I m developing an windows phone 7 app, i want to auto increment a database value that was created using code first technique.
I tried a following logic to get this done but its resulting in an exception "Method count not supported"
var c = new AccountEntryModel();
Expense exp = new Expense();
if (c.Expenses.Count() == 0)
exp.ExpenseId = 1;
else
exp.ExpenseId = c.Expenses.Max<Expense>(b => b.ExpenseId) + 1;
ExpenseIdTextBox.Text = exp.ExpenseId.ToString();
I tried your code and it worked fine in Windows Phone 7.1
Here is what I tried:
var c = new AccountEntryModel();
Expense exp = new Expense();
if (c.Expenses.Count() == 0)
exp.ExpenseId = 1;
else
exp.ExpenseId = c.Expenses.Max<Expense>(b => b.ExpenseId) + 1;
And here are the classes I created on my assumptions from your code above:
public class Expense
{
public int ExpenseId { get; set;}
}
public class AccountEntryModel
{
public AccountEntryModel()
{
Expenses = new List<Expense>();
for (int i = 1; i < 10; i++)
{
Expenses.Add(new Expense { ExpenseId = i });
}
}
public List<Expense> Expenses { get; set;}
}
Related
I want in SQL prepared dynamic query based on the shortcode.
For Eg.
DECLARE #ShortCode VARCHAR(MAX)
SET #ShortCode = '[User data="Name" data="MobileNumber"]';
User = table name
Name = User table field
MobileNumber = User table field
Query output be like
SELECT [Name],[MobileNumber] FROM [dbo].[User]
SET #ShortCode = '[Country data="Name" ID="1"]';
Country = table name
Name = Country table field
ID = User table field
Query output be like
SELECT [Name] FROM [dbo].[Country] WHERE [ID] = 1
How to extract all data attributes values and how to get User in the []
This functionality is done in C#
Here My c# code
// Model class
public class ShortCodeResult
{
public Guid? ID { get; set; }
public string TableName { get; set; }
public bool IsValidShortCode { get; set; }
public string Message { get; set; }
public Dictionary<string,object> KeyValue { get; set; }
public ShortCodeResult() {
KeyValue = new Dictionary<string, object>();
ID = Guid.NewGuid();
}
}
//Regex Filter
public class RegexFilter
{
private string oPattern = #"(\w+)=[\""]([a-zA-Z0-9_.:\""]+)";
public ShortCodeResult GetShortCodeValues(string Code)
{
var oShortCodeModel = new ShortCodeResult();
var oRegex = new Regex(oPattern, RegexOptions.IgnoreCase);
var oTableNameRegex = Regex.Match(Code, #"\b[A-Za-z]+\b", RegexOptions.Singleline).Value;
var lstMatchCollection = oRegex.Matches(Code).Cast<Match>().Where(x=>x.Value.StartsWith("data")).ToList();
if (lstMatchCollection != null && lstMatchCollection.Count > 0)
{
for (int i = 0; i < lstMatchCollection.Count; i++)
{
var oSelected = new Regex("[^=]+$").Match(Convert.ToString(lstMatchCollection[i]));
if (oSelected != null)
{
oShortCodeModel.KeyValue.Add(i.ToString(), oSelected.Value.Trim('"'));
}
}
}
oShortCodeModel.TableName = oTableNameRegex;
return oShortCodeModel;
}
}
//HtmlHelper Extension
public static MvcHtmlString RenderShortCode(this HtmlHelper htmlHelper, string IdOrExprssion)
{
#region Get short code data
var oShortCode = ShortCodeHelper.GetShortCode(IdOrExprssion);
#endregion
var oMvcHtmlString = new MvcHtmlString(IdOrExprssion);
var oRegexFilter = new RegexFilter();
var shortCodeModel = oRegexFilter.GetShortCodeValues(oShortCode.Expression);
var ostringBuilder = new StringBuilder();
if (!string.IsNullOrEmpty(shortCodeModel.TableName))
{
ostringBuilder.AppendLine("SELECT ");
ostringBuilder.AppendLine((shortCodeModel.KeyValue.Count > 0 ? string.Join(",", shortCodeModel.KeyValue.Select(x => x.Value)) : "*"));
ostringBuilder.AppendLine(" FROM ");
ostringBuilder.AppendLine(oShortCode.TableName);
ostringBuilder.AppendLine(" WITH(NOLOCK) ");
if (oShortCode.FilterCode.Count() > 0)
{
ostringBuilder.AppendLine("WHERE ");
foreach (var filterCode in oShortCode.FilterCode)
{
ostringBuilder.AppendLine(filterCode.FilterColumnName);
