ORA-01460: unimplemented or unreasonable conversion requested - oracle

When I run the following .Net code:
using (var c = Shared.DataSources.BSS1.CreateCommand())
{
c.CommandText = "\r\nSelect c1, c2, c3, rowid \r\nFrom someSpecificTable \r\nWhere c3 = :p0";
var p = c.CreateParameter() as Oracle.DataAccess.Client.OracleParameter;
c.Parameters.Add(p);
p.OracleDbType = Oracle.DataAccess.Client.OracleDbType.Varchar2;
p.DbType = System.Data.DbType.AnsiString;
p.Size = 20;
p.Value = "007";
p.ParameterName = ":p0";
using (var r = c.ExecuteReader())
{
r.Read();
}
}
I get the following error:
ORA-01460: unimplemented or unreasonable conversion requested
ORA-02063: preceding line from XXX
This is not my database, and I don't have control over the select statements that I get, that table IS from a database link.
The funny thing is that if I add the following code just before the ExecuteReader it runs fine.
c.CommandText = c.CommandText.Replace("\r\n", " ");
Unfortunately that is not a good solution in my case as I can't control to SQL nore can I change it that way.
As for the table itself, the columns are:
c1 Number(5)
c2 varchar2(40)
c3 varchar2(20).
I know that ORA-02063 that comes after indicate something about a database link, but I looked in the synonim table and it didn't come from any database_link, and also I don't think that \r\n should affect database link.
I tried running the query without bound parameters, and it did work - but again bad practice to do so in a general term.
The trouble is that a competing tool that is not .Net based, is working and thus it's not a general problem.
I also couldn't reproduce the problem in my own environment, this is a customer database and site.
I am using instant client 11.1.6.20 and also tested it with instant client 11.2.3.0
The db is 10 and the db link is to an oracle v8 database
Any help would be appreciated

This problem can be recreated with straight forward steps. That is, any SQL query having a string literal, in where clause, more than 4000 characters in length gives an error "ORA-01704: string literal too long"
But, when the same query is executed through JDBC it gives "ORA-01460: unimplemented or unreasonable conversion requested"

Finally I found the answer!!!
After investigating and reflecting into the code I found that by changing the Direction of the Parameter to input output - the problem was resolved.
p.Direction = ParameterDirection.InputOutput;

After much investigation I found out that it's all about the fact that we have bound parameters that are used from ODP.NET and targeting tables from a DBLINK to a V8 Oracle server.
Once I eliminated the bound parameters it all worked.
It was a while back, but I think it's had something to do with varying string lengths of the strings sent to the bound parameter.
It seems that it ignored the size property, so if in the first query I sent a string with length 10 and in the second string I sent a string with length 12, I'll get that error.
I also found the oracle articles about it :
https://community.oracle.com/thread/2460796?tstart=0
and the patch for it:
https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=745005.1
But - I found a fix in my code that actually solved it - see my next answer.
Hope this helps anyone.

The accepted answer didn't work for me. However, after reading the attached links, I applied the following – although it does involve editing the SQL.
In my case, I knew the maximum left of the bind variable (the length reducing after the first call is what causes the issue). So I padded the .NET string, and added a TRIM in the SQL. Following your example:
c.CommandText = "\r\nSelect c1, c2, c3, rowid \r\nFrom someSpecificTable \r\nWhere c3 = TRIM(:p0)";
...
p.Value = "007".PadRight(10);

Related

Dapper.net Oracle parameter

I am trying to use Dapper.net with Oracle.
From this post i understood that we could use parameters with no prefixes and dapper would then work for both sql serverand oracle
I'm having a hard time making it to work without the explicit oracle named parameters prefix :
The following query
sqlConnection.Query("Select * FROM document WHERE id = param1", new { param1 = 963 });
Throws ORA-00904: "PARAM1": invalid identifier
If i try with the # prefix it throws ORA-00936: missing expression
If i use the : prefix it works as expected. But i do not want my queries to be dependent (as far as possible) upon Oracle or Sql Server.
I am using the latest nuget package version Dapper.dll 1.12.1.1
What am I doing wrong or did i misunderstand this post?
Yes, you misunderstood the post. The SQL is passed through as-is, and must contain the correct :param1 or #param1 etc. The "no prefix at all" is talking about the code that you don't see - specifically, making sure that the code does (via some mechanism):
cmd.Parameters.Add("param1", 963);
vs
cmd.Parameters.Add("#param1", 963);
vs
cmd.Parameters.Add(":param1", 963);
The first (no prefix) is the correct and preferred option.
If you want the SQL in your code to be parameter agnostic, you could use the information from here: Get the parameter prefix in ADO.NET
The SQL is rarely close enough, however, that just looking up the parameter prefix will fix all problems.

