UserDefined Type Question - Nested Table Attribute

I have a question about some types I'm trying to create and whether or not it's even possible .....
Here's the background ...
I have the following type i created :
create type asset_stat (
stat_current varchar2(50),
stat_change_date date,
stat_change_user varchar2(30)
All this type does is simply put a user and date/time stamp when constructed. I want to track status changes for historical tracking.
Then I want to create a nested table type of the above type as follows:
create type asset_stat_nt as table of asset_stat
Then, I have another type i've created which will have the nested table type created above as an attribute.
create type asset (
asset_name varchar2(30),
asset_type varchar2(3),
asset_stat asset_stat_nt
Now, the constructor for this asset type is defined like this: ( this is where i get lost)
constructor function asset (
asset_nm IN varchar2,
asset_type_cd in varchar2,
asset_stat_cd in varchar2 ) return self as result is
begin
self.asset_nm := asset_nm
self.asset_type := asset_type_cd ;
self.asset_stat := asset_stat_nt(asset_stat_cd);
return;
end;
I just created a table of asset type and tried to do an insert and I'm getting an error related to the line where the nested type is being assigned. Is this possible? If so is my syntax completely off? I'm not quite sure how to set values for the nested type because i want to keep all records of change. Any help would be greatly appreciated.
thanks

the block of code shows that asset_stat_nt is the type assigned to asset_stat inside the type asset as shown below
create type asset (
asset_name varchar2(30),
asset_type varchar2(3),
asset_stat asset_stat_nt
I guess for the following block of code, the line with the arrows should be given like shown below in bold letters
constructor function asset (
asset_nm IN varchar2,
asset_type_cd in varchar2,
asset_stat_cd in varchar2 ) return self as result is
begin
self.asset_nm := asset_nm
self.asset_type := asset_type_cd ;
self.asset_stat := asset_stat_nt(asset_stat_cd);return;
end;
[b][b]self.asset_stat := asset(asset_stat_nt(asset_stat_cd));
I am not pretty sure.......try it anyway.....if it works....good to you

Similar Messages

JDBC & changed object type in nested table

Once I add new column in object type in nested table.. I did step by step like it was wrinten in OraDoc..convert data e.t.c
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private int toLengthFromLocator(byte abyte0[])
after trying to execute this strane query in this method:
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public Datum unlinearize(byte abyte0[], long l, Datum datum, long l1, int i, work incorrect.. and cause call of this method..
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Type attribute with Object type or Nested table?

I have been creating lot many threads around the same problem, however i thought i knew but realized I do not know or else do not know how to..
I have created object type with an attribute READINGVALUE NUMBER(21,6)...How can i use type attribute on this object while declaring variable.....can we use type attribute on NESTED TABLES, similar to the db tables?
example
CREATE TYPE READING AS OBJECT(READINGVALUE NUMBER(21,6));
CREATE TABLE INTERVALREADINGS OF TYPE READING;

meghavee wrote:
Thanks Solomon, however this approach does not preserve precision/scale of number data type.....What you can do is create placeholder tables:
SQL> create table reading_type_placeholder of reading
2 /
Table created.
SQL> desc reading_type_placeholder
Name                                      Null?    Type
READINGVALUE                                       NUMBER(21,6)
SQL> declare
2      v_var reading_type_placeholder.readingvalue%type;
3 begin
4      v_var := 123456789012345;
5 end;
6 /
PL/SQL procedure successfully completed.
SQL> declare
2      v_var reading_type_placeholder.readingvalue%type;
3 begin
4      v_var := 1234567890123456;
5 end;
6 /
declare
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error: number precision too large
ORA-06512: at line 4
SQL>And if you modify type attribute:
SQL> alter type reading modify attribute readingvalue number(26,6) cascade;
Type altered.
SQL> desc reading_type_placeholder
Name                                      Null?    Type
READINGVALUE                                       NUMBER(26,6)
SQL>SY.

