Prepared Statement nested calls (Oracle)

I have a prepared statement like
select type
, id
from ms_page_position where page_id =
(select id from ms_url where url = ?)
and column_id =
(select id from ms_column where name = ?)
and preview = ? order by position asc.
If i place in
pstmt.setString(1, "/news/");
pstmt.setString(2, "RIGHTCOLUMN");
pstmt.setString(3, "Y");
res = pstmt.executeQuery();The three fields are strings
i get this error -
java.sql.SQLException: ORA-01460: unimplemented or unreasonable conversion requested.
If i use a straight statement object and concatenate strings then i have no problem. Can you use prepared statements with nested selects - ?
Cheers

I've exactelly the same problem. Any ideas how to solve this. Concatenation works fine but two setString() on PS couses this exception.

Similar Messages

Prepared Statement with SQL 'IN' Clause

Hi,
I am trying to write a JDBC SQL call to a database using a prepared statement, the call looks something like:
select *
from table
where field in (?, ? ,?)
this thing is that i don't know how many 'IN' parameters are needed until runtime (they come from a List), so is there an easy way of dealing with this, I haven't been able to find any information on this problem anywhere?

>
Hmmm...more expensive than say doing a query on on 2 billion rows with no index?
More expensive than doing a cross server join?
More expensive than doing a restore?
I knew that someone would point this out. :)
I just tried to exaggerate the importance of cursor sharing. This is one of the most important topic in DBMS world, but quite often ignored by JAVA world. I hope that you understand my good intention.
>
2. Insert data corresponding to bind variable to "T". Interesting idea. Please provide the algorithm for that. The only ones I can come up with
1. Involved creating a "dynamic" SQL for the insert
2. Doing multiple cross network inserts.
The first of course is exactly what you said your solution prevented. The second will be more expensive than sending a single dynamically created select.Hopefully, this is not just an "interesting" idea, but very common technique in DBMS. Actually one of the common techniques. There are couple of ways to handle this kind(variable number of bind variables in "IN" clause) of problem.
What i commented was that the simplest one. It's like this:
(based on Oracle)
SQL> create global temporary table bind_temp(value int);
PreparedStatement stmt = con.prepareStatement("INSERT INTO bid_temp VALUES(?)");
for(...) {
stmt.setInt(1, aValue)
stmt.addBatch();
stmt.executeBatch();
Statement stmt2 = con.executeQuery("SELECT * FROM target_table WHERE id IN (bind_temp)");
...Doesn't it look pretty? Pretty for both Java developers and DBAs.
By virtue of the mechanism of batch processing, the total DBMS call is just twice and you need just 2 completely sharable SQL statements.
(Hopefully you might understand that Oracle global temporary table is just session scope and we don't need them to be stored permanently)
Above pattern is quite beneficial than these pattern of queries.
SELECT * FROM target_table WHERE id IN (?)
SELECT * FROM target_table WHERE id IN (?,?)
SELECT * FROM target_table WHERE id IN (?,?,?)
SELECT * FROM target_table WHERE id IN (?,?,?,?,.......,?)
If you have large quantity of above patterns of queries, you should note that there are another bunch of better techniques. I noted just one of them.
Hope this clairfies my point.

Oracle Called vs. Prepared Statement - Know the difference?

If anyone can explain why i would use one rather than the other I would appreciate it.
Thanks,
CHris

Chris,
A Prepared Statement is parsed and compiled SQL statement. It is intended to be executed a number of times and can contain placeholders (See the answer to you question above).
A Callable Statement allows Oracle stored procedures, packages and functions to be executed from inside Java.
hth
Simon
null

Oracle Prepared Statement and spaces in field

I have a field that is defined as char(10). It has characters like '39' in it. When I select against it using standard SQL (where clause) I get results. When I use it in the where clause of a prepared statement it does not return any rows.
If I have the field defined as char(2) the prepared statement works.
If I have the field defined as varchar2(10) and loaded with '39' the prepared statement works.
If I have the field defined as varchar2(10) and loaded with '39 ' the prepared statement returns no results.
I really do not think this is a JDBC problem. However, since Oracle's site basically <expletive deleted>, I am hoping someone here has a solution.
Thanks in advance if you can help.

