosscmp-jdbc.xml file for me.
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Running CMP EJB in remote OC4J fails, works in embedded. Oracle 9i

I more or less followed the EJB Tutorial (in the help) for creating a session-entity bean facade from Oracle 9i tables. Everything executes correctly in the embedded oc4j but it fails on the remote oc4j with
java.sql.SQLException: Invalid column name
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     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:229)
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:292)
     at oracle.jdbc.driver.OracleStatement.get_column_index(OracleStatement.java:5632)
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     at oracle.jdbc.driver.OracleResultSet.getString(OracleResultSet.java:1506)
     at com.evermind.sql.FilterResultSet.getString(FilterResultSet.java:585)
     at EmployeeLocalHome_EntityHomeWrapper13.findAll(EmployeeLocalHome_EntityHomeWrapper13.java:1260)
Then I also created another simpler CMP EJB that just has 3 fields from Oracle table. This one doesn't even work in embedded oc4j :
com.evermind.server.rmi.OrionRemoteException: Database error: ORA-01747: invalid user.table.column, table.column, or column specification
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Are there any known problems I should look out for with generating CMP EJBS with wizards?
I think the IDE is more intuitive than WSAD. It would be great it things worked though.
Another question is regarding relationships. Do the wizards always use ejb-refs to implement relationships? It should be easy enough to add them with EJB Editor if they do not.
Thanks for any help.

Known issues are documented in the release notes
http://otn.oracle.com/products/jdev/htdocs/readme_903Preview.html#ejb
<<<Another question is regarding relationships. Do the wizards always use ejb-refs to implement relationships? >>>>
Not sure what you meant here. If you reverse engineer let us say DEPT and EMP tables, foreign key relationships between the tables are reverse engineered as CMR but there aren't any ejb-ref/ejb-local-ref tags which get generated in the deployment descriptor.
<<It should be easy enough to add them with EJB Editor if they do not. >>
You can double-click on the EJB to bring the EJB Module Editor and select "Relationships" node to add/edit/delete relationships visually.
raghu
JDev Team

How to upload size 4k file to oracle BLOB field

hi all, i'm using Oracle 9i, Orcale JDBC thin Driver and ibm websphere to develop a java application.i have used java EJB/CMP to insert images into BLOB field in oracle.
i used byte[] mapping to BLOB.i did it successfully.
however, i'm facing another problem. it is that
when i insert files larger than 4k, there is exception error. it said that the inserted value is too large.
is that the problem of orcale JDBC?
is that any solution to solve this restriction?
it is very urgent, pls help!
thx a lot

Hi Lee
Thanks for ur valuable suggestions. Please give me
more idea i would really thank to u !Which part is giving you troubles?
Oh - and change my suggestion to use setBinaryStream to a suggestion to use setAsciiStream, as I missed the part where you said "text file".
>
Can anybody tell me anyother way how to solv thid
problem
Depending on the size of the text file you could just read the file so you have the contents as a String and use setString (also in the PreparedStatement interface).
hanks
Message was edited by:
MerlinRosina

Blob field using cmp

Hi ,
I need to retrieve the blob data stored in oracle 9i database.
I am using studio 5 to create a CMP using which the blob field gets mapped to java.io.Serializable class. Oracle thin driver is used and an image of size 1 kb is stored in the table.
When the client (servlet) calls the method to get the contents of the blob field, the following exceptions are thrown :
com.sun.jdo.api.persistence.support.JDOFatalDataStoreException: IOException reading serializable object from byte array.
NestedException: java.io.StreamCorruptedException: invalid stream header
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     at orclblobfolder.orclejb.orclblobBean.getBlobImage(orclblobBean.java:84)
     at orclblobfolder.orclejb.orclblobBean_1927863344_ConcreteImpl_EJBObjectImpl.getBlobImage(orclblobBean_1927863344_ConcreteImpl_EJBObjectImpl.java:22)
     at orclblobfolder.orclejb._orclblobBean_1927863344_ConcreteImpl_EJBObjectImpl_Tie._invoke(Unknown Source)
     at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatchToServant(GenericPOAServerSC.java:569)
     at com.sun.corba.ee.internal.POA.GenericPOAServerSC.internalDispatch(GenericPOAServerSC.java:211)
     at com.sun.corba.ee.internal.POA.GenericPOAServerSC.dispatch(GenericPOAServerSC.java:113)
     at com.sun.corba.ee.internal.iiop.ORB.process(ORB.java:275)
     at com.sun.corba.ee.internal.iiop.LocalClientRequestImpl.invoke(LocalClientRequestImpl.java:96)
     at com.sun.corba.ee.internal.corba.ClientDelegate.invoke(ClientDelegate.java:237)
     at com.sun.corba.ee.internal.POA.GenericPOAClientSC.invoke(GenericPOAClientSC.java:97)
     at org.omg.CORBA.portable.ObjectImpl._invoke(ObjectImpl.java:457)
     at orclblobfolder.orclejb._orclblob_Stub.getBlobImage(Unknown Source)
     at orclblobfolder.orclejb._orclblob_Stub.getBlobImage(Unknown Source)
     at test.processRequest(test.java:67)
     at test.doGet(test.java:127)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
     at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
     at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
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snippet of bean class is :
public abstract java.io.Serializable getImage();
public abstract void setImage(java.io.Serializable image);
public java.io.Serializable getBlobImage() {
//method which client calls
return getImage();
Similar exceptions are thrown when I use poinbase wherein blob data is mapped to byte[] instead of java.io.Serializable.
Please let me know how can I resolve this problem.
Thanks a lot,
-Amol