View of values in nested table attribute of object type

Hi,
I have:create or replace type ctx_line is object (
ctx_name varchar2(40),
ctx_value varchar2(1000)
create or replace type ctx_tab is table of ctx_line;
create type tp as object (
id      number,
ctx     ctx_tab
create table tt of tp nested table ctx store as ctx_nesttab;
create or replace view v as
SELECT VALUE(o).id as id
FROM tt o;Now I want to create an another view containing fields ctx_name, ctx_value and a key (maybe NESTED_TABLE_ID?) to the parent record in tt table. I must be able to join that view to each other. This is necessary because I will use that views in Forms 4.5 (which do not support nested tables).
Can someone help me, please?

I'm not sure what you are looking for exactly but is it something like this?
SELECT id
     , p.ctx_name
     , p.ctx_value
FROM   tt
     , TABLE(ctx) pWith the following test data:
INSERT INTO tt VALUES(1,CTX_TAB(CTX_LINE('A','SOME VALUE1')));
INSERT INTO tt VALUES(1,CTX_TAB(CTX_LINE('B','SOME VALUE2')));
INSERT INTO tt VALUES(1,CTX_TAB(CTX_LINE('B','SOME VALUE2')));this is the result:
SQL> SELECT id
2       , p.ctx_name
3       , p.ctx_value
4 FROM   tt
5       , TABLE(ctx) p
6 /
        ID CTX_NAME                                 CTX_VALUE
         1 A                                        SOME VALUE1
         1 B                                        SOME VALUE2
         1 B                                        SOME VALUE2

Nested tables of user defined types

Hello all,
I have philosophical question I am hoping someone can answer for me, "To TYPE, or not to TYPE; that is the question."
I have created several layers of nested tables in the form:
CREATE TYPE xyz AS OBJECT();
CREATE TYPE table_xyz AS TABLE OF xyz;
CREATE TYPE abc AS OBJECT(
nested_table1 table_xyz;
and so on until I end up creating a main table with all these sub tables nested into it.
But from what I understand oracle stores all of the information in a column of type NESTED TABLE into a single table, rather than one table per row. This means that if I declare a primary key in the nested table it will be against all values in the outer column, not just limited to the values in an individual row of the outer table. Plus it will not let me create foreign keys with in a nested table.
So why should I use the above construct instead of simply creating separate tables, and use primary and foreign keys to relate them and joins to query?
I can see the use for types in small cases (addresses, person, etc..) but I do not see the advantage of nested tables. Could someone shed some light on the subject for me?
Thanks,
Thomas

I'll state an opinion, for what it's worth. First, if you are going in the direction of types and nested tables or other collections, you are buying into Oracle's object-relational approach. This has pros and cons as far as design considerations, complexity, and performance that is too involved to get into here. If you just need master/detail table relationships, stick with traditional design techniques. Nested tables can make DML code complex and many tools can't deal with them so you end up having to unnest(flatten) the collections. I'd especially stay away from them if you require multiple nested tables or nested tables within nested tables.

Returning a nested table in a constructor function

Hi there is it possible to return a nested table in a Constructor Function or do I need to create a package?
I have this package spec it gives me an error
create or replace type
INTERFACE.PDE_BKRF_NTB
as table of
PDE_BKRF_TYP,
-- Define a constructor for REF_TYP_CD and REF_KEY to return a list.
constructor function
PDE_BKRF_TYP
(P_REF_TYP_CD varchar2
,P_REF_KEY number
,P_EXTR_DT date)
return SELF as result
/

No, a NESTED TABLE type can't have a constructor I think.
Check the documentation:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_8001.htm#i2121881
It distinguishes between object type, varray type and nested table type. Only object types can have constructors.
As a workaround you could create another object type that has an attribute of your nested table type:
Note: untested code
create or replace type
INTERFACE.PDE_BKRF_NTB
as table of
PDE_BKRF_TYP;
create or replace type INTERFACE.PDE_BKRF_NTB_2
as object (
a INTERFACE.PDE_BKRF_NTB,
constructor function
PDE_BKRF_NTB_2
(P_REF_TYP_CD varchar2
,P_REF_KEY number
,P_EXTR_DT date)
return SELF as result)
create or replace type body INTERFACE.PDE_BKRF_NTB_2
as
constructor function
PDE_BKRF_NTB_2
(P_REF_TYP_CD varchar2
,P_REF_KEY number
,P_EXTR_DT date)
return SELF as result as
/Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

Query nested table?