Let me clarify.
I cannot remove the whitespace from the data in the database. I do not need the whitespace to do the query if I am not using a Prepared Statement. This seems to be a problem with the way Oracle is handling the prepared statement. (hence.. my thinking that this is really not a JDBC problem at all.. but I could be wrong.)

Using once created prepared statement with different connections in Oracle

Can I use same statement cash using different connections in Oracle
For example I have a prepared statement p1. After its using i close connection (return it to the pool)
Next time I want use p1 statement using another connection.
Question : When I creat p1 in second time ,is it returned from cash or created as a new statement. And what I should do to use once prepared statement using differend connections.
Thaks.

As far as I know a PreparedStatement lives and dies with the Connection that created it. So, you cannot use a PreparedStatement with other Connection instances than the one that created it.
You will have to recreate the PreparedStatement for each time you open a connection, or use the same PreparedStatement and NOT close the Connection in between. The last suggestion can be risky though, if you never close the connection...
Jakob Jenkov
www.jenkov.com

Oracle Cached Prepared Statement

We recently upgraded from WL 8.1 SP3 to WL 9.2 and in the process updated the JDBC Driver for Oracle from 10.2.0.1 to 10.2.0.2. After we went live we started seeing issue in one table. The table contains some special character which is not suppose to be there.
Here is the code & table details
PreparedStatement pstmt = cn.prepareStatement("INSERT INTO INFO_TABLE(user_name,user_status) values (?,?)");
pstmt.setString(1,requestObject.getUserName());
if(requestObject.isValidUser)
pstmt.setInt(2,requestObject.getStatus());
}else
pstmt.setNull(2,Types.VARCHAR);
cn.commit();
Table description:
USER_NAME VARCHAR2(60);
USER_STATUS VARCHAR2(5);
- The USER_STATUS columns valid values are 0-4 or NULL.
The problem is on certain occasions the valid user value in the table is some special character. I got the ascii value of this character as 128. We don't know yet whether setting int value and varchar (null) value on two different flow (but cached prepared statement) is the issue.
We can fix the code to use uniform data type but we need to be sure this is what causing the problem. Further when I read the docs http://e-docs.bea.com/wls/docs90/jdbc_admin/jdbc_datasources.html
I can associate the problem I face with this pointer however as I said, we need some sort of confirmation to make this change in the production code.
Here is what I am specifically looking for
1. Is there a way to confirm this problem?
2. Can we log the prepared statement being executed and the binded value being sent to the Oracle DB?
I suspect the VARCHAR null type is being casted to int value 128.
Would really appreciate any pointers on this.
Thanks

Purushothaman Thambu wrote:
We recently upgraded from WL 8.1 SP3 to WL 9.2 and in the process updated the JDBC Driver for Oracle from 10.2.0.1 to 10.2.0.2. After we went live we started seeing issue in one table. The table contains some special character which is not suppose to be there.
Here is the code & table details
PreparedStatement pstmt = cn.prepareStatement("INSERT INTO INFO_TABLE(user_name,user_status) values (?,?)");
pstmt.setString(1,requestObject.getUserName());
if(requestObject.isValidUser)
pstmt.setInt(2,requestObject.getStatus());
}else
pstmt.setNull(2,Types.VARCHAR);
cn.commit();
Table description:
USER_NAME VARCHAR2(60);
USER_STATUS VARCHAR2(5);
- The USER_STATUS columns valid values are 0-4 or NULL.
The problem is on certain occasions the valid user value in the table is some special character. I got the ascii value of this character as 128. We don't know yet whether setting int value and varchar (null) value on two different flow (but cached prepared statement) is the issue.
We can fix the code to use uniform data type but we need to be sure this is what causing the problem. Further when I read the docs http://e-docs.bea.com/wls/docs90/jdbc_admin/jdbc_datasources.html
I can associate the problem I face with this pointer however as I said, we need some sort of confirmation to make this change in the production code.
Here is what I am specifically looking for
1. Is there a way to confirm this problem?
2. Can we log the prepared statement being executed and the binded value being sent to the Oracle DB?
I suspect the VARCHAR null type is being casted to int value 128.
Would really appreciate any pointers on this.
ThanksHi. I don't think there's any issue with WebLogic here, but the code you show
might confuse some drivers. I highly recommend using setString for all
varchar/char/varchar2 columns, not setInt(). If requestObject.getStatus()
has to return an int, try this:
if(requestObject.isValidUser)
pstmt.setString(2, (""+ requestObject.getStatus()) );
Joe