Oracle and TOAD (and I) disagree on number of variables to bind

At runtime, I'm getting "ORA-01008 - not all variables bound" with a SQL statement that runs fine in TOAD and in which TOAD (and I) only find one parameter.
As can be seen below, there IS only one parameter in the query. Why would Oracle think there are more than one parameters/variables and cause an exception to be thrown?
I cannot show the real sql, but here is a facsimile of it (column/table names changed):
SELECT DECODE(POSTWHEELTYPE,'0','NONE','D','NUMERIC','D','RESTRICTED NEEDLE','X','TRANSFER TO WINTER','A','ACCESS CODE') HALTYPE,
DECODE(VALIDATIONTYPE,'0','NONE','A','FOXPRO CODE','P','PERSONAL CODE','S','RESTRICTED') JBJTYPE,
LAZYNUMBER,
DISPLAYTEXT,
MINLENGTH || '-' || MAXLENGTH LENGTH,
NVL(INSTRUCTIONS, '<NONE>') INSTRUCTIONS
FROM
ABC.CODELAZYS
WHERE
BQSERVERABCID = :ABCID
AND VALIDATIONTYPE <> '0'
ORDER BY
LAZYNUMBER DESC
If Oracle is returning this error code, I would bet the better part of my last dollar that the variable was not bound. Just because TOAD has provided a value for the variable does not mean that it's bound in other clients.
Are you 100% positive your one variable is indeed bound? Where are you running the query that fails? Can you show us how it's called?
The problem was that I was binding the variable too late; once I moved it above the call to ExecuteReader(), it worked.

ORA-00907 Error when using Analytic Function in a Query (PS/Query, Peopletools 8.51.12)