ostringBuilder.AppendLine(filterCode.Operator);
ostringBuilder.AppendLine(filterCode.FilterColumnValue);
}
}
}
var oDyanamicData = DBHelper.GetDataTable(ostringBuilder.ToString(), System.Data.CommandType.Text, new List<SqlParameter>());
if (oDyanamicData != null)
{
if (oShortCode.IsHtmlRender)
{
for (int i = 0; i < oDyanamicData.Rows.Count; i++)
{
for (int j = 0; j < oDyanamicData.Columns.Count; j++)
{
string key = Convert.ToString(oDyanamicData.Columns[j]);
string value = Convert.ToString(oDyanamicData.Rows[i].ItemArray[j]);
if (oShortCode.DisplayCode.Count > 0)
{
var displayCode = oShortCode.DisplayCode.FirstOrDefault(x => x.DisplayColumnName == key);
if (displayCode != null && !string.IsNullOrEmpty(displayCode?.ReplaceKey))
{
oShortCode.DefinedHtml = oShortCode.DefinedHtml.Replace(displayCode.ReplaceKey, value);
}
}
}
}
return new MvcHtmlString(oShortCode.DefinedHtml);
}
else
{
string key = string.Empty, value = string.Empty;
#region For Json
List<JObject> dataList = new List<JObject>();
for (int i = 0; i < oDyanamicData.Rows.Count; i++)
{
JObject eachRowObj = new JObject();
for (int j = 0; j < oDyanamicData.Columns.Count; j++)
{
key = Convert.ToString(oDyanamicData.Columns[j]);
value = Convert.ToString(oDyanamicData.Rows[i].ItemArray[j]);
eachRowObj.Add(key, value);
}
dataList.Add(eachRowObj);
}
return new MvcHtmlString(Newtonsoft.Json.JsonConvert.SerializeObject(dataList));
#endregion
}
}
return oMvcHtmlString;
}
Can anyone help me solved above in SQL server or prepared query in store procedure
select case statement in linq query.
Here is the query on sql:
select case when DATEDIFF(day,convert(varchar,Min([Order].CreatedOnUtc),101),convert(varchar,Max([Order].CreatedOnUtc),101)) = 0 then
Sum([Order].OrderSubtotal)
else
case when (DATEDIFF(day,convert(varchar,Min([Order].CreatedOnUtc),101),convert(varchar,Max([Order].CreatedOnUtc),101))/30) = 0 then Sum([Order].OrderSubtotal) else
Sum([Order].OrderSubtotal)/
(DATEDIFF(day,convert(varchar,Min([Order].CreatedOnUtc),101),convert(varchar,Max([Order].CreatedOnUtc),101))/30)
end
end as 'Account Value' from [order] where And Account.ID = #Act_ID
I am trying the code here:
var query = _orderRepository.Table;
query = query.Where(o => o.AccountId == accountId);
In query i am getting my value.
After query statement what should i write??
how do i write for case statement using linq???
#Manoj, may be the below code helps you. This sample C# project may solve the problem you have.
using System;
using System.Collections.Generic;
using System.Linq;
namespace DateDiffIssue
{
class Program
{
static void Main(string[] args)
{
// Preparing data
var data = new Order[] {
new Order { AccountID = 1, CreatedOnUtc = DateTime.Parse("1.01.2017 10:00"), OrderSubtotal = 100 },
new Order { AccountID = 1, CreatedOnUtc = DateTime.Parse("1.01.2017 12:00"), OrderSubtotal = 150 },
new Order { AccountID = 1, CreatedOnUtc = DateTime.Parse("1.01.2017 14:00"), OrderSubtotal = 150 }
};
// Selection
var selected = (from item in data
let accountData = data.Where(w => w.AccountID == 1)
let minDate = accountData.Min(m => m.CreatedOnUtc).Date
let maxDate = accountData.Where(w => w.AccountID == 1).Max(m => m.CreatedOnUtc).Date
let isSameDate = minDate == maxDate
let basedOn30Days = (maxDate - minDate).TotalDays / 30
let isInside30Days = (int)basedOn30Days == 0
let accountDataSum = accountData.Sum(s => s.OrderSubtotal)
select new
{
AccountValue = isSameDate ? accountDataSum :
isInside30Days ? accountDataSum :
accountDataSum / basedOn30Days
}).Distinct();
// Print each order
selected.ToList().ForEach(Console.WriteLine);
// Wait for key
Console.WriteLine("Please press key");
Console.ReadKey();
}
}
internal class Order
{
public int AccountID { get; set; }
public DateTime CreatedOnUtc { get; set; }
public int OrderSubtotal { get; set; }
}
}
I am am trying to call a variable in another method to my array.
