I want to construct the query which is going to be used in .net. Below you can see the sql query, any one can give me the equivalent subsonic query
SELECT DISTINCT
a2.AccountID AS BID,
a2.AccountName AS Brand
FROM
Account a
INNER JOIN Account a2 ON a.ParentID = a2.AccountID
WHERE
a.AccountTypeID = 6
ORDER BY
Brand
Please help me.
SubSonic 2 or 3?
With SubSonic you always have a nice backdoor.
It's called InlineQuery in 2.x and CodingHorror in 3.x
e.g:
var result = DB.Query().ExecuteReader("SELECT DISTINCT
a2.AccountID AS BID,
a2.AccountName AS Brand
FROM Account a
INNER JOIN Account a2 ON a.ParentID = a2.AccountID
WHERE a.AccountTypeID = ?accounttypeid
ORDER BY Brand", 6);
If you want to stay with the fluent interface because of the syntax checking and the sql conversion. Here is another approach I could think of (SubSonic 2.2)
DataTable result = DB.Select(
"a1." + Account.Columns.AccountId + " as BID",
"a2." + Account.Columns.AccountName + " as Brand")
.From(Account.Schema.QualifiedName + " a1")
.InnerJoin(Account.Schema.QualifiedName + " a2",
"a2." + Account.Columns.account_id,
"a1", "a1." + Account.Columns.parent_id)
.Where("a1." + Account.Columns.AccountTypeId).IsEqualTo(6)
.OrderAsc("a2." + Account.Columns.AccountName)
.ExecuteDataSet().Tables[0];
But I never did this and I haven't verified it. But maybe it works.
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.
I have the following optional, to-many relationship: PackingSlip <->> LineItem
I need to match all the PackingSlip instances that do not have any related LineItem instances with an qtyOrdered > qtyShipped.
What makes the most sense to me would be to write an expression along the lines of:
PackingSlip.LINE_ITEMS.containsMatch(LineItem.QTY_ORDERED.lt(LineItem.QTY_SHIPPED)).notExp();
Which I would expect to generate SQL along the lines of:
SELECT t0.id, ... FROM packing_slip t0
WHERE NOT (
EXISTS (
SELECT * FROM line_item t1
WHERE t1.packing_slip_id = t0.id
AND t1.qty_ordered < t1.qty_shipped
)
)
Obviously, I've made up the containsMatch(Expression) method. Since such a thing does not exist (currently), what is the best way of accomplishing this in Cayenne 4.0?
While I am not a big fan of EJBQLQuery, it can actually help here:
String ejbql =
"SELECT ps FROM PackingSlip ps " +
"WHERE NOT EXISTS " +
"(SELECT li FROM LineItem li WHERE li " +
"MEMBER OF ps.lineItems AND li.qtyOdered < li.qtyShipped)";
EJBQLQuery query = new EJBQLQuery(ejbql);
List<PackingSlip> objects = context.performQuery(query);
As well as SQLSelect query.
Objective:
I have a table called Publication that contains Id, RecordId, EntityType and a couple other columns. I select all the records that need to be published to another database from that table. I then loop that collection to process the records and move the records to the other db.
Background:
The EntityType column is used to Identify the Set that the context needs to retrieve. I also use reflection to create a object of that type to see if it implements a certain type of interface. If the record being processed does implement that interface then I know that the RecordId for that record in the Publication table is not a PK in the Set() but rather a FK.
this code works fine when I am going after the PK values for EntityTypes that do not inherit the specific interface.
object authoringRecordVersion = PublishingFactory.AuthoringContext.Set(recordType.Entity.GetType()).Find(record.RecordId);
Problem:
DbContext.Set(EntityType).Find(PK) goes after the PrimaryKey value. How can I tell Set() to search like this sudo code example since 'Where' is not allowed
object authoringRecordVersion = PublishingFactory.AuthoringContext.Set(recordType.Entity.GetType()).Where(c => c.HeaderRecordId == record.RecordId)
Update:
I am working on Implementing the following. Will advise results tomorrow
var sql = "SELECT * from " + record.Entity + " WHERE HeaderRecordId = '" + record.RecordId + "'";
authoringRecordVersion = PublishingFactory.AuthoringContext.Set(recordType.Entity.GetType()).SqlQuery(sql).AsNoTracking();
.SqlQuery(sql).AsNoTracking();
does work effectively. Don't know why I didn't see this earlier.
i've a trouble with linq, i'll explain on example :
i have a database table called Employee which got FirstName and LastName columns,
and a method to search employees which gets a nameList list as argument, the elements in this list are names formatted like this one "Fred Burn", or this1 "Grim Reaper",
already tryed these approaches with no luck =[
//just all employees
var allData = from emp in Context.Employee select emp;
var test1 = from emp in allData
where(emp.FirstName + " " + emp.LastName).Contains
("" + ((from n in nameList select n).FirstOrDefault()))
select emp;
var test2 = (from emp in allData
where (emp.FirstName + " " + emp.LastName)
== ((from n in nameList select n).FirstOrDefault())
select emp);
var test3 = from emp in allData
where (from n in nameList select n).Contains
(emp.FirstName + " " + emp.LastName)
select emp;
first and second queries give : {"Unable to create a constant value of type 'Closure type'. Only primitive types ('such as Int32, String, and Guid') are supported in this context."} exceptionand third : {"LINQ to Entities does not recognize the method 'Boolean Contains[String](System.Collections.Generic.IEnumerable`1[System.String], System.String)' method, and this method cannot be translated into a store expression."}
would be glad to hear your suggestions :)
Thank You!
p.s.
yea i know it's possible to split names in list and compare them separately, but still curious why wont these queries work.
I assume nameList in this case is an in memory collection and that you are trying to use the LINQ to SQL trick creating a SQL "IN" clause inside of the Entity Framework. Unfortunately, EF doesn't support this syntax (yet). Depending on the number of records you are trying to match, you may be able to run separate queries for each child you are desiring. Alternatively, you could build an entitysql query using concatenation to append the multiple items from the nameList as separate OR clauses in the WHERE operation.
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, ','))"))