Implementing constraints in sql

Hi,
I have posted this message before but not got any +ve reply can some one please help me.......
I am facing a small problem i am doing a database for a supermarket i am encountering a small problem in the following area:
I have two tables:
1) orders :orderno,date
2) products:productno,price
3) new table:orderno,productno,quantity_ordered
an order can have any one number of products(should have atleast one) and a product can be any number of orders(no orders also).Now since this is a many to many on both sides im trying to resolve it by making a new table(new table)
how do i make sure that an order has atleast product ie that an orderno in order table should also be present in the new table that im creating .Can any one suggest a solution for this wether to use a trigger or check or what
please help as im stuck at this point

Hi,
I have posted this message before but not got any +ve reply can some one please help meThis is not because you create too many thread on the same wubject that you will have more chance to have any help.
problem in implementing constraint
implementing constraints in sql
If you need absolutely a response, create an iTAR on Oracle support... here there are only volonteers.
You can read http://www.catb.org/~esr/faqs/smart-questions.html
Nicolas.

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Hi All,
Is there anyway to implement the custom sql query in CR for joining the two tables?
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Thanks,
Gana

In the Database Expert, expand the Create New Connection folder and browse the subfolders to locate your data source.
Log on to your data source if necessary.
Under your data source, double-click the Add Command node.
In the Add Command to Report dialog box, enter an appropriate query/command for the data source you have opened.
For example:
SELECT
    Customer.`Customer ID`,
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    Customer.`Region`,
    Customer.`Country`,
    Orders.`Order Amount`,
    Orders.`Customer ID`,
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FROM
    Customer Customer INNER JOIN Orders Orders ON
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WHERE
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Optionally, you can create a parameter for your command by clicking Create and entering information in the Command Parameter dialog box.
For more information about creating parameters, see To create a parameter for a command object.
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Loader constraints (oracle/sql/converter/CharacterConverters)

I'm trying to get OC4J standalone to work with instant client of JDBC in order to use OCI. I can run the java code stand-alone on the Oracle home I've installed the OC4J in, but when I try to run the application through OC4J I get the following error - indicating a setup problem?
java.lang.LinkageError: Class oracle/sql/converter/CharacterConverters violates loader constraints
     at java.lang.ClassLoader.defineClass0(Native Method)
     at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
     at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
     at com.evermind[Oracle Application Server Containers for J2EE 10g (10.1.2.0.2)].util.OC4JSecureClassLoader.defineClassEntry(OC4JSecureClassLoader.java:172)
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     at oracle.sql.CharacterSet1Byte.getInstance(CharacterSet1Byte.java:79)
     at oracle.sql.CharacterSetWithConverter.getInstance(CharacterSetWithConverter.java:91)
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     at oracle.jdbc.driver.DBConversion.<init>(DBConversion.java:126)
     at oracle.jdbc.driver.T2CConnection.logon(T2CConnection.java:356)
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     at oracle.jdbc.pool.OracleDataSource.getConnection(OracleDataSource.java:146)
     at tsa.common.tsaDB.newConnection(tsaDB.java:30)
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Well - I don't have to look for that setting - I know it's set to excatly that - because I did that ;)
I cannot use the JDBC built into OC4J. First, it's using CLASSES12DMS - secondly I use XDB. Even if it was using OJDBC14 it most likely would not be "binary compatible" with the XDB from the 10g RDBMS. I've had this problem on the AS 10g of OC4J and I did try it on this one too. XDB crashes out with basically the same error -just different library.
My issue is integration into OC4J. This application works outside OC4J (the method that fails work). By simply setting CLASSPATH to the OJDBC14 from the instant client, LD_LIBRARY_PATH to the *.so files from the same instant client, plus XDB from the 10g home, and XMLPARSEV2 - the connection succeeds and data is retreived etc.
NOW - the exact error here I think I identified. OC4J loads ORAI18N - an older version (at least different from) compared to the one that comes with instant client. I put the instant client's ORAI18N in the "pre-path" load (that setting you refer to) and I'm now at a different loader constraint for sql/oracle/OPAQUE. Trying to identify which library, if any, that OC4J is providing which shouldn't be there.
I've read the note that explains how to install a different version of JDBC with OC4J. Problem is, that instant client doesn't come with CLASSES12DMS - and secondly I've tried to replace the DMS version with a link to OJDBC14 and it staill failed.
In a way this particular thread got resolved last night - but I still have the same basicly problem. Getting a different JDCB version using OCI to work from within OC4J 10.1.x.

