Combo box with bind variable from popup

Hi.
I had two comboboxes on a form, one having a bind variable. It works great, with the first one as bind field.
But i want to have the first LOV to be a POPUP. So, the second LOV (combo box) needs to be refreshed when a user has picked a value from the popup list. When i do that, the second LOV is not refresehed...
Is there a way to do this?
(3.0.9.8.3.A)

Hi,
This was a bug and is fixed in 30984.
Thanks,
Sharmila

Similar Messages

Combo box with multiple variables pre populating multiple fields and max value validation script help

I am creating a pdf form that will be used as a calculator, and my javascript knowledge is pretty rudimentary. I can do the simple things, some of what I need to do is over my head.
1. I believe I need to use a combo box to pre populate certain fields. I have 13 variables in the dropdown to choose from, and whatever the client chooses will pre populate three other fields (and each of the 13 variables will populate those three fields differently). I'm not exactly sure how to go about doing this. Is it custom keystroke script or does it require a document script? Also, I'm guessing that whatever script will be a series of if/then statements, correct?
2. Once all the fields have been populated (be it pre population or filled in by the customer), I need to calculate the answer which is not my main problem—I already have the proper calculations in place and they work. The problem is that the answer has a maximum value even if the actual value goes over that max number. So, the actual answer is 14 but the max value can only be 12. How do I get the calculation to replace that actual number (14) with the max number (12)? Is that in the validation tab or should that go elsewhere?
I feel like I know just enough to be dangerous but not terribly effective. Any help is appreciated.
Thanks!

1. There is a tutorial on this here:
http://acrobatusers.com/tutorials/change_another_field
2. To set the maximum value to 12, try this as the custom calculation script for the field:
//Custom calculation script
//Get value of text field
var a = this.getField("Text1").value;
//If it is > 12, then make it 12
if (a > 12){
a=12
event.value = a
You need to replace "Text1" with the name of the field in your form.

Exit with bind variable from sqlplus and then echo $?

Hello world.
I don't know why they are different between :v_num and the value of "echo $?"
thanks.
SANOWT:oratest:/data3/oratest/oratest/hgjung> cat t.sql
select count(*) from all_objects;
variable v_num number;
begin
select count(*) into :v_num from all_objects ;
exception
when no_data_found then
:v_num := 1403;
end;
exit *:v_num*
SANOWT:oratest:/data3/oratest/oratest/hgjung> \sqlplus scott/***** @t
SQL*Plus: Release 10.2.0.3.0 - Production on Wed Feb 17 10:11:59 2010
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
COUNT(*)
*50497*
PL/SQL procedure successfully completed.
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
SANOWT:oratest:/data3/oratest/oratest/hgjung> echo $?
*65*
SANOWT:oratest:/data3/oratest/oratest/hgjung>

The $? variable in UNIX is the exit code for the program. In most *NIX versions that I am aware of, it is limited to values between 0 and 255 (i.e. one byte), so the value is truncated. The hex value of 50497 is C541, or two bytes, so the $? variable is only getting the last byte 0X41 which is decimal 65.
John

Report Performance with Bind Variable

Getting some very odd behaviour with a report in APEX v 3.2.1.00.10
I have a complex query that takes 5 seconds to return via TOAD, but takes from 5 to 10 minutes in an APEX report.
I've narrowed it down to one particular bind. If I hard code the date in it returns in 6 seconds, but if I let the date be passed in from a parameter it takes 5+ minutes again.
Relevant part of the query (an inline view) is:
,(select rglr_lect lect
,sum(tpm) mtr_tpm
,sum(enrols) mtr_enrols
from ops_dash_meetings_report
where meet_ev_date between to_date(:P35_END_DATE,'DD/MM/YYYY') - 363 and to_date(:P35_END_DATE,'DD/MM/YYYY')
group by rglr_lect) RPV
I've tried replacing the "to_date(:P35_END_DATE,'DD/MM/YYYY') - 363" with another item which is populated with the date required (and verified by checking session state). If I replace the :P35_END_DATE with an actual date the performance is fine again.
The weird thing is that a trace file shows me exactly the same Explain Plan as the TOAD Explain where it runs in 5 seconds.
Another odd thing is that another page in my application has the same inline view and doesn't hit the performance problem.
The trace file did show some control characters (circumflex M) after each line of this report's query where these weren't anywhere else on the trace queries. I wondered if there was some sort of corruption in the source?
No problems due to pagination as the result set is only 31 records and all being displayed.
Really stumped here. Any advice or pointers would be most welcome.
Jon.

