RE: type of an attribute

Hi Pradnesh
You have set off an interesting discussion. Here is what I guess must
have happened. You have n subclasses of datavalue class that require n+1
th subclass as an attribute. So why not promote that attribute to the
super class ?
Is it semantically valid ?Yes. I think it makes sense
Is it a good design ?I ask myself the following questions
- is it easy comprehend ?i.e., does it look natural or does it look
like trickery ?
- do I know how to make it work ?
- do I gain in coding ? (based amount of coding involved in the two
cases)
- does it cause difficulty in maintenance ?
Regards
Manjunatha Kubasada
Complete Business Solutions
[email protected]
(630) 271-3346
Disclaimer : Opinions expressed are my own
From: Dange, Pradnesh
To: '[email protected]'
Subject: type of an attribute
Date: Monday, July 14, 1997 3:17PM
Hi ,
In forte framework library I found following implementation:
The DataValue class has a attribute TextValue of type TextData. While
TextData class is sub-class of DataValue. This is a recusrive defination
of class.
This raises a question, can we have an attribute of a class of type
sub-class of the same class ? Is it semantically valid ? Is it a good
design ?
Pradnesh Dange
Indus Consultancy Services
201-261-3100

"Dange, Pradnesh" <[email protected]> writes:
The DataValue class has a attribute TextValue of type TextData.
While TextData class is sub-class of DataValue. This is a
recursive definition of class.
This raises a question, can we have an attribute of a class of
type sub-class of the same class ? Is it semantically valid ? My experience (Forte 2.0.H.1/2) says "yes, but you'd better be
careful how you get that attribute initialized". In my case, I
blindly "new-ed" the attribute in question in the Init method,
and Forte vanished without a trace as soon as any member of the
hierarchy got created. The solution was to find another place to
initialize the attribute. Making it virtual is one way to go,
but it was not necessary in my case, since it was a private
attribute anyway.
Is it a good design ?I have no idea. Forte did it, but that's indicative, not
definitive.
Tom Wyant