Query's throwing an ORA-00907 Error when I try to paste a list of values into a criteria.
Background: I'm not a developer, I'm just an end user that's studied enough to where I can write queries using PS/Query within Peoplesoft,
for my company's implementation. I work with Peoplesoft's FSCM module
(Financials and Supply Chain Management), currently on Version FSCM
8.90.08.024, using I think Oracle 11g as the base database.
I'm mostly self-taught, and the technical experts we have are busy
with database/application stuff, or they aren't familiar with my
section's specific data needs.
I should point out that I'm unable to directly write SQL statements to
Query the database. I have to use a built-in program called "PS/Query"
(also known as Query Manager) with a GUI that writes the SQL for you
and saves it as a Query that you can run to the database to extract
data. This is relevant to my question only in that:
1. I cannot create or alter views/tables
2. I cannot perform any type of SQL Statement except "SELECT"
3. I can embed PL/SQL, MetaSQL and plain SQL into Expressions
4. At this point, Query Manager is the only option I have.
PS/Query is my only experience with SQL so far, aside from Oracle's
documentation and sites like this. From my research, it's considered
extremely confining by "actual" SQL programmers.The restrictions on it
require you to do things in a manner that violates what seem to be
best practices of SQL coding.
Query Request: I have a query I've been requested to write that pulls out spend (on Vouchers and POs) against certain system-defined
Category Codes. What I'm trying to do is pull in Voucher IDs, sum the
merchandise amounts on them by Vendor and Category Code, and display
the results. Or in other words, for every unique combination of
Vendor/Category, add up all the Voucher Amounts that have that
Vendor/Category combination.
Using the SUM (Fieldname) OVER (PARTITION BY fieldname, fieldname)
syntax.
So the end result should look something like...
Code Vendor Amount
123-45 Acme $5000.00
123-45 Apple $4200.00
123-46 Acme $750.00
With that said, here's the SQL that Query Manager is displaying to get the result set I showed above:
SELECT DISTINCT D.CATEGORY_CD, D.TN_DESCR1000, C.VENDOR_ID, E.NAME1, SUM ( A.MERCH_AMT_VCHR) OVER (PARTITION BY D.CATEGORY_CD, C.VENDOR_ID),E.SETID,E.VENDOR_ID
FROM PS_PO_LINE_MATCHED A, PS_PO_LINE B, PS_PO_HDR C, PS_ITM_CAT_TBL D, PS_VENDOR E, PS_PYMNT_VCHR_XREF F
WHERE A.BUSINESS_UNIT = B.BUSINESS_UNIT
AND A.PO_ID = B.PO_ID
AND A.LINE_NBR = B.LINE_NBR
AND B.BUSINESS_UNIT = C.BUSINESS_UNIT
AND B.PO_ID = C.PO_ID
AND D.CATEGORY_ID = B.CATEGORY_ID
AND D.EFFDT =
(SELECT MAX(D_ED.EFFDT) FROM PS_ITM_CAT_TBL D_ED
WHERE D.SETID = D_ED.SETID
AND D.CATEGORY_TYPE = D_ED.CATEGORY_TYPE
AND D.CATEGORY_CD = D_ED.CATEGORY_CD
AND D.CATEGORY_ID = D_ED.CATEGORY_ID
AND D_ED.EFFDT <= SYSDATE)
AND ( F.SCHEDULED_PAY_DT >= TO_DATE('2010-07-01','YYYY-MM-DD')
AND F.SCHEDULED_PAY_DT <= TO_DATE('2011-06-30','YYYY-MM-DD'))
AND D.CATEGORY_CD LIKE :1
AND E.VENDOR_ID = C.VENDOR_ID
AND A.BUSINESS_UNIT = F.BUSINESS_UNIT
AND A.VOUCHER_ID = F.VOUCHER_ID
ORDER BY 1
Underlying Issue: This works fine, but it can only prompt on one
Category Code at a time. Category Codes are 5 digits, a 3-digit
"Class" followed by a dash and then a 2-digit "subclass. I have a list
of 375 Category Codes I need to get this Query result for.
I've set up a prompt on this version that allows entry of a Wildcard
(So 123-%%), but that's still about a hundred separate runs of the
Query. Query Manager allows use of an "In List" expression type in
Criteria, but it requires you to manually enter each entry in the
list.
I'm trying to set it up to where I can paste a plaintext copy of the
Code list into an Expression, with proper quotes/commas, and have it
evaluate that to give me a combined list of all the NIGP codes
specified. The Prompt field created by Query Manager doesn't allow
pasting of lists (as far as I know).
Attempted Solution: I viewed the page at http://peoplesoft.ittoolbox.com/groups/technical-functional/peoplesoft-other-l/create-an-expression-in-psoft-90-query-to-paste-a-list-of-emplids-2808427 and I've tried some of the answers given there, but none of them worked. That page led to me trying this modified SQL (obviously the list of codes is truncated a bit for display here):
SELECT DISTINCT D.CATEGORY_CD, D.TN_DESCR1000, C.VENDOR_ID, E.NAME1, SUM ( A.MERCH_AMT_VCHR) OVER (PARTITION BY D.CATEGORY_CD, C.VENDOR_ID),E.SETID,E.VENDOR_ID
FROM PS_PO_LINE_MATCHED A, PS_PO_LINE B, PS_PO_HDR C, PS_ITM_CAT_TBL D, PS_VENDOR E, PS_PYMNT_VCHR_XREF F
WHERE A.BUSINESS_UNIT = B.BUSINESS_UNIT
AND A.PO_ID = B.PO_ID
AND A.LINE_NBR = B.LINE_NBR
AND B.BUSINESS_UNIT = C.BUSINESS_UNIT
AND B.PO_ID = C.PO_ID
AND D.CATEGORY_ID = B.CATEGORY_ID
AND D.EFFDT =
(SELECT MAX(D_ED.EFFDT) FROM PS_ITM_CAT_TBL D_ED
WHERE D.SETID = D_ED.SETID
AND D.CATEGORY_TYPE = D_ED.CATEGORY_TYPE
AND D.CATEGORY_CD = D_ED.CATEGORY_CD
AND D.CATEGORY_ID = D_ED.CATEGORY_ID
AND D_ED.EFFDT <= SYSDATE)
AND ( F.SCHEDULED_PAY_DT >= TO_DATE('2010-07-01','YYYY-MM-DD')
AND F.SCHEDULED_PAY_DT <= TO_DATE('2011-06-30','YYYY-MM-DD'))
AND D.CATEGORY_CD = '005-00' OR D.CATEGORY_CD IN ('015-00,'' '015-06,'' '015-10,'' '615-07'')
AND E.VENDOR_ID = C.VENDOR_ID
AND A.BUSINESS_UNIT = F.BUSINESS_UNIT
AND A.VOUCHER_ID = F.VOUCHER_ID
ORDER BY 1
And the SQL above is what's giving me the ORA-00907 error. Has anyone ran into this problem before? Massive wall of text, I know. My apologies. This is my first post here and I'm trying not to leave anything relevant out.
I've got the immediate problem that spurred this question fixed,but that request is just the tip of a very large iceberg, and at some point I need to figure out a way to be able to paste plaintext lists in as criteria using Query Manager, preferably in a way that plays nice with Analytic Grouping.
TL;DR version:
Using Peoplesoft Query Manager to do an Analytic SUM with grouping using OVER, PARTITION BY. When I try to paste a list into the criteria, it throws an ORA-00907 Error.
Any help would be greatly appreciated. Thanks!
Ok, after a bit more tweaking with this, I've found what I think is the underlying issue.