Don't worry about the Time column, the cost and cardinality are more important to see whther the CBO is making different decisions for whatever reason.
Remember that the explain plan shows the expected execution plan and a trace shows the actual execution plan. So what you want to do is compare the query with bind variables from an APEX page trace to a trace from TOAD (or sqlplus or whatever). You can do this outside APEX like this...
ALTER SESSION SET EVENTS '10046 trace name context forever, level 1';Enter and run your SQL statement...;
ALTER SESSION SET sql_trace=FALSE;This will create a a trace file in the directory returned by...
SELECT value FROM v$parameter WHERE name = 'user_dump_dest' Which you can use tkprof to format.
I am assuming that your not going over DB links or anything else slightly unusual?
Cheers
Ben

How I can stop the combo box with list of values from fireing validations

Hi I'm using Jdeveloper 11.1.2.3.0
Using Hr Schema employees table
I Display employees data in af:table
and I make List Of values on Department_id filed to easy change the employee department
and another one on Job_id filed
and Imake them UI Hints as ( combo box with list of values ) in the employeesVO
the problem is when I Select a value from department or jobs ( combo box with list of values )
fires the entire filed validations for mandatory atributes
Note : the af:table Property ( contedelivery) is set to (immediate )
How I can stop the combo box with list of values from fireing validations

check it out.,
http://andrejusb.blogspot.in/2012/09/what-to-do-when-adf-editable-table.html

Create collection from query with bind variable

Apex 4.0.2
Per Joel Re: Collection with bind variable the apex_collection.create_collection_from_query_b supports queries containing bind variable references (:P1_X) but I am not sure how to use this feature, the documentation doesn't have an example, just the API signature for the overloaded version has changed.
If the query contains 2 bind variable references to session state (:P1_X and :P1_Y), can someone please show an example of what to pass in for the p_names and p_values parameters to the API?
Thanks
procedure create_collection_from_query_b(
    -- Create a named collection from the supplied query using bulk operations. The query will
    -- be parsed as the application owner. If a collection exists with the same name for the current
    -- user in the same session for the current Flow ID, an application error will be raised.
    -- This procedure uses bulk dynamic SQL to perform the fetch and insert operations into the named
    -- collection. Two limitations are imposed by this procedure:
    --   1) The MD5 checksum for the member data will not be computed
    --   2) No column value in query p_query can exceed 2,000 bytes
    -- Arguments:
    --     p_collection_name   = Name of collection. Maximum length can be
    --                            255 bytes. Note that collection_names are case-insensitive,
    --                            as the collection name will be converted to upper case
    --     p_query             = Query to be executed which will populate the members of the
    --                            collection. If p_query is numeric, it is assumed to be
    --                            a DBMS_SQL cursor.
    -- example(s):
    --     l_query := 'select make, model, caliber from firearms';
    --     apex_collection.create_collection_from_query_b( p_collection_name => 'Firearm', p_query => l_query );
    p_collection_name in varchar2,
    p_query           in varchar2,
    p_names           in wwv_flow_global.vc_arr2,
    p_values          in wwv_flow_global.vc_arr2,
    p_max_row_count   in number default null)
    ;

