Can't get struct from Oracle via Weblogic DB connection?

Question

There are two ways to connect oracle, within Weblogic or without Weblogic.
Without Weblogic way works. Code here:
import java.sql.Connection;
Class.forName("oracle.jdbc.driver.OracleDriver");
dbConn = DriverManager.getConnection("Connection");
StructDescriptor st = new StructDescriptor("Name of Object in Oracle ",dbConn);
Within Weblogic way doesn’t work. Code here:
import javax.naming.InitialContext;
import javax.sql.DataSource
import java.sql.Connection;
Connection conn = null;
javax.sql.DataSource ds = null;
ds = (javax.sql.DataSource) _cntx.lookup(poolName);
conn = ds.getConnection();
StructDescriptor st = new StructDescriptor("Name of Object in Oracle ",dbConn); // Error java.rmi.MarshalException: error marshalling return; nested exception is: java.io.NotSerializableException: oracle.jdbc.driver.T4CConnection
Reference:
http://e-docs.bea.com/wls/docs81/jdbc/thirdparty.html#1090291
I don’t know what the exact reason is. And my work is hanging by this thread. Could anyone help me pls? Thank you.

Answer 1

Man, what problem?
About how to use array,
CREATE TYPE department_type AS OBJECT (
DNO NUMBER (10),
NAME VARCHAR2 (50),
LOCATION VARCHAR2 (50)
CREATE TYPE dept_array AS TABLE OF department_type;
CREATE OR REPLACE PACKAGE objecttype AS
PROCEDURE insert_object (d dept_array);
END objecttype;
CREATE OR REPLACE PACKAGE BODY objecttype
AS
PROCEDURE insert_object (d dept_array)
AS
BEGIN
FOR i IN d.FIRST..d.LAST
LOOP
INSERT INTO department_teststruct
VALUES (d(i).dno,d(i).name,d(i).location);
END LOOP;
END insert_object;
END objecttype;
import java.sql.Connection;
import java.sql.DriverManager;
import oracle.jdbc.OracleCallableStatement;
import oracle.sql.ARRAY;
import oracle.sql.ArrayDescriptor;
import oracle.sql.STRUCT;
import oracle.sql.StructDescriptor;
public class TestStruct ...{
public static void main(String[] args)
sendStruct();
public static void sendStruct()
Connection dbConn = null;
try...{   
Object[] so1 = ...{"10","Accounts","LHR"};
Object[] so2 = ...{"20","HR","ISB"};
OracleCallableStatement callStatement = null;
Class.forName("oracle.jdbc.driver.OracleDriver");
dbConn = DriverManager.getConnection("jdbc:oracle:thin:@ServerName:Port:ORa", "UserName", "Password");
StructDescriptor st = new StructDescriptor("DEPARTMENT_TYPE",dbConn);
STRUCT s1 = new STRUCT(st,dbConn,so1);
STRUCT s2 = new STRUCT(st,dbConn,so2);
STRUCT[] deptArray = ...{s1,s2};
ArrayDescriptor arrayDept = ArrayDescriptor.createDescriptor("DEPT_ARRAY", dbConn);
ARRAY deptArrayObject = new ARRAY(arrayDept, dbConn, deptArray);
callStatement = (OracleCallableStatement)dbConn.prepareCall("{call insert_object(?)}");
((OracleCallableStatement)callStatement).setArray(1, deptArrayObject);
callStatement.executeUpdate();
dbConn.commit();
callStatement.close();
catch(Exception e)...{
System.out.println(e.toString());
About how to do explain plan
EXPLAIN PLAN FOR
SELECT * FROM TABLE(DEPT_ARRAY(DEPARTMENT_TYPE(
1, --DNO NUMBER (10),
'NAME', --NAME VARCHAR2 (50),
'LOCATION' --LOCATION VARCHAR2 (50)
))) T
JOIN TABLE2 T2 ON T.DNO = T2.DNO;
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);
But if u want let Oracle know how many rows in that array, one way follows can help.
Usually way:
EXPLAIN PLAN FOR
SELECT * FROM TABLE(DEPT_ARRAY(DEPARTMENT_TYPE(
1, --DNO NUMBER (10),
'NAME', --NAME VARCHAR2 (50),
'LOCATION' --LOCATION VARCHAR2 (50)
))) T
JOIN TABLE2 T2 ON T.DNO = T2.DNO;
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);
PLAN_TABLE_OUTPUT
1 Plan hash value: 1748000095
2
3 ----------------------------------------------------------------------------------------------
4 | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
5 ----------------------------------------------------------------------------------------------
6 | 0 | SELECT STATEMENT | | *8168* | 16336 | 24 (0)| 00:00:01 |
7 | 1 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | | | | |
8 ----------------------------------------------------------------------------------------------
When add cardinality parameter there, the result will be correct.
EXPLAIN PLAN FOR
SELECT /*+ cardinality(t 10 ) */ * FROM TABLE(DEPT_ARRAY(DEPARTMENT_TYPE(
1, --DNO NUMBER (10),
'NAME', --NAME VARCHAR2 (50),
'LOCATION' --LOCATION VARCHAR2 (50)
))) T
JOIN TABLE2 T2 ON T.DNO = T2.DNO;
SELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);
PLAN_TABLE_OUTPUT
1 Plan hash value: 1748000095
2
3 ----------------------------------------------------------------------------------------------
4 | Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
5 ----------------------------------------------------------------------------------------------
6 | 0 | SELECT STATEMENT | | 10 | 20 | 24 (0)| 00:00:01 |
7 | 1 | COLLECTION ITERATOR CONSTRUCTOR FETCH| | | | | |
8 ----------------------------------------------------------------------------------------------