How does it effect, when the blob data is stored indatabase using an external source
The current CMP implementation assumes that a serializable field is stored by serializing it to a byte[] and then storing the byte[] as blob. while retrieving the data, it always tries to de-serialize the byte[] in to a serializable field. Hence if you have stored the data externally, it would fail with "JDOFatalDataStoreException: IOException reading serializable object from byte array."
Thanks,
Mitesh

Additional field in join table for CMP EJB

Hello,
I'm trying to perform this task using CMP entity beans:
The entity A has a CMR relation of cardinality m-n with entity B (bidirectional) (This is working fine).
I want to add a parameter to the relation.
Ex : When I find that A1 is linked to B1, I need to perform "x" times an action. x would be my parameter, and I would have kept this parameter as an additional column in the join table A_TO_B.
Could anyone provide an example of how to perform this with CMP EJB?
NOTE: I'm using OC4J 10g 9.0.4 standalone (and cannot change my version).
Thanks
Tanguy

Manohar,
You need to create an append structure for table VBAP (for example ZAVBAP) using SE11. In this structure you create your ZZ fields. If you need a non-SAP domain/data element for your field then you need to create it first using the same transaction and activate it. Attach ZAVBAP to VBAP so the SE11 shows:
.APPEND in the Fields column and
ZAVBAP in the Field type column.
Your ZZ fields will be shown automatically.
When you have finished then activate your ZAVBAP structure. You will notice when you go VA01 (for example) that a lot of programs are being recompiled. Don't worry. It will be ok.
The user-exit screen number for items is 8459 (in program SAPMV45A).
Thanks,
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Weblogic and cmp with blob fields

I have an entity bean with cmp. This bean has a blob field. When ejbCreate and
ejbPostCreate methods are executed in this bean, exception saying "row containing
the LOB value is not locked" is thrown.
The transaction attribute for the method is set to RequiresNew in the deployment
descriptor.
Can someone suggest what may be going wrong here.
Thanks

I have an entity bean with cmp. This bean has a blob field. When ejbCreate and
ejbPostCreate methods are executed in this bean, exception saying "row containing
the LOB value is not locked" is thrown.
The transaction attribute for the method is set to RequiresNew in the deployment
descriptor.
Can someone suggest what may be going wrong here.
Thanks

Using a CMP Entity Bean local stub as a field of another CMP Entity Bean

Hello,
Is it possible to implement a field of a CMP Entity bean as another CMP Entity bean and how is it done?
I've seen a pseudo code for this in Ed Roman's Mastering EJBs, second edition, but I can't seem to get it to work (pages: 330 - 1:1 using CMP and 339 - fake M:N using CMP).
I'm using SUN ONE Application Sever 7. Is this server capable of this?
I'm trying to implement a fake M:N relationship using 3 beans: 2 for each side of the relationship and one as the "bridge" table.
For example, the two beans on each side of the relationship are SubscriberBean, SubscriptionBean and the "bridge: bean is SubscriberSubscriptionBean. The SubscriberSubscriptionBean has two fields: SubscriberLocal stub and SubscriptionLocal stub.
Please let me know if you need more information to answer this question.
Thanks.
Nikola

