I am struggling to get a subsonic select query to work, I am writing a paging method and tried the following
Select ns = new Select(maincolumns.ToArray());
ns.PageSize = 10; ** Error Here **
ns.PageIndex = 1; ** And Error Here **
ns.Where("IsLive").IsEqualTo(true);
ns.And("Title").Like("%" + SearchTerm + "%");
ns.OrderAsc("RentalExVat");
return ns.ExecuteDataSet().Tables[0];
Now it doesn't recognise ns.PageSize Or ns.PageIndex, the rest of the query works fine?? I see I need to use the new 'Query' tool to be able to use these two, but I can't figure out the Query syntax??
any syntax help appreciated
SubSonic's query syntax is 'fluent', so in your code sample, the Where clause is not be applied to your query. This snippet may work better:
Select ns = new Select(maincolumns.ToArray());
ns = ns.Where("IsLive").IsEqualTo(true)
.And("Title").Like("%" + SearchTerm + "%")
.OrderAsc("RentalExVat")
.Paged(1, 10); // paging is set here
return ns.ExecuteDataSet().Tables[0];
Also, make sure your 'SearchTerm' has been SQL escaped (or use an alternate calling pattern) or you are vulnerable to SQL injection.
Related
I got this exception - "no viable alternative at input '?'", i feel it is because of "+" query statement.
private static final String CQL_BEAN = "cql:bean:cassandraCluster";
String updataQuery = "UPDATE user_preference SET preference = preference + ? WHERE user_id = ? AND tenant_id = ? IF EXISTS";
.to(CQL_BEAN + "/" + cassandraProperties.getKeyspaceName() + "?cql=" + this.updataQuery + "&prepareStatements=false")
Update: it could be because you are using prepareStatement=false - it looks like that in this case it won't substitute placeholders... Although I'm not expert in this integration.
....
What do you want to achieve with this syntax? Update only records that were inserted previously?
Usually LWTs are used only in very limited number of situations as they require coordination between nodes in the cluster, and seriously degrade performance. More details on LWTs you can find in documentation.
Simplistic Problem description:
Lucene index has two fields per document: ID and NAME.
I want to make a query using the Lucene Query interface such that I can find all the documents where ID is 1 OR 2 OR 3 OR so on. The IDs to be searched will be in a list and can potentially have upto 30 elements.
If I was using the query parser I would have done something like
ID:(1 OR 2 OR 3)
But the application is already heavily committed to the Query interface and I want to follow the current pattern. Only way I can think of doing this with Query interface is create n term queries and group them using the Boolean query as below
BooleanQuery booleanQuery = new BooleanQuery();
(String searchId : lstIds)
{
booleanQuery.add(new TermQuery(new Term("ID", searchId)), BooleanClause.Occur.SHOULD);
}
But is there a better/more efficient way of doing this?
Combining queries togetheer with a BooleanQuery is the correct way to reproduce a query like ID:(1 OR 2 OR 3). The query parser will generate a BooleanQuery similar to what you provided for that syntax, so you are absolutely doing the right thing here.
You might be able to make use of PrefixQuery, NumericRangeQuery or TermRangeQuery to simplify matters, if they actually suit your needs in practice, but there is nothing wrong with what you are doing already.
BooleanQuery is the solution for handling OR operator as you have shown in the code but if you want simple alternative of the it you could also use simple Query and pass the IDs as "1 OR 2 OR 3".
Here is the code snippet lucene 7.
Query query = new QueryParser("ID", analyzer).parse("1 OR 2 OR 3");
TopDocs topDocs = searcher.search(query, 10);
OR if you have all the OR you could also use QueryParser default Operator.
Here is the code snippet for lucene 7.
QueryParser queryParser = new QueryParser("ID", analyzer);
queryParser.setDefaultOperator(QueryParser.Operator.OR);
Query query = queryParser.parse("1 2 3");
TopDocs topDocs = searcher.search(query, 10);
I hope that work for you.
I am using Fluent NHibernate for my ORM. In doing so I am trying to use the NHibernate LINQ syntax to fetch a set of data with the power of LINQ. The code I have works and executes correctly with the exception being that a timeout is thrown if it takes longer than roughly 30 seconds to run. The question I have is how do I extend the default 30 second timeout for LINQ statements via NHibernate?
I have already seen the posts here, here, and here but the first two refer to setting the DataContext's Timeout property, which does not apply here, and the third refers to setting the timeout in XML, which also does not apply because I am using Fluent NHibernate to generate the XML on the fly. Not only that but the post is 2 years old and Fluent NHibernate has changed since.