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Hello.
I have a problem enqueuing a user-defined type to the queue on Oracle 10g.
I'm using jdbc driver (ojdbc5.jar, version 11.1.0.6.0) as they provide oracle.jdbc.aq package.
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Then in test app:
package ru.invito;
import java.io.IOException;
import java.net.InetAddress;
import java.net.UnknownHostException;
import java.sql.SQLException;
import java.sql.Timestamp;
import java.util.Date;
import java.util.Properties;
import java.util.UUID;
import junit.framework.TestCase;
import oracle.jdbc.aq.AQAgent;
import oracle.jdbc.aq.AQEnqueueOptions;
import oracle.jdbc.aq.AQFactory;
import oracle.jdbc.aq.AQMessage;
import oracle.jdbc.aq.AQMessageProperties;
import oracle.jdbc.aq.AQEnqueueOptions.DeliveryMode;
import oracle.jdbc.aq.AQEnqueueOptions.VisibilityOption;
import oracle.jdbc.driver.OracleConnection;
import oracle.jdbc.driver.OracleDriver;
import oracle.sql.Datum;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class AqTest extends TestCase {
     protected Log logger = LogFactory.getLog(getClass());
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          OracleDriver dr = new OracleDriver();
          Properties prop = new Properties();
          prop.setProperty("user", Config.USERNAME);
          prop.setProperty("password", Config.PASSWORD);
          OracleConnection connection = (OracleConnection) dr.connect(Config.JDBC_URL, prop);
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          connection.setAutoCommit(false);
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          connection.commit();
     private void enqueueMessage(OracleConnection conn, String queueName, AQAgent[] recipients) throws SQLException,
               IOException {
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          AQMessageProperties props = makeProps(queueName);
          AQMessage mesg = AQFactory.createAQMessage(props);
          String msqText = String.format("Hello, %s!", queueName);
          FixedType data = createData(36, msqText);
          Datum d = data.toDatum(conn);
          STRUCT s = (STRUCT) d;
          debugStruct("s", s);
          String toIdStr = byteBufferToHexString(s.getDescriptor().getOracleTypeADT().getTOID(), 20);
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          byte[] mesgId = mesg.getMessageId();
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               throw new IllegalStateException("message id is NULL");
          String mesgIdStr = byteBufferToHexString(mesgId, 20);
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      * @throws SQLException
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          data.setCode(1);
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      * @param s
      * @throws SQLException
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          logger.debug(s + ".debugString(): " + s.debugString());
          logger.debug(s + "s.dump(): " + s.dump());
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      * @throws SQLException
     private AQAgent makeAgent() throws SQLException {
          AQAgent ag = AQFactory.createAQAgent();
          ag.setName("AQ_TEST");
          String agentAddress = null;
          try {
               agentAddress = InetAddress.getLocalHost().getHostAddress();
          catch (UnknownHostException e) {
               logger.error("cannot resolve localhost ip address. will not set it as AQ Agent address");
               agentAddress = "NA";
          ag.setAddress(agentAddress);
          return ag;
     private AQMessageProperties makeProps(String queueName) throws SQLException {
          final String EXCEPTION_Q_TEMPLATE = "AQ$_%sT_E";
          final int DEFAULT_DELAY = 0;
          final int DEFAULT_EXPIRATION = -1;
          final int DEFAULT_PRIORITY = 0;
          AQMessageProperties propeties = AQFactory.createAQMessageProperties();
          propeties.setCorrelation(UUID.randomUUID().toString());
          propeties.setDelay(DEFAULT_DELAY);
