Relations in model
Hi
I my Web Dynpro application I have to deal with some relations to create the model because I am importing a bean which is having a List(Collection). Is there any good document explaining how to resolve the relations and use them in the Web Dynpro project? If there is some good stuff for this can anybody please share that with me?
Thanks & regards,
Sujit
Hi Sujit,
When you import using the Bean model the relations are already defined based on the structure of the bean. Lets imagine ORder with relation 0..n with OrderITem...So in Order you will define set/getters that accept and return a ArrayList...During the import you will be prompted as to what you want to map this to ..
Hope this helps..
Regards,
Arun
Similar Messages
-
Insert XML file into Relational database model without using XMLTYPE tables
Dear all,
How can I store a known complex XML file into an existing relational database WITHOUT using xmltypes in the database ?
I read the article on DBMS_XMLSTORE. DBMS_XMLSTORE indeed partially bridges the gap between XML and RDBMS to a certain extent, namely for simply structured XML (canonical structure) and simple tables.
However, when the XML structure will become arbitrary and rapidly evolving, surely there must be a way to map XML to a relational model more flexibly.
We work in a java/Oracle10 environment that receives very large XML documents from an independent data management source. These files comply with an XML schema. That is all we know. Still, all these data must be inserted/updated daily in an existing relational model. Quite an assignment isn't it ?
The database does and will not contain XMLTYPES, only plain RDBMS tables.
Are you aware of a framework/product or tool to do what DBMS_XMLSTORE does but with any format of XML file ? If not, I am doomed.
Constraints : Input via XML files defined by third party
Storage : relational database model with hundreds of tables and thousands of existing queries that can not be touched. The model must not be altered.
Target : get this XML into the database on a daily basis via an automated process.
Cheers.
Luc.Luc,
your Doomed !
If you would try something like DBMS_XMLSTORE, you probably would be into serious performance problems in your case, very fast, and it would be very difficult to manage.
If you would use a little bit of XMLType stuff, you would be able to shred the data into the relational model very fast and controlable. Take it from me, I am one of those old geezers like Mr. Tom Kyte way beyond 40 years (still joking). No seriously. I started out as a classical PL/SQL, Forms Guy that switched after two years to become a "DBA 1.0" and Mr Codd and Mr Date were for years my biggest hero's. I have the utmost respect for Mr. Tom Kyte for all his efforts for bringing the concepts manual into the development world. Just to name some off the names that influenced me. But you will have to work with UNSTRUCTURED data (as Mr Date would call it). 80% of the data out there exists off it. Stuff like XMLTABLE and XML VIEWs bridge the gap between that unstructured world and the relational world. It is very doable to drag and drop an XML file into the XMLDB database into a XMLtype table and or for instance via FTP. From that point on it is in the database. From there you could move into relational tables via XMLTABLE methods or XML Views.
You could see the described method as a filtering option so XML can be transformed into relational data. If you don't want any XML in your current database, then create an small Oracle database with XML DB installed (if doable 11.1.0.7 regarding the best performance --> all the new fast optimizer stuff etc). Use that database as a staging area that does all the XML shredding for you into relational components and ship the end result via database links and or materialized views or other probably known methodes into your relational database that isn't allowed to have XMLType.
This way you would keep your realtional Oracle database clean and have the Oracle XML DB staging database do all the filtering and shredding into relational components.
Throwing the XML DB option out off the window beforehand would be like replacing your Mercedes with a bicycle. With both you will be able to travel the distance from Paris to Rome, but it will take you a hell of lot longer.
:-) -
Data Modeler: Relational data model questions
1. Can a different notation be specified for relational data models' constraints? Specifically, I'd like crow's feet. BTW, the docs show crow's feet and parent pointer (with the arrowhead), but there's no such thing in the actual modeler.
2. Is there any way to manually route FK constraints lines?
3. When forward engineering from logical, is there any way to indicate the preferred name for keys and indexes (primary, unique, foreign)?
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Man, do I ever miss Designer!
Thanks,
PatrickHere's one more question:
I've transformed several super/sub entities to relational, and some of the tables do not allow me to open Properties (on the table). I can use the navigator to open column properties, but cannot open table properties (neither from diagrammer nor from navigator). Some of the tables are two or three subtype levels deep, and I haven't figured out why some open and some don't. -
Relational/physical model missing
Hi,
Yesterday engineered and saved relational/physical models appear missing today. I'm using new version 3.3.0.747. Yesterday I luckily already generated ddl -scripts and run it in database so now i can import tables etc from there.
I checked the xml -files and there it is (including everything-> tables, tablespaces, etc. etc), but the Data Modeler Design Browser can't find it at all.
Kind regards, user12957891I was about to post something similar. The entities I created in the last week or so aren't on the logical view (the visible one) anymore. (The 50 or so older than that are, and they're in the relational view.) They're in the browser's list of entities, and some of them are where they're supposed to be on a subview. But if I do right-click on one of them in the browser list, do "Go to Diagram->Logical", nothing happens. If I drag one from the browser list to the view, it shows as "Whatever:1", as if it was already there somewhere.
In my case, it's possible there was versioning involved. I was going to check in new changes but couldn't because of conflicts. One was for "logical view". I accepted for merging some changes, and I remember seeing some "to delete" ones for these newish entities, but the checkbox wasn't checked for those and I didn't check them. I'm not sure if these entities were on the visible view before I merged in the pending changes today. My partner's model seems to be the same as mine at this point (newish entities in the browser list but not in the big white view), so I'm not sure what happened or how to get them to appear again. -
Way of relates root model objects
Hi,
I am trying to Model Objects relates Root Model node.
For testing purpose i want call RFC Module, but i can't
bind some model objects.
I have put following code in wdDoInit() method of ComponentController.
"Bapi_Pr_Create_Input" is Called RFC name.
"Bapimereqheader","Bapimereqheaderx","Bapimereqitem","Bapimereqitemx" are
model object for Child Node of Root Object "Bapi_Pr_Create_Input".
Among these, "Bapimereqitem" and "Bapimereqitemx" are tables parameter.
These is used by Bapi_Pr_Create_Input's tables parameter, can't relates Root
Model though "Bapimereqheader" can do it. I don't understand this reason.
"Prheader" -> created by "Bapimereqheader"
"Prheaderx" -> created by "Bapimereqheaderx"
"Pritem" -> created by "Bapimereqitem"
"Pritemx" -> created by "Bapimereqitemx"
//@@begin javadoc:wdDoInit()
/** Hook method called to initialize controller. */
//@@end
public void wdDoInit()
//@@begin wdDoInit()
pr_input = new Bapi_Pr_Create_Input();
wdContext.nodeBapi_Pr_Create_Input().bind(pr_input);
header = new Bapimereqheader();
headerx = new Bapimereqheaderx();
item = new Bapimereqitem(); <----Table Parameter
itemx = new Bapimereqitemx(); <----Table Patameter
pr_input.setPrheader(header);
pr_input.setPrheaderx(headerx);
pr_input.setPritem(item); <----Error
pr_input.setPritemx(itemx); <----Error
What am I doing wrong in above code.
Please help me.
