Using bind variable to allow the user the place where complete clause.
HelloI have a question like that I am able to run in SQL_Developer:
SELECT INITCAP(c.name) AS "Species Name"
, AVG(b.height) AS "Avg Height (m)"
FROM smt_plot_index a
, smt_photo_plot_data b
, smt_species_names c
WHERE a.plot_id = b.plot_id
AND b.species_name_id = c.species_name_id
AND a.plot_id IN (2473201,2473202)
GROUP BY c.name
But I'd like to do the following in an apex application:SELECT INITCAP(c.name) AS "Species Name"
, AVG(b.height) AS "Avg Height (m)"
FROM smt_plot_index a
, smt_photo_plot_data b
, smt_species_names c
WHERE a.plot_id = b.plot_id
AND b.species_name_id = c.species_name_id
AND a.plot_id IN ( :P11_ENTER_PLOT_NUMBERS )
GROUP BY c.name
But this returns an error:error report:
ORA-01722: invalid number
I know that if I included only one number for example 2473201 in the element: P11_ENTER_PLOT_NUMBERS it market, but if I try and enter the following text in the element 2473201,2473202 it does not work. The screen session state, said that the value of the item is correct depending on how I entered it.
Anyone have any solutions for this?
Thank you
Ben
Published by: Benton on May 6, 2010 13:54
Very strange... read the whole message again, there is already something, you should change: INSTR (': ' |: P11_ENTER_PLOT_NUMBERS |': ',' :'|| a.plot_id |': ') > 0 use INSTR ("," |: P11_ENTER_PLOT_NUMBERS |) ',', ',' || a.plot_id | ', ') > 0
When you use one as a separator instead of:
You can try to run in the SQL Developer and see how it works?
If it works, then you would look in session state to see what values are actually used.
I tried with BLAKE as a value in P1_TEST and that seems to work:
Select *.
WCP
where INSTR (': ' |: P1_TEST |': ',' :'||) Ename |': ') > 0
Hope that helps,
Dimitri
Tags: Database
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By DB version 11 GR 2
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Here are the values of the variable binding.B1 VARIABLE VARCHAR2 (32);
B2 VARIABLE VARCHAR2 (32);
B3 VARIABLE NUMBER;
B4 VARIABLE VARCHAR2 (32);
B7 VARIABLE VARCHAR2 (32);
B5 VARIABLE NUMBER;
B6 VARIABLE NUMBER;EXEC: B1: = 'NONE ';
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EXEC: B4: = NULL;
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933257 wrote:
((SF. C1_IDCODE =: B4) OR (NVL (: B4, 'NONE') = 'NONE'))
In fact for literals, I did not find any section of the predicate after running the sql code with activation "set autotrace traceonly explain."
The main problem is with another large query whose cardinality is underestimated due to the presence of these table (table1, table2) with the above mentioned clause, and the query is for the analysis of index + nested with values of Bind loops and take 10 hr +, whereas with literals, its completion in ~ 8minutes with FTS + Hash Join.
Your real problem is that you try to have just a single SQL query handle all POSSIBLE thanks to the use of embedded FILTERS ' either / or ' filters in the WHERE clause. You want only a select this OPTION to run whatever filters have been selected at run time by the user or the application using it. And it would never work. You really need to SELECT different queries for different combinations of filter conditions.
Why? Think for a minute. How Oracle works internally? A SQL SELECT query gets analyzed and an execution plan is produced which is stored in the library cache and gets REUSED on all subsequent executions of this query - except in certain cases where there may exist several plans run through several cursors of the child. So with only SELECT a query you only AN execution plan in the library cache, to be used by all THE executions of this query, regardless of the value of your run-time binding variables.
Lets put another way - each library cache execution plan is associated with a SQL statement. If you want a DIFFERENT execution plan then you need run a DIFFERENT SQL statement. That's how you get a different execution plan - by running a different SQL statement. Running the SAME SQL query generally you will get the SAME execution plan every time.
In addition, because of the "either / or" filters that you use you will end up generally with a full Table Scan on each of the referenced tables. Why? Given that the optimizer must produce an implementation plan that manages all possible contingencies for all values of possible bind variables in the SELECT. If the optimizer should choose to use any index based on one of these "either / or" filters then it would only help performance when real value was provided, but it would be really bad if a NULL value was supplied. If the optimizer ends up ignoring the index because they are not always optimal for all possible input values and instead chose a plan that is "good enough" for all input values possible. That means that it will use a scanning Table full.
I hope you can see that it is precisely what is happening for you with your query. You select this OPTION to manage the different combinations of filter, which leads to the execution plan only one, which leads to scans full Table on the referenced tables in these ' either / or ' filters.
The solution? Build queries SELECT DIFFERENT when input values are NULL. How you do that? Read this article to ask Tom that tells you:
http://www.Oracle.com/technetwork/issue-archive/2009/09-Jul/o49asktom-090487.html
To sum up - when you have real value for a bind variable 'bind_var1' add the following filter to your CHOICE:
AND column_name1 =: bind_var1
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Now, you'll have 2 queries SELECT must be performed, which have exactly the same number of variables in the same order bind, which is important. When you then run one of these variations, Oracle can analyze and optimize each one SEPARATELY, with a single execution by the SELECT query plan.
When you provide a real value, the filter is a normal 'column = value' that the optimizer can use all indexes on this column, because NULL values are not referenced.
When there is no real value, the optimizer will analyze the '1 = 1 GOLD' and realize that "1 = 1" is set to TRUE and GOLD, it is quite TRUE regardless because the binding variable is null or not. This means that the optimizer will actually REMOVE this filter, because it filters nothing because it is always TRUE. You will end up with an operating plan based on the other filters in the query, which is what you want because you have no filter on this column.
What is it - producing distinct SELECT queries to determine if you have a real value to filter or not you end up with DIFFERENT execution plans for each of them, and each of them is OPTIMAL for this particular set of filters. Now you get good performance for each variation of the performance of the SELECTION, rather than sometimes good and sometimes very bad when using SELECT only one. It is impossible to try to get multiple shots of execution 'optimal' out of a SELECT query. That's why you get mediocre performance under different bound the values of the variables.
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Looks like the wizard to create a report query in the shared components has a bug related to bind variables. I was able to reproduce your problem. Just create the query using the link variable, check the box to include session state, add the item and create the query. When you use the report query to download the report, where the your clause will work fine.
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END OPERATIONS;user10828299 wrote:
Please suggest, it should be easy for oracle experts...You have made a typo. bind variables are preceded by two points, while you put a colon in front of the equality operator that he listens to it in the PL/SQL assignment operator. Change:
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Change:
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