How to dynamically build where clause in Linq

Hello everyone,
Oracle DB:11gR2
Oracle Client: 11.2.0.3.0 (ODP.NET)
Oracle Developer Tools for Visual Studio
VS 2010 (C#)
In a Windows Form, we need to query the data based on the values of dropdown listboxes, which user will select.
Let's say, two combox, one is for Department and one is for Salary
Department:
-1 All
10 Department 1
20 Department 2
30 Department 3
Salary:
-1 All
1 < 20000
2 20000 to 50000
3 50000 to 100000
4 > 100000
Here is C# code to query data:
using (var myEDMctx = new HREntities())
var LINQrslt = from emp in myEDMctx.EMPLOYEES
select emp;
The default values for both combox should be All.
How to write the dynamic where clause for this LINQ?
Thanks in advance!!!

There is nothing Oracle-specific about dynamic LINQ queries. Dynamic LINQ queries are handled all the same way, no matter which data source you use. Microsoft describes how to use Dynamic LINQ here:
http://weblogs.asp.net/scottgu/archive/2008/01/07/dynamic-linq-part-1-using-the-linq-dynamic-query-library.aspx
http://weblogs.asp.net/davidfowler/archive/2010/08/19/dynamic-linq-part-2-evolution.aspx

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Dynamic XQuery Where clause

I have the following schema:
<?xml version="1.0"?>
<xs:schema
xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:tns="CountryRiskService"
targetNamespace="CountryRiskService"
elementFormDefault="qualified"
attributeFormDefault="unqualified">
<xs:element name="CountryRiskParameters">
<xs:complexType>
<xs:sequence>
<xs:element name="countryId" type="xs:int" minOccurs="1" maxOccurs="unbounded"/>
<xs:element name="catA" type="xs:boolean" minOccurs="0" maxOccurs="1"/>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>
I am passing this into my Logical Data Service, what I want to do is create a dynamic XQuery where clause if the catA field is populated, ignore it if it isn’t, so basically, I want to be able to create a dynamic query based on the parameters requested, so I have the following XQUERY:
declare function tns:getCountries($countryRiskInput as element(ns7:CountryRiskParameters)) as element(ns0:CountryRiskInfo)* {
for $tbl_high_risk_countries in ns1:tbl_high_risk_countries()
where $countryRiskInput/ns4:countryId = $tbl_high_risk_countries/country_id
where $countryRiskInput/ns4:catA = $tbl_high_risk_countries/risk_catA
I really thought that DSP would be able to handle this on the fly since the element is optional but if I don’t populate it, I get nothing back, the idea is I want to increase the number of elements in my schema so my consumers have the ability to filter the results they want, so above, I don’t want the second where clause if catA isn't specified, any ideas how to accomplish this?

Simply add the disjunction of the input being empty.
for $tbl_high_risk_countries in ns1:tbl_high_risk_countries()
where $countryRiskInput/ns4:countryId = $tbl_high_risk_countries/country_id
where ( $countryRiskInput/ns4:catA = $tbl_high_risk_countries/risk_catA or empty( $countryRiskInput/ns4:catA )
But suppose you have 27 different elements that you might want to filter on - the xquery gets long and ugly. You might want to looking into using FilterXQuery. Visit http://edocs.bea.com/aldsp/docs25/, search on FilterXQuery, look for the tutorial.
If your queries get more complicated, you would do well to look into generating ad hoc queries. (edocs as well).

Need help in clearing string buffer during dynamic VO where clause in oaf

Hi All,
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Thnaks

Hi,
Could you please share the code segment for reference. Then we can tell the solution.
Regards,
Tarun