Prepared statement cache & Oracle

Hi -
Does Weblogic's prepared statement caching only work when using their
type-2 Oracle driver? Are there any documents about using this
Weblogic feature? I have only found small references in the Weblogic
documentation so far -- nothing with much detail.
Thanks for any help,
- Mark

"Joseph Weinstein" <[email protected]> wrote in message
news:[email protected]..
>
>
Mark Cassidy wrote:
Hi -
Does Weblogic's prepared statement caching only work when using their
type-2 Oracle driver?No. It is generic to JDBC. Any JDBC driver should allow re-use ofPreparedStatements,
and our pool will cache for any driver.
Are there any documents about using this
Weblogic feature? I have only found small references in the Weblogic
documentation so far -- nothing with much detail.You are correct that there is too little documentation at this time.
Thanks for any help,
- Mark
Thanks Joe!
Do you know if each connection's cache is FIFO? Or do you use
least-recently-used algorithm?
I found one comment you made regarding XA pools. That means that if we are
doing 2-phase commit processing that some of these benefits could erode? I
didn't understand why. If we assume that the connections in a given pool
after a time get a good sampling of popular prepared statements, would their
being XA or not matter? Maybe I missed your point entirely.
- Mark

Oracle Prepared Statement - 8.1.7 JDBC type II Driver

Hi,
I have a strange problem.
I do a query using a prepared statement and there are no matching results.
I change this to hardcoded SQL Statement and pass in the same value a row of record is returned
I change this to Statement and pass in the input a row of record is returned.
This is puzzling. There seems to be a problem with Prepared Statement and I can't see why that fails.
The Stmt looks like this
PreparedStatement id is defiend as a char in the database
Code Snippet:
SQL = Select * from employee where id = ?;
pstmt.setString(1,'value');
Hardcoded SQL:
select * from employee where id = 'value';
Statement Impl:
String var = "value";
"select * from employee where id = '" + var+ "'";
Would appreciate if somebody can explain what's happening. To me it is bizarre!
Thanks,
Manglu

Update to problem
I have the latest (classes12.zip) JDBC drivers from Oracle.
We are running Oracle 8.1.6 and converting to Oracle 8.1.7.
This works the same with both.
Example, I have a column (char(10)) with trailing spaces. i.e. '39 '.
When I perform a Prepared Statement with that column in the where clause, it returns no result rows.
When I perform a standard statement with that column in the where clause, it returns rows.
When I define a column char(2) and use it in the where clause it works fine.
When I define a column varchar2(10) and load it with data like '39', it works fine.
When I define a column varchar2(10 and load it with data like '39 ', it does not work.
When I execute this same Prepared Statement through the jdbc:odbc bridge it works fine.
I cannot change the definition of the columns as they are foreign key data. What is the problem here? Any help is appreciated.
If you need further information please feel free to contact me.

How to call method in JCD - which will execute prepared statement

Hi All,
I have a scenari where I have to call method in JCD, where in this method I have to execute prepared statement and return value.
Please suggest me how to do this.
Thanks & Regards,
Anitha.B

hi bolla,
this is 100% java code. can you elaborate a little more what is your exact problem?
i think your scenario is easy to accomlish.
regards chris

Problem with Oracle Prepared Statement

Hi all,
Please help me..
I Have 2 pages, in first page i had table with rows with update image for each row, when i click update it leads to 2nd page which shows the particular row information
my problem is, i am executing prepared statement with 2 parameters in 2nd page controller which is working fine first time, when i go to first page and comes to 2nd page again my
result set showing Null, some times query executing and getting results, some times null, i am confused with this behaviour. please help me ..
Thanks all

Hi ,
How your table is being popluated ? You have executed VO in PR or PFR ?
Please give snippet of your CO code , both after navigating from first page to second and again after coming back to first page .
Also is same AM is retain or not ?