With the ICriteria objects and even HQL I can specify the timeout, however that is not the goal here. I would like to know how to set that same timeout and use LINQ.
Example code:
using (var session = SessionFactory.OpenSession())
using (var transaction = session.BeginTransaction())
{
var query = (from mem in session.Query<Member>()
select mem);
query = query.Where({where statement});
int start = (currentPage - 1) * max);
if (start > 0)
query = query.Skip(start).Take(max);
else
query = query.Take(max);
var list = query.ToList();
transaction.Commit();
return list;
}
This code (where statement does not matter) works for all purposes except where a timeout occurs.
Any help is appreciated. Thanks in advance!
I ended up setting the command timeout for the Configuration for Fluent NHibernate. The downside to this is that it sets the timeout for ALL of my data access calls and not just the one.
Example code:
.ExposeConfiguration(c => c.SetProperty("command_timeout", (TimeSpan.FromMinutes(10).TotalSeconds).ToString()))
I found this suggestion from this website.
Nhibernate has extended the IQueryable and added a few methods https://github.com/nhibernate/nhibernate-core/blob/master/src/NHibernate/Linq/LinqExtensionMethods.cs
var query = (from c in Session.Query<Puppy>()).Timeout(12);
or
var query = (from c in Session.Query<Puppy>());
query.Timeout(456);
I've just spent fair amount of time fighting with this and hopefully this will save someone else some time.
You should use the .Timeout(120) method call at the very last moment to make sure it is used. TBH I'm not 100% sure on why this is but here are some examples:
WILL WORK
query = query.Where(x => x.Id = 123);
var result = query.Timeout(120).ToList();
DOESN'T WORK
query.Timeout(120);
query = query.Where(x => x.Id = 123);
var result = query.ToList();
If done like the second (DOESN'T WORK) example, it seems to fall back to the default System.Transaction.TransactionManager.DefaultTimeout.
Just in case anyone is still looking for this and finds this old thread too...
Query.Timeout is deprecated.
You should use WithOptions instead:
.WithOptions(o => o.SetTimeout(databaseTimeoutInSeconds))
Ok,
Today I am trying to learn Subsonic. Pretty cool stuff.
I am trying to build some search functionality into my website but am struggling about how I might achieve this in Subsonic.
I have one search field that could contain multiple keywords. I want to return results that match all of the keywords. The target on the search is a single text column.
So far I have this (it runs but never returns results):
return new SubSonic.Select().From(Visit.Schema)
.InnerJoin(InfopathArchive.VisitIdColumn, Visit.VisitIdColumn)
.Where(InfopathArchive.XmlDocColumn).Like(keywords)
.ExecuteTypedList<Visit>();
There is a one to one mapping between the Visit table and the InfoPathArchive table. I just want to return the collection of Visits that have the keywords in the related XMLDocColumn.
If I could get that working it would be great. Now the second problem is that if someone searches for 'australia processmodel' then obviously the above code should only return that exact phrase. How can I create a query that splits up my search term so that it must return documents that contain ALL of the individual search terms?
Any help appreciated.
Edit: Ok, so the basic search works, but the multiple keyword search doesnt. I did what Adam suggested but it seems Subsonic only uses one parameter for the query.
Here is the code:
List<string> wordsInQueryList = keywords.Split(' ').ToList();
SqlQuery q = Select.AllColumnsFrom<Visit>()
.InnerJoin(InfopathArchive.VisitIdColumn, Visit.VisitIdColumn)
.Where(Visit.IsDeletedColumn).IsEqualTo(false);
foreach(string wordInQuery in wordsInQueryList)
{
q = q.And(InfopathArchive.XmlDocColumn).Like("%" + wordInQuery + "%");
}
return q.ExecuteTypedList();
Then if I look at the query that Subsonic generates:
SELECT (bunch of columns)
FROM [dbo].[Visit]
INNER JOIN [dbo].[InfopathArchive] ON [dbo].[Visit].[VisitId] = [dbo].[InfopathArchive].[VisitId]
WHERE [dbo].[Visit].[IsDeleted] = #IsDeleted
AND [dbo].[InfopathArchive].[XmlDoc] LIKE #XmlDoc
AND [dbo].[InfopathArchive].[XmlDoc] LIKE #XmlDoc
So it ends up that only the last keyword is being searched for.
Any ideas?