          propeties.setExceptionQueue(String.format(EXCEPTION_Q_TEMPLATE, queueName));
          propeties.setExpiration(DEFAULT_EXPIRATION);
          propeties.setPriority(DEFAULT_PRIORITY);
          // propeties.setRecipientList(null);//should not set
          propeties.setSender(makeAgent());
          return propeties;
      * @return
      * @throws SQLException
     private AQEnqueueOptions makeEnqueueOptions() throws SQLException {
          AQEnqueueOptions opt = new AQEnqueueOptions();
          opt.setRetrieveMessageId(true);
          // these are the default settings (if none specified)
          opt.setDeliveryMode(DeliveryMode.PERSISTENT);
          opt.setTransformation(null);
          opt.setVisibility(VisibilityOption.ON_COMMIT);
          return opt;
      * Form the AQ reference
      * @param buffer
      * @param maxNbOfBytes
      * @return
     private static final String byteBufferToHexString(byte[] buffer, int maxNbOfBytes) {
          if (buffer == null)
               return null;
          int offset = 0;
          StringBuffer sb = new StringBuffer();
          while (offset < buffer.length && offset < maxNbOfBytes) {
               String hexrep = Integer.toHexString((int) buffer[offset] & 0xFF);
               if (hexrep.length() == 1)
                    hexrep = "0" + hexrep;
               sb.append(hexrep);
               offset++;
          String ret = sb.toString();
          return ret;
}The output is following:
[main] 2008-07-03 19:09:49,863 DEBUG [ru.invito.AqTest] - ----------- Enqueue start ------------
[main] 2008-07-03 19:09:50,348 DEBUG [ru.invito.AqTest] - [email protected](): name = INVITO.FIXED_T5 length = 4 attribute[0] = 36 attribute[1] = Hell
o, INVITO.FIXED_T5Q! attribute[2] = 1 attribute[3] = 2008-07-03 19:09:49.0
[main] 2008-07-03 19:09:50,363 DEBUG [ru.invito.AqTest] - [email protected](): name = INVITO.FIXED_T5
length = 4
ID = 36
LABEL = Hello, INVITO.FIXED_T5Q!
CODE = 1
TODAY = 2008-07-03 19:09:49.0
[main] 2008-07-03 19:09:50,363 DEBUG [ru.invito.AqTest] - s.toIdStr: 507ccce5b6e9f572e040007f01007203
[main] 2008-07-03 19:09:50,363 DEBUG [ru.invito.AqTest] - sd.toXMLString(): <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<StructDescriptor sqlName="INVITO.FIXED_T5" >
<OracleTypeADT sqlName="INVITO.FIXED_T5" typecode="0" tds_version="1"
           is_embedded="false" is_top_level="true" is_upt="false" finalType="true" subtype="false">
    <attributes>
      <attribute name="ID" type="INTEGER" >
        <OracleType typecode="2" />
      </attribute>
      <attribute name="LABEL" type="VARCHAR2" >
        <OracleType typecode="12" />
      </attribute>
      <attribute name="CODE" type="INTEGER" >
        <OracleType typecode="2" />
      </attribute>
      <attribute name="TODAY" type="DATE" >
        <OracleType typecode="0" />
      </attribute>
    </attributes>
</OracleTypeADT>
</StructDescriptor>
[main] 2008-07-03 19:09:50,379 DEBUG [ru.invito.AqTest] - sending............
[main] 2008-07-03 19:09:50,395 DEBUG [ru.invito.AqTest] - Message ID from enqueue call: 511ff143bd4fa536e040007f01003192
[main] 2008-07-03 19:09:50,395 DEBUG [ru.invito.AqTest] - ----------- Enqueue done ------------But when dequeueing the 'label' attribute is lost:
DECLARE
dequeue_options     DBMS_AQ.dequeue_options_t;
message_properties DBMS_AQ.message_properties_t;
message_handle      RAW(16);
message             fixed_t5;
BEGIN
dequeue_options.navigation := DBMS_AQ.FIRST_MESSAGE;
DBMS_AQ.DEQUEUE(
     queue_name          =>     'fixed_t5q',
     dequeue_options     =>     dequeue_options,
     message_properties =>     message_properties,
     payload             =>     message,
     msgid               =>     message_handle);
DBMS_OUTPUT.PUT_LINE('ID   : '||message.id);
DBMS_OUTPUT.PUT_LINE('Label: '||message.label);
DBMS_OUTPUT.PUT_LINE('Code : '||message.code);
DBMS_OUTPUT.PUT_LINE('Today: '||message.today);
COMMIT;
END;
ID   : 36
Label:
Code : 1
Today: 03.07.08
Could anyone tell me what is wrong with the setup/code?
Why 'label' not saved in queue, though i saw it is not empty in STRUCT?