Sincerely,
y.iwataHi,
Please try with
pr_input.setTableParameter for following 2 rows.
pr_input.setPritem(item); <----Error
pr_input.setPritemx(itemx); <----Error
regards,
Ganga -
Hi, I am facing to choose an DBMS product for a big project. Does 8i support an object-oriented or object-relational data model?
Thank you!<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by xuechen:
Hi, I am facing to choose an DBMS product for a big project. Does 8i support an object-oriented or object-relational data model?
Thank you!<HR></BLOCKQUOTE>
Hi, Oracle8 and Oracle8i will provide you object relational model. It is not pure object-oriented solution. In the field of databases it is difficult to impliment pure object-oriented solution now a days. But it is easy to understand and design an object-relational design and implimentation. In Oracle8 there are some very useful facilities for such a design like the concept of nested tables. I had a project of defence nature and design in object-relational technique and find much easy and understandable then pure relational approach. If it is possible for you then please be contect with me on mail and send me a little information about your work and experience.
Regards,
Awais
null -
Insert XML file into Relational database model - no XMLTYPE!
Dear all,
How can I store a known complex XML file into an existing relational database WITHOUT using xmltypes in the database ?
I read the article on DBMS_XMLSTORE. DBMS_XMLSTORE indeed partially bridges the gap between XML and RDBMS to a certain extent, namely for simply structured XML (canonical structure) and simple tables.
However, when the XML structure will become arbitrary and rapidly evolving, surely there must be a way to map XML to a relational model more flexibly.
We work in a java/Oracle10 environment that receives very large XML documents from an independent data management source. These files comply with an XML schema. That is all we know. Still, all these data must be inserted/updated daily in an existing relational model. Quite an assignment isn't it ?
The database does and will not contain XMLTYPES, only plain RDBMS tables.
Are you aware of a framework/product or tool to do what DBMS_XMLSTORE does but with any format of XML file ? If not, I am doomed.
Cheers.
Luc.
Edited by: user6693852 on Jan 13, 2009 7:02 AMIn case you decide to follow my advice, here's a simple example showing how to do this.. (Note the XMLTable syntax is the preferred approach in 10gr2 and later..
SQL> spool testase.log
SQL> --
SQL> connect / as sysdba
Connected.
SQL> --
SQL> set define on
SQL> set timing on
SQL> --
SQL> define USERNAME = XDBTEST
SQL> --
SQL> def PASSWORD = XDBTEST
SQL> --
SQL> def USER_TABLESPACE = USERS
SQL> --
SQL> def TEMP_TABLESPACE = TEMP
SQL> --
SQL> drop user &USERNAME cascade
2 /
old 1: drop user &USERNAME cascade
new 1: drop user XDBTEST cascade
User dropped.
Elapsed: 00:00:00.59
SQL> grant create any directory, drop any directory, connect, resource, alter session, create view to &USERNAME identified by &PASS
ORD
2 /
old 1: grant create any directory, drop any directory, connect, resource, alter session, create view to &USERNAME identified by &
ASSWORD
new 1: grant create any directory, drop any directory, connect, resource, alter session, create view to XDBTEST identified by XDB
EST
Grant succeeded.
Elapsed: 00:00:00.01
SQL> alter user &USERNAME default tablespace &USER_TABLESPACE temporary tablespace &TEMP_TABLESPACE
2 /
old 1: alter user &USERNAME default tablespace &USER_TABLESPACE temporary tablespace &TEMP_TABLESPACE
new 1: alter user XDBTEST default tablespace USERS temporary tablespace TEMP
User altered.
Elapsed: 00:00:00.00
SQL> connect &USERNAME/&PASSWORD
Connected.
SQL> --
SQL> var SCHEMAURL varchar2(256)
SQL> var XMLSCHEMA CLOB
SQL> --
SQL> set define off
SQL> --
SQL> begin
2 :SCHEMAURL := 'http://xmlns.example.com/askTom/TransactionList.xsd';
3 :XMLSCHEMA :=
4 '<?xml version="1.0" encoding="UTF-8"?>
5 <!--W3C Schema generated by XMLSpy v2008 rel. 2 sp2 (http://www.altova.com)-->
6 <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdb="http://xmlns.oracle.com/xdb" xdb:storeVarrayAsTable="true">
7 <xs:element name="TransactionList" type="transactionListType" xdb:defaultTable="LOCAL_TABLE"/>
8 <xs:complexType name="transactionListType" xdb:maintainDOM="false" xdb:SQLType="TRANSACTION_LIST_T">
9 <xs:sequence>
10 <xs:element name="Transaction" type="transactionType" maxOccurs="unbounded" xdb:SQLCollType="TRANSACTION_V"
>
11 </xs:sequence>
12 </xs:complexType>
13 <xs:complexType name="transactionType" xdb:maintainDOM="false" xdb:SQLType="TRANSACTION_T">
14 <xs:sequence>
15 <xs:element name="TradeVersion" type="xs:integer"/>
16 <xs:element name="TransactionId" type="xs:integer"/>
17 <xs:element name="Leg" type="legType" maxOccurs="unbounded" xdb:SQLCollType="LEG_V"/>
18 </xs:sequence>
19 <xs:attribute name="id" type="xs:integer" use="required"/>
20 </xs:complexType>
21 <xs:complexType name="paymentType" xdb:maintainDOM="false" xdb:SQLType="PAYMENT_T">
22 <xs:sequence>
23 <xs:element name="StartDate" type="xs:date"/>
24 <xs:element name="Value" type="xs:integer"/>
25 </xs:sequence>
26 <xs:attribute name="id" type="xs:integer" use="required"/>
27 </xs:complexType>
28 <xs:complexType name="legType" xdb:maintainDOM="false" xdb:SQLType="LEG_T">
29 <xs:sequence>
30 <xs:element name="LegNumber" type="xs:integer"/>
31 <xs:element name="Basis" type="xs:integer"/>
32 <xs:element name="FixedRate" type="xs:integer"/>
33 <xs:element name="Payment" type="paymentType" maxOccurs="unbounded" xdb:SQLCollType="PAYMENT_V"/>
34 </xs:sequence>
35 <xs:attribute name="id" type="xs:integer" use="required"/>
36 </xs:complexType>
37 </xs:schema>';
38 end;
39 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.00
SQL> set define on
SQL> --
SQL> declare
2 res boolean;
3 xmlSchema xmlType := xmlType(:XMLSCHEMA);
4 begin
5 dbms_xmlschema.registerSchema
6 (
7 schemaurl => :schemaURL,
8 schemadoc => xmlSchema,
9 local => TRUE,
10 genTypes => TRUE,
11 genBean => FALSE,
12 genTables => TRUE,
13 ENABLEHIERARCHY => DBMS_XMLSCHEMA.ENABLE_HIERARCHY_NONE
14 );
15 end;
16 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.26
SQL> desc LOCAL_TABLE
Name Null? Type
TABLE of SYS.XMLTYPE(XMLSchema "http://xmlns.example.com/askTom/TransactionList.xsd" Element "TransactionList") STORAGE Object-rela
ional TYPE "TRANSACTION_LIST_T"
SQL> --
SQL> create or replace VIEW TRAN_VIEW
2 as
3 select
4 extractvalue(x.column_value,'/Transaction/TradeVersion/text()') tradeversion,
5 extractvalue(x.column_value,'/Transaction//text()') transactionid
6 from
7 local_table,
8 table(xmlsequence(extract(OBJECT_VALUE,'/TransactionList/Transaction'))) x
9 /
View created.