VANJ wrote:
Apex 4.0.2
Per Joel Re: Collection with bind variable the apex_collection.create_collection_from_query_b supports queries containing bind variable references (:P1_X) but I am not sure how to use this feature, the documentation doesn't have an example, just the API signature for the overloaded version has changed.
If the query contains 2 bind variable references to session state (:P1_X and :P1_Y), can someone please show an example of what to pass in for the p_names and p_values parameters to the API?Not tried it, but guessing something like
apex_collection.create_collection_from_query_b(
    p_collection_name => 'foobar'
, p_query => 'select f.foo_id, b.bar_id, b.baz from foo f, bar b where f.foo_id = b.foo_id and f.x = to_number(:p1_x) and b.y = :p1_y'
, p_names => apex_util.string_to_table('p1_x:p1_y')
, p_values => apex_util.string_to_table(v('p1_x') || ':' || v('p1_y')))

Problem with Bind Variable in 11.2

Hi
I have a slow statement with bind Variables. With literals it works fine. Is there a way to replace the bind by literal in advanced ? I use Release 11.2.0.2.3
Thank you

904062 wrote:
I have a slow statement with bind Variables. With literals it works fine. Is there a way to replace the bind by literal in advanced ? I use Release 11.2.0.2.3This specific scenario is very much an exception to the rule - and you need to back your statement up with execution plans of the SQL with bind variables and with literals, and run stats that show the difference between these two execution plans.
See the {message:id=9360003} from the {forum:id=75} forum's FAQ for details on how to post a SQL performance tuning question.

Query with bind variable, how can use it in managed bean ?

Hi
I create query with bind variable (BindControlTextValue), this query return description of value that i set in BindControlTextValue variable, how can i use this query in managed bean? I need to set this value in String parameter in managed bean.
Thanks

Put the query in a VO and execute it the usual way.
If you need to, you can write a parameterized method in VOImpl that executes the VO query with the parameter and then call that method from the UI (as a methodAction binding) either through the managed bean or via a direct button click on the page.