Thank you for the reply!
I have enqueued:
[main] 2008-07-04 15:30:30,639 DEBUG [ru.invito.UserDefinedTypeAqTest$1] - [email protected](): name = INVITO.FIXED_T5
length = 4
ID = 41
LABEL = Hello, INVITO.FIXED_T5Q!
CODE = 1
TODAY = 2008-07-04 15:30:30.0and in table (select * from FIXED_T5QT) the 'label' is blank:
Q_NAME     FIXED_T5Q
MSGID     51310809B5EA3728E040007F01000C79
CORRID     b8f38fd3-4fa6-4e0f-85d1-2440d02d655e
PRIORITY     0
STATE     0
DELAY
EXPIRATION
TIME_MANAGER_INFO
LOCAL_ORDER_NO     0
CHAIN_NO     0
CSCN     0
DSCN     0
ENQ_TIME     04.07.2008 15:28:44
ENQ_UID     INVITO
ENQ_TID                       4012
DEQ_TIME
DEQ_UID
DEQ_TID
RETRY_COUNT     0
EXCEPTION_QSCHEMA     AQ$_INVITO
EXCEPTION_QUEUE     FIXED_T5QT_E
STEP_NO     0
RECIPIENT_KEY     0
DEQUEUE_MSGID
SENDER_NAME     AQ_TEST
SENDER_ADDRESS     10.1.1.137
SENDER_PROTOCOL
USER_DATA.ID     41
USER_DATA.LABEL
USER_DATA.CODE     1
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FixedType data = new FixedType();
// hack: proper initialization for 'label' field
data._struct.setNChar(1);
data.setId(ID);
data.setLabel(label);
data.setCode(1);
Date today = new Date();
data.setToday(new Timestamp(today.getTime()));
Datum d = data.toDatum(connection);
STRUCT s = (STRUCT) d;
logger.debug(s + ".debugString(): " + s.debugString());
logger.debug(s + ".dump(): " + s.dump());and if i comment line (data._struct.setNChar(1);) the debug messages for created STRUCT also shows empty value for label.
But if i explicitly call data._struct.setNChar(1) then debug contains the label i defined in call to the setLabel method.