Let's say I have an object type "pair" with elements "name" and "value". I create a nested table type "pairtable" of type "pair". Then I create a view, "view", that has a column "nametable". The values in "nametable" are the result of a function that takes the value in the first column of the view, "id", and builds a nested table of type "pairtable" with the "names" and "values" associated with "id" that are stored in other tables. Clear as mud, yes?
If I type this into SQL+
select * from view where id = 100
I get
id col2 col3 col4 nametable
100 A B C pairtable(pair(aname, avalue)),pairtable(pair(bname, bvalue)),...
What I want is a cursor that contains only the "names" and "values" from a select number of "id"s.
What is the syntax?
Database is 8i, client is 9.2.
(p.s. Eventually I will want to call these name value pairs from .NET as a REF Cursor. For now I will settle for something that works in PL/SQL)

Ross,
OLEDB does not support object types or nested table. This restriction is limited by the Microsoft OLEDB specfication.
This forum is for ODP.NET. You may want to post this question to OLEDB forum.
Thanks
Martha

Inserting Data into nested table

I am exploring the differences between OBJECT & RECORD.
As i am still in process of learning, I found that both are structures which basically groups elements of different datatypes or columns of different datatypes, one is used in SQL and other is used in PL/SQL, please correct me if I am wrong in my understanding.
Below i am trying to insert data into an table of type object but i am unsuccessful can you please help.
CREATE OR REPLACE type sam as OBJECT
v1 NUMBER,
v2 VARCHAR2(20 CHAR)
---Nested Table---
create or replace type t_sam as table of sam;
--Inserting data----
insert into table(t_sam) values(sam(10,'Dsouza'));
Error Message:
Error starting at line 22 in command:
insert into table(t_sam) values(sam(10,'Dsouza'))
Error at Command Line:22 Column:13
Error report:
SQL Error: ORA-00903: invalid table name
00903. 00000 - "invalid table name"
*Cause:
*Action:

Ariean wrote:
So only purpose of equivalent SQL types concept of nested tables is to use them as one of the data types while defining an actual table?
Sort of - you can definitely use them for more than just "defining an actual table". (I'm fairly certain you could pass a nested table into a procedure, for example - try it, though - I'm not 100% sure on that - it just "makes sense". If you can define a type, you can use it, pass it around, whatever.).
Ariean wrote:
And that nested table could be a record in SQL or an Object in PLSQL or just simple datatype(number,varchar etc)?
Nested tables are just like any other custom data type. You can create a nested table of other data types. You can create a custom data type of nested tables.
It could get stupidly .. er, stupid O_0
CREATE TYPE o_myobj1 AS object ( id1   number, cdate1 date );
CREATE TYPE t_mytype1 AS table of o_myobj1;
CREATE TYPE o_myobj2 AS object ( id2   number, dumb t_mytype1 );
CREATE TYPE t_dumber AS table of o_myobj2;
O_0
Ok, my brain's starting to hurt - I hope you get the idea
Ariean wrote:
Secondly is my understanding correct about OBJECT & RECORD?
I can't think of any benefit of describing it another way.

Problem in truncate/drop partitions in a table having nested table columns.

Hi,
I have a table that has 2 columns of type nested table. Now in the purge process, when I try to truncate or drop a partition from this table, I get error that I can't do this (because table has nested tables). Can anybody help me telling how I will be able to truncate/drop partition from this table? IF I change column types from nested table to varray type, will it help?
Also, is there any short method of moving existing data from a nested table column to a varray column (having same fields as nested table)?
Thanks in advance.