Elapsed: 00:00:00.01
SQL> create or replace VIEW TRAN_LEG_VIEW
2 as
3 select
4 extractvalue(x.column_value,'/Transaction/TransactionId/text()') transactionid,
5 extractvalue(y.column_value,'/Leg/Basis/text()') leg_basis,
6 extractValue(y.column_value,'/Leg/FixedRate/text()') leg_fixedrate
7 from
8 local_table,
9 table(xmlsequence(extract(OBJECT_VALUE,'/TransactionList/Transaction'))) x,
10 table(xmlsequence(extract(x.column_value,'/Transaction/Leg'))) y
11 /
View created.
Elapsed: 00:00:00.01
SQL> create or replace VIEW TRAN_LEG_PAY_VIEW
2 as
3 select
4 extractvalue(x.column_value,'/Transaction/TransactionId/text()') transactionid,
5 extractvalue(y.column_value,'/Leg/LegNumber/text()') leg_legnumber,
6 extractvalue(z.column_value,'/Payment/StartDate/text()') pay_startdate,
7 extractValue(z.column_value,'/Payment/Value/text()') pay_value
8 from
9 local_table,
10 table(xmlsequence(extract(OBJECT_VALUE,'/TransactionList/Transaction'))) x,
11 table(xmlsequence(extract(x.column_value,'/Transaction/Leg'))) y,
12 table(xmlsequence(extract(y.column_value,'/Leg/Payment'))) z
13 /
View created.
Elapsed: 00:00:00.03
SQL> desc TRAN_VIEW
Name Null? Type
TRADEVERSION NUMBER(38)
TRANSACTIONID VARCHAR2(4000)
SQL> --
SQL> desc TRAN_LEG_VIEW
Name Null? Type
TRANSACTIONID NUMBER(38)
LEG_BASIS NUMBER(38)
LEG_FIXEDRATE NUMBER(38)
SQL> --
SQL> desc TRAN_LEG_PAY_VIEW
Name Null? Type
TRANSACTIONID NUMBER(38)
LEG_LEGNUMBER NUMBER(38)
PAY_STARTDATE DATE
PAY_VALUE NUMBER(38)
SQL> --
SQL> create or replace VIEW TRAN_VIEW_XMLTABLE
2 as
3 select t.*
4 from LOCAL_TABLE,
5 XMLTable
6 (
7 '/TransactionList/Transaction'
8 passing OBJECT_VALUE
9 columns
10 TRADE_VERSION NUMBER(4) path 'TradeVersion/text()',
11 TRANSACTION_ID NUMBER(4) path 'TransactionId/text()'
12 ) t
13 /
View created.
Elapsed: 00:00:00.01
SQL> create or replace VIEW TRAN_LEG_VIEW_XMLTABLE
2 as
3 select t.TRANSACTION_ID, L.*
4 from LOCAL_TABLE,
5 XMLTable
6 (
7 '/TransactionList/Transaction'
8 passing OBJECT_VALUE
9 columns
10 TRANSACTION_ID NUMBER(4) path 'TransactionId/text()',
11 LEG XMLType path 'Leg'
12 ) t,
13 XMLTABLE
14 (
15 '/Leg'
16 passing LEG
17 columns
18 LEG_NUMBER NUMBER(4) path 'LegNumber/text()',
19 LEG_BASIS NUMBER(4) path 'Basis/text()',
20 LEG_FIXED_RATE NUMBER(4) path 'FixedRate/text()'
21 ) l
22 /
View created.
Elapsed: 00:00:00.01
SQL> create or replace VIEW TRAN_LEG_PAY_VIEW_XMLTABLE
2 as
3 select TRANSACTION_ID, L.LEG_NUMBER, P.*
4 from LOCAL_TABLE,
5 XMLTable
6 (
7 '/TransactionList/Transaction'
8 passing OBJECT_VALUE
9 columns
10 TRANSACTION_ID NUMBER(4) path 'TransactionId/text()',
11 LEG XMLType path 'Leg'
12 ) t,
13 XMLTABLE
14 (
15 '/Leg'
16 passing LEG
17 columns
18 LEG_NUMBER NUMBER(4) path 'LegNumber/text()',
19 PAYMENT XMLType path 'Payment'
20 ) L,
21 XMLTABLE
22 (
23 '/Payment'
24 passing PAYMENT
25 columns
26 PAY_START_DATE DATE path 'StartDate/text()',
27 PAY_VALUE NUMBER(4) path 'Value/text()'
28 ) p
29 /
View created.
Elapsed: 00:00:00.03
SQL> desc TRAN_VIEW_XMLTABLE
Name Null? Type
TRADE_VERSION NUMBER(4)
TRANSACTION_ID NUMBER(4)
SQL> --
SQL> desc TRAN_LEG_VIEW_XMLTABLE
Name Null? Type
TRANSACTION_ID NUMBER(4)
LEG_NUMBER NUMBER(4)
LEG_BASIS NUMBER(4)
LEG_FIXED_RATE NUMBER(4)
SQL> --
SQL> desc TRAN_LEG_PAY_VIEW_XMLTABLE
Name Null? Type
TRANSACTION_ID NUMBER(4)
LEG_NUMBER NUMBER(4)
PAY_START_DATE DATE
PAY_VALUE NUMBER(4)
SQL> --
SQL> set long 10000 pages 100 lines 128
SQL> set timing on
SQL> set autotrace on explain
SQL> set heading on feedback on
SQL> --
SQL> VAR DOC1 CLOB
SQL> VAR DOC2 CLOB
SQL> --
SQL> begin
2 :DOC1 :=
3 '<TransactionList>
4 <Transaction id="1">
5 <TradeVersion>1</TradeVersion>
6 <TransactionId>1</TransactionId>
7 <Leg id="1">
8 <LegNumber>1</LegNumber>
9 <Basis>1</Basis>
10 <FixedRate>1</FixedRate>
11 <Payment id="1">
12 <StartDate>2000-01-01</StartDate>
13 <Value>1</Value>
14 </Payment>
15 <Payment id="2">
16 <StartDate>2000-01-02</StartDate>
17 <Value>2</Value>
18 </Payment>
19 </Leg>
20 <Leg id="2">
21 <LegNumber>2</LegNumber>
22 <Basis>2</Basis>
23 <FixedRate>2</FixedRate>
24 <Payment id="1">
25 <StartDate>2000-02-01</StartDate>
26 <Value>10</Value>
27 </Payment>
28 <Payment id="2">
29 <StartDate>2000-02-02</StartDate>
30 <Value>20</Value>
31 </Payment>
32 </Leg>
33 </Transaction>
34 <Transaction id="2">
35 <TradeVersion>2</TradeVersion>
36 <TransactionId>2</TransactionId>
37 <Leg id="1">
38 <LegNumber>21</LegNumber>
39 <Basis>21</Basis>
40 <FixedRate>21</FixedRate>
41 <Payment id="1">
42 <StartDate>2002-01-01</StartDate>
43 <Value>21</Value>
44 </Payment>
45 <Payment id="2">
46 <StartDate>2002-01-02</StartDate>
47 <Value>22</Value>
48 </Payment>
49 </Leg>
50 <Leg id="22">
51 <LegNumber>22</LegNumber>
52 <Basis>22</Basis>
53 <FixedRate>22</FixedRate>
54 <Payment id="21">
55 <StartDate>2002-02-01</StartDate>
56 <Value>210</Value>
57 </Payment>
58 <Payment id="22">
59 <StartDate>2002-02-02</StartDate>
60 <Value>220</Value>
61 </Payment>
62 </Leg>
63 </Transaction>
64 </TransactionList>';
65 :DOC2 :=
66 '<TransactionList>
67 <Transaction id="31">
68 <TradeVersion>31</TradeVersion>
69 <TransactionId>31</TransactionId>
70 <Leg id="31">
71 <LegNumber>31</LegNumber>
72 <Basis>31</Basis>
73 <FixedRate>31</FixedRate>
74 <Payment id="31">
75 <StartDate>3000-01-01</StartDate>
76 <Value>31</Value>
77 </Payment>
78 </Leg>
79 </Transaction>
80 </TransactionList>';
81 end;
82 /
PL/SQL procedure successfully completed.