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lo_componentcontroller->execute_shp_extended_due_list( ).
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CAN U TELL ME ANY THING WRONG IN THIS??
tHANKS,
vENKY.
Edited by: venkys on Mar 8, 2011 9:52 AM

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3/12     PLS-00329: schema-level type has illegal reference to
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The only workaround I could think of was to keep the connection as a global variable in a PL/SQL package and then get it from there inside the methods. Of course this can be refined using an index by table and some object unique id to support multiple objects with their separate connections. But it still seems rather clumbsy - especially given that what I was looking for was the elegance of polymorphism.
Any tricks I don't know of?
I'm working in Oracle 10gR2.
best regards,
Jakob
Edited by: schmidt on Mar 21, 2011 10:52 PM

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     local_host     VARCHAR2(255),
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     newline          VARCHAR2(2),
     tx_timeout     INTEGER,
     private_sd     INTEGER
define     typeOf_SQL_BOOLEAN     = 'number'
define     SQL_BOOLEAN          = '&typeOf_SQL_BOOLEAN(1)'
define     SQL_TRUE          = 1
define     SQL_FALSE          = 0
create or replace type o_utl_smtp_connection is object (
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     port          INTEGER,          -- remote port number
     tx_timeout     INTEGER,          -- Transfer time out (in seconds)
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     private_state     INTEGER,          -- private, for implementation use
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          port                    IN          INTEGER DEFAULT 25,
          tx_timeout               IN          INTEGER DEFAULT NULL,
          wallet_path               IN          VARCHAR2 DEFAULT NULL,
          wallet_password               IN          VARCHAR2 DEFAULT NULL,
          secure_connection_before_smtp     IN          &typeOf_SQL_BOOLEAN DEFAULT &SQL_FALSE
     is
     begin
          self := SMTP_UTILS.toSqlConnection(SYS.UTL_SMTP.Open_Connection(
                    host
               ,     port
               ,     tx_timeout
               ,     wallet_path
               ,     wallet_password
               ,     nvl(secure_connection_before_smtp = &SQL_TRUE, false)
     end;
     member procedure writeData(
          self                    IN OUT NOCOPY     o_utl_smtp_connection,
          data                    IN          VARCHAR2 CHARACTER SET ANY_CS
     is
          conn     SYS.UTL_SMTP.Connection          := SMTP_UTILS.toPlSqlConnection(self);
     begin
          begin
               SYS.UTL_SMTP.Write_Data(conn, data);
               self := SMTP_UTILS.toSqlConnection(conn);
          exception
          when others then
               self := SMTP_UTILS.toSqlConnection(conn);
               raise;
          end;
     end;
end;
create or replace type o_test is object (
     attr1          number,
     attr2          o_utl_smtp_connection,
     member procedure doSomethingWithConnection
create or replace package SMTP_UTILS
is
     function toPLSQLConnection(aConnection in o_utl_smtp_connection)
     return SYS.UTL_SMTP.Connection;
     function toSQLConnection(aConnection in SYS.UTL_SMTP.Connection)
     return o_utl_smtp_connection;
end;
create or replace package body SMTP_UTILS
is
     function toPLSQLConnection(aConnection in o_utl_smtp_connection)
     return SYS.UTL_SMTP.Connection
     is
          result     SYS.UTL_SMTP.Connection;
     begin
          result.host                    := aConnection.host;
          result.port                    := aConnection.port;
          result.tx_timeout               := aConnection.tx_timeout;
          result.private_state               := aConnection.private_state;
          result.private_tcp_con.remote_host     := aConnection.private_tcp_con.remote_host;
          result.private_tcp_con.remote_port     := aConnection.private_tcp_con.remote_port;
          result.private_tcp_con.local_host     := aConnection.private_tcp_con.local_host;
          result.private_tcp_con.local_port     := aConnection.private_tcp_con.local_port;
          result.private_tcp_con.charset          := aConnection.private_tcp_con.charset;
          result.private_tcp_con.newline          := aConnection.private_tcp_con.newline;
          result.private_tcp_con.tx_timeout     := aConnection.private_tcp_con.tx_timeout;
          result.private_tcp_con.private_sd     := aConnection.private_tcp_con.private_sd;
          return     result;
     end;
     function toSQLConnection(aConnection in SYS.UTL_SMTP.Connection)
     return o_utl_smtp_connection
     is
          result     o_utl_smtp_connection;
     begin
          result.host                    := aConnection.host;
          result.port                    := aConnection.port;
          result.tx_timeout               := aConnection.tx_timeout;
          result.private_state               := aConnection.private_state;
          result.private_tcp_con.remote_host     := aConnection.private_tcp_con.remote_host;
          result.private_tcp_con.remote_port     := aConnection.private_tcp_con.remote_port;
          result.private_tcp_con.local_host     := aConnection.private_tcp_con.local_host;
          result.private_tcp_con.local_port     := aConnection.private_tcp_con.local_port;
          result.private_tcp_con.charset          := aConnection.private_tcp_con.charset;
          result.private_tcp_con.newline          := aConnection.private_tcp_con.newline;
          result.private_tcp_con.tx_timeout     := aConnection.private_tcp_con.tx_timeout;
          result.private_tcp_con.private_sd     := aConnection.private_tcp_con.private_sd;
          return     result;
     end;
end;
create or replace type body o_test is
     member procedure doSomethingWithConnection
     is
     begin
          -- Make SMTP calls thru connection object methods
          self.attr2.open();
     end;
end;
/Hope it helps.
Gerard
Edited by: gaverill on May 17, 2011 3:02 PM - formatted code