SLOW report performance with bind variable

Environment: 11.1.0.7.2, Apex 4.01.
I've got a simplified report page where the report runs slowly compared to running the same query in sqldeveloper. The report region is based on a pl/sql function returning a query. If I use a bind variable in the query inside apex it takes 13 seconds to run, and if I hard code a string it takes only a few hundredths of a second. The query returns one row from a table which has 1.6 million rows. Statistics are up-to-date and the columns in the joins and where clause are indexed.
I've run traces using p_trace=YES from Apex for both the bind variable and hard coded strings. They are below.
The sqldeveloper explain plan is identical to the bind variable plan from the trace, yet the query runs in 0.0x seconds in sqldeveloper.
What is it about bind variable syntax in Apex that is causing the bad execution plan? Apex Bug? 11g bug? Ideas?
tkprof output from Apex trace with bind variable is below...
select p.master_id link, p.first_name||' '||p.middle_name||' '||p.last_name||' '||p.suffix personname,
p.gender||' '||p.date_of_birth g_dob, p.master_id||'*****'||substr(p.ssn,-4) ssn, p.status status
from persons p
where
   p.person_id in (select ps.person_id from person_systems ps where ps.source_key like LTRIM(RTRIM(:P71_SEARCH_SOURCE1)))
order by 1
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.00       0.00          0          0          0           0
Execute      1      0.00       0.01          0          1         27           0
Fetch        2     13.15      13.22      67694      72865          0           1
total        4     13.15      13.23      67694      72866         27           1
Misses in library cache during parse: 0
Optimizer mode: ALL_ROWS
Parsing user id: 62 (ODPS_PRIVACYVAULT)   (recursive depth: 1)
Rows     Row Source Operation
      1 SORT ORDER BY (cr=72869 pr=67694 pw=0 time=0 us cost=29615 size=14255040 card=178188)
      1   FILTER (cr=72869 pr=67694 pw=0 time=0 us)
      1    HASH JOIN RIGHT SEMI (cr=72865 pr=67694 pw=0 time=0 us cost=26308 size=14255040 card=178188)
      1     INDEX FAST FULL SCAN IDX$$_0A300001 (cr=18545 pr=13379 pw=0 time=0 us cost=4993 size=2937776 card=183611)(object id 68485)
1696485     TABLE ACCESS FULL PERSONS (cr=54320 pr=54315 pw=0 time=21965 us cost=14958 size=108575040 card=1696485)
Rows     Execution Plan
      0 SELECT STATEMENT   MODE: ALL_ROWS
      1   SORT (ORDER BY)
      1    FILTER
      1     HASH JOIN (RIGHT SEMI)
      1      INDEX   MODE: ANALYZED (FAST FULL SCAN) OF
                 'IDX$$_0A300001' (INDEX)
1696485      TABLE ACCESS   MODE: ANALYZED (FULL) OF 'PERSONS' (TABLE)
Elapsed times include waiting on following events:
Event waited on                             Times   Max. Wait Total Waited
----------------------------------------   Waited ---------- ------------
db file scattered read                       1276        0.00          0.16
db file sequential read                       812        0.00          0.02
direct path read                             1552        0.00          0.61
********************************************************************************Here's the tkprof output with a hard coded string:
select p.master_id link, p.first_name||' '||p.middle_name||' '||p.last_name||' '||p.suffix personname,
p.gender||' '||p.date_of_birth g_dob, p.master_id||'*****'||substr(p.ssn,-4) ssn, p.status status
from persons p
where
   p.person_id in (select ps.person_id from person_systems ps where ps.source_key like LTRIM(RTRIM('0b')))
order by 1
call     count       cpu    elapsed       disk      query    current        rows
Parse        1      0.02       0.04          0          0          0           0
Execute      1      0.00       0.00          0          0         13           0
Fetch        2      0.00       0.00          0          8          0           1
total        4      0.02       0.04          0          8         13           1
Misses in library cache during parse: 1
Optimizer mode: ALL_ROWS
Parsing user id: 62 (ODPS_PRIVACYVAULT)   (recursive depth: 1)
Rows     Row Source Operation
      1 SORT ORDER BY (cr=10 pr=0 pw=0 time=0 us cost=9 size=80 card=1)
      1   FILTER (cr=10 pr=0 pw=0 time=0 us)
      1    NESTED LOOPS (cr=8 pr=0 pw=0 time=0 us)
      1     NESTED LOOPS (cr=7 pr=0 pw=0 time=0 us cost=8 size=80 card=1)
      1      SORT UNIQUE (cr=4 pr=0 pw=0 time=0 us cost=5 size=16 card=1)
      1       TABLE ACCESS BY INDEX ROWID PERSON_SYSTEMS (cr=4 pr=0 pw=0 time=0 us cost=5 size=16 card=1)
      1        INDEX RANGE SCAN IDX_PERSON_SYSTEMS_SOURCE_KEY (cr=3 pr=0 pw=0 time=0 us cost=3 size=0 card=1)(object id 68561)
      1      INDEX UNIQUE SCAN PK_PERSONS (cr=3 pr=0 pw=0 time=0 us cost=1 size=0 card=1)(object id 68506)
      1     TABLE ACCESS BY INDEX ROWID PERSONS (cr=1 pr=0 pw=0 time=0 us cost=2 size=64 card=1)
Rows     Execution Plan
      0 SELECT STATEMENT   MODE: ALL_ROWS
      1   SORT (ORDER BY)
      1    FILTER
      1     NESTED LOOPS
      1      NESTED LOOPS
      1       SORT (UNIQUE)
      1        TABLE ACCESS   MODE: ANALYZED (BY INDEX ROWID) OF
                   'PERSON_SYSTEMS' (TABLE)
      1         INDEX   MODE: ANALYZED (RANGE SCAN) OF
                    'IDX_PERSON_SYSTEMS_SOURCE_KEY' (INDEX)
      1       INDEX   MODE: ANALYZED (UNIQUE SCAN) OF 'PK_PERSONS'
                  (INDEX (UNIQUE))
      1      TABLE ACCESS   MODE: ANALYZED (BY INDEX ROWID) OF
                 'PERSONS' (TABLE)