var Com = the difficulty for the game. But the method below I'm trying to call the var Com, for: var c = Com.GetChoice();
Not sure why I can not figure out how to call it.
public object SetDiff()
{
Console.WriteLine("Enter difficulty #: (1 = Easy, 2 = Normal, 3 = Impossible)");
var diff = Console.ReadLine();
int mode;
int.TryParse(diff, out mode);
if (mode == 1)
{
Console.Clear();
var Com = new Easy();
return Com;
}
if (mode == 2)
{
Console.Clear();
var Com = new Medium();
return Com;
}
if (mode == 3)
{
Console.Clear();
var Com = new Hard();
return Com;
}
else
{
Console.WriteLine("That is not a valid input.");
return SetDiff();
}
} // Apparently you can't set variables in a switch.
public int[] FaceOff(int num)
{
int PlayerWin = 0;
int ComWin = 0;
int Tie = num + 1;
// TODO : Get rid of TIES!
for (int i = 0; i < num; i++)
{
var p = p1.GetChoice();
var c = Com.GetChoice();
You have many different options:
Pass as parameter
public int[] FaceOff(int num, int Com){...}
make a "global" variable
private int Com;
I would also recommend you to learn OOP (Object Orientated Programming) basics.
I am using script component in ssis with C# code using Microsoft.Analysisservices namespace to fetch the cube metadata. The code looks somewhat like this
using System;
using System.Data;
using Microsoft.SqlServer.Dts.Pipeline.Wrapper;
using Microsoft.SqlServer.Dts.Runtime.Wrapper;
using Microsoft.AnalysisServices;
using System.Windows.Forms;
[Microsoft.SqlServer.Dts.Pipeline.SSISScriptComponentEntryPointAttribute]
public class ScriptMain : UserComponent
{
//IDTSConnectionManager100 connMgr;
Server OLAPServer = new Server();
public override void AcquireConnections(object Transaction)
{
OLAPServer.Connect(this.Connections.OLAPConnection.ConnectionString);
}
public override void PreExecute()
{
base.PreExecute();
/*
Add your code here for preprocessing or remove if not needed
*/
}
public override void PostExecute()
{
base.PostExecute();
/*
Add your code here for postprocessing or remove if not needed
You can set read/write variables here, for example:
Variables.MyIntVar = 100
*/
}
public override void CreateNewOutputRows()
{
IDTSVariables100 vars = null;
string OLAPDBName;
VariableDispenser.LockOneForRead("OLAPDBName", ref vars);
Database OLAPDB;
OLAPDBName = vars[0].Value.ToString();
try
{
OLAPDB = OLAPServer.Databases.GetByName(OLAPDBName);
}
catch
{
return;
}
// loop through cubes
CubeCollection Cubes = OLAPDB.Cubes;
MeasureGroupCollection Mgroups;
CubeDimensionCollection Dimensions;
MeasureGroupDimensionCollection MgroupDims;
DimensionAttributeCollection Attributes;
foreach (Cube cb in Cubes)
{
//Test for one Measure Group
//MeasureGroup mgroup = Mgroups.GetByName("Inward Exposure");
Mgroups = cb.MeasureGroups;
// all dimensions associated with that Measure Group
// loop through Measure Groups
foreach (MeasureGroup mg in Mgroups)
{
// loop though all cube dimensions
Dimensions = cb.Dimensions;**strong text**
foreach (CubeDimension dim in Dimensions)
{
bool CanBeAnalysed = false;**strong text**
// loop through dimensions and see if dimension exists in mgroupDims (ie check if it can be analysed)
MgroupDims = mg.Dimensions;
foreach (MeasureGroupDimension mgd in MgroupDims)
{
if (mgd.CubeDimension == dim)
{
CanBeAnalysed = true;
break;
}
}
// loop through each Measure and Attribute a
String DimName = dim.Name;
bool DimVisible = dim.Visible;
String MgroupName = mg.Name;
String CubeName = cb.Name;
String MeasureExpression;
String Description;
// for every attribute in dimension
Attributes = dim.Dimension.Attributes;
foreach (DimensionAttribute Attr in Attributes)
{
String AttrName = Attr.Name;
bool AttrVisible = Attr.AttributeHierarchyVisible;
String AttrNameColumn = Attr.NameColumn.ToString();
String AttributeRelationship = Attr.AttributeRelationships.ToString();
