Need help with dynamic where clause.

Hello world.  I'm kind of a novice with PL/SQL, so please be patient with me.  I am building a web application using Weblogic Oracle 11 g and Oracle database.

To make a long story short, I need to generate the complex dynamic WHERE clause.  I don't know what will be the name of the column or the operator of comparison or the value will be until the moment of execution.

I'm not 100% certain, but I think I need to use dynamic SQL statements.  Unless there is a better way to do it.

I'm sure that using dynamic SQL opens me up to SQL injection attacks if I use simple string concatenation.  I would like to use bind variable if possible.

In any case, it seems like trying to build a dynamic where clause does not seem to work as I want it would be...

bv1 := 'colA = 5 and colB >= 9';

query_str := 'SELECT * FROM view WHERE :bv1';

OPEN CUR FOR query_str USING bv1;

The code above pours out when I try to run it.

Is there a way to build dynamic where the provisions without the use of concatenation of simple string that leaves me open to attacks by SQL injection?

Thank you

Hello.  I have read briefly upward on things, you suggested, but it seems a bit abstract for me since I was a novice.

Can you give us an explanation or an example of how to use it to accomplish what I need to do?

Do ypu really plan create a query with a WHERE clause that contains a predicate for all possible columns?

Variable bind offer performance when the same query is executed several times with different values for bind variables.

Select * from emp where empno =: v_empno

After the first run Oracle will always be this query in the library cache. The next running can use the version of the cache even if the bind value is different.

Select * from emp where empno =: v_empno;

Select * from emp where ename =: v_ename;

Select * from emp where sal =: v_sal;

Each one is a DIFFERENT query. Yes - each of them uses a variable binding, but queries are different.

So, if your username select EMPNO, an '=', and a value from the first query can be executed. But the next time that the user can select the ENAME column so that 'stored' first request may not be used given that the query does not match.

The third time your user selects SAL so none of the first two queries can be used in the library cache. The use of bind variables gives performance during the SAME QUERY is used multiple times with DIFFERENT values for the variable binding. Oracle is not to analyze the hard query everything simply because the VALUE is different.

So bind variables do not help you if most of the queries were completely DIFFERENT sets of predicates. And SYS_CONTEXT will not help either since that simply provides a way to define binds the values of the variables.

Just for the simple example above, there are at least SIX possible combinations of columns that could choose your user name: empno, ename, sal, empno ename, empno & sal, ename & sal

Tags: Database

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  • Need help with the launching track pack for forza code 4

    Bought new Forza 4 and the lancer Track Pack code does not work, how do I get a code that is generated in the form I've already paid for it. Rank of loads of numbers and sent 10 s of emails but cant seem to get help.

    This is the help I get when the cat to an Ambassador xbox on xbox.com

    Terry wrote:
    Need help with the launching track pack for forza code 4
    The Xbox Ambassador says:
    Location of Ambassador of the community...
    The Xbox Ambassador says:
    Location of Ambassador of the community...
    The Xbox Ambassador says:
    Your question will be answered by an Ambassador of the Xbox. You have been connected to the Ambassador as a user Xbox [3]
    The Xbox Ambassador says:
    Hello
    Terry wrote:
    Hello
    The Xbox Ambassador says:
    Hey
    Terry wrote:
    just to be on the phone to xbox live support and was told to come here
    The Xbox Ambassador says:
    ok\
    The Xbox Ambassador says:
    What is your problem?
    Terry wrote:
    I bought the 4 for forza ansd 360 new sealed Christmas...
    Terry wrote:
    has got 2 codes that accompanies the game but the pack track code does not work
    The Xbox Ambassador says:
    Wow good
    Terry wrote:
    whenever I put in the code it says code redeemed
    The Xbox Ambassador says:
    I think the code is used. You must return to the retailer
    Terry wrote:
    I tried to, but since I already opened the case they will not accept
    The Xbox Ambassador says:
    Oh. No,
    Terry wrote:
    the code had been used or defective as I am the only person who has touched the game once opened, tried to enter the code when it is open
    The Xbox Ambassador says:
    Maybe it was auto bought?
    Terry wrote:
    so, how do I get another code generated track Pack if defective?
    The Xbox Ambassador says:
    I do not know.
    Terry wrote:
    bought the game new, so I get the track pack
    The Xbox Ambassador says:
    Oh. It's bad.
    The Xbox Ambassador says:
    I think that if you Exchange 1 code it will buy it
    Terry wrote:
    car pack code worked, starter pack did not work
    The Xbox Ambassador says:
    Oh.
    The Xbox Ambassador says:
    It's a bad
    The Xbox Ambassador says:
    BTW you have an evolution of the tests?
    Terry wrote:
    Yes, I want to? but more anxious to get a code object generated for this pack
    The Xbox Ambassador says:
    Hey if I help can u give me this game too?
    Terry wrote:
    ?????????????????
    Terry wrote:
    So is it possible to get a code for that time?
    The Xbox Ambassador says:
    Hey
    The Xbox Ambassador says:
    Yes.
    The Xbox Ambassador says:
    you need to contact them
    The Xbox Ambassador says:
    and tell them that the code is used.
    Terry wrote:
    I was told to come here? where can I go to get the code?

    Hi Terryg76,

    ·         What version of the operating system is installed on the computer?

    I suggest you to contact the game manufacturer for more help and information.

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