Elapsed: 00:00:00.01
SQL> insert into LOCAL_TABLE values ( xmltype(:DOC1))
2 /
1 row created.
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 1
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | INSERT STATEMENT | | 1 | 100 | 1 (0)| 00:00:01 |
| 1 | LOAD TABLE CONVENTIONAL | LOCAL_TABLE | | | | |
SQL> insert into LOCAL_TABLE values ( xmltype(:DOC2))
2 /
1 row created.
Elapsed: 00:00:00.01
Execution Plan
Plan hash value: 1
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | INSERT STATEMENT | | 1 | 100 | 1 (0)| 00:00:01 |
| 1 | LOAD TABLE CONVENTIONAL | LOCAL_TABLE | | | | |
SQL> select * from TRAN_VIEW_XMLTABLE
2 /
TRADE_VERSION TRANSACTION_ID
1 1
2 2
31 31
3 rows selected.
Elapsed: 00:00:00.03
Execution Plan
Plan hash value: 650975545
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 3 | 168 | 3 (0)| 00:00:01 |
| 1 | NESTED LOOPS | | 3 | 168 | 3 (0)| 00:00:01 |
|* 2 | TABLE ACCESS FULL| SYS_NTGgl+TKyhQnWoFRSrCxeX9g== | 3 | 138 | 3 (0)| 00:00:01 |
|* 3 | INDEX UNIQUE SCAN| SYS_C0010174 | 1 | 10 | 0 (0)| 00:00:01 |
Predicate Information (identified by operation id):
2 - filter("SYS_NC_TYPEID$" IS NOT NULL)
3 - access("NESTED_TABLE_ID"="LOCAL_TABLE"."SYS_NC0000800009$")
Note
- dynamic sampling used for this statement
SQL> select * from TRAN_LEG_VIEW_XMLTABLE
2 /
TRANSACTION_ID LEG_NUMBER LEG_BASIS LEG_FIXED_RATE
1 1 1 1
1 2 2 2
2 21 21 21
2 22 22 22
31 31 31 31
5 rows selected.
Elapsed: 00:00:00.04
Execution Plan
Plan hash value: 1273661583
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 5 | 560 | 7 (15)| 00:00:01 |
|* 1 | HASH JOIN | | 5 | 560 | 7 (15)| 00:00:01 |
| 2 | NESTED LOOPS | | 3 | 159 | 3 (0)| 00:00:01 |
|* 3 | TABLE ACCESS FULL| SYS_NTGgl+TKyhQnWoFRSrCxeX9g== | 3 | 129 | 3 (0)| 00:00:01 |
|* 4 | INDEX UNIQUE SCAN| SYS_C0010174 | 1 | 10 | 0 (0)| 00:00:01 |
|* 5 | TABLE ACCESS FULL | SYS_NTUmyermF/S721C/2UXo40Uw== | 5 | 295 | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - access("SYS_ALIAS_1"."NESTED_TABLE_ID"="SYS_ALIAS_0"."SYS_NC0000800009$")
3 - filter("SYS_NC_TYPEID$" IS NOT NULL)
4 - access("NESTED_TABLE_ID"="LOCAL_TABLE"."SYS_NC0000800009$")
5 - filter("SYS_NC_TYPEID$" IS NOT NULL)
Note
- dynamic sampling used for this statement
SQL> select * from TRAN_LEG_PAY_VIEW_XMLTABLE
2 /
TRANSACTION_ID LEG_NUMBER PAY_START PAY_VALUE
1 1 01-JAN-00 1
1 1 02-JAN-00 2
1 2 01-FEB-00 10
1 2 02-FEB-00 20
2 21 01-JAN-02 21
2 21 02-JAN-02 22
2 22 01-FEB-02 210
2 22 02-FEB-02 220
31 31 01-JAN-00 31
9 rows selected.
Elapsed: 00:00:00.07
Execution Plan
Plan hash value: 4004907785
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
| 0 | SELECT STATEMENT | | 9 | 1242 | 10 (10)| 00:00:01 |
|* 1 | HASH JOIN | | 9 | 1242 | 10 (10)| 00:00:01 |
|* 2 | HASH JOIN | | 5 | 480 | 7 (15)| 00:00:01 |
| 3 | NESTED LOOPS | | 3 | 159 | 3 (0)| 00:00:01 |
|* 4 | TABLE ACCESS FULL| SYS_NTGgl+TKyhQnWoFRSrCxeX9g== | 3 | 129 | 3 (0)| 00:00:01 |
|* 5 | INDEX UNIQUE SCAN| SYS_C0010174 | 1 | 10 | 0 (0)| 00:00:01 |
|* 6 | TABLE ACCESS FULL | SYS_NTUmyermF/S721C/2UXo40Uw== | 5 | 215 | 3 (0)| 00:00:01 |
|* 7 | TABLE ACCESS FULL | SYS_NTelW4ZRtKS+WKqCaXhsHnNQ== | 9 | 378 | 3 (0)| 00:00:01 |
Predicate Information (identified by operation id):
1 - access("NESTED_TABLE_ID"="SYS_ALIAS_1"."SYS_NC0000900010$")
2 - access("SYS_ALIAS_1"."NESTED_TABLE_ID"="SYS_ALIAS_0"."SYS_NC0000800009$")
4 - filter("SYS_NC_TYPEID$" IS NOT NULL)
5 - access("NESTED_TABLE_ID"="LOCAL_TABLE"."SYS_NC0000800009$")
6 - filter("SYS_NC_TYPEID$" IS NOT NULL)
7 - filter("SYS_NC_TYPEID$" IS NOT NULL)
Note
- dynamic sampling used for this statement
SQL>Out of interest why are you so against using XMLType...
Edited by: mdrake on Jan 13, 2009 8:25 AM -
Error engineering logical data model to relational data model -- name column hierarchies
Hello,
I have three entities, Entity1 is logical only , entity2 is a subtype of entity1, and entity3 is a subtype of entity1.
