How to call procedure with Object types in java

Question

Hi,
We have procedure declaration as follows
===============
TYPE TEST_TYPE AS OBJECT (NAME VARCHAR2(10));
TYPE TESTTYPE1 AS object (student1 TESTTYPE,student2 TESTTYPE,student3 TESTTYPE);
TYPE rect AS OBJECT
-- The type has 3 attributes.
length NUMBER,
width NUMBER,
area NUMBER,
-- Define a constructor that has only 2 parameters.
CONSTRUCTOR FUNCTION rect(length NUMBER, width NUMBER)
RETURN SELF AS RESULT
PROCEDURE G(obj1 in TESTTYPE1,obj2 out rect) as
n1 testtype;
n2 testtype;
n3 testtype;
n4 testtype;
begin
obj2 := NEW rect(10,20,200);
n1 := obj1.student1;
n2 := obj1.student2;
n3 := obj1.student3;
obj2.length :=20;
end;
=====================================================
I am not able to call the procedure in java code as I cannot figure out which out parameter type will it be registered using registeroutparameter. using cursor or struct type fails.
please let me know how I can pass values from stored procedure with objects to java.

Answer 1

I'm not sure what you're trying to accomplish with your procedure, but in general, this is an example of how you could use oracle.sql.STRUCT.
First, prepare your java.sql.CallableStatement using java.sql.CallableStatement cStmt = java.sql.Connection.prepareCall({ call G(?, ?) });
Note that you don't have to use the OracleCallableStatement. The java.sql.CallableStatement will work just fine.
For the IN parameter, you need to create three TEST_TYPE objects. Then you need to create one TESTTYPE1 object.
These will all be instances of oracle.sql.STRUCT.
To create a oracle.sql.STRUCT object you need a descriptor and a set of attributes. For example, to create a TEST_TYPE object you would do the following
1. StructDescriptor sd = StructDescriptor.createDescriptor("TEST_TYPE", java.sql.Connection).
2. Add a VARCHAR2 attribute to an array of attributes (e.g. Object[] attributes = new Object[]{"Student Name"})
3. oracle.sql.STRUCT struct = new oracle.sql.STRUCT(sd, java.sql.Connection, attributes)
Then do something similar to create the TESTTYPE1 object, except that the attribute array will contain three instances of TEST_TYPE struct objects.
To bind the IN parameter you need to use the java.sql.CallableStatement.setObject(1, <Instance of TESTTYPE1 object>).
To register the OUT parameter, you need to call java.sql.CallableStatement.registerOutParameter(2, oracle.jdbc.OracleTypes.STRUCT, "RECT").
Then, execute your procedure using cStmt.execute();
Retrieve your OUT parameter using oracle.sql.STRUCT struct = (oracle.sql.STRUCT)cStmt.getObject(2).
Once you've done that, to get the values of the attributes of all of your STRUCT objects, you need their descriptors and their metadata.