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Hi
I looking for example of FM for Virtual provider where I find code how assign to select statement "where" clause value from query variable.
In following code how build t_r_custtype range and how assign value to it.
CODE********************************
TYPE-POOLS: abap.
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CLEAR: e_t_data, e_t_msg.
this is specific to infoprovider VIRTPROV
CHECK i_infoprov = 'VIRTPROV'.
FIELD-SYMBOLS: <l_s_sbook> TYPE sbook,
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initialize
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Data selection / only Business Customer
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Hello,
Would you like fill the ranges in Customer exit for BEx..?
If Yes. please refer the attachment for the whole code...
"Sample code in Customer Exit in BEx"
IF i_step = 2.
CASE i_vnam.
WHEN 'ZDAY_CX'.
LOOP AT i_t_var_range INTO loc_var_range WHERE vnam = 'ZDAY_IN'.
CLEAR: l_s_range.
ZT_DT1 = loc_var_range-low.
ZT_DT2 = loc_var_range-HIGH.
CALL FUNCTION 'DATE_CREATE'
EXPORTING
ANZAHL_JAHRE = 0
ANZAHL_KALTAGE = 0
ANZAHL_MONATE = '-1'
ANZAHL_TAGE = 0
DATUM_EIN = ZT_DT1
DATUM_EIN_ULT = ' '
ULTIMO_SETZEN = ' '
IMPORTING
DATUM_AUS = ZFIDAY .
E_TT =
E_ULTKZ =
CALL FUNCTION 'DATE_CREATE'
EXPORTING
ANZAHL_JAHRE = 0
ANZAHL_KALTAGE = 0
ANZAHL_MONATE = '-1'
ANZAHL_TAGE = 0
DATUM_EIN = ZT_DT2
DATUM_EIN_ULT = ' '
ULTIMO_SETZEN = ' '
IMPORTING
DATUM_AUS = ZLSDAY.
E_TT =
E_ULTKZ =
l_s_range-low = ZFIDAY .
l_s_range-high = ZLSDAY .
l_s_range-sign = 'I'.
l_s_range-opt = 'EQ'.
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ENDLOOP.
*****************************************End*************************************
**To get the From date (For Text Variable) as per the user input date interval range**
WHEN 'ZR_S'.
LOOP AT i_t_var_range INTO loc_var_range WHERE vnam = 'ZDAY_IN'.
CLEAR: l_s_range.
ZT_DT1 = loc_var_range-low.
ZT_DT2 = loc_var_range-HIGH.
CALL FUNCTION 'DATE_CREATE'
EXPORTING
ANZAHL_JAHRE = 0
ANZAHL_KALTAGE = 0
ANZAHL_MONATE = 0
ANZAHL_TAGE = 0
DATUM_EIN = ZT_DT1
DATUM_EIN_ULT = ' '
ULTIMO_SETZEN = ' '
IMPORTING
DATUM_AUS = ZFIDAY .
E_TT =
E_ULTKZ =
l_s_range-low0(2) = ZFIDAY6(2).
l_s_range-low+2(1) = '.'.
l_s_range-low3(2) = ZFIDAY4(2).
l_s_range-low+5(1) ='.'.
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l_s_range-sign = 'I'.
l_s_range-opt = 'EQ'.
APPEND l_s_range TO e_t_range.
ENDLOOP.
*****************************************End*************************************
Please let me know if any clarification required..
Rinku..

How to edit the where clause of View object in search example dynamically

Hi,
I am new to OA Framework. Can anybody please tell me how can I assign the where clause dynamically. I want to search only those rows whose creation date is between a 'Date form' and 'Date to' inputs from the search page
Thanks
Anupam

user567342 ,
I will advice u again pls refer dev guide, there u can find code sample for ur requirement, which can be accomplished using stringbuffer.
--Mukul

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I am using a DFF(Descriptive FlexField), which needs to display the value of a certain column(say columnA) on the basis of the value of another column(say columnB).
So i have created a value set which points to the table which has both these columns, and the DFF uses this value set. However, the problem is that I have not put any where clause in the value set, because of which i cannot handle the exact fetch returns more than one rows error.
The query has to be as follows:
select ColumnA from tbl where ColumnB = [ a form value ];
What I want to know is how can i get the value of a certain field of a certain block of the form in the above query.
Edited by: 981615 on Jan 14, 2013 12:48 AM
Edited by: 981615 on Jan 14, 2013 12:48 AM