I cannot Disable a constraint in SQL Developer

Here is my issue:
I have created a table already named practice1.
Using SQL Developer PL/SQL try to run a loop as following:
DECLARE
COUNTER1 NUMBER(2);
BEGIN
COUNTER1 := 30;
ALTER TABLE practice1
DISABLE CONSTRAINT PRK1;
LOOP
COUNTER1 := 30;
INSERT INTO PRACTICE1
VALUES (COUNTER1, 'test7', 8, 9);
EXIT WHEN COUNTER1 >26;
END LOOP;
END;
In other words I Insert the COUNTER1 variable value as Primary Key in the tables field1 column.
I run the script successfully without the ALTER TABLE DISABLE CONTSRAINT.. command.
Everytime I run it I had to increase the starting value of Variable COUNTER1 so it will not attempt to insert a duplicate pre-existed value in Primary Key.
Then I decided to insert the command ALTER TABLE DISABLE CONSTRAINT in order to not have to worry to change the starting value.
I am able to disable the constraint by using the same command in isolation . If I run it as part of the script as above I get the following error:
Error report:
ORA-06550: line 5, column 1:
PLS-00103: Encountered the symbol "ALTER" when expecting one of the following:
   ( begin case declare end exception exit for goto if loop mod
   null pragma raise return select update while with
   <an identifier> <a double-quoted delimited-identifier>
   <a bind variable> << continue close current delete fetch lock
   insert open rollback savepoint set sql execute commit forall
   merge pipe purge
06550. 00000 - "line %s, column %s:\n%s"
*Cause:    Usually a PL/SQL compilation error.
*Action:
I would appreciate any suggestions.
Thank you.

Your question has NOTHING to do with sql developer.
Mark this question ANSWERED and repost it in the SQL and PL/SQL forum.
https://forums.oracle.com/community/developer/english/oracle_database/sql_and_pl_sql
The problem is that you CANNOT execute DDL directly in PL/SQL. You need to use dynamic SQL to execute DDL within PL/SQL.
EXECUTE IMMEDIATE 'ALTER TABLE . . .';
If you need more help use the correct forum as shown above.

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I found this from Asktom very nice. It will help u a lot.
http://asktom.oracle.com/pls/ask/f?p=4950:9:1988009758486146475::NO:9:F4950_P9_DISPLAYID:8806498660292

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Hi to u all,
Can someone tell me where the abstract methods in some interfaces in the java.sql package are implemented?
For example:
-- START CODE --
ResultSet rs = null;
try
ps = db().prepareStatement("select * from aTable where x=?");
ps.setInt(1, aValue);
rs = ps.executeQuery();
ResultSetMetaData md = rs.getMetaData();
-- END CODE --
It's about the getMetaData()-call.
It returns information about the column names in the resultset.
If I open the declaration (eclipse) the abstract method getResultSet() in the interface ResultSet in the java.sql-package is shown.
So where is the actual implementation of the method??
As a collegue told me he suspected the implementation is probably somewhere in the driver-software. If this is the case, how does the JVM know to find it there?
Thx in advance for your time and answer(s)

The JDBC driver implements the JDBC API.
The JVM how to know that?
1. The Class.forName("jdbc driver name") will load the driver into memory.
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Dynamic Rule based implementation in PL/SQL

Hi,
We are trying to implement a dynamic rule based application in Oracle 9i. Its simple logic where we store expressions as case statments and actions seperated by commas as follows.
Rule: 'Age > 18 and Age <65'
True Action: 'Status = ''Valid'' , description = ''age in range'''
False Action: 'Status =''Invalid'', Description=''Age not in range'''
Where Age,Status, description are all part of one table.
One way of implementing this is fire rule for each record in the table and then based on true or false call action as update.
i.e
select (case when 'Age > 18 and Age <65' then 1 else 0 end) age_rule from tableX
(above query will in in a cursor xcur)
Then we search for
if age_rule = 1 then
update tablex set Status = ''Valid'' , description = ''age in range'' where id=xcur.id;
else
update tablex set Status =''Invalid'', Description=''Age not in range'' where id=xcur.id;
end if;
This method will result in very slow performance due to high i/o. We want to implement this in collection based method.
Any ideas on how to dynamically check rules and apply actions to collection without impact on performance. (we have nearly 3million rows and 80 rules to be applied)
Thanks in advance

