I am trying to write a query using eSQL wherein my entity has got navigation properties. I am not able to include these navigation properties in the query, even though in Linq to SQL we have this (Include method).
How will it be possible in eSQL?
Like so:
string esql = "Select value e from EFEntities.MyDataEntity as e";
ObjectQuery<Data.MyDataEntity> query = c.
CreateQuery<Data.MyDataEntity>(esql).
Include("MyNavigationProperty");
List<Data.MyDataEntity> entities = query.ToList();
Related
I have an API I am pinging which queries a cosmos db to return records.
I can filter on a simple string in my api call like so:
// return objects where '_Subject' field equals "filterTest"
string getUrl = $"...baseApiPath/?$filter=_Subject+eq+'filterTest'";
This is working perfectly.
But I cannot figure out the filter syntax to make my API query be based on ARRAY_CONTAINS.
// return objects where '_Attachments' field CONTAINS "945afd138aasdf545a2d1";
How would I do that? Is there a general reference for API filter syntax somewhere?
If you're asking about how to query, a query against a property with an array of values looks like this:
SELECT * FROM c WHERE ARRAY_CONTAINS(c._Attachments, "945afd138aasdf545a2d1")
Another example in this answer.
I have a parameterised named Query like this :
Query moveOutQuery = session.createSQLQuery(moveOutQueryStr.toString())
.addEntity(MyClass.class)
.setParameter("assignmentStatus", Constants.CHECKED_OUT)
I want to see the actual SQL query with parameters filled in. However while debugging I only get the following query:
Select * from my_assignment WHERE assignment_status in ( :assignmentStatus )
Why isn't the assignmentStatus being substituted for its real value?
Why isn't the assignmentStatus being substituted for its real value?
This is because NHibernate use query parameters to input values. This is efficient in many cases and also helpful against SQL Injection attack. Parameters are sent separately. You can find them at the bottom if SQL is logged as explained below.
You may log each SQL to file as explained below.
This is implemented through log4net.dll; you need to add reference.
Add namespaces as below:
using log4net;
using log4net.Appender;
using log4net.Core;
using log4net.Layout;
using log4net.Repository.Hierarchy;
Configure log4net in NHibernate as below:
Hierarchy hierarchy = (Hierarchy)LogManager.GetRepository();
hierarchy.Root.RemoveAllAppenders();
FileAppender fileAppender = new FileAppender();
fileAppender.Name = "NHFileAppender";
fileAppender.File = logFilePath;
fileAppender.AppendToFile = true;
fileAppender.LockingModel = new FileAppender.MinimalLock();
fileAppender.Layout = new PatternLayout("%d{yyyy-MM-dd HH:mm:ss}:%m%n%n");
fileAppender.ActivateOptions();
Logger logger = hierarchy.GetLogger("NHibernate.SQL") as Logger;
logger.Additivity = false;
logger.Level = Level.Debug;
logger.AddAppender(fileAppender);
hierarchy.Configured = true;
You also need to set ShowSql while configuration as below:
configuration.SetProperty(NHibernate.Cfg.Environment.ShowSql, "true");
configuration.SetProperty(NHibernate.Cfg.Environment.FormatSql, "true");
You need to call this code once at startup of your application. Output log includes values of parameters as well.
Following is the code:
session.CreateSQLQuery("SELECT * FROM MyEntity WHERE MyProperty = :MyProperty")
.AddEntity(typeof(MyEntity))
.SetParameter("MyProperty", "filterValue")
.UniqueResult<MyEntity>();
Following is the logged query:
2020-01-09 14:25:39:
SELECT
*
FROM
MyEntity
WHERE
MyProperty = #p0;
#p0 = 'filterValue' [Type: String (4000:0:0)]
As you can see, parameter value filterValue is listed at the bottom.
This works for all query APIs like IQueryOver, IQuery, ISQLQuery etc.
This logs both success and failed statements. You can play with FileAppender and Logger class to meet your additional requirements.
Also refer PatternLayout from documentation. More details can also be found here, here and here. This Q/A discusses the same.
Following Q/A may also help:
Get executed SQL from nHibernate
Using log4net to write to different loggers
How to log SQL calls with NHibernate to the console of Visual Studio?
As you see, this logs the parameter values at bottom of the query. If you want those logged embedded in the query, please refer to this article.
I would like to convert this SQL into either Criteria. I am sorry I don't know which one to use since I'm new to Hibernate. I've done some research, and it looks like both are needed to achieve what I wanted.
My Sql Request
select *
from change.pade pade, change.pade_etat rdp, par.safsit safsit, par.saf saf
where pade.sir = "1245454"
and pade.id_safsit = "1"
and pade.id_safsit = safsit.id
and safsit.cd_s in ("12", "45")
and safsit.fk_saf = saf.id
and saf.cd_ur in "124"
and rdp.fk_pade = pade.id
and rdp.id_etat in "444"
You can use the Hibernate properties instead of writing HQL like this
session.createSQLQuery(String sqlQuery)
see an example here
I am using NHibernate. I want to use join on queryover, try following code but this gives error,
session.QueryOver(Of Messages)()
.Where(Function(x) x.UserID_Messages.Username.Contains(msgfrom))
.And(Function(x) x.Message.Contains(msg))
.And(Function(x) x.MsgDate >= startdate)
.List
But this error = Unrecognised method call: System.String:Boolean Contains(System.String)
And if i try this query
session.QueryOver(Of Messages)
.JoinQueryOver(Of Users)(Function(x) x.UserID_Messages)
.WhereRestrictionOn(Function(x) x.Username).IsLike("%" & tosearch & "$")
.List(Of Messages)()
This result empty, even record is there in database. Please guide what am I doing wrong, or what is correct way to achieve this. Thanks
The .Contains method, is a .NET method, which is not translated into SQL statement when using QueryOver syntax. The second approach, with QueryOver native method IsLike is what we need. To be sure, that we will end up with a SQL like this:
username LIKE '%the searched value%'
we should use the built in MatchMode
.WhereRestrictionOn(Function(x) x.Username).IsLike(tosearch, MatchMode.Anywhere)
See the MatchMode class definition
I'm currently trying to create an Endeca query using the Java API for a URLENEQuery. The current query is:
collection()/record[CONTACT_ID = "xxxxx" and SALES_OFFICE = "yyyy"]
I need it to be:
collection()/record[(CONTACT_ID = "xxxxx" or CONTACT_ID = "zzzzz") and
SALES_OFFICE = "yyyy"]
Currently this is being done with an ERecSearchList with CONTACT_ID and the string I'm trying to match in an ERecSearch object, but I'm having difficulty figuring out how to get the UrlENEQuery to generate the or in the correct fashion as I have above. Does anyone know how I can do this?
One of us is confused on multiple levels:
Let me try to explain why I am confused:
If Contact_ID and Sales_Office are different dimensions, where Contact_ID is a multi-or dimension, then you don't need to use EQL (the xpath like language) to do anything. Just select the appropriate dimension values and your navigation state will reflect the query you are trying to build with XPATH. IE CONTACT_IDs "ORed together" with SALES_OFFICE "ANDed".
If you do have to use EQL, then the only way to modify it (provided that you have to modify it from the returned results) is via string manipulation.
ERecSearchList gives you ability to use "Search Within" functionality which functions completely different from the EQL filtering, though you can achieve similar results by using tricks like searching only specified field (which would be separate from the generic search interface") I am still not sure what's the connection between ERecSearchList and the EQL expression above?
Having expressed my confusion, I think what you need to do is to use String manipulation to dynamically build the EQL expression and add it to the Query.
A code example of what you are doing would be extremely helpful as well.