Just have a look over these two statements if it solves your problem
one time where clause
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Hi All,
I have a View object having the query below:
SELECT rownum LINENUM,
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        B.QUANTITY_DELIVERED PICKQTY
from   MTL_TXN_REQUEST_HEADERS A,
        MTL_TXN_REQUEST_LINES B
WHERE A.HEADER_ID=B.HEADER_ID
   AND A.MOVE_ORDER_TYPE=2
   AND 'on'=:1
   AND B.TO_SUBINVENTORY_CODE=NVL(:4,B.TO_SUBINVENTORY_CODE)
   AND A.request_number=NVL(:5,A.REQUEST_NUMBER)
UNION ALL
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        a.INVENTORY_ITEM_ID INVITMID,
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FROM WIP_REQUIREMENT_OPERATIONS a,
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vo.setWhereClause("LINE_ID in "+wherclause);
please help me out
Thnaks
Deb

Hi Gaurav,
Thnaks for the reply i tried belwo way u suggested but the query is executing multiple times and i am not getting the correct data as expected.
public void processPOData (String wherclause)
             OAViewObject vo = this.getXXDPECONTAINLINESVO1();
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in my log file the query is forming like below:
SELECT * FROM (SELECT * FROM (SELECT * FROM (SELECT * FROM ( SELECT * FROM ( SELECT rownum LINENUM,
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        B.INVENTORY_ITEM_ID INVITMID ,
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        B.TO_SUBINVENTORY_CODE UNLOADINGPNT,
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        NULL WORKORDNUM,
        NULL DTRNUM,
        A.description,
        A.FROM_SUBINVENTORY_CODE FROM_SUB,
        A.TO_SUBINVENTORY_CODE TO_SUB,
        NULL SOURCE
from   MTL_TXN_REQUEST_HEADERS A,
        MTL_TXN_REQUEST_LINES B
WHERE A.HEADER_ID=B.HEADER_ID
   AND A.MOVE_ORDER_TYPE=2
UNION ALL
SELECT rownum LINENUM,
        a.wip_entity_id LINE_ID,
        a.INVENTORY_ITEM_ID INVITMID,
        a.QUANTITY_ISSUED PICKQTY,
        a.ATTRIBUTE2 UNLOADINGPNT,
        NULL RRNUM,
        b.WIP_ENTITY_NAME WORKORDNUM,
        NULL DTRNUM,
        b.description,
        NULL FROM_SUB,
        NULL TO_SUB,
        b.source SOURCE
FROM WIP_REQUIREMENT_OPERATIONS a,
        eam_work_orders_v b
WHERE a.wip_entity_id=b.wip_entity_id ) )) where LINE_ID = 30026) where LINE_ID = 30026) where LINE_ID = 30026
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How to establish a where clause dinamically in a form?

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In the BD i have the table Activities (pk=codi_acti), the table documents (pk=codi_docu) and one more table for associate both called activities_documents (pk=codi_acti, codi_docu).
The user editing the activity X after click the button must see all the documents of X but nothing else.
My first attempt was a MD Form with the table activities_documents as master and the table documents as detail, but documents have a blob column and then this is not possible.
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Please Help!!!
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Forms can autoquery data based on the URL used to call the form. You can build the URL
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begin
declare
my_url varchar2(2000);
n_rl_id number;
begin
n_rh_id:=p_session.get_value_as_NUMBER(
p_block_name => 'MASTER_BLOCK',
p_attribute_name => 'A_RH_ID',
p_index => 1
my_url := 'PORTAL30.wwa_app_module.link?' ||
'p_arg_names=_moduleid&p_arg_values=<your form id>' ||
'&p_arg_names=_show_header&p_arg_values=YES' ||
'&p_arg_names=rh_id&p_arg_values=' || LTRIM(TO_CHAR(n_rh_id)) ||
'&p_arg_names=_rh_id_cond&p_arg_values=%3D';
-- %3d means "="
go (my_url);
end;
end;