Patrick, interesting insight. Thank you.
The optimizer must be peeking at my bind variables with it's eyes closed. I'm the only one testing and I've never passed %anything as a bind value. :)
Here's what I've learned since my last post:
I don't think that sqldeveloper is actually using the explain plan it says it is. When I run explain plan in sqldeveloper (with a bind variable) it shows me the exact same plan as Apex with a bind variable. However, when I run autotrace in sqldeveloper, it takes a path that matches the hard coded values, and returns results in half a second. That autotrace run is consistent with actually running the query outside of autotrace. So, I think either sqldeveloper isn't really using bind variables, OR it is using them in some other way that Apex does not, or maybe optimizer peeking works in sqldeveloper?
Using optimizer hints to tweak the plan helps. I've tried both /*+ FIRST_ROWS */ and /*+ index(ps pk_persons) */ and both drop the query to about a second. However, I'm loath to use hints because of the very dynamic nature of the query (and Tom Kyte doesn't like them either). The hints may end up hurting other variations on the query.
I also tested the query by wrapping it in a select count(1) from ([long query]) and testing the performance in sqldeveloper and in Apex. The performance in that case is identical with both bind variables and hard coded variables for both Apex and SqlDeveloper. That to me was very interesting and I went so far as to set up two bind variable report regions on the same page. One region wrapped the long query with select count(1) from (...) and the other didn't. The wrapped query ran in 0.01 seconds, the unwrapped took 15ish seconds with no other optimizations. Very strange.
To get performance up to acceptable levels I have changed my function returning query to:
1) Set the equality operator to "=" for values without wildcards and "like" for user input with wildcards. This makes a HUGE difference IF no wildcard is used.
2) Insert a /*+ FIRST_ROWS */ hint when users chose the column that requires the sub-query. This obviously changes the optimizer's plan and improves query speed from 15 seconds to 1.5 seconds even with wildcards.
I will NOT be hard coding any user supplied values in the query string. As you can probably tell by the query, this is an application where sql injection would be very bad.
Jeff, regarding your question about "like '%' || :P71_SEARCH_SOURCE1 || '%'". I've found that putting wildcards around values, particularly at the beginning will negate any indexing on the column in question and slows performance even more.
I'm still left wondering if there isn't something in Apex that is breaking the optimizer "peeking" that Patrick describes. Perhaps something in the way it switches contexts from apex_public_user to the workspace schema?

LOV(af:selectOneChoice) with bind variable in af:table

Hi All,
I have a table where a column is defined as dropdown(af:selectOneChoice). The query for selectOneChoice has a bind variable which needs to be set as a value from the base view Object corresponding row.
Suppose a table Employee
EmpId EmpName EmpType Authorization
101 John Temp No
The above table is created as af:table and 'Authorization' is implemented as dropdown(af:selectOneChoice) . The selectOneChoice has a query(AuthorizationLovVVO) with bind variable . For each row of af:table(EmployeeVO) , af:selectOneChoice query(AuthorizationLovVVO) requires
the corresponding row(EmployeeVO) 'EmpType' to be set as value of bind variable.
Can you please suggest how can we achieve this functionality.
Edited by: 907302 on Oct 17, 2012 7:22 AM
Edited by: 907302 on Oct 17, 2012 7:22 AM

I have checked the following post where it has been suggested to access the the current row value as groovy expression.
groovy for bind variable
Suppose my AM name is 'TestAM' , i have tried the below expressions for value of bind variable but it does not work :
1) adf.object.TestAM.findViewObject('EmployeeVO1').currentRow.EmpType
2) adf.object.TestAMDataControl.findViewObject('EmployeeVO1').currentRow.EmpType
None of the above expressions work and i get the error while running the page as 'Variable NotesAM is not recognized.' / 'Variable NotesAMDataControl is not recognized.' .
Can you please suggest if we can achieve the functionality using this approach . Also let me know if i am missing something in the above expression.