The error, in this case, is two-fold. Part of it was my fault (I didn't check for Peoplesoft mangling the quotation marks I pulled from Word), and part of it was the way Query Manager interprets some kinds of functions (you have to wrap some stuff in a Case When statement to get it to evaluate properly).
First, the "My Fault" part:
Every time I was pasting in my list of test NIGP Codes, I was doing it from a file I kept saved in Microsoft Word.
Which has the probably-handy "replace straight quotes with smart quotes" feature. Peoplesoft goes bonkers when its presented a "smart quote", and will display them as upside-down question marks (there's probably a technical term, I don't know it).
So when I'd test suggestions (such as fixing the quote/comma order as suggested by #Rene Nyffenegger and #WayneH) I'd start with my base test query, add in the expressions and test it, saving it as a separate query. If they didn't work, I'd go back to the base query. That way I could iterate changes and save potential tests as different versions.
My mistake was in not saving the different versions, leaving the application and going back in. It's when you save the query, leave the page, go somewhere else in Peoplesoft, then go back to open Query Manager that it actually shows you that it's doing the character conversion. You can't see it unless you do that. Even though Query Manager is doing it. So it was throwing a character Query Manager wouldn't recognize, but not showing me the character it wouldn't recognize.
I got a new work PC recently, and I've now disabled the Smart Quotes auto-replace for future use.
Second, the "Query Manager: part:
On the version of this that I got to work, I made use of wrapping the "IN" function inside a Case statement. I've found that a lot of SQL functions, when used "plain" (as I'd define them by just copy-pasting from Oracle's definitions pages and filling in the appropriate variables) tend to give PS/Query (Query Manager) heartburn. But if you wrap them inside a CASE...WHEN...END statement that evaluates the result of the function and then build a criteria that selects based on certain values of that result, the function will work and properly display a result.
So for an example, set up this expression (like in the example from #qyb2zm302). I'm using different codes from what was in my original example, but they work the same (they're all five-digit, character-typed codes consisting of three digits, a dash, then two digits)
Case when E.CATEGORY_CD IN
('375-15', '375-30', '375-54', '375-60', '380-30','938-63')
then 'true'
else 'false'
end
And then set a criteria:
AND
Case when E.CATEGORY_CD IN
('375-15', '375-30', '375-54', '375-60', '380-30','938-63')
then 'true'
else 'false'
end
= 'true'
It'll run to completion and return any rows that have that Category Code.
If you don't want to do that, you can do like in #qyb2zm302's Method 2. The only downside to that in Query Manager is that you have to enter them into individual rows in the "List", and if you can only copy-paste 25 at a time.
Wrapping it in a Case Statement lets you paste it directly into an Expression, which is far better for larger lists.
Solutions:
The above is the code I went with that worked. It's simplifying a bit for brevity's sake, but it works.
In List works through the native Query Manager option as long as you manually-populate the list
D.CATEGORY_CD = '005-00' OR works as long as you wrap it in a Case Statement
D.CATEGORY_CD IN ('015-00','015-06','015-10','615-07') works as long as you wrap it in a Case Statement
Peoplesoft hates Smart Quotes. None of the above will work if you're copying quotation marks directly from Word, but you won't see it unless you save, leave and come back to the same query in edit mode
Formatting is important. All of the above require the proper comma/quotation formatting, as pointed out by Rene and Wayne. Meaning: ('xxx-xx', 'xxx-01','xxx-02') etc
Thanks to everyone who helped on this! I don't think I've head-desked this hard before on any question, but I guess that's part of the learning process. Since all the answers posted are valid and correct (or at least a portion of the larger "correct"), I'm going to flag them all.
The
D.CATEGORY_CD IN ('015-00,'' '015-06,'' '015-10,'' '615-07'')
part looks fishy to me
Since a '' within a string "evaluates" to a single ' the first string is
'015-00,'' '
followed by (the non-string)
015-06,
The following '' is probably the thing that the parser stumbles upon since it's pretty meaningless.
Edit try it with a D.CATEGORY_CD IN ('015-00', '015-06', '015-10', '615-07').
Following the link you posted, I see 2 methods for doing what you are trying to accomplish.
I also notice that you tried a 3rd method.
Method 1
Criteria > Add Criteria
Expression Type: Character
Length: 255
Expression Text: D.CATEGORY_CD IN ('015-00','015-06','015-10','615-07') AND 1
Condition Type: equal to
Constant: 1
Method 2
Criteria > Add Criteria
Field: D.CATEGORY_CD
Condition Type: in list
Value: 015-00','015-06','015-10','615-07
Method 3 (Your Method)
Criteria > Add Criteria
Field: D.CATEGORY_CD
Condition Type: equal to
Define Expression: '015-00' OR D.CATEGORY_CD IN ('015-00','015-06','015-10','615-07')
Question) Does the below exactly match the text you are putting the Expression box?
'015-00' OR D.CATEGORY_CD IN ('015-00','015-06','015-10','615-07')
If not, what are you putting in that box?
I think the D.CATEGORY_CD criteria are giving you the problems, I changed the double quotes to single quotes and then it still looked strange to me. I then notice the commas are inside your quotes and not between them, try making the one criteria line look like this:
before:
OR D.CATEGORY_CD IN ('015-00,'' '015-06,'' '015-10,'' '615-07'')
after:
OR D.CATEGORY_CD IN ('015-00', '015-06', '015-10', '615-07')
Also, the "IN" is an implied "OR" and I am not sure if you have parenthesis around the two D.CATEGORY_CD,
I would just put the one additional code into the IN criteria and remove the "D.CATEGORY_CD =" line:
before:
AND D.CATEGORY_CD = '005-00' OR D.CATEGORY_CD IN ('015-00', '015-06', '015-10', '615-07')
after:
AND D.CATEGORY_CD IN ('015-00', '015-06', '015-10', '615-07', '005-00')
Of course, you are already ordering by CATEGORY_CD, you could remove this criteria and pull all categories in one run (that is unless there are too many rows for excel), and then you might also want to include either VENDOR_ID or NAME1 in the ORDER BY clause.
Hope that helps you.