Returning to your original question, first of all, there is a small flaw in the requirements, because if you apply all the rules to the same table/cols, than the table will have results of only last rule that was processed.
Suppose rule#1:
Rule: 'Age > 18 and Age <65'
True Action: 'Status = ''Valid'' , description = ''age in range'''
False Action: 'Status =''Invalid'', Description=''Age not in range'''
and Rule#2:
Rule: 'Name like ''A%'''
True Action: 'Status = 'Invalid'' , description = ''name begins with A'''
False Action: 'Status =''Invalid'', Description=''name not begins with A'''
Then after applying of rule#1 and rule#2, results of the rule#1 will be lost, because second rule will modify the results of the first rule.
Regarding to using collections instead of row by row processing, I think that a better approach would be to move that evaluating cursor inside an update statement, in my tests this considerably reduced processed block count and response time.
Regarding to the expression filter, even so, that you are not going to move to 10g, you still can test this feature and see how it is implemented, to get some ideas of how to better implement your solution. There is a nice paper http://www-db.cs.wisc.edu/cidr2003/program/p27.pdf that describes expression filter implementation.
Here is my example of two different methods for expression evaluation that I've benchmarked, first is similar to your original example and second is with expression evaluation moved inside an update clause.
-- fist create two tables rules and data.
drop table rules;
drop table data;
create table rules( id number not null primary key, rule varchar(255), true_action varchar(255), false_action varchar(255) );
create table data( id integer not null primary key, name varchar(255), age number, status varchar(255), description varchar(255) );
-- populate this tables with information.
insert into rules
select rownum id
, 'Age > '||least(a,b)||' and Age < '||greatest(a,b) rule
, 'Status = ''Valid'', description = ''Age in Range''' true_action
, 'Status = ''Invalid'', description = ''Age not in Range''' false_action
from (
select mod(abs(dbms_random.random),60)+10 a, mod(abs(dbms_random.random),60)+10 b
from all_objects
where rownum <= 2
insert into data
select rownum, object_name, mod(abs(dbms_random.random),60)+10 age, null, null
from all_objects
commit;
-- this is method #1, evaluate rule against every record in the data and do the action
declare
eval number;
id number;
data_cursor sys_refcursor;
begin
execute immediate 'alter session set cursor_sharing=force';
for rules in ( select * from rules ) loop
open data_cursor for 'select case when '||rules.rule||' then 1 else 0 end eval, id from data';
loop
fetch data_cursor into eval, id;
exit when data_cursor%notfound;
if eval = 1 then
execute immediate 'update data set '||rules.true_action|| ' where id = :id' using id;
else
execute immediate 'update data set '||rules.false_action|| ' where id = :id' using id;
end if;
end loop;
end loop;
end;
-- this is method #2, evaluate rule against every record in the data and do the action in update, not in select
begin
execute immediate 'alter session set cursor_sharing=force';
for rules in ( select * from rules ) loop
execute immediate 'update data set '||rules.true_action|| ' where id in (
select id
from (
select case when '||rules.rule||' then 1 else 0 end eval, id
from data
where eval = 1 )';
execute immediate 'update data set '||rules.false_action|| ' where id in (
select id
from (
select case when '||rules.rule||' then 1 else 0 end eval, id
from data
where eval = 0 )';
end loop;
end;
Here are SQL_TRACE results for method#1:
call count cpu elapsed disk query current rows
Parse 37 0.01 0.04 0 0 0 0
Execute 78862 16.60 17.50 0 187512 230896 78810
Fetch 78884 3.84 3.94 2 82887 1 78913
total 157783 20.46 21.49 2 270399 230897 157723
and this is results for method#2:
call count cpu elapsed disk query current rows
Parse 6 0.00 0.00 0 0 0 0
Execute 6 1.93 12.77 0 3488 170204 78806
Fetch 1 0.00 0.00 0 7 0 2
total 13 1.93 12.77 0 3495 170204 78808
You can compare this two methods using SQL_TRACE.