How to querie with bind variable in findMode?

Hallo,
is it possible to use a querie with bind variable in findMode? And when how is it possible to initialize the bind variable?
Any help is appreciated.

Hi,
bind variables can be linked from teh ADF binding to e.g. a managed bean, the sessionScope or other binding attributes via EL. So when you go into findMode and execute the query, the EL will grab the bindVariable values automatically.
Frank

SQL query with Bind variable with slower execution plan

I have a 'normal' sql select-insert statement (not using bind variable) and it yields the following execution plan:-
Execution Plan
0 INSERT STATEMENT Optimizer=CHOOSE (Cost=7 Card=1 Bytes=148)
1 0 HASH JOIN (Cost=7 Card=1 Bytes=148)
2 1 TABLE ACCESS (BY INDEX ROWID) OF 'TABLEA' (Cost=4 Card=1 Bytes=100)
3 2 INDEX (RANGE SCAN) OF 'TABLEA_IDX_2' (NON-UNIQUE) (Cost=3 Card=1)
4 1 INDEX (FAST FULL SCAN) OF 'TABLEB_IDX_003' (NON-UNIQUE)
(Cost=2 Card=135 Bytes=6480)
Statistics
0 recursive calls
18 db block gets
15558 consistent gets
47 physical reads
9896 redo size
423 bytes sent via SQL*Net to client
1095 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
55 rows processed
I have the same query but instead running using bind variable (I test it with both oracle form and SQL*plus), it takes considerably longer with a different execution plan:-
Execution Plan
0 INSERT STATEMENT Optimizer=CHOOSE (Cost=407 Card=1 Bytes=148)
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'TABLEA' (Cost=3 Card=1 Bytes=100)
2 1 NESTED LOOPS (Cost=407 Card=1 Bytes=148)
3 2 INDEX (FAST FULL SCAN) OF TABLEB_IDX_003' (NON-UNIQUE) (Cost=2 Card=135 Bytes=6480)
4 2 INDEX (RANGE SCAN) OF 'TABLEA_IDX_2' (NON-UNIQUE) (Cost=2 Card=1)
Statistics
0 recursive calls
12 db block gets
3003199 consistent gets
54 physical reads
9448 redo size
423 bytes sent via SQL*Net to client
1258 bytes received via SQL*Net from client
3 SQL*Net roundtrips to/from client
1 sorts (memory)
0 sorts (disk)
55 rows processed
TABLEA has around 3million record while TABLEB has 300 records. Is there anyway I can improve the speed of the sql query with bind variable? I have DBA Access to the database
Regards
Ivan

Many thanks for your reply.
I have run the statistic already for the both tableA and tableB as well all the indexes associated with both table (using dbms_stats, I am on 9i db ) but not the indexed columns.
for table I use:-
begin
dbms_stats.gather_table_stats(ownname=> 'IVAN', tabname=> 'TABLEA', partname=> NULL);
end;
for index I use:-
begin
dbms_stats.gather_index_stats(ownname=> 'IVAN', indname=> 'TABLEB_IDX_003', partname=> NULL);
end;
Is it possible to show me a sample of how to collect statisc for INDEX columns stats?
regards
Ivan