Oracle "SQL Error: Missing IN or OUT parameter at index:: 1"

I have an Oracle script that looks like the following:
variable L_kSite number;
variable L_kPage number;
exec SomeStoredProcedureThatReturnsASite( :L_kSite );
exec SomeStoredProcedureThatAddsAPageToTheSite( :L_kSite, :L_kPage );
update SiteToPageLinkingTable
set HomePage = 1
where kSite = :L_kSite and kPage = :L_kPage;
Supposedly the last statement is a valid use of a bind variable but when I try to run the script I get this on the last line:
SQL Error: Missing IN or OUT parameter at index:: 1
I'm not sure how to proceed here as I'm not especially proficient in Oracle.
I had a similar error on my side when I was using JDBC in Java code.
According to this website (the second awnser) it suggest that you are trying to execute the query with a missing parameter.
For instance :
exec SomeStoredProcedureThatReturnsASite( :L_kSite );
You are trying to execute the query without the last parameter.
Maybe in SQLPlus it doesn't have the same requirements, so it might have been a luck that it worked there.
Based on the comments left above I ran this under sqlplus instead of SQL Developer and the UPDATE statement ran perfectly, leaving me to believe this is an issue in SQL Developer particularly as there was no ORA error number being returned. Thank you for leading me in the right direction.
I think its related with jdbc.
I have a similar problem (missing param) when I have a where condition like this:
a = :namedparameter and b = :namedparameter
It's ok, When I have like this:
a = :namedparameter and b = :namedparameter2 (the two param has the same value)
So it's a problem with named parameters.
I think there is a bug around named parameter handling, it looks like if only the first parameter get the right value, the second is not set by driver classes. Maybe its not a bug, only I don't know something, but anyway I guess that's the reason for the difference between the SQL dev and the sqlplus running for you, because as far as I know SQL developer uses jdbc driver.
I got the same error and found the cause to be a wrong or missing foreign key. (Using JDBC)
I had this error because of some typo in an alias of a column that contained a questionmark (e.g. contract.reference as contract?ref)
I had issue in SQL Developer because I was using binds incorrectly. Was using this, copied from log:
variable = ?
should be
variable = :variable
Now SQL Developer prompts me for values.
I got the same error sporadically appearing on some user setup, while others were content with the same report. I had my parameters written in altered case and with nordic letters, for example: Henkilö. I changed them to HENKILO, using only upper case and no nordics, and it did the trick.
The driver is some unknown or varying JDBC version to Oracle.
My error desc was originated from some 3rd party bin:
Excel Plugin Error: Failed executing statement (Missing IN or OUT parameter at index:: 4)
SQL Statement failed. Please verify and correct it!