Entity1 has the abbreviation ( PRUE) and entity1 has three atributes ( PRUE_PPPPPP, PRUE_OOOOO).
when I make engineering the columns resulting in entity2 and entity3 are PRUE_PRUE_PPPPPP and PRUE_PRUE_OOOOO
I have unchecked the options apply translations of names and preferred use abbreviations in general options (engineering)
and the tree comparison is the right name (While the result in the relational model is incorrect)
¿Any help?Hello,
version 4.0.0.820.
I checked the options (naming standard template) and they are correct, the problem is in the engineering.
Thanks -
Help with relational database model
Hi everyone,
How will a database model look like if you have one program that writes to the database and one program that reads from it. The database tables consist of customer orders.
Regards
ArdalanDatabase model itself is unchanged, as far as I can see. The tables don't know how they're being used.
If you're saying that you have two apps, one that does mostly reads and another that does reads AND writes, then it's a more interesting question.
If you have a table that's mostly READs, you might want to create indexes that speed up queries.
But indexes can slow down WRITEs, because every time you add a new record the index has to be modified, too. More work for the RDBMS.
So maybe you're asking whether or not you should create a bunch of indexes for a table? Or have two tables, one for reading and another for read/write, with some kind of procedure that might update the read table from the write values on a regular schedule but off-line, like synchronizing a data cube?
Hard to tell from your OP, but it could be an interesting question. - MOD -
how can i import tables from a different schema into the existing relational model... to add these tables in the existing relational/logical model? plss help
note; I already have the relational/logical model ready from one schema... and I need to add few more tables to this relational/logical model
can I import the same way as I did previously??
but even if I do the same how can I add it in the model?? as the logical model has already been engineered..
please help ...
thanksHi,
Before you start, you should probably take a backup copy of your design (the .dmd file and associated folder), in case the update does not work out as you had hoped.
You need to use Import > Data Dictionary again, to start the Data Dictionary Import Wizard.
In step 1 use a suitable database connection that can access the relevant table definitions.
In step 2 select the schema (or schemas) to import. The "Import to" field in the lower left part of the main panel allows you to select which existing Relational Model to import into (or to specify that a new Relational Model is to be created).
In step 3 select the tables to import. (Note that if there are an Foreign Key constraints between the new tables and any tables you had previously imported, you should also include the previous tables, otherwise the Foreign Key constraints will not be imported.)
After the import itself has completed, the "Compare Models" dialog is displayed. This shows the differences between the model being imported and the previous state of the model, and allows you to select which changes are to be applied.
Just selecting the Merge button should apply all the additions and changes in the new import.
Having updated your Relational Model, you can then update your Logical Model. To do this you repeat the "Engineer to Logical Model". This displays the "Engineer to Logical Model" dialog, which shows the changes which will be applied to the Logical Model, and allows you to select which changes are to be applied.
Just selecting the Engineer button should apply all the additions and changes.
I hope this helps you achieve what you want.
David -
Working with Object Relational model and Eclipse
Hello,
I have mad some types and typed tables in a schema on oracle 10g.
My database respects the Object Relational model, in which I work with VARRAY, TYPES, NESTED TABLES, PL/SQL,...
I have already install Enterprise Pack for Eclipse, and also have the Weblogic server, And I can generate tables. But the problem is that it gives to me this tables with wrong types, until they contains in fact other tables as Objet column, and also the types are not supported.
Please need a help !
Thank's in advance :)nhauge wrote:
Hi,
I want to make sure I understand the problem but will try to give you some information as well. So you have an Oracle 10g database in which you are using the object-relational database model with VARRAY's, etc. You say you are also trying to generate tables, but the generation is not working correctly. Are you using the "Generate tables from entities..." functionality? What is the source of the generated tables? I assume you generating from some type of JPA entity? Could you give a small example of the source you are generating from?
In order to generate proper tables of this type, you would need to be using special TopLink/EclipseLink annotations such as @Array so the persistence provider would know that they are "special" and not just regular entities that would create standard relational tables.
Neil
Thank you for your replay,
well I'm generating that with "Generate tables from entities" of eclipse link.
this is an example of what I have in the database:
[DB-SCRIPT|http://www.mediafire.com/view/?n3knwz1o4ggk50n]
and this is what is generated(eclipselink-orm.xml):
<?xml version="1.0" encoding="UTF-8"?>
<entity-mappings version="1.2" xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/orm" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.eclipse.org/eclipselink/xsds/persistence/orm http://www.eclipse.org/eclipselink/xsds/eclipselink_orm_1_2.xsd">
<entity class="model.Chefterritoire" access="VIRTUAL">
<attributes>
<id name="idChef" attribute-type="long">
<column name="ID_CHEF"/>
</id>
<basic name="lesterritoires" attribute-type="Object">
</basic>
<basic name="nomChef" attribute-type="String">
<column name="NOM_CHEF"/>
</basic>
<basic name="tel" attribute-type="java.math.BigDecimal">
</basic>
</attributes>
</entity>
<entity class="model.Client" access="VIRTUAL">
<attributes>
<id name="idClient" attribute-type="long">
<column name="ID_CLIENT"/>
</id>
<basic name="adresseClient" attribute-type="String">
<column name="ADRESSE_CLIENT"/>
</basic>
<basic name="dateP" attribute-type="java.util.Date">
<column name="DATE_P"/>
<temporal>DATE</temporal>
</basic>
<basic name="lescommandes" attribute-type="Object">
</basic>
<basic name="nomClient" attribute-type="String">
<column name="NOM_CLIENT"/>
</basic>
<basic name="profession" attribute-type="String">
</basic>
<basic name="refrepresentant" attribute-type="Object">
</basic>
<basic name="telClient" attribute-type="java.math.BigDecimal">
<column name="TEL_CLIENT"/>
</basic>
</attributes>
</entity>
<entity class="model.Commande" access="VIRTUAL">
<attributes>
<id name="idCommande" attribute-type="long">
<column name="ID_COMMANDE"/>
</id>
<basic name="dateCommande" attribute-type="java.util.Date">
<column name="DATE_COMMANDE"/>
<temporal>DATE</temporal>
</basic>
<basic name="dateLivraison" attribute-type="java.util.Date">
<column name="DATE_LIVRAISON"/>
<temporal>DATE</temporal>
</basic>
<basic name="refreleve" attribute-type="Object">
</basic>
<basic name="refrepresentant" attribute-type="Object">
</basic>
<basic name="refvehicule" attribute-type="Object">
</basic>
<basic name="reprise" attribute-type="String">
</basic>
</attributes>
</entity>
<entity class="model.Constructeur" access="VIRTUAL">
<attributes>
<id name="idConstructeur" attribute-type="long">
<column name="ID_CONSTRUCTEUR"/>
</id>
<basic name="adresseConstructeur" attribute-type="String">
<column name="ADRESSE_CONSTRUCTEUR"/>