Proving prepared statements are being reused

How can I prove that a prepared statement from a JDBC driver is being reused / pooled ?
What essentially I want to do is to have prepared statements reused to reduce hard parsing ... but I also need to prove that the statements are being reused. If I query the statement in V$SQLAREA, the column PARSE_CALLS does not seem to be distinguish between hard parse and soft parse:
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96536/ch3204.htm#1126299
I am only interested for now in proving the just ONE statement is being reused ... which mean that the number of hard parses is very low compared to the number of soft parses for that ONE statement.
Regards,
jms
Message was edited by:
jms

Hi,
No, parse calls is all soft and hard parse together. What you would see, if used absolutely correctly, would be 1 hard parse per session and many executions.
But since v$sql is obviously not linked to v$session other than at the time of exection, you see the aggregated parse calls and executions for each cursor. So what you should see is parse calls go up relatively slowly to the number of exections.
However, you can see soft and hard parses using the v$sesstat and v$statname views so you can see soft and hard parses on a session by session basis, be these are again aggregated, so you can't see soft / hard counts per cursor, only the total for a session.
What I see a lot of the time is they don't get it quite right, so hard parses is low but soft parses are high, so they are still parsing when they don't need to, but at least they are binding and using shareable SQL, which is a step in the right direction.
When I say 'they', it is a generic reference to all Java/.Nyet programmers writing front end code where they just don't 'get' parsing and binding because it's just too complicated and hey, SQL Server isn't like this...!
HTH
Chris

ArrayIndexOutOfBoundsException when setting a date in a prepared statement

Hi,
was wondering if anyone could help. I have a prepared statement, with two "variables" in it. I need to set the first of these to a string (using setString(1, "string)
and the second to a date, using setDate(2, SQLDate)
My SQL date is a valid date ass I've run a debugger and checked, but everytime setDate is called an Array Out Of Bound Exception is thrown. Can anyone shed any light on this as I'm rather confused as to why this is happening!
Thanks in advance

I havent got a small runnable example to hand, but taking an excert from my code I have:
for (int i = 0; i < this.columnNames.size();i++)
singleDateEventFlagSingleArea.setString(1, newAreaName);
singleDateEventFlagSingleArea.setDate(2, Date.valueOf((String) this.columnNames.get(i)));
eventFlagsResult = singleDateEventFlagSingleArea.executeQuery()
}newAreaName is a argument passed to the method. columnNames is a vector of dates/strings, which I parse back into a date to pass to the setDate method
Where the value of the date in the statement is changed to a preset value each iteration.
The exception stack I'm getting is:
exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 1
     at oracle.jdbc.dbaccess.DBDataSetImpl._getDBItem(DBDataSetImpl.java:378)
     at oracle.jdbc.dbaccess.DBDataSetImpl._createOrGetDBItem(DBDataSetImpl.java:781)
     at oracle.jdbc.dbaccess.DBDataSetImpl.setBytesBindItem(DBDataSetImpl.java:2399)
     at oracle.jdbc.driver.OraclePreparedStatement.setItem(OraclePreparedStatement.java:1134)
     at oracle.jdbc.driver.OraclePreparedStatement.setDate(OraclePreparedStatement.java:2223)
     at treeTableVersion2.TreeTable.updateValuesSingleDateSingleArea(TreeTable.java:393)
     at treeTableVersion2.TestWindow.actionPerformed(TestWindow.java:394)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1849)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2169)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:234)
     at java.awt.Component.processMouseEvent(Component.java:5488)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3126)
     at java.awt.Component.processEvent(Component.java:5253)
     at java.awt.Container.processEvent(Container.java:1966)
     at java.awt.Component.dispatchEventImpl(Component.java:3955)
     at java.awt.Container.dispatchEventImpl(Container.java:2024)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4212)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3892)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3822)
     at java.awt.Container.dispatchEventImpl(Container.java:2010)
     at java.awt.Window.dispatchEventImpl(Window.java:1774)
     at java.awt.Component.dispatchEvent(Component.java:3803)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:463)
     at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)Although I think a lot of that is because the process is called by a button press.
The sql statement thats causing the problem is:
select h.areaname,
       e.code,
       e.descript,
       ec.date_raised,
       ec.date_progressing,
       ec.date_completed
from hareas h, evt_type e, evt_core ec
where h.areaname = ?
   and e.evt_type_id = ec.evt_type_id
   and (h.nblink = ec.area1_nblink or h.nblink = ec.area2_nblink)
   and ec.date_raised = ?
group by h.areaname,
          e.code,
          e.descript,
          ec.date_raised,
          ec.date_progressing,
          ec.date_completed
order by h.areanameThanks for your help

