Difference between Datasource and Connection Pool

Hi,
What is the major difference between Datasource and Connection Pool.
Both the Datasource with JNDI and Connectio Pool will serve the pool of connections. Then what is the difference.
regards,
Raj

A datasource is not implicitly a connection pool. You can configure that in the datasource properties. A connection pool is also not implicitly a datasource. You can create your own connection pool using the java.sql interfaces. A datasource just gives the ability to acquire the connections and access the database through JNDI. A connection pool just gives the ability to reuse a set of connections which are created/closed/controlled by the connection pool logic.

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Difference between session and connection

Not sure this is the right place for this, but I am not able to find a proper definition between these 2 terms.
What is the difference between session and connection, theoritically speaking ?

Hello
In order to get the meaning of terms Connection and Session let's define first the term Flow.
The definition of a Flow is historically accepted as:
A unidirectional sequence of packets between 2 network endpoints that have the following 7 things in common:
1. Source IP address
2. Destination IP address
3. L3 Protocol type
4. Source port
5. Destination port
6. Tos (Type of Service)
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The terms Connection and Session can have many different meanings depending on the framework that they are used, but it can be said that:
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Session: Many connections between the same source and same destination
HTH

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Hi,
Can someone help me in finding the difference between using oracle.jdbc.pool.OracleConnectionPoolDataSource with OraclePooledConnection and oracle.jdbc.pool.OracleConnectionPoolDataSource with Connection.
Thanks in advance.
Sindhiya V.

Hello
In order to get the meaning of terms Connection and Session let's define first the term Flow.
The definition of a Flow is historically accepted as:
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What's the difference between using a connection pool and a datasource

Howdy. I figure this is a newbie question, but I can't seem to find an
answer.
In the docs at bea, the datasource docs say
"DataSource objects provide a way for JDBC clients to obtain a DBMS
connection. A DataSource is an interface between the client program and the
connection pool. Each data source requires a separate DataSource object,
which may be implemented as a DataSource class that supports either
connection pooling or distributed transactions."
In there it says the datasource uses the connection pool, but other than
that, what is the difference between a connection pool and a datasource?

Thanks for the info. I think it makes some sense. But it's a bit greek.
I'm sure it'll make more sense the more I work with it. Thanks.
"Chuck Nelson" <[email protected]> wrote in message
news:3dcac1f5$[email protected]..
>
Peter,
Here is a more formal definition of a DataSource from the Sun site
"A factory for connections to the physical data source that thisDataSource object
represents. An alternative to the DriverManager facility, a DataSourceobject
is the preferred means of getting a connection. An object that implementsthe
DataSource interface will typically be registered with a naming servicebased
on the JavaTM Naming and Directory (JNDI) API.
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Connection pooling implementation -- produces a Connection object thatwill automatically
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Distributed transaction implementation -- produces a Connection objectthat may
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almost always with a connection pooling manager.
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DRE
BEA Technical Support

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I took the liberty to migrate my OLD BEA WebLogic v8.1.3 domain (i.e. sample) to Oracle WebLogic v10.3. Everything appears to run smoothly BUT when I try to connect to the Hypersonic Database I had from the OLD environment, I get connection errors (i.e. weblogic.common.ResourceException). I can see from the NEW 10.3 environment that the migration utility creates two (2) datasources (sampleDS and samplePool). However, when clicking through the screens, I do not see how sampleDS refers to the samplePool out of the box from the migration utility. When I start the WebLogic domain with startWebLogic.cmd...here is the code to launch the actual DB instance:
cd hsqldb
start "Sample DB (HSQLDB)" %JAVA_HOME%\bin\java -classpath hsqldb.jar -Xms32m -Xmx128m org.hsqldb.Server -database sampleDB -port 15553 -silent false -trace false
cd ..
This works quite well and launches a window that has the following:
| Sample DB (HSQLDB)
| server.properties not found, using command line or default properties
| Opening database: sampleDB
| server.port =15553
| server.database =sampleDB
| server.silent =false
| HSQLDB server 1.7.1 is running
| Use SHUTDOWN to close normally, Use [CTRL] + [C] to abort abruptly
| Wed Jun 16 10:18:48 EDT 2010 Listening for connections ...
|_________________________________________________________
This is the right screen and confirms my database is up and running and waiting for connections. Somehow, when I migrated from 8.1 to 10.3 something is not configured correctly and my sampleDS is not properly leveraging the samplePool. Can anyone shed any light on this problem?
I have went through most of the posts and can not seem to understand what happens to the DS and Pools during the migration and specifically how do I reconnect the two to ensure that I can connect to the database. The app is up and running fine in WebLogic v10.3 but without the dB connection, I am stuck at the login screen.
Thanks for any help...

