Select on queue table

Question

Hi,
A Queue Table has been defined with payload type as SYS.AQ$_JMS_MESSAGE.
In java a property has been defined using setStringProperty("AdditionalMsgID",'123456').
Requirement is to get this property using sql SELECT statement.
Question is how can this be achieved.
By this "Requirement is to get this property using sql SELECT statement. "
what I mean is that this property can be used in selecting or sorting the messages by using it in "WHERE" clause or "ORDER BY" clause of sql "SELECT" statement.
I should be able to fire a SELECT statement from java using this property in the "ORDER BY" clause.
For Example:- SELECT * FROM MsgTable ORDER BY UserMsgID;
(where UserMsgID is a property defined in java for the message using setStringProperty() method.)
I should not have to dequeue or browse the message as that would mean getting the Message Body as well which can be very huge.
If I did not use JMS and instead I defined a simple type (structure) for holding the header and body of the message I am able to use that header in select statement. Similarly I wish if I could use the header or property defined in JMS as JMS payload is also built using type and type body.
Hoping for a concrete solution as our lots of problem would be solved if this works out.
Thanks & regards
Sanjeev
P.S. : I have posted a similar query in Advance queuing also but have not received any reply so I am posting it here hope one doesn't mind.
Message was edited by:
user453374

Answer 1

Hello
I've not used JMS myself but I've been having a dig round and I think you should be able to do what you're wanting to. This very simple example shows the principal:
CREATE OR REPLACE TYPE ot_Test_Type IS OBJECT
(     id     number,
     MEMBER FUNCTION GetProp(prop_name     IN VARCHAR2) RETURN NUMBER
CREATE OR REPLACE TYPE BODY ot_Test_Type
AS
     MEMBER FUNCTION GetProp(prop_name     IN VARCHAR2) RETURN NUMBER
     IS
          ln_Ret     NUMBER;
     BEGIN
          RETURN ASCII(prop_name);
     END;
END;
SQL> create table dt_test_ot_tab of ot_test_type;
Table created.
SQL> insert into dt_test_ot_tab values(ot_test_type(1));
1 row created.
SQL> select a.id from dt_test_ot_tab a where a.getprop('a') = 97;
        ID
         1
SQL> select a.id from dt_test_ot_tab a where a.getprop('b') = 97;
no rows selected
SQL> select a.id from dt_test_ot_tab a where a.getprop('b') = 98;
        ID
         1So from the documentation for AQ$_JMS_MESSAGE, there are member functions
MEMBER FUNCTION get_boolean_property (property_name   IN   VARCHAR)
RETURN   BOOLEAN,
MEMBER FUNCTION get_byte_property    (property_name   IN   VARCHAR)
RETURN   INT,
MEMBER FUNCTION get_short_property   (property_name   IN   VARCHAR)
RETURN   INT,
MEMBER FUNCTION get_int_property     (property_name   IN   VARCHAR)
RETURN   INT,
MEMBER FUNCTION get_long_property    (property_name   IN   VARCHAR)
RETURN   NUMBER,
MEMBER FUNCTION get_float_property   (property_name   IN   VARCHAR)
RETURN   FLOAT,
MEMBER FUNCTION get_double_property  (property_name   IN   VARCHAR)
RETURN   DOUBLE PRECISION,
MEMBER FUNCTION get_string_property  (property_name   IN   VARCHAR)
RETURN   VARCHAR);Which you should be able to call in the where caluse of a select on that table in a similar way to the example above. The main thing I found is that you need to alias the table to be able to call the function.
HTH
David
Message was edited by:
david_tyler
Oops! Forgot to put in the create table bit :-)