Problem in calling oracle procedure from java

Oracle procedure with the following parameters.
CREATE OR REPLACE PROCEDURE CREDITED_TO_STORE_INSERT (P_CUST# IN NUMBER,
P_INV_DATE IN DATE,
P_MEMO# IN NUMBER,
P_SESS_ID IN VARCHAR2 ) IS
BEGIN
/*.........Procedure Body with select and insert statements there no OUT or return variable/value......*/
END;
Now i am calling this procedure with the java code in java.
public boolean execProcedure(String storeNo, String invoiceDate, String claimNo, String sessionID) throws SQLException {
     CallableStatement cstmt = null;
     java.sql.Date invicDate = this.StringToDate(invoiceDate);
     try
     cstmt = conn.prepareCall("{call WEBUSER.CREDITED_TO_STORE_INSERT(?,?,?,?,?,?)}");
     cstmt.setInt(1, Integer.parseInt(storeNo));
     cstmt.setDate(2, invicDate);
     cstmt.setInt(3, Integer.parseInt(claimNo));
     cstmt.setString(4, sessionID);
     cstmt.execute();
     catch (Exception e)
     System.out.println (e);
     } // catch (Exception e)
     finally
     try
     cstmt.close();
     catch (Exception ex)
     } // catch (Exception ex)
     } // finally
     return true;
But it will return the following exception.
[STDOUT] java.sql.SQLException: Missing IN or OUT parameter at index:: 5
i don't know why :( please help me ...

your procedure has 4 parameters but in the prepared statement you define 6 placeholders

SELECT-INTO prepared statement?

Hi,
I have a single-row select to execute. I don't know if the multi-row select functionality (ResultSets, etc.) should be used for a single-select.
Here's from the Oracle JDBC Documentation on a prepared statement with input variables:
PreparedStatement pstmt =
conn.prepareStatement ("insert into EMP (EMPNO, ENAME) values (?, ?)");
pstmt.setInt (1, 1500); // The first ? is for EMPNO
pstmt.setString (2, "LESLIE"); // The second ? is for ENAME
pstmt.execute ();
What I would like to do is have a PreparedStatement for output variables in a SELECT-INTO:
pstmt= conn.prepareStatement("select max(sal) into ? from emp;");
but there appears to be no bind variable functionality.
Callable statements apparently are only for stored procedures.
Basically, should I just use the multirow select for this?
Thanks,
Glen