I took the liberty to migrate my OLD BEA WebLogic v8.1.3 domain (i.e. sample) to Oracle WebLogic v10.3. Everything appears to run smoothly BUT when I try to connect to the Hypersonic Database I had from the OLD environment, I get connection errors (i.e. weblogic.common.ResourceException). I can see from the NEW 10.3 environment that the migration utility creates two (2) datasources (sampleDS and samplePool). However, when clicking through the screens, I do not see how sampleDS refers to the samplePool out of the box from the migration utility. When I start the WebLogic domain with startWebLogic.cmd...here is the code to launch the actual DB instance:
cd hsqldb
start "Sample DB (HSQLDB)" %JAVA_HOME%\bin\java -classpath hsqldb.jar -Xms32m -Xmx128m org.hsqldb.Server -database sampleDB -port 15553 -silent false -trace false
cd ..
This works quite well and launches a window that has the following:
| Sample DB (HSQLDB)
| server.properties not found, using command line or default properties
| Opening database: sampleDB
| server.port =15553
| server.database =sampleDB
| server.silent =false
| HSQLDB server 1.7.1 is running
| Use SHUTDOWN to close normally, Use [CTRL] + [C] to abort abruptly
| Wed Jun 16 10:18:48 EDT 2010 Listening for connections ...
|_________________________________________________________
This is the right screen and confirms my database is up and running and waiting for connections. Somehow, when I migrated from 8.1 to 10.3 something is not configured correctly and my sampleDS is not properly leveraging the samplePool. Can anyone shed any light on this problem?
I have went through most of the posts and can not seem to understand what happens to the DS and Pools during the migration and specifically how do I reconnect the two to ensure that I can connect to the database. The app is up and running fine in WebLogic v10.3 but without the dB connection, I am stuck at the login screen.
Thanks for any help...

DataSource Vs Connection Pooling

What is the difference between Datasource and Connection Pool, and what is the advantages of using both.can any one plz explain me..

Hi,
Without creating a Connection Pool, one can not create a Data Source.
Connection Pool refers to the DataBase URL, Driver Class, User-Id and Password for the database.
Data Source refers to the Connection Pool created above for the particular database.
And to get connection from the DataSource:
DataSource ds = (javax.sql.DataSource)initCtx.lookup("JNDI-NAME");
Connection conn = ds.getConnection();
sameer

Dynamic datasources and connnection pools cont...

sorry.. i got an error when replying to the original message..
Thanks for the quick response. I'm assuming this applies to datasources as well. So, there's not much WL overhead with creating hundreds datasources and connection pools up front?
Ken

Ken Yeung wrote:
sorry.. i got an error when replying to the original message..
Thanks for the quick response. I'm assuming this applies to datasources as well. So, there's not much WL overhead with creating hundreds datasources and connection pools up front?
Kencorrect.

Difference between closing the connection before and after committing user transaction?

          I was wondering what's the difference between closing the connection before committing
          the transaction versus closing the connection after committing the transaction?...
          for e.g....
          Scenario 1.........
          UserTransaction useretran;
          usertran.begin();
          Connection con = datasource.getCOnnection();
          // do bunch of stuff...
          conn.close();
          usertran.commit()
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          UserTransaction useretran;
          usertran.begin();
          Connection con = datasource.getCOnnection();
          // do bunch of stuff...
          usertran.commit()
          conn.close();
          thanks....
          Srini


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connections, and I always recommend putting the close() in a finally block
so it's guaranteed to happen.
Joe
srinivas wrote:
I was wondering what's the difference between closing the connection before committing
the transaction versus closing the connection after committing the transaction?...
for e.g....
Scenario 1......... UserTransaction useretran; usertran.begin(); Connection con =
datasource.getCOnnection(); // do bunch of stuff... conn.close(); usertran.commit()
Scenario 2... UserTransaction useretran; usertran.begin(); Connection con = datasource.getCOnnection();
// do bunch of stuff... usertran.commit() conn.close();
thanks....
Srini

Difference between poh and pov in module pool programming

hi all,
                   pls tell me difference between poh and pov and how i check validation in screen