</basic>
<basic name="lesreleves" attribute-type="Object">
</basic>
<basic name="nomConstructeur" attribute-type="String">
<column name="NOM_CONSTRUCTEUR"/>
</basic>
<basic name="refvehucule" attribute-type="Object">
</basic>
</attributes>
</entity>
<entity class="model.LesccommandesN" access="VIRTUAL">
<table name="LESCCOMMANDES_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LescommandessN" access="VIRTUAL">
<table name="LESCOMMANDESS_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LescommandesN" access="VIRTUAL">
<table name="LESCOMMANDES_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LesoptionsN" access="VIRTUAL">
<table name="LESOPTIONS_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LesrepresentantsN" access="VIRTUAL">
<table name="LESREPRESENTANTS_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LessclientsN" access="VIRTUAL">
<table name="LESSCLIENTS_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LesscommandesN" access="VIRTUAL">
<table name="LESSCOMMANDES_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LesterritoiresN" access="VIRTUAL">
<table name="LESTERRITOIRES_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.LesvehiculesN" access="VIRTUAL">
<table name="LESVEHICULES_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.Modele" access="VIRTUAL">
<attributes>
<id name="idModele" attribute-type="long">
<column name="ID_MODELE"/>
</id>
<basic name="couleurExterieure" attribute-type="String">
<column name="COULEUR_EXTERIEURE"/>
</basic>
<basic name="couleurInterieure" attribute-type="String">
<column name="COULEUR_INTERIEURE"/>
</basic>
<basic name="lesoptions" attribute-type="Object">
</basic>
<basic name="lesvehicules" attribute-type="Object">
</basic>
<basic name="prix" attribute-type="double">
</basic>
</attributes>
</entity>
<entity class="model.Option" access="VIRTUAL">
<table name="OPTIONS"/>
<attributes>
<id name="idOption" attribute-type="long">
<column name="ID_OPTION"/>
</id>
<basic name="nomOption" attribute-type="String">
<column name="NOM_OPTION"/>
</basic>
<basic name="refmodele" attribute-type="Object">
</basic>
</attributes>
</entity>
<entity class="model.Rapportvisite" access="VIRTUAL">
<attributes>
<id name="idRapport" attribute-type="long">
<column name="ID_RAPPORT"/>
</id>
<basic name="dateVisite" attribute-type="java.util.Date">
<column name="DATE_VISITE"/>
<temporal>DATE</temporal>
</basic>
<basic name="frais" attribute-type="double">
</basic>
<basic name="refclient" attribute-type="Object">
</basic>
<basic name="refrepresentant" attribute-type="Object">
</basic>
<basic name="resultat" attribute-type="String">
</basic>
</attributes>
</entity>
<entity class="model.Releve" access="VIRTUAL">
<attributes>
<id name="idReleve" attribute-type="long">
<column name="ID_RELEVE"/>
</id>
<basic name="dateDebut" attribute-type="java.util.Date">
<column name="DATE_DEBUT"/>
<temporal>DATE</temporal>
</basic>
<basic name="dateFin" attribute-type="java.util.Date">
<column name="DATE_FIN"/>
<temporal>DATE</temporal>
</basic>
<basic name="lescommandes" attribute-type="Object">
</basic>
<basic name="refconst" attribute-type="Object">
</basic>
</attributes>
</entity>
<entity class="model.RelevesN" access="VIRTUAL">
<table name="RELEVES_N"/>
<attributes>
</attributes>
</entity>
<entity class="model.Remise" access="VIRTUAL">
<attributes>
<id name="idRemise" attribute-type="long">
<column name="ID_REMISE"/>
</id>
<basic name="remise" attribute-type="double">
</basic>
</attributes>
</entity>
<entity class="model.Representant" access="VIRTUAL">
<attributes>
<id name="idRepresentant" attribute-type="long">
<column name="ID_REPRESENTANT"/>
</id>
<basic name="lesclients" attribute-type="Object">
</basic>
<basic name="lescommandes" attribute-type="Object">
</basic>
<basic name="nomRepresentant" attribute-type="String">
<column name="NOM_REPRESENTANT"/>
</basic>
<basic name="refterritoire" attribute-type="Object">
</basic>
<basic name="typeRep" attribute-type="String">
<column name="TYPE_REP"/>
</basic>
</attributes>
</entity>
<entity class="model.Territoire" access="VIRTUAL">
<attributes>
<id name="idTerritoire" attribute-type="long">
<column name="ID_TERRITOIRE"/>
</id>
<basic name="lesrepresentants" attribute-type="Object">
</basic>
<basic name="nomTerritoire" attribute-type="String">
<column name="NOM_TERRITOIRE"/>
</basic>
<basic name="refchef" attribute-type="Object">
</basic>
</attributes>
</entity>
<entity class="model.Vehicule" access="VIRTUAL">
<attributes>
<id name="idVehicule" attribute-type="long">
<column name="ID_VEHICULE"/>
</id>
<basic name="lescommandes" attribute-type="Object">
</basic>
<basic name="nomVehicule" attribute-type="String">
<column name="NOM_VEHICULE"/>
</basic>
<basic name="refavoir" attribute-type="Object">
</basic>
<basic name="refmodele" attribute-type="Object">
</basic>
</attributes>
</entity>
<entity class="model.Visiteav" access="VIRTUAL">
<attributes>
<id name="idVisiteav" attribute-type="long">
<column name="ID_VISITEAV"/>
</id>
<basic name="dateDebut" attribute-type="java.util.Date">
<column name="DATE_DEBUT"/>
<temporal>DATE</temporal>
</basic>
<basic name="dateFin" attribute-type="java.util.Date">
<column name="DATE_FIN"/>
<temporal>DATE</temporal>
</basic>
<basic name="refclient" attribute-type="Object">
</basic>
<basic name="refrepresentant" attribute-type="Object">
</basic>
</attributes>
</entity>
</entity-mappings> -
Basic questions on data modeling
Hi experts,
I have some basic questions regarding data modeling within MDM. I understand the available table types and the concept of lookup fields. I know that the MDM data modeling concept is different to the relational concept. But having a strong database background my first step was to design a relational data model which I would like to transfer to a MDM repository. Unfortunately I didn't found good information material on this. So here are some questions maybe you can help me:
1) Is it the right approach to model n:m relationships with multivalued lookup fields? E.g. main table Users with lookup field from subtable SapAccounts (a user can have accounts in different SAP systems, that means more than one account).
2) Has a record always be unique in MDM repositories (e.g. should we use Auto ID's in every table or do we have to mark a combination of fields as unique)? Is a composite key of 2 or more fields represented with marking these fields as unique?
3) The concept of relationships in MDM is only based on relationships between single records (not valid for all records in a table)? Is it necessary to define all relationships similar to the relational data model in MDM? Is there something similar to referential integrity in MDM?
4) Is it possible to change the main table to a sub table later on if we realize that it has also to be used as a lookup table for another table (when extending the data model) or do we have to create a new repository from scratch?
Thank you for your answers.
Regards, bdYes you are correct. It is almost difficult to map relational database to mdm one. But again MDM is not 'just' a database. It holds much more 'master' information as compared to any relational db.
1) Is it the right approach to model n:m relationships with multivalued lookup fields? E.g. main table Users with lookup field from subtable SapAccounts (a user can have accounts in different SAP systems, that means more than one account).
Yes Here you need to use MV look up tables or can also try Qualifier tables if it gets more complex
2) Has a record always be unique in MDM repositories (e.g. should we use Auto ID's in every table or do we have to mark a combination of fields as unique)? Is a composite key of 2 or more fields represented with marking these fields as unique?