Issue with new 'Display Summary Type in Table' Attribute

JHeadstart Version: 10.1.3.1.26
JDeveloper Version: 10.1.3.1
We have configured our top level groups in our JHS Application Definition Editor to have each table's first column (Primary Key) set to 'count' for the 'Display Summary Type In Table' field level attribute.
Our problem is that now that we have this handy counting functionality, we found that it breaks the row focus when entering data in a table-forum. To be precise, when typing in or modifying the field that contains the defined 'count' attribute, when we 'tab off' from that field the page seems to run some JavaScript (the recounting of the rows I presume) and loses the keyboard's focus from that row. This outright prevents users from tabbing to the next field to continue entering data - which is rather important for our application.
I am presuming that this is a bug. Any ideas on how to fix it?

Erik, Michael,
I checked with ADF Faces development. I have a logged a bug for this against ADF Faces. Hopefully it will be solved in release 11.
There is nothing JHeadstart can do to fix this. Wherever we have autoSubmit=true generated on an item to get AJAX-style partial page requests (LOV item, summary item, depends on item), then tabbing out the field will loose the cursor, and pressing Save immediately after entering a value in the item will not save the data.
Steven Davelaar,
JHeadstart Team.

Taglib parsing error - cant see type parameter under attribute apparent

Hi,
I cannot determine why I'm getting the following error:
"org.apache.jasper.JasperException: XML parsing error on file /report-taglib.tld: Element type "type" must be declared."
It seems to me that I have clearly included the "<type>"
parameter (java.util.ArrayList) for the "container" attribute (see my taglib xml, below)...
Can you tell why the parser does not recognize it?
Appreciate any help.
[environment info]
OS: WIN2000
JAVA_HOME: C:\j2sdk1.4.0
J2EE_HOME: C:\j2sdkee.1.3.1
CATALINA_HOME: C:\jwsdp-1_0-ea1
[my taglib]
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">

<taglib>
<tlibversion>1.0</tlibversion>
<jspversion>1.1</jspversion>
<shortname>report-taglib</shortname>
<info>
          report taglib
</info>
<tag>
<name>report</name>
<tagclass>reportpackage.reporttags.ReportTagPROTO</tagclass>
<bodycontent>JSP</bodycontent>
<info>Includes body only if authorized by tag servlet</info>
<attribute>
     <name> numQuery </name>
     <required> true </required>
     <rtexprvalue> true </rtexprvalue>
</attribute>
<attribute>
     <name> showNumber </name>
     <required> true </required>
     <rtexprvalue> true </rtexprvalue>
</attribute>
<attribute>
     <name> container </name>
     <required> true </required>
     <rtexprvalue> true </rtexprvalue>
     <type> java.util.ArrayList </type>
</attribute>
</tag>
</taglib>

It appears that this error is a result of using the wrong jsp version. -thanks

Simple Types and Context Attributes

Hello All,
Can someone be kind enough to explain the difference between using a context attribute and a Simple Type ? For example... what's the difference (and I am sure there is ) between a context attribute "Name" that is declared to be of String type and a simple type "Name" that is of built-in type String ?
from
Kwok Wei

Some links on SimpleTypes and its usage.
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/webdynpro/value help in web dynpro applications.pdf
https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webas/webdynpro/internationalization of web dynpro applications.pdf
Regards, Anilkumar

Hot to get type from an attribute?

I have in class some attributes like...
private int cityCode;
private String city;When running, I would like to know which type is some of the attributes and it works fine for city because is String and I get from getClass().
But cityCode is native , so I can't try getClass().
Although I know it's int, I would like some way to let me know when executing. Does anyone know how to do it?
Thanks in advance.

Take a look at the wrappers that go along for each primitive type, in your case Integer. But anyways, I dont see why
1- you need to know its an int at runtime.
2- you are posting this in the swing forum. Take a look at the java tutorials and post in the appropriate forum.

[CS3 INX] Values for file type in LnkI attribute?

I've poked around in the C++ headers and all the relevant documentation I can find but can't find any definition of the possible values for the "file type" field in the Link Info array in CS3 INX files.
Anyone know here I can find the list of possible values?
I'm generating INX files with links and need to be able to generate the appropriate values based on the link targets.
Thanks,
Eliot

Hi
Pls tell me how did you resolve this issue. I am also facing the same problem.
Thanks
Prakash

Buildin Type "DBSequence" not available for PK Attribute in JDev 11.1.1.5

Hi,
I have JDev 11.1.1.5 and a (migrated) entity object.
The PK-Atribute is filled in Database using a Trigger and a sequence.
I set the attribute to *"Update while new"* and "*refresh after insert"*
Now I'd like to ste the type to +"DBSequence"+ as suggested in 4.10.10 How to Get Trigger-Assigned Primary Key Values from a Database Sequence. But I dont have the Entry +"DBSequence"+ in the +"Type" combobox.+
Even if I remove this attribute from the entity and add it again I'm not able to select the build in type +"DBSequence"+
How do I set the Type of that attribute to "DBSequence"?
bye
TPD

M.Jabr wrote:
Did you find it?No. :o(
If not, an alternative solution is to change the type to Number and assign that attribute a value from the sequence upon creation as explained in [url http://mjabr.wordpress.com/2011/03/11/make-sequence-number-as-default-value/]Set an attribute’s default value with a sequence number
This is no Option since ADF is not the only component making new Entries in that table and I dont want to change the working parts (yet...).
bye
TPD

RE: type of an attribute

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