pstmt= conn.prepareStatement("select max(sal) into ?
from emp;");
but there appears to be no bind variable
functionality.You might be able to bind this as an output parameter, but it seems like extra work (just getting a ResultSet for "select max(sal) from emp" would be a lot more straight forward).
>
Callable statements apparently are only for stored
procedures.Not really, I execute PL/SQL blocks using prepared statements all the time. Sometimes it's the only way to get the data into a format that JDBC can handle.
Here's an example:
    /** This is the SQL used to call the API ... */
    public static final String spSQL =
    "declare " +
        "t_warranty_tbl apps.cib_devo_wrapper.wartbltyp; " +
        "x_warranty_tbl apps.cib_devo_wartbltyp; " +
        "x_return_text VARCHAR2(2000); " +
    "begin " +
        "apps.cib_devo_wrapper.cib_get_warranty_info(" +
            "P_SERIAL_NUMBER => ?,"
            "X_WARRANTY_TBL => t_warranty_tbl," +
            "X_RETURN_TEXT => x_return_text," +
            "x_row_count => ?); " +
        // Convert to a table of objects ...
        "x_warranty_tbl := apps.cib_devo_wrapper.cib_warranty_casttowartbltyp(t_warranty_tbl); " +
        // Get the cursor with order by ...
        "OPEN ? FOR SELECT * FROM TABLE(CAST(x_warranty_tbl AS apps.CIB_DEVO_WarTblTyp)) tbl " +
            "WHERE tbl.entitlementReturnCode != apps.cib_devo_wrapper.g_ent_ret_code_08 " +
            "ORDER BY tbl.INSTALLEDAT_CUSTOMER_NAME, tbl.SITE_NAME, tbl.SITE_ID, " +
                      "tbl.PRODUCT_FAMILY, tbl.PRODUCT_NAME, tbl.SERIAL_NUMBER; " +
       "?:=x_return_text; " +
    "end;";In this example, I declare a few variables, call a stored procedure,
do some more PL/SQL to reduce the results before I finally bring them back.
The first placeholder (question mark) is the input serial number, the second one is an output parameter that gives the row count. The third
question mark is the cursor that contains the data I need, and the fourth is a reference to a status message.
As you can see, the PL/SQL isn't exclusively stored procedure calls.
>
Basically, should I just use the multirow select for
this?I think you'd need code that looks something like:
DECLARE
myCount NUMBER;
BEGIN
select max(sal) into myCount
from emp;
? := myCount
END;Although wrapping the select in a BEGIN..END block may be enough.

Running explain plan on a prepared statement

I'm using IBatis to run queries against an Oracle database. IBatis runs the queries as prepared statements. I want to run explain plan on the prepared statements.
I already have a shim -- a proxy java.sql.Connection object -- that takes the SQL used to create a prepared statement (e.g., "select a, b, c from table d where c = ?"), returns a proxy java.sql.PreparedStatement, and then on the PreparedStatement's execute(), interpolates the bound parameters into the SQL statement, and runs Explain Plan on that (e.g, preparedStatement.setInt(5) is called, followed by preparedStatement.execute(), which results in my proxy running "explain plan for select a, b, c from table d where c = 5;")
Using Spring configuration, I can transparently insert the shim and get explain plans for all queries run through that Connection.
The problem is this: I'm explaining the plan for the SQL with the bound parameters, not necessarily the SQL run for the prepared statement.
Assume that in the above example, there exists an index on column c in table d, and that 5% of d's rows have the value 1, 15% have the value 2, and 80% have the value 3.
For "select a, b, c from table d where c = 1", Oracle will use the index. But for "select a, b, c from table d where c = 3", Oracle will do a full table scan.
What I want to know is what Oracle will do for "select a, b, c from table d where c = ?" when "?" is an unknown, arbitrary value subsequently bound to 1 or to 3.
As I understand it, the query plan for a prepared statement is done once, when the prepared statement is created. At execute time (as I understand it), the query plan is not reformulated based on the actual bound values (though partition pruning is recalculated).
So how can I find out what query plan is actually be used for prepred statement?
Thanks.

I already have a shim -- a proxy java.sql.Connection object -- that takes the SQL used to create a prepared statement I believe explain plan is part of PL/SQL rather than external to it.
As such you can pass it via a prepared statement. It is just a matter of getting the syntax correct. And of course collecting the result.
The syntax is going to be be something like the following. You would use it just like you use the existing sql.
begin
select ... from ... where c = ?;
endThe result might be returned a result sets (plural). If so you would need to code appropriately for that.

Prepared Statement nested calls (Oracle)

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