Query Builder - Where Clause - Could not format error using date comparison

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Level: Severe
Source: o.d.r.queryBuilder.SQLGenerator
Message: Could not format :2010-09-02 16:20:31.0
Then under the Show SQL tab it doesn't display the date(s) you selected, e.g.
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Also the View Results tab does not display any results.
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Hi Gordon,
When I add the following lines:
declare @refdt1 date
set @refdt =
/*select 1 from jdt1 t0 where t0.RefDate*/ '[%1]'
declare @refdt2 date
set @refdt =
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... the error message is now:
Must declare the scalar variable @refdt1
Note: Before adding these lines, the query works perfectly, and returns totals from the whole database (with dynamically generated column headings!)
Thanks
Leon Lai
AMENDED QUERY:
declare @refdt1 date
set @refdt1 =
/*select 1 from jdt1 t0 where t0.RefDate*/ '[%1]'
declare @refdt2 date
set @refdt2 =
/*select 1 from jdt1 t0 where t0.RefDate*/ '[%2]'
--------- I inserted the 6 lines above ---------------------
DECLARE @listCol VARCHAR(2000)
DECLARE @query VARCHAR(4000)
SELECT @listCol =
STUFF
( SELECT DISTINCT '],[' + CAST(month(T0.RefDate) AS varchar)
FROM JDT1 T0
FOR XML PATH('')
), 1, 2, ' ') + ']'
SET @query =
'SELECT * FROM
(SELECT Account, month (T0.RefDate) Month , Debit
FROM JDT1 T0
------------------- I add the WHERE clause below --------------------
WHERE T0.RefDate >= @refdt1 and T0.RefDate <= @refdt2
GROUP BY Account, RefDate, Debit
) S
PIVOT
Sum(Debit)
FOR Month IN ('+@listCol+')
) AS pvt'
EXECUTE (@query)
Edited by: LEONLAI on Oct 21, 2011 2:36 PM

VPD - How to make the where clause a correlated query

Hi,
My VPD function has the following where clause:
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' and p.CLASS_CODE='||''''||l_class||''''||
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Thanks

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SELECT *
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How to modify the where clause in this to include other things

How do I modify the WHERE clause in this code:
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to include things like searching multiple columns and IF NULL:
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Where on earth does it go?
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My goal is to have a search form and results combination that:
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database table);
3) and to permit some of the seach fields to search multiple columns, for
example the search form field ‘sonsName’ would look for that information in
three different database table colums, (sonsName1, sonsName2 etc.).
You’ve given me code that permits 1) above to work beautifully. You’ve also
sent along code that should let me accomplish the other two, and though I’ve
been able to recreate below what I want the multiple search column to do, I
can get neither the multiple column nor the IS NULL sections to work in the
code you sent most recently.
How do I take something like this:
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$colname2_rsSearch = "-1";
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$colname3_rsSearch = "-1";
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GetSQLValueString($colname_rsSearch,
"text"),GetSQLValueString($colname2_rsSearch,
"text"),GetSQLValueString($colname3_rsSearch,
"text"),GetSQLValueString($colname3_rsSearch,
"text"),GetSQLValueString($colname3_rsSearch, "text"));
$rsSearch = mysql_query($query_rsSearch, $connStr_Milo_db) or
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$row_rsSearch = mysql_fetch_assoc($rsSearch);
$totalRows_rsSearch = mysql_num_rows($rsSearch);
?> (I’ve excluded the IS NULL part from my example, but need it in the final
version)
…and make it work using your code below (which permits someone to search
with empty form fields, but does not yet enlighten me on what to group (with
parenthesis) to make the code execute the multiple column search and the IS
NULL parts of the search.
mysql_select_db($database_connStr_Milo_db, $connStr_Milo_db);
$expected = array('first_name_now', 'last_name_now', sonsName'
$query_search = 'SELECT milo.first_name_now, milo.last_name_now,
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$where = false;
foreach ($expected as $var) {
if (isset($_POST[$var]) && !empty($_POST[$var])) {
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      $query_search .= ' AND ';
    } else {
      $query_search .= ' WHERE ';
      $where = true;
$query_search .= '(' . $var . ' = '. GetSQLValueString($_POST[$var],
'text') .
' OR ' . $var . ' IS NULL)';
$search = mysql_query($query_search, $connStr_Milo_db) or
die(mysql_error());
$row_search = mysql_fetch_assoc($search);
$totalRows_search = mysql_num_rows($search);
As always, thank you.

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Thanks

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From what I understood
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open cv for
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from t1, t2, t3
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AND condition3'
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Raj

How to dynamically build where clause in Linq

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