>
I have a table that has 2 columns of type nested table. Now in the purge process, when I try to truncate or drop a partition from this table, I get error that I can't do this (because table has nested tables). Can anybody help me telling how I will be able to truncate/drop partition from this table?
>
Unfortunately you can't do those operations when a table has a nested table column. No truncate, no drop, no exchange partition at the partition level.
A nested table column is stored as a separate table and acts like a 'child' table with foreign keys to the 'parent' table. It is these 'foreign keys' that prevent the truncation (just like normal foreign keys prevent truncating partions and must be disabled first) but there is no mechanism to 'disable' them.
Just one excellent example (there are many others) of why you should NOT use object columns at all.
>
IF I change column types from nested table to varray type, will it help?
>
Yes but I STRONGLY suggest you take this opportunity to change your data model to a standard relational one and put the 'child' (nested table) data into its own table with a foreign key to the parent. You can create a view on the two tables that can make data appear as if you have a nested table type if you want.
Assuming that you are going to ignore the above advice just create a new VARRAY type and a table with that type as a column. Remember VARRAYs are defined with a maximum size. So the number of nested table records needs to be within the capacity of the VARRAY type for the data to fit.
>
Also, is there any short method of moving existing data from a nested table column to a varray column (having same fields as nested table)?
>
Sure - just CAST the nested table to the VARRAY type. Here is code for a VARRAY type and a new table that shows how to do it.
-- new array type
CREATE OR REPLACE TYPE ARRAY_T AS VARRAY(10) OF VARCHAR2(64)
-- new table using new array type - NOTE there is no nested table storage clause - arrays stored inline
CREATE TABLE partitioned_table_array
     ( ID_ INT,
      arra_col ARRAY_T )
     PARTITION BY RANGE (ID_)
     ( PARTITION p1 VALUES LESS THAN (40)
     , PARTITION p2 VALUES LESS THAN(80)
     , PARTITION p3 VALUES LESS THAN(100)
-- insert the data from the original table converting the nested table data to the varray type
INSERT INTO PARTITIONED_TABLE_ARRAY
SELECT ID_, CAST(NESTED_COL AS ARRAY_T) FROM PARTITIONED_TABLENaturally since there is no more nested table storage you can truncate or drop partitions in the above table
alter table partitioned_table_array truncate partition p1
alter table partitioned_table_array drop partition p1

Fill datagridview with Nested Table Object Type ???

Hello everybody, please you help me resolve my problem?
I follow this example: *(A Sample Application using Object-Relational features)* http://download-west.oracle.com/docs/cd/B14117_01/appdev.101/b10799/adobjxmp.htm
And this tutorial: *(Using Oracle User-Defined Types with .NET and Visual Studio)* http://www.oracle.com/technology/obe/hol08/dotnet/udt/udt_otn.htm
Now I have 3 Object Table: Stock, Customer and Purchase Order. With the tutorial it's OK to show the data of Stock and Customer Table [there is no nested table in], but I can't do this with table Purchase Order, the tutorial don't show how to work with Nested Table type [Missing or something ?]
When I try to display the data of table Purchase Order, I get the error:
typeName='LINEITEMLIST_NTABTYP'' is not specified or is invalid*
Follow the tutorial, I generate custom class for this UDT and get another error:
this.STOCK_REF = ((object)(Oracle.DataAccess.Types.OracleUdt.GetValue(con, pUdt, "STOCK_REF")));*
Argument Exception Unhandle: Object attribute is not mapped to a custom type member.*
Can You show me how to do this ? Show the data of the Nested Table in Visual Studio, do I have something wrong ??? Thanks and Best Regards.

I think you need to go through the tutorial more carefully. I think you are missing steps.
You are using a REF. Are you creating an object table for the objects to be stored in? Are you dereferencing the REF? This is covered by the Oracle by Example tutorial.
http://www.oracle.com/technology/obe/hol08/dotnet/udt/udt_otn.htm#t11
When you receive the nested table, it will be inside a .NET class. You can create this class by using the Create Custom Class menu item on the nested table type in server explorer.
This class will contain a ToString method and a ToXML method.
The question is, where are you attempting to display the data from this nested table? In a grid?
Does it make sense to display a nested table inside one cell of a grid? No. You would need to construct a special UI that will show the
nested table. Maybe the user clicks on the cell on the grid, which opens a new grid that displays the data. Or maybe there is a second grid on the form that always shows the nested table for the row that the first grid currently has selected.
I realize I am not providing you the code... but it sounds like you need to design a more sohisticated UI than what the tutorial is using -- one that can handle displaying one additional table per row.