SubSonic 3 Linq Join Problems

using the linqtemplates, I tried getting the linq syntax close to what is in the docs
var query = from c in db.CountyLookups
join s in db.StateLookUps on
c.StateLookupID equals
s.StateLookupID
where c.Name2 == countyName &&
s.Abbr == stateAbbr
select new
{
Latitude = c.Latitude,
Longitude = c.Longitude
};
var result = query.SingleOrDefault();
but when .SingleOrDefault() is called, I get a yellow screen of darn that says:
System.NotSupportedException: The member 'StateLookupID' is not supported
the stack trace ends up at:
SubSonic.Linq.Structure.TSqlFormatter.VisitMemberAccess(MemberExpression m)
the StateLookupID column has underscores in the database and is a regular int pk/fk.
what am I doing wrong?
So apparently VisitMemberAccess has no idea what to do with an int, only string and datetime (starting on line 152 of SubSonic.Linq.Structure.TSqlFormatter). I don't know why this would be called on a join, since a join is usually between an int pk/fk (or guid if you like).
I ended up scrapping the linq query in favor of SubSonic.Query.Select. Here is my new code that works:
var query = db.Select.From<CountyLookup>()
.InnerJoin<StateLookUp>()
.Where(CountyLookupTable.Name2Column)
.IsEqualTo(countyName)
.And(StateLookUpTable.AbbrColumn)
.IsEqualTo(stateAbbr);
I then call ExecuteTypedList and map the results back to my model class. Works like buttah. Just wanted to use linq in this case.
I get this error when I've added properties to my models (the IsValid property as mentioned in ASP.Net MVC 1.0, thanks Rob).
I've had this problem on and off for a bit, and I think I've got it nailed down to the query builder trying to build a query for something that should be done in code, not TSQL.
When it tries to generate the SQL, it descends down the path to generate the TSQL via VisitMemberAccess on a complex type (maybe a another model) but it only knows how to perform operations on datetimes and strings in VisitMemberAccess. I'm sorry if this is a bit incoherent, but I'm trying to get my head around it.
To get around this consider using something like LinqKit AsExpandable prior to any operation which will do the TSQL generation. I've tried this on a simple OrderBy which was going BANG and it appears to work but i have no idea yet what it will do to performance.
Actually I take that back I overcame my problem problem by doing
Stuff.All().Where(x=>x.Someid == id).ToArray()
.AsQueryable()
.Where(x=>x.SomeProp.SomeFlag == true);
It is crud, but it works.
This still appears to be a problem; namely in simple cases such as:
var list = from lang in db.Languages
join site in db.SiteConfigLanguages on
lang.Code equals site.LanguageCode
select lang;
This should evaluate to simple SQL (although pointless in this example):
SELECT Language.* FROM Language LEFT JOIN SiteConfigLanguage ON Language.Code = SiteConfigLanguage.LanguageCode;
It fails inside the same VisitMemberAccess function as (in this case) Language is not a recognisable declaring type (i.e. String or DateTime). It is very similar to the description #matware provided above however it sounds as though the "IsValid" member is pure C# code whereas in this case lang.Code is simply a reference to a column in the database.
I'm currently investigating workarounds as this is only a portion of the larger LINQ query which is failing for me; if I find anything I will post it here. Otherwise, any other solutions/workarounds to this problem known?
UPDATE: Ignore me here; this is simply due to me missing a simple line on the LINQ statement; you need to make sure that you use the "into" keyword to complete things!
i.e.
var list = from lang in db.Languages
join site in db.SiteConfigLanguages on
lang.Code equals site.LanguageCode into sl
from siteLang in sl.DefaultIfEmpty()
select lang;
I've got another error mind you but at least this particular exception is solved. The next one looks a bit nastier unfortunately (inside System.Linq library).

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