Im sorry but i dont know about the example you are talking about. I kinda learn
all those techniques from forums, articles and tutorials because book often suffer from
not having the information im mostly looking for.
As far as i understand you, you want to implement a bridge been, which is representing a row in a join table. So that if one side of the relation is deleted the join-table entry (your bridge-CMP-Bean) is cascaded. Right?
First of all the simple part: (My approach)
- The joint table is foreign keys only - without a relation description. -
In this case you dont have to implement a bridge bean. Because it just wouldnt represent anything of sense.
Lets think of an entity/table USER whith the columns name (PRIMARY KEY), and prename.
Our second entity/table is ADDRESS with the columns road (PRIMARY KEY) and housenr.
The join table is simply: USER_ADDRESS with fk_name (FOREIGN KEY) and fk_road (FOREIGN KEY) both on CASCADE DELETE. So if the address is deleted the mapping entry is deleted, too same for the user part:
USER -> USER_ADDRESS <- ADDRESS.
Our entity Beans are called User and Address in class-names JNDI-names and names.
Now we want to create the CMR mapping so we can access the addresses of a user from the user bean directly. The methods on the user side are:
public abstract Collection getAddresses();
and
public abstract void setAddresses(Collection new_addresses);
the xdoclet comments on the User side are (for the getter only)
* @ejb.interface-method
* @ejb.relation
*                name = "User-has-Addresses"
*                role-name = "User-Addresses"
*                target-ejb = "Address"
*                target-multiple = "true"
* @sunone.relation
*                column="USER_ADDRESS.fk_name"
*                target="USER_ADDRESS.fk_road"
public abstract Collection getAddresses();
for the other side of the relation we define in the Address-Entity
public abstract Collection getUsers();
and
public void setUsers(Collection users);
the xdoclet comments on the Address side are (for the getter only)
* @ejb.interface-method
* @ejb.relation
*                name = "User-has-Addresses"
*                role-name = "Address-User"
*                target-ejb = "User"
*                target-multiple = "true"
* @sunone.relation
*                target="USER_ADDRESS.fk_road"
*                column="USER_ADDRESS.fk_name"
As we dont want the user or address to be deleted if the other side of the relation is deleted we dont specify cascade-delete="yes" in the ejb.relation namespace.
The sun-cmp-mappings.xml should now look like this:
(For the User - side)

<cmr-field-mapping>
<cmr-field-name>addresses</cmr-field-name>
<column-pair>
<column-name>USER_ADDRESS.fk_name</column-name>
<column-name>USER_ADDRESS.fk_road</column-name>
</column-pair>
</cmr-field-mapping>
and similar on the Address-Side:
<cmr-field-mapping>
<cmr-field-name>users</cmr-field-name>
<column-pair>
<column-name>USER_ADDRESS.fk_road</column-name>
<column-name>USER_ADDRESS.fk_name>/column-name>
</column-pair>
</cmr-field-mapping>
Dont forget that all elements in the Collection must be of the right Interface-type.
First of all the harder part:
Now what you might want is when the relation has some information specified like user live at address and is tenant or facility manager.
The, in the first step you will have to implement the UserAddressRelation entity which will have to CMR fields of the 1:N type.(Just as you wish)
Lets think of the example above extended by the relation type. Our relation bean is named UserAddressRelation.
Now User has the methods as above but the classes in the Collection must now be of the UserAddressRelationLocal/Remote interface and not AddressLocal/Remote-interface.
You will have to change the xdoclet comment to:
* @ejb.interface-method
* @ejb.relation
*                name = "User-has-Addresses"
*                role-name = "User-Address"
*                target-ejb = "UserAddressRelation"
*                target-multiple = "true"
* @sunone.relation
*                target="USER_ADDRESS.fk_name"
*                column="USER.name"
So we now dont reference the other side bean directly. We reference the relation EntityBean. Do the similar changes on the other side.
In particular you will have to specify 4 CMR mappings now:
1. User to UserAddressRelation 1:N
2. UserAddressRelation N:1
3. Address to UserAddressRelation 1:N
4. UserAddressRelation N:1
Which i dont want to explain in detail now because its kinda all the same as above.
Now you cann access the Addresses of a user in the way.
UserLocal.getAddresses(); <- !you get the mappings!
UserLocal.getAddresses().item(0).getAddress() <- you get the address (this is dirty coding just for understanding)
UserLocal.getAddresses().item(0).getUserRole() <. you get the role of the user at this address.
Hope this helped you. You are welcome to ask any detailed question.