Creating a type having a nested table of that type !!!!!

Hi all, my question may look ambigious, but it's better understood by this example: How can i do this??
CREATE TYPE MaterialType AS OBJECT (
     MaterialID          NUMBER,
     MaterialName          varchar2(20),
     CompatibleMaterials     MaterialsNT
CREATE TYPE MaterialsNT AS TABLE OF REF MaterialType;
In other words, how can i create 'MaterialType', having as attribute 'CompatibleMaterials', which is a nested table of 'MaterialType'

why don't you try nested tables?
prem

Java call stored procedure with nested table type parameter?

Hi experts!
I need to call stored procedure that contains nested table type parameter, but I don't know how to handle it.
The following is my pl/sql code:
create or replace package test_package as
type row_abc is record(
col1 varchar2(16),
col2 varchar2(16),
col3 varchar2(16 )
type matrix_abc is table of row_abc index by binary_integer;
PROCEDURE test_matrix(p_arg1 IN VARCHAR2,
p_arg2 IN VARCHAR2,
p_arg3 IN VARCHAR2,
p_out OUT matrix_abc
END test_package;
create or replace package body test_package as
PROCEDURE test_matrix(p_arg1 IN VARCHAR2,
p_arg2 IN VARCHAR2,
p_arg3 IN VARCHAR2,
p_out OUT matrix_abc
IS
v_sn NUMBER(8):=0 ;
BEGIN
LOOP
EXIT WHEN v_sn>5 ;
v_sn := v_sn + 1;
p_out(v_sn).col1 := 'col1_'||to_char(v_sn)|| p_arg1 ;
p_out(v_sn).col2 := 'col2_'||to_char(v_sn)||p_arg2 ;
p_out(v_sn).col3 := 'col3_'||to_char(v_sn)||p_arg3 ;
END LOOP ;
END ;
END test_package ;
My java code is following, it doesn't work:
Class.forName ("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection
("jdbc:oracle:thin:@10.16.102.176:1540:dev", "scott", "tiger");
con.setAutoCommit(false);
CallableStatement ps = null;
String sql = " begin test_package.test_matrix( ?, ? , ? , ? ); end ; ";
ps = con.prepareCall(sql);
ps.setString(1,"p1");
ps.setString(2,"p2");
ps.setString(3,"p3");
ps.registerOutParameter(4,OracleTypes.CURSOR);
ps.execute();
ResultSet rset = (ResultSet) ps.getObject(1);
error message :
PLS-00306: wrong number or types of arguments in call to 'TEST_MATRIX'
ORA-06550: line 1, column 8:
PL/SQL: Statement ignored
Regards
Louis

Louis,
If I'm not mistaken, record types are not allowed. However, you can use object types instead. However, they must be database types. In other words, something like:
create or replace type ROW_ABC as object (
col1 varchar2(16),
col2 varchar2(16),
col3 varchar2(16 )
create or replace type MATRIX_ABC as table of ROW_ABC
/Then you can use the "ARRAY" and "STRUCT" (SQL) types in your java code. If I remember correctly, I recently answered a similar question either in this forum, or at JavaRanch -- but I'm too lazy to look for it now. Do a search for the terms "ARRAY" and "STRUCT".
For your information, there are also code samples of how to do this on the OTN Web site.
Good Luck,
Avi.

Nested Tables and Predictable Attributes

BOL states "The data in a nested table can be used for prediction or for input, or for both. For example, you might have two nested table columns in a model: one nested table column might contain a list of the products that a customer
has purchased, while the other nested table column contains information about the customer's hobbies and interests, possibly obtained from a survey. In this scenario, you could use the customer's hobbies and interests as an input for analyzing purchasing behavior,
and predicting likely purchases."
However I cannot find where it states you cannot use a predictable attribute from a Nested Table within the Neural Network algorithm.
Can you please tell me why I receive the error "Microsoft Neural Network does not support predictable nested tables" when attempting to process my model with one predictable column in a Nested Table, or am I missing something? The
same structure works fine for Naive Bayes, Decision Trees etc but not for Neural Network of Logistic Regression.