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all references to PROD in the cloned DEV instance. Everything is done manually and takes a couple of hours.
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Life is hard, but it's harder when you're stupid! John 'Duke' Wayne

This question should be posted on PeopleSoft support forum. That being said, a quick search on the internet will provide helpful links like below: http://www.erpassociates.com/peoplesoft-corner-wiki/peoplesoft-administration/cloning-a-peoplesoft-database.html
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I am in process of converting SQL 2000 database to Oracle 9i. OMWB has commented "Fetch First" as
/*[SPCONV-ERR(60)] FETCH FIRST is not supported in Oracle. */.
Is there any work around for FETCH FIRST ( SQL 2000) in PL/SQL?

Fetch First returns the first row of a query.
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Regards,
Turloch
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SCD's implemention using T-SQL version 2005 (with out merge)

Business logic:
--we are quarterly updating data on table with respective of cus_ID’s
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for your reference,
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Optional feature not implemented while using SQL server

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I am using SQL server.
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How to implement this in SQL?

Assure that there is table t1 with the following fields and values:
Field1 field2 Field3
A B 10
A C 20
And there is another table t2 with the following fields and values
Field2
B
C
D
How to write a query to join the two tables with the following output
A B 10
A C 20
A D NULL
Thank you in advance
Regards,
Marser

Assure that there is table t1 with the following fields and values:
Field1 field2 Field3
A B 10
A C 20
And there is another table t2 with the following fields and values
Field2
B
C
D
How to write a query to join the two tables with the following output
A B 10
A C 20
A D NULL
Thank you in advance
Regards,
Marser
Looks like you can achieve this by using LEFT JOIN, but have query in the logic( even though nothing is explained in the post), if the value is NULL for D, how the first column contains A? isn't is supposed to be NULL, or if it has some other logic, post it.
Please use Marked as Answer if my post solved your problem and use
Vote As Helpful if a post was useful.

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Thanks!

Ref cursors are an ugly solution (different though in 11g).
You build a dynamic SQL. It must/should have bind variables. But a ref cursor does not allow you to dynamically bind values to bind variables. You need to code the actual bind variables into the code as part of the open cursor command. And at coding time you have no idea how many bind variables there will be in that dynamic SQL for the ref cursor.
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E.g.
SQL> create or replace package query as
2 procedure Emp( c in out sys_refcursor );
3 procedure Emp( c in out sys_refcursor, nameLike varchar2 );
4 procedure EMp( c in out sys_refcursor, deptID number );
5 end;
6 /
Package created.
SQL>
SQL> create or replace package body query as
2
3 procedure Emp( c in out sys_refcursor ) is
4 begin
5 open c for select * from emp order by 1;
6 end;
7
8 procedure Emp( c in out sys_refcursor, nameLike varchar2 ) is
9 begin
10 open c for select * from emp where ename like nameLike order by 1;
11 end;
12
13 procedure EMp( c in out sys_refcursor, deptID number ) is
14 begin
15 open c for select * from emp where deptno = deptID order by sal;
16 end;
17 end;
18 /
Package body created.
SQL>
SQL> var c refcursor
SQL> exec query.Emp( :c, 'S%' )
PL/SQL procedure successfully completed.
SQL>
SQL> print c
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7369 SMITH CLERK 7902 1980-12-17 00:00:00 800 20
7788 SCOTT ANALYST 7566 1987-04-19 00:00:00 3000 20
SQL>

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Hi There,
My company are implementing SAP with SQL Server 2005. I have the responsibility of creating the backup strategy. We will not be using Tape Media to back up - all our backups are carried out to DISK (SAN).
Please can anyone state the recommended way to do this i.e. through the SAP DBA Calendar or through SQL Studio Manager.
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HI,
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logon to SQL server management Studio,
under object explorer navigate through server object -> backup devices
create new backup device -- destination file type.
when you schedule backup using DB13 it's take the backup on this location ( disk )
regards,
kaushal

Problems implementing java.sql.ResultSet on AbstractTableModel

Hi java Gurus !!
I have a trouble implementing interface java.sql.ResultSet on javax.swing.table.AbstractTableModel. The AbstractTableModel class defines a method like
this:
int findColumn(String column)
while the java.sql.Resultset defines a method as follows:
int findColumn(String column) throws SQLException.
the compiler gives me the following error:
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thanks a lot !!!!

Hassen is correct, it seems that you mix two different things.
Can you show code excerpts so we can give you some tips ?

Implementing constraints in sql

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