First question:
return new SubSonic.Select().From(Visit.Schema)
.InnerJoin(InfopathArchive.VisitIdColumn, Visit.VisitIdColumn)
.Where(InfopathArchive.XmlDocColumn).Like("%" + keywords + "%")
.ExecuteTypedList<Visit>();
Second question:
Pass a List of words in your query to a function that builds a SubSonic query as follows
SqlQuery query = DB.Select().From(Visit.Schema)
.InnerJoin(InfopathArchive.VisitIdColumn, Visit.VisitIdColumn)
.Where("1=1");
foreach(string wordInQuery in wordsInQueryList)
{
query = query.And(InfopathArchive.XmlDocColumn).Like("%" + wordInQuery + "%")
}
return query.ExecuteTypedList<Visit>();
Obviously this is untested but it should point you in the right direction.
You can do what Adam is suggesting or with 2.2 you can simply use "Contains()" instead of Like("%...%"). We also support StartsWith and EndsWith() :)
I asked the following question on the subsonic forum, but only seemed to get one response, so I thought I'd post up here as well to see if anyone could shed some more light on the problem...
I wish to create the following SQL statement through SubSonic using the Select tool (or Query tool) .. it uses a custom function called "SPLIT()":
SELECT * FROM VwPropertyList
WHERE VwPropertyList.idCreatedBy = 123
AND VwPropertyList.idCounty = 45
AND 29 IN (SELECT Item FROM SPLIT(DistrictGroupList, ','))
(the last part of this SQL uses the SPLIT function)
My subsonic equivalent looks like the following...
Dim mySelect As New SubSonic.Select
mySelect.From(VwPropertyList.Schema)
mySelect.Where(VwPropertyList.Columns.IdCreatedBy).IsEqualTo(123)
mySelect.And(VwPropertyList.Columns.IdCounty).IsEqualTo(45)
mySelect.And(29).In(New SubSonic.Select("Item").From("SPLIT("
&
VwPropertyList.Columns.DistrictGroupList
& ", ',')"))
This doesn't work though due to the last part .. how can I add "AND 29 IN (SELECT Item FROM SPLIT(DistrictGroupList, ','))" into my Subsonic.Select ?
The response I got from the subsonic forum suggested I do away with Subsonic.Select and replace with hard-coded InlineQuery() statements .. like:
Dim SQL as String = "Select " &
VwPropertyList.Columns.Item SQL = SQL
& " From " &
VwPropertyList.Schema.TableName SQL =
SQL & " Where " &
VwPropertyList.Columns.IdCreatedBy & "
= #CreatedBy " SQL = SQL & " And " & VwPropertyList.Columns.IdCounty & " =
#County " SQL = SQL & " And
#DistrictGroup IN (Select Item From
SPLIT(DistrictGroupList,',')"
Items =
SubSonic.InlineQuery().ExecuteTypedList(Of
MyItem)(SQL, 123,45,29)
I would prefer to use SubSonic.Select if possible though so that I can avail of the paging functionality etc.
Any ideas?
You could do John's suggestion or you could write the SQL using our InlineQuery - which allows you to write raw SQL and pass in params:
var qry=new InlineQuery("SELECT * FROM table WHERE column=#param",value)
You could try to use the original query object (pre 2.1) like so (untested, from memory):
Query q = new Query(VwPropertyList.Schema.TableName);
q.WHERE("29 IN (SELECT Item FROM SPLIT(DistrictGroupList, ','))");
// pass q.ExecuteReader() to the Load() method of your view.
I would suggest that you use the original Query object as you are looking to get paging. Inline Query does not have any methods that allow paging.
If you absolutely wanted to use Subsonic.Select you could mesh the two ideas and run an Inline Query to get the list of values and then use a Regular Subsonic.Select and pass the retrieved values to the select case but then you would be making two trips to the db.
On a side note I prefer reading Subsonic.Select statements written using the fluent interface that it is namely
SubSonic.Select.AllColumnsFrom()
.Where(VwPropertyList.Columns.IdCreatedBy).IsEqualTo(123)
.And(VwPropertyList.Columns.IdCounty).IsEqualTo(45)
.ExecuteAsCollection();
thanks for the responses.
I ended up doing InlineQuery and just re-wrote the paging code that's normally produced by Subsonic.Select ... not the best solution but it seems to work.
It would be good if I could have done something like this though:
Dim s As New SubSonic.Select
s.From(VwPropertyList.Schema)
sWhere(VwPropertyList.Columns.IdCreatedBy).IsEqualTo(123)
sAnd(VwPropertyList.Columns.IdCounty).IsEqualTo(45)
s.And(29).In(New
InlineQuery("(SELECT Item FROM
SPLIT(DistrictGroupList, ','))"))