Hi Namak,
Thank you for your question.
I am trying to involve someone more familiar with this topic for a further look at this issue. Sometime delay might be expected from the job transferring. Your patience is greatly appreciated.
Thank you for your understanding and support.
Regards,
Charlie Liao
TechNet Community Support

NESTED Tables for Sub-types when creating table for Super-type

If I create the following types, as an example:
Person with subtypes: Employee and Customer
Appointment
CREATE OR REPLACE TYPE Person_OT AS OBJECT (
person#                         NUMBER,
personSurname                    VARCHAR2(50),
personForenames               VARCHAR2(50),
personDateOfBirth               DATE,
personAddress                    Address_OT,
) NOT FINAL ;
CREATE OR REPLACE TYPE Employee UNDER Person_OT (
empSalary               NUMBER,
empNoSales          NUMBER,
makes               Appointment_List_OT
) FINAL ;
CREATE OR REPLACE TYPE Appointment_OT AS OBJECT (
some attributes
CREATE OR REPLACE TYPE Appointment_List_OT AS TABLE OF REF Appointment_OT ;
When creating the table to hold objects of Person type, how can the requisite nested table for representing 'makes' be declared? The below approach is not correct, however the table will not compile without naming the nested tables.
CREATE TABLE Person_TBL OF Person_OT (
Person#     PRIMARY KEY)
NESTED TABLE makes STORE AS Appointment_List_NTBL;
Advice very much appreciated!

CREATE TABLE Person_TBL OF Person_OT(
Person# PRIMARY KEY)
NESTED TABLE TREAT(SYS_NC_ROWINFO$ AS EMPLOYEE).MAKES STORE AS Appointment_List_NTBL
Table created.
SQL> select * from user_nested_tables
2 /
TABLE_NAME                     TABLE_TYPE_OWNER
TABLE_TYPE_NAME                PARENT_TABLE_NAME
PARENT_TABLE_COLUMN
STORAGE_SPEC                   RETURN_TYPE          ELEMENT_SUBSTITUTABLE
APPOINTMENT_LIST_NTBL          SCOTT
APPOINTMENT_LIST_OT            PERSON_TBL
TREAT(SYS_NC_ROWINFO$ AS "SCOTT"."EMPLOYEE")."MAKES"
                       DEFAULT                VALUE                         N
SQL> SY.

Using nested tables with User Defıned Types.....

Hi All,
I defined TEST_1 User Defined Type where VALUE_PART field is a VARCHAR2 type.
CREATE TYPE TEST_1 AS OBJECT (
               x NUMBER,
               y NUMBER,
     VALUE_PART VARCHAR2(50)
This TEST_1 object type will be used as nested tables in the EMPLOYEE table where each attribute might require different bytes of VARCHAR2’s in the VALUE_PART field.
CREATE TYPE NAME AS TABLE OF TEST_1;
CREATE TYPE ADDRESS AS TABLE OF TEST_1;
CREATE TYPE DEPARTMENT AS TABLE OF TEST_1;
CREATE TABLE EMPLOYEE (
SSN NUMBER,
NAME TEST_1,
ADDRESS TEST_1,
DEPARTMENT TEST_1,
SALARY NUMBER
NESTED TABLE NAME STORE AS NAME_TABLE;
NESTED TABLE ADDRESS STORE AS ADDRESS_TABLE;
NESTED TABLE DEPARTMENT STORE AS DEPARTMENT_TABLE;
Is it possible to specify VALUE_PART(50) in the TABLE OF statement?
Is there any way to do that throught methods or some other ways that I may not be aware of?
For Example:
/*This should allocate 10 bytes of VARCHAR2. */
CREATE TYPE NAME AS TABLE OF TEST_1(10);
/* and 30 bytes of VARCHAR2. */
CREATE TYPE ADDRESS AS TABLE OF TEST_1(30);
/*and 10 bytes of VARCHAR2. */
CREATE TYPE DEPARTMENT AS TABLE OF TEST_1(10);
Any help is appreciated.
Thanks a lot.

Hi,
We can not specify VALUE_PART(50) in the TABLE OF statement.
Regards,
Sailaja

UserDefined Type Question - Nested Table Attribute

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