Concept of uniqueness differs here that you also have something called Display Fields (DF). A combination of DF can also be treated as Unique one. For instance while importing records if you select these DF as a combination, you will eliminate any possible of duplicates based on this combination. Auto Id is one of the ways to have a unique id once record is within MDM. While you use UF or DF to eliminate any possible duplicates at import level
3) The concept of relationships in MDM is only based on relationships between single records (not valid for all records in a table)? Is it necessary to define all relationships similar to the relational data model in MDM? Is there something similar to referential integrity in MDM?
Hmm... good one. Referencial Integrity. What I assume you are talking is that if you have relationships between tables then removing a record will not be possible as it is a foreign key for some record. Here MDM does not allow that. As Relationships within MDM are physical and not conceptual. For instance material can have components. Now if material does not exist then any relationship to components is not worthwile to maintain. Hence relationshsip is eliminated. While in relational model relationships are more conceptual. Hence with MDM usage of lookups and main table you do not need to maintain these kind of relationships on your own.
4) Is it possible to change the main table to a sub table later on if we realize that it has also to be used as a lookup table for another table (when extending the data model) or do we have to create a new repository from scratch?
No. It is not possible to convert main table. There is only one main table and it cannot be changed.
I went for the same option but it did not work. What I suggest is to look up your legacy system one by one and see what fields in general can be classified as Master, Reference, Transactional - You will start getting answers immediately. -
MVC model in Web systems and applications
MVC model in Web systems and applications
Object-oriented design model is experience, MVC idea is a user interface for the original. This article discusses how the major application areas in the new Web design patterns and the use of MVC framework. The article first introduced the concept of design patterns and characteristics, and MVC architecture design concepts and analysis of the MVC framework contains several key models. Based on the characteristics of Web applications on how to use patterns and MVC framework made some design ideas.??
1. Introduction
1.1 design model
Object-oriented technology and the emergence of software applications has greatly enhanced the trusted and software quality. Object-oriented programming than previous models to various programming simple and efficient, but the object-oriented design methodology than the previous design methods to complex and much more skill, a good design should be both on the issue of gender, but also to take full account of the problems and needs sufficient interoperability. In the past 10 years, people in the object-oriented technology and the practical application of research to explore certain issues in relation to the creation of a number of good solutions, the so-called object-oriented design patterns. Object-oriented technology is one of the purposes of enhancing the software trusted, and to design model, design programmes in important positions from a deeper sense of meaning and essence embodies trusted. There are many people in the design model definition, which cited Christopher Alexander is the largest design model definition : Each design model is a tripartite rule, which expresses a contextual environment (Context), a problem and a solution. Design models generally following basic elements : model name, the purpose solution effect 1995-1998 code and related design models. There are several classifications design patterns can be divided into a model based on the purpose (Creational), structural type (Structural) and the type of behaviour (Behavioral) three. It is mainly used in the creation of a model-based object model-based structure to deal primarily with the category or combination of objects, used to describe behavior-based model is the main target for the category or how stress and how to allocate responsibilities. Design patterns can be divided into categories based on the scope and target mode model type model dealing with the relationship between the categories and sub-categories, these relations through the establishment of succession in Translation moment to be finalized, are static. Model is targeted at addressing the relationship between the moment of change these relations in the operation, more dynamic. Model features : through the experience acquired in a structured format to write down, avoid encountering the same problems on the first design, exist in different abstract level, in continuous improvement, can be trusted artificial product for the design and best practice in the world to be combined to address larger issues.
1.2 MVC framework
MVC was first used in a user interface Smalltalk-80 China. M representative models Model, representatives maps View V, C representatives controller Controller. MVC trusted code with the aim of increasing the rate of data reduction expressed, the data describing the operation and application coupled degrees. Also makes software Keweihuxing, restorative, expansionary, flexibility and packaging of greatly enhanced. Single-user applications are usually incident-driven user interface to the organizational structure. Staff development tool with an interface painting of a user interface interface code based on user input and then prepare to implement the corresponding moves, many interactive development environment encouraged to do so, because it emphasizes first and then a functional interface. Some software design model is the strategy that will be fixed before the code into the regular system of the final. Result is that the procedures and organizations around the user interface elements in the user interface elements of those moves, data storage, applications and functions of the code is used to indicate the way intertwined. In single-user system code structure can be so, because the system will not demand frequent changes. But for a large system such as large Web systems, or e-commerce systems to be applied. Model by incorporating data from a variety of access and control data can be separated to improve distributed system design. MVC design pattern is composed of three parts. Model is the application object, no user interface. Type in the screen showing that it represents the flow of data users. Controller user interface definition response to user input, the users responsible for the action against the Model into operation. Model View data updated to reflect the adoption of data changes.
2. MVC design pattern,
An MVC framework for the design of the system includes many models, but with MVC is most closely related to the following three models : Observer, Cambridge and Strategy.
2.1 Observer models
MVC through the use of purchase / notification form and the separation of the Model View. View to ensure that their content accurately reflected Model and state. Once Model content changes, there must be a mechanism to allow notification to the relevant Model View, View can be made relevant at the appropriate time updating of data. This design is also more general problems can be solved, the target separation, making a change to the target audience affect others, which targets those who do not know the details of the object being affected. This is described as Observer in the design model. Model type : Observer model is the object-oriented model, it is behaviour-based model. Model purposes : definition of hierarchical dependence relations between objects, or when a target value of the state change, all its dependent relationship with the object are notified and automatically updated. There are a variety of data may show a way, in different ways and may also show. When a way through a changed data, then the other should be able to show immediately that the data change and do accordingly.
Effect :
1. Abstract coupling. I only know that it has a target audience of some observers, the observers met each abstract Observer category simple interface, does not know their specific affiliation categories. This makes the coupling between goals and observers smallest and abstract.
2. Support radio communications. Needless to notify designated observers goals, how to deal with the observer informed decisions.
3. Possible accidents updated. We update logic, avoiding mistakes updated.
2.2 Faculty model
MVC is an important feature of View can nest. Nest can be used for any type of combination of local maps available, but also management of type nest. This thinking reflects the type and mix of components will be equal treatment design. This object-oriented design ideas in the area of Cambridge has been described as a design model. Model types : Cambridge model is the object-oriented model, it is also the structure type model. Model purpose : to target portfolio into tree structures to express "part-whole" level structure. Prepared for the use and combination of individual target audiences with the use of consistency.
Effect :
1. Definition of a target portfolio includes simple objects and the structure of the category level. Simple objects may be complex combinations of objects, and can be targeted portfolio mix. This customer-code used in the target areas can use simple combinations target.
2. Simplify customer-code. Needless to know their customers - a mix of target audiences is a simple target or can use these items in a consistent manner.
3. Easier to add new types of components. New components can easily be changed to a combination of customer-targeted codes.
2.3 Strategy model
Another important characteristic is the MVC can not change the View of changes View response to user input. This often requires a change in response to the logic of the system is very important. MVC to respond to the logic involved in the Controller. Controller of a category level structure could easily change to the original Controller appropriate, a new Controller. View Controller son used to achieve a specific example of such a response strategy. To achieve different response strategy, as long as examples of the use of different types of replacement will Controller. Also in the running time by changing the View Controller for users to change View of response strategies. This View-Controller relationship was described as an example of Strategy design pattern. Model types : Strategy model is the object-oriented model, it is behaviour-based model. Model purposes : definition of a series of algorithms, and their packaging, and ensure that they can replace each other, making algorithms can independently use its customer-change.
