I am using Devextreme loadoptions with Ignite CacheQueryable it is working fine with Grid get all data request but throwing exception when I select filter on grid's column.
"Message": "42000: Failed to parse query. Column "_T0.I0" not found; SQL statement: select count (_T0.*) , _T0.I0 from "Data".ABC as _T0 group by (_T0.FILENAME) order by (_T0.I0) asc limit ? [42122-197]".
It is a bug in Ignite, I've filed a ticket: IGNITE-17842.
Devextreme generates the following expression:
queryable
.GroupBy(obj => new { I0 = obj.Filename })
.OrderBy(g => g.Key.I0)
.Select(g => new { I0 = g.Count(), I1 = g.Key.I0 })
.Take(20);
The problem is GroupBy(obj => new { I0 = obj.Filename }), Ignite does not (yet) support grouping by an anonymous type. It would work as GroupBy(obj => obj.Filename).
Related
How can i dynamically change the selected columns in the generated sql query when using a linq expression?
Its a new session for each time the query is executed.
Even when I set the MapExp as null after first creation an then changing the bool value to false, it still generates the column in the sql query.
The code runs in a wpf application.
System.Linq.Expressions.Expression<Func<Entity, Model>> MapExp = x => new Model
{
Id=xId,
Count= LoadFormulaField ? x.Count: null,
...
};
var result = session.Query<Entity>().Select(MapExp))
Your problem seems to be the ternary-conditional as part of the expression which is causing the "Count" column to always be queried.
One option to avoid this could be:
var query = session.Query<Entity>();
IQueryable<Model> result = null;
if (LoadFormulaField)
{
result = query.Select(x => new Model
{
Id = x.Id,
Count = x.Count,
});
}
else
{
result = query.Select(x => new Model
{
Id = x.Id,
});
}
Which would get a little less ugly if you separate in a couple of methods I think.
Still trying to get familiar with scalikejdbc. What is the simplest way to just use sql syntax to send a query using scalike jdbc into a table to get max date? Something really simple like the below works fine but gives me an error when I try to add max around the column.
val maxDate: Option[String] = DB readOnly { implicit session =>
sql"select <column> from <table>"
.map(rs => rs.string("<column")).first.apply()
}
this does not work:
val maxDate: Option[String] = DB readOnly { implicit session =>
sql"select max(<column>) from <table>"
.map(rs => rs.string("<column")).first.apply()
}
error:
Failed to retrieve value because The column name not found.. If you're using SQLInterpolation,...
I expect this happens because column max(MyColumn) does not have name "MyColumn" by default. You may try something like this instead
val maxDate: Option[String] = DB readOnly { implicit session =>
sql"select max(MyColumn) as MyColumn_max from MyTable"
.map(rs => rs.string("MyColumn_max")).first.apply()
}
I have 2 linq queries. First query does nothing because of unique index and this is OK. But second also does nothing while it should add records . If I bypass first query second query works. Should I refresh entity ? How ?
foreach (var product in productList)
{
cc2nexo_SubiektProduct newproduct = new cc2nexo_SubiektProduct();
newproduct.Name = product.Name;
newproduct.VAT = product.VAT;
newproduct.Id = product.Id;
foreach (var stawkaVAT in myNexo_ExitoEntities.StawkiVat)
{
if (stawkaVAT.Stawka * 100 == tryconvert_dec(newproduct.VAT))
{
newproduct.VAT_Id = stawkaVAT.Id;
}
}
myNexo_ExitoEntities.cc2nexo_SubiektProduct.Add(newproduct);
SurroundWithTryCatchDB(() =>
{
myNexo_ExitoEntities.SaveChanges();
});
}
var orders = (from myorders in myNexo_ExitoEntities.temp_SubiektOrderList
select myorders).ToList();
foreach (var order in orders)
{
cc2nexo_SubiektOrderList neworder = new cc2nexo_SubiektOrderList();
neworder.Data_utworzenia_sprawy = tryconvert_date(order.Data_utworzenia_sprawy);
neworder.Data_modyfikacji_sprawy = tryconvert_date(order.Data_modyfikacji_sprawy);
neworder.Data_umowy = tryconvert_date(order.Data_umowy);
neworder.Id = order.Id;
myNexo_ExitoEntities.cc2nexo_SubiektOrderList.Add(neworder);
SurroundWithTryCatchDB(() =>
{
myNexo_ExitoEntities.SaveChanges();
});
Debug.WriteLine(neworder.LastName);
}
I am receiving an error
Cannot insert duplicate key row in object 'dbo.cc2nexo_SubiektProduct' with unique index 'K_ID'. The duplicate key value is (1).The statement has been terminated
The reason of problem was SurroundWithTryCatchDB procedure not listed in my question. Because first query caused exception due to unique index all next SaveChanges did not work. I have changed my first query to work with unique values and now everything is OK.
I'm writing a backup job, and need to fetch all classes in Parse-server, so I can then query all rows and export them.
How do I fetch all classes?
Thanks
Query the schemas collection.
GET /parse/schemas
Probably need to use the masterkey on the query. Not sure what language you're writing your job in but should be simple for you to create a REST query or create a node.js script and use the javascript/node api
--Added after comment below --
var Parse = require('parse/node').Parse;
Parse.serverURL = "http://localhost:23740/parse";
Parse.initialize('APP_ID', 'RESTKEY', 'MASTERKEY');
var Schema = Parse.Object.extend("_SCHEMA");
var query = new Parse.Query(Schema);
query.find({
success : (results) => {
console.log(JSON.stringify(results));
},
error : (err) => {
console.log("err : " + JSON.stringify(err));
}});
How to convert the following sql query to lambda expression?
select cg.Code, ci.ChangeType, SUM(oc.Value) from OtherCharges oc
left join changeitems ci on oc.ChangeItemKey = ci.ChangeItemKey
left join ChangeGroups cg on ci.ChangeGroupKey = cg.ChangeGroupKey
where OtherKey = 'AB235A00-FEB2-4C4F-B0F9-3239FD127A8F'
group by cg.Code, ci.ChangeType
order by cg.Code, ci.ChangeType
Assuming you already have .NET domain types for your tables:
IQueryable<OtherCharges> otherCharges = ...
Guid otherKey = ...
var query = otherCharges.Where(oc => oc.OtherKey == otherKey)
.Select(oc => new { oc.ChangeItem, oc.Value })
.GroupBy(t => new { t.ChangeItem.ChangeGroup.Code, t.ChangeItem.ChangeType })
.OrderBy(g => g.Key.Code)
.ThenBy(g => g.Key.ChangeType)
// note that if Code is a non-nullable type you'll want to cast it to int? at some
// point so that when pulled into memory EF won't complain that you can't cast
// null to a non-nullable type. I expect that Code could sometimes be null here
// do to your use of LEFT OUTER JOIN in the T-SQL
.Select(g => new { g.Key.Code, g.Key.ChangeType, Sum = g.Sum(t => t.Value) });
var inMemoryResult = query.ToList();
Note that I'm using OtherCharge.ChangeItem and ChangeItem.ChangeGroup here. These are association properties and need to be set up as part of your model (e. g. using fluent configuration for EF code first).