BC4J bug with "bind variables" JBO-27122 ORA-01008

I think we are found a BUG using BC4J with bind variables in a view object.
If the bind variable appear in the WHERE condition two or more times at
the beginning of the query the above error occur.
oracle.jbo.SQLStmtException: JBO-27122: SQL error during statement preparation. Statement:
SELECT Emp.EMPNO,Emp.ENAME,Emp.JOB,Emp.MGR,Emp.HIREDATE,Emp.SAL,Emp.COMM, Emp.DEPTNO
FROM SCOTT.EMP Emp
WHERE :1 <=10000 and :1 <= sal and :2=20
java.sql.SQLException: ORA-01008: not all variables bound
Otherwise if bind variable apper two or more times, but not together
like this sample:
WHERE :1 <=10000 and :2=20 and :1 <= sal
the error not occur.
We prove this with:
JDeveloper 9.0.5.2 (build 1618)Business Components Version 9.0.5.16.0
JDeveloper 9.0.5.0 (build 1375)Business Components Version 9.0.5.13.52
I looking for a patch! or acceptable workaround.
Tx for your help!
diego.
/* the cliente app */
ApplicationModule am = Configuration.createRootApplicationModule("business_tier.AppModule","AppModuleLocal");
ViewObject vo = am.findViewObject("EmpView");
vo.setWhereClauseParam(0,"100");
vo.setWhereClauseParam(1,"20");
Row emp = vo.first();

This is a known bug (1326006). The workaround is to use:
vo.setWhereClauseParam(0,"100");
vo.setWhereClauseParam(1,"20");
vo.setWhereClauseParam(2,"20");
Hope this helps,
Lynn
Java Tools Team

Combo Box with duplicate data

Hello All,
I am creating a form with a combo box but the data from the table is duplicating. Can anyone provide guidance on how to make the combo box only display only two choices of the data? For example, when the box is selected the drop down list
will have multiple/group of 'Yes' and 'No'. It appears that everytime a record is added to the table, it gets duplicated. I think I'm overlooking something from working long on this and it maybe something simple/obvious. Any
help would be appreciated, thanks.
Evin

As Bruce said you can use the DISTINCT predicate to suppress duplicate rows, but if you are getting duplicates in a combo box's list it suggests that you are querying the wrong table as the Control's RowSource property. If we take a simple example
of a combo box to list states, then the following would return duplicates of the table contains rows for two or more cities in the same state:
SELECT State
FROM Cities
ORDER BY State;
You could suppress the duplicates with:
SELECT DISTINCT State
FROM Cities
ORDER BY State;
but the correct solution would be:
SELECT State
FROM States
ORDER BY State;
i.e. in the Cities table State is a foreign key column referencing the primary key of States. You might ask why have a States table at all as the values are already in Cities? The answer is that by having a States table you can enforce referential
integrity in the relationship between Cities and States, preventing the insertion of invalid State values into Cities. Without protecting the integrity of the database in this way errors in data entry will sooner or later occur (Murphy's Law is infallible
in this respect!). I have personal experience which is testament to this, having once found three versions of my own name as author in a table of references to technical articles in my own field of work. As far as the database is concerned this
makes me three separate people! The table should have referenced the key of an Authors table of course.
Ken Sheridan, Stafford, England

Help with bind variables

Hello I'm new to .net and I'm trying to work with bind variables
I keep getting the ORA-01036: illegal variable name/number error.
here's my code, can somebody help me out and show me what am I doing wrong?
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim drLocation As OracleDataReader = getSCLocation("SOMEBODY")
End Sub
Private Function getSCLocation(ByVal contactName As String) As OracleDataReader
Dim drLocation As OracleDataReader
Dim connString As String = ConfigurationManager.ConnectionStrings("scConnString").ConnectionString
Dim conn As New OracleConnection(connString)
conn.Open()
Dim queryString As String = "select a.location, a.location_name from locationm1 a where a.primary_contact_dept in (select b.dept from contactsm1 b where b.contact_name = p_contactName)"
Dim p_contactName As New OracleParameter
p_contactName.OracleType = OracleType.VarChar
p_contactName.Value = contactName
Dim cmdLocation As New OracleCommand(queryString, conn)
cmdLocation.Parameters.Add(p_contactName)
drLocation = cmdLocation.ExecuteReader(CommandBehavior.CloseConnection)
Return drLocation
End Function
Thanks
Peter

never mind i got it by playing around with it
had to change the way to start the bind variable
Dim p_contactName As New OracleParameter("p_contactName", OracleType.VarChar)
p_contactName.Size = 140
p_contactName.Value = contactName

Combo box with bind variable from popup

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