Error while trying to store PDF in Oracle's BLOB field

Hi folks!
I'm having problems while trying to store PDF file in a BLOB field of an Oracle table
This is the message code:
Exception in thread "main" java.sql.SQLException: Data size bigger than max size for this type: 169894
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:179)
at oracle.jdbc.ttc7.TTCItem.setArrayData(TTCItem.java:95)
at oracle.jdbc.dbaccess.DBDataSetImpl.setBytesBindItem(DBDataSetImpl.java:2414)
at oracle.jdbc.driver.OraclePreparedStatement.setItem(OraclePreparedStatement.java:1134)
at oracle.jdbc.driver.OraclePreparedStatement.setBytes(OraclePreparedStatement.java:2170)
at vgoactualizacion.Main.main(Main.java:84)
This is the piece of code i'm using:
Assuming conn = conection to Oracle 10g Database ( it's working )
String miProcedimientoAlmacenado = "{ call package_name.update_client(?,?, ?) }";
CallableStatement miComando = conn.prepareCall(miProcedimientoAlmacenado);
miComando.setString(1,miClienteID ); //first parameter : IN
               //second parameter : IN
File miPDF = new File(pathPDF + "//" + miClienteID + ".pdf");
byte[] bodyIn = readFully(miPDF); //readFully procedure is shown below
miComando.setBytes(2, bodyIn); //THIS IS THE LINE WHERE THE ERROR IS PRODUCED
          //3rd parameter: OUT
miComando.registerOutParameter(3, java.sql.Types.VARCHAR);
miComando.execute();
private static byte[] readFully(File miPDF) throws FileNotFoundException, IOException {
FileInputStream fis = new FileInputStream(miPDF);
byte[] tmp = new byte[1024];
byte[] data = null;
int sz, len = 0;
while ((sz = fis.read(tmp)) != -1) {
if (data == null) {
len = sz;
data = tmp;
} else {
byte[] narr;
int nlen;
nlen = len + sz;
narr = new byte[nlen];
System.arraycopy(data, 0, narr, 0, len);
System.arraycopy(tmp, 0, narr, len, sz);
data = narr;
len = nlen;
if (len != data.length) {
byte[] narr = new byte[len];
System.arraycopy(data, 0, narr, 0, len);
data = narr;
return data;
}//fin readFully
This approach indicates that the PDF file is converted into an array of bytes, then is stored as binary in the BLOB field.
Thanx in advance, and looking forward for your comments.

You will probably need to use the setBinaryStream() method instead of setBytes().

Oracle error ORA-01461when trying to insert into an ORACLE BLOB field

I am getting Oracle error ‘ORA-01461: can bind a LONG value only for insert into a LONG column' when trying to insert into an ORACLE BLOB field. The error occurs when trying to insert a large BLOB (JPG), but does not occur when inserting a small (<1K) picture BLOB.(JPG). Any ideas?
BTW, when using a SQL Server datasource using the same code.... everything works with no problems.
ORACLE version is 11.2.0.1
The ORACLE datasource is JDBC using Oracle's JDBC driver ojdbc6.jar v11.2.0.1 (I also have tried ojdbc5.jar v11.2.0.1; ojdbc5.jar v11.2.0.4; and ojdbc6.jar v11.2.0.4 with the same error result.)
Here is my code:
<cfset file_mime = Lcase(Right(postedXMLRoot.objname.XmlText, 3))>
<cfif file_mime EQ 'jpg'><cfset file_mime = 'jpeg'></cfif>
<cfset file_mime = 'data:image/' & file_mime & ';base64,'>
<cfset image64 = ImageReadBase64("#file_mime##postedXMLRoot.objbase64.XmlText#")>
<cfset ramfile = "ram://" & postedXMLRoot.objname.XmlText>
<cfimage action="write" source="#image64#" destination="#ramfile#" overwrite="true">
<cffile action="readbinary" file="#ramfile#" variable="image_bin">
<cffile action="delete" file="#ramfile#">
<cfquery name="InsertImage" datasource="#datasource#">
INSERT INTO test_images
image_blob
SELECT
<cfqueryparam value="#image_bin#" cfsqltype="CF_SQL_BLOB">
FROM dual
</cfquery>

Can't you use "alter index <shema.spatial_index_name> rebuild ONLINE" ? Thanks. I could switch to "rebuild ONLINE" and see if that helps. Are there any potential adverse effects going forward, e.g. significantly longer rebuild than not using the ONLINE keyword, etc? Also wondering if spatial index operations (index type = DOMAIN) obey all the typical things you'd expect with "regular" indexes, e.g. B-TREE, etc.

Problems accessing fields in a CMP entity bean from a session bean

Hello everybody,
I'm getting the next problem: when I try to access a field in a CMP entity bean that I have instantiated from a session bean (trhoug entitybean.getNameOfField), I get the error "the entity bean does not exist in the database".
This entity bean is accessing a table in an external database (not the DB of the WAS), but I know that it's getting the correct data from the table, since I check the entitybean.size() and the entitybean.findByPrimaryKey(), and I get the right information. For some reason, the only thing that it doesn't work in the entity bean are the getter/setter methods (I created them automatically after having created the entity fields).
I access the entity bean through its local interface...
I know it's really difficult to give an answer with so few details, but... does anybody think I forgot something important to configure??
Thank very much in advance!!
Isidro

getter and setter methods for cmp-fields are abstract.
getter and setter methods for cmr-fields are abstract.
"John Lee" <[email protected]> wrote:
>
Hi:
Which method in a CMP Entity bean should be abstract? just only SetXXX
and
GetXXX?
Thanks!
John Lee

BLOB field in Entity CMP EJB (DB = Oracle)

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