Hi,
POV gives you F4 help.
like:
You can call dialog modules in the POV event using the event keyword PROCESS ON VALUE-REQUEST.
PROCESS ON VALUE-REQUEST.
FIELD f MODULE mod.
After the PROCESS ON VALUE-REQUEST statement, you can only use the MODULE statement together with the FIELD statement. When the user chooses F4 for a field f, the system calls the module mod belonging to the FIELD statement. If there is more than one FIELD statement for the same field f, only the first is executed. The module mod is defined in the ABAP program like a normal PAI module. However, the contents of the screen field f are not available, since it is not transported by the FIELD statement during the PROCESS ON HELP-REQUEST event. You can now program your own value lists in the module. However, this procedure is only recommended if it really is not possible to use a search help. Defining search helps is much easier than PROCESS ON VALUE-REQUEST, since the system takes over some of the standard operations, such as getting field contents from the screen. It also ensures that the F4 help has a uniform look and feel throughout the system. Furthermore, it means that you do not have to reassign input help to fields on each screen.
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Calls the input help of the ABAP Dictionary dynamically. You can pass the component names of a structure or database table of the ABAP Dictionary to the function module in the import parameters TABNAME and FIELDNAME. The function module starts the ABAP Dictionary input help for this component. All of the relevant screen fields are read. If you specify the import parameters DYNPPROG, DYNPNR, and DYNPROFIELD, the users selection is returned to the corresponding field on the screen. If you specify the table parameter RETURN_TAB, the selection is returned into the table instead.
·        F4IF_INT_TABLE_VALUE_REQUEST
This function module displays a value list that you created in an ABAP program. The self-programmed value list is passed to the function module as the table parameter VALUE_TAB. If you specify the import parameters DYNPPROG, DYNPNR, and DYNPROFIELD, the users selection is returned to the corresponding field on the screen. If you specify the table parameter RETURN_TAB, the selection is returned into the table instead.
There are also two function modules - DYNP_VALUES_READ and DYNP_VALUES_UPDATE - that can read the values of screen fields and return values to them during the POV event. For further information, refer to the relevant function module documentation.
Input help in dialog modules
REPORT demo_dynpro_f4_help_module.
TYPES: BEGIN OF values,
         carrid TYPE spfli-carrid,
         connid TYPE spfli-connid,
       END OF values.
DATA: carrier(3) TYPE c,
      connection(4) TYPE c.
DATA: progname TYPE sy-repid,
      dynnum   TYPE sy-dynnr,
      dynpro_values TYPE TABLE OF dynpread,
      field_value LIKE LINE OF dynpro_values,
      values_tab TYPE TABLE OF values.
CALL SCREEN 100.
MODULE init OUTPUT.
progname = sy-repid.
dynnum   = sy-dynnr.
CLEAR: field_value, dynpro_values.
field_value-fieldname = 'CARRIER'.
APPEND field_value TO dynpro_values.
ENDMODULE.
MODULE cancel INPUT.
LEAVE PROGRAM.
ENDMODULE.
MODULE value_carrier INPUT.
CALL FUNCTION 'F4IF_FIELD_VALUE_REQUEST'
       EXPORTING
            tabname     = 'DEMOF4HELP'
            fieldname   = 'CARRIER1'
            dynpprog    = progname
            dynpnr      = dynnum
            dynprofield = 'CARRIER'.
ENDMODULE.
MODULE value_connection INPUT.
CALL FUNCTION 'DYNP_VALUES_READ'
       EXPORTING
            dyname             = progname
            dynumb             = dynnum
            translate_to_upper = 'X'
       TABLES
            dynpfields         = dynpro_values.
READ TABLE dynpro_values INDEX 1 INTO field_value.
SELECT carrid connid
    FROM spfli
    INTO CORRESPONDING FIELDS OF TABLE values_tab
    WHERE carrid = field_value-fieldvalue.
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
       EXPORTING
            retfield    = 'CONNID'
            dynpprog    = progname
            dynpnr      = dynnum
            dynprofield = 'CONNECTION'
            value_org   = 'S'
       TABLES
            value_tab   = values_tab.
ENDMODULE.
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like:
If data element supplement documentation is insufficient for your requirements, or you want to display help for program fields that you have not copied from the ABAP Dictionary, you can call dialog modules in the POH event:
PROCESS ON HELP-REQUEST.
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HELP_OBJECT_SHOW_FOR_FIELD
This function module displays the data element documentation for components of any structure or database table from the ABAP Dictionary. You pass the name of the component and structure or table to the import parameters FIELD and TABLE.
HELP_OBJECT_SHOW
Use this function module to display any SAPscript document. You must pass the document class (for example, TX for general texts, DE for data element documentation) and the name of the document to the import parameters DOKCLASS and DOKNAME. For technical reasons, you must also pass an empty internal table with the line type TLINE to the tables parameter of the function module.
For further information about how to create SAPscript documents, refer to the Documentation of System Objects documentation.
Field help on screens.
REPORT DEMO_DYNPRO_F1_HELP.
DATA: TEXT(30),
       VAR(4),
       INT TYPE I,
       LINKS TYPE TABLE OF TLINE,
       FIELD3, FIELD4.
TABLES DEMOF1HELP.
TEXT = TEXT-001.
CALL SCREEN 100.
MODULE CANCEL INPUT.
LEAVE PROGRAM.
ENDMODULE.
MODULE F1_HELP_FIELD2 INPUT.
INT = INT + 1.
CASE INT.
    WHEN 1.
    VAR = '0100'.
    WHEN 2.
    VAR = '0200'.
    INT = 0.
ENDCASE.
ENDMODULE.
MODULE F1_HELP_FIELD3 INPUT.
CALL FUNCTION 'HELP_OBJECT_SHOW_FOR_FIELD'
       EXPORTING
            DOKLANGU                      = SY-LANGU
            DOKTITLE                      = TEXT-002
            CALLED_FOR_TAB                = 'DEMOF1HELP'
            CALLED_FOR_FIELD              = 'FIELD1'.
ENDMODULE.
MODULE F1_HELP_FIELD4 INPUT.
CALL FUNCTION 'HELP_OBJECT_SHOW'
       EXPORTING
            DOKCLASS                      = 'TX'
            DOKLANGU                      = SY-LANGU
            DOKNAME                       = 'DEMO_FOR_F1_HELP'
            DOKTITLE                      = TEXT-003
       TABLES
            LINKS                         = LINKS.
ENDMODULE.
Regards,
Renjith Michael

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