Effect :
1. Strategy category levels for Context definition of the relevant algorithms can be trusted or behaviour.
2. Alternative methods of succession. If the direct successor Context, with different acts will be added Context act, the realization of which would algorithm mixed up with Context, Context hard to preserve and expand, but can not dynamically changing algorithms. Will be enclosed in a separate Strategy category algorithms to enable algorithm independent Context change easily cut over expansion.
3. Can provide the same acts different date.
4. Strategy-must understand what customers between different.
5. Context and Strategy communications between costs.
6. An increase in the number of targets.
3. MVC in Web application system
Now some of the distributed systems such as Web-based B2B e-commerce system, suitable for use MVC framework. Through analysis from the perspective of high-level applications can be a target divided into three categories. Category is shown for the target audience consists of a group of commercial rules and data, there is a category that is receiving requests to control commercial target to complete the request. These applications often need to change is shown, such as web style, color, but also need to demonstrate the contents of the display. And the business rules and data to be relatively stable. Therefore, said that the frequent need to change the View objects that the business rules and data model to be relatively stable target, and that the control of the Controller is the most stable. When the system is usually issued after the View objects by artists, designers or HTML/JSP system managers to manage. Controller target applications development personnel from the development and implementation of rules for commercial and business development personnel from the target data, database managers and experts in the field of common completed. Show in Web?? or customers - control logic can be Servlet or JSP, dynamically generated Html. Generally used Servlet better than using JSP. JSP will be better with the Html code of separate codes for page designers and developers of separation efficiency. Servlet and JSP can complete all complete functions, actually JSP eventually converted into a Servlet. And control of the target system exists in every level, the coordination of cross-layer moves. Contain business rules and data objects exist in the EJB layer (EJB-centred model) or Web?? (Web-centred model).
3.1 View in the Web application system
View of the system shows that it fully exist in Web??. General by JSP, Java Bean and Custom Tag. JSP can generate dynamic web content using Java Custom Tag easier Bean, but it can show the logic of packaging, and more conducive to modular trusted. Some well-designed in a number of JSP Custom Tag can even be used in different system duplication. Model for control of JSP and Java Bean objects. JSP through Java Bean objects to retrieve the data model, the Model and Controller object is responsible for updating the data on Java Bean. In general, can we devise all possible screen that users can see all the elements of the system. Based on these elements, to identify the public part of passive components and dynamics. Can consider the use of templates means to separate the content generated JSP public, also need to change their generation Html or JSP from a JSP templates to dynamically introduce these different parts (include methods). Another issue to consider is screen option, when dealing with End users request template automatically available to show that the concern that users must know what is the screen components. So can consider all screens on the definition of a centralized document, such as a document or text document java. Taking into account the possibility of changes in future document definition screens, the best use of text documents such as a XML document, so future changes to the recompilation. According to the URL and user input parameters to shine upon the results of a screen, of course, likely to be made on the basis of the outcome of the implementation of actions to choose different results screen. Therefore, the need for a request for matching resources with document (XML), if a URL request several different results, it must specify in the document need to control the flow (a controller object), as well as the corresponding screen different flows.
3.2 Model in the Web application system
Model objects represent business rules and business data exist in EJB layer and Web??. In J2EE norms, the system needs some data stored in the database, such as user account information (account model), the company's data (company model), some not recorded in the database. If a user browsing the current catalogue (catalog model), the contents of his shopping (shopping cart model). Which one of these models exist in the data according to their life cycle and scope to decide. In Web?? a HttpSession and ServletContext and Java Bean objects to store data in the EJB layer is a data storage and logic EJB to. Web?? the Java Bean objects stored in the model layer model of the EJB object data copy. Because there are many different EJB tier model targets, so Web?? through a ModelManager to control the EJB layer object model in ModelManger background model can be used for packaging methods. In the EJB layer and the rules have all the data into EJB model is inappropriate. If the database can visit the Dao object model into objects. Dao can be encapsulated and the specific details of the database in the world, if we can write a different table, a number of databases, or even multiple databases. If the orders can be a model for OrderDAO, it may have to deal with Order table, table and OrderItemLines OrderStatus table. Value can also consider the use of targets. Value can be a target of securing long-range targets, because every time the remote object attributes could be a long-range redeployment process will consume network resources. EJB objects in the distance can be used instead target. In the distance, one-time items to be targeted instead of the value of all attributes.
3.3 Controller in Web application system
Coordination with the Model View Controller object to the request of users into the system to identify incidents. In Web?? generally a MainServlet (or Main.jsp), and receiving all requests, it can use screen flow management devices (ScreenFlowManger) decided next screen. There is a general request processors RequestProcessor contains all requests are needed to be done to deal with logic, such as the request translated into system events (RequestToEvent). Acting processors usually also includes a request for ClientControlWebImpl, it is logical to deal with the EJB layer in Web?? Acting. In EJB layer, a layer for EJB tier Web ClientController provide the CD visit. Another StateMachine used to create and delete ejb handle Web?? sent to the incident. Controller Another important function is synchronous View and Model data. ModelManger contained in a ModelUpdateManger, it puts events into a Model System assembly that all the needs of synchronous Model, and then notify Listeners do synchronous operation.
4. Concluding remarks
In recent years, with the Internet technology development and the emergence of new business models, the Web is based on a large number of applications. On how to design these systems architecture, and gradually there has been some convergence of opinion, the most important point is that its structure should be rational in the open. Demand than ever faster development of technology and design concepts, systems for the future, the cost of upgrading the smallest, research software systems architecture still very useful and necessary.Bravo. And your point is?
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Front end Backend Modeling Configuration Reporting and Extraction.
Hi..All
Can Any one plz explain the terms "Front end","Back end" related to Modeling,Configuration,Reporting and Extraction.
Thanks & Regards
Jonn
<u>[email protected]</u>Hi,
Frontend is the reporting aspect, i.e Workbooks, queries, Web reporting, Crystal reports, etc.
Its called the frontend as that's what the users see and they don't see what goes on in the 'backend' i.e Config and Extraction, data manipulations, etc.
Modeling is used to design the cube, ODS, etc. Also modeling concepts can be used to design frontend queries as well.
Cheers,
Kedar -
Problems with printing from SQL Developer Data Modeler 2.0
Hi,
I am not able to print my Relational Model (SubView) from Data Modeler 2.0 Build 584. Only an empty page comes out. If I don't reduce the Print Scale (usually to 10-30%) I get something but then it is lots of pages. I have tried A4 and A3 format. Printing to JPEG or PDF seems to be ok.
I have relational data model with 25 tables in my SubView.
Is there any restriction on Print Scale or number of objects in the diagram?
Do I have to install SQL Developer as well? I have just Data Modeler insalled.
Regards,
AlexHi Alex,
There is newer version of Data Modeler (3.0 EA2) and it is free
You can download it from here
http://www.oracle.com/technetwork/developer-tools/datamodeler/ea2-downloads-185792.html
Regards
Edited by: Dimitar Slavov on Dec 9, 2010 2:15 AM
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