// get every measure in measuregroup
foreach (Measure m in mg.Measures)
{
String MeasureName = m.Name.ToString();
bool MeasureVisible = m.Visible;
String MeasureNameColumn = m.Source.ToString();
if (m.MeasureExpression != null)
{
// MessageBox.Show(m.MeasureExpression.ToString());
MeasureExpression = m.MeasureExpression.ToString();
}
else
{
// MessageBox.Show(m.MeasureExpression.ToString());
MeasureExpression = " " ;
}
if (m.Description != null)
{
// MessageBox.Show(m.MeasureExpression.ToString());
Description = m.Description.ToString();
}
else
{
// MessageBox.Show(m.MeasureExpression.ToString());
Description = " ";
}
Output0Buffer.AddRow();
Output0Buffer.OLAPDBName = OLAPDBName;
Output0Buffer.CubeName = CubeName;
Output0Buffer.DimensionName = DimName;
Output0Buffer.DimensionVisible = DimVisible;
Output0Buffer.AttrDDSColumn = AttrNameColumn;
Output0Buffer.AttrName = AttrName;
Output0Buffer.AttrVisible = AttrVisible;
Output0Buffer.MeasureGroupName = MgroupName;
Output0Buffer.MeasureName = MeasureName;
Output0Buffer.MeasureVisible = MeasureVisible;
Output0Buffer.MeasureDDSColumn = MeasureNameColumn;
Output0Buffer.IsAnalysable = CanBeAnalysed;
Output0Buffer.MeasureExpression = MeasureExpression;
Output0Buffer.Description = Description;
Output0Buffer.AttributeRelationship = AttributeRelationship;
}
}
} // end of Cube Dim Loop
} // end of Measure Group loop
} // end of cube loop
}
}
I was successful in getting the cube metadata with the above code.However, i am stuck at getting the metadata of the perspective cube and the Relationships of the measure groups i.e whether the measure groups are many-many. Any help is very much appreciated.
Here is some code for detecting dimension relationships including many-to-many. See the GetDimensionUsage function:
https://raw.githubusercontent.com/BIDeveloperExtensions/bideveloperextensions/master/SSAS/PrinterFriendlyDimensionUsage.cs
Here is some code around navigating perspectives:
https://raw.githubusercontent.com/BIDeveloperExtensions/bideveloperextensions/master/SSAS/TriStatePerspectivesPlugin.cs
Start reading around the following line:
if (perspective.MeasureGroups.Contains(mg.Name))
newbie here, sorry if this is an obvious question.
It seems saving different types of objects in the same session breaks batching, cause significant performance drop.
ID generator is set to Increment (as Diego Mijelshon advised, I tried hilo("100"), but unfortunately same issue, Test1() is still about 5 times slower than Test2()):
public class CustomIdConvention : IIdConvention
{
public void Apply(IIdentityInstance instance)
{
instance.GeneratedBy.Increment();
}
}
AdoNetBatchSize is set to 1000:
MsSqlConfiguration.MsSql2008
.ConnectionString(connectionString)
.AdoNetBatchSize(1000)
.Cache(x => x
.UseQueryCache()
.ProviderClass<HashtableCacheProvider>())
.ShowSql();
These are the models:
public class TestClass1
{
public virtual int Id { get; private set; }
}
public class TestClass2
{
public virtual int Id { get; private set; }
}
These are the test methods. Test1() takes 62 seconds, Test2() takes only 11 seconds. (as Phill advised, I tried stateless sessions, but unfortunately same issue):
[TestMethod]
public void Test1()
{
int count = 50 * 1000;
using (var session = SessionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
for (int i = 0; i < count; i++)
{
var x = new TestClass1();
var y = new TestClass2();
session.Save(x);
session.Save(y);
}
transaction.Commit();
}
}
}
[TestMethod]
public void Test2()
{
int count = 50 * 1000;
using (var session = SessionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
for (int i = 0; i < count; i++)
{
var x = new TestClass1();
session.Save(x);
}
transaction.Commit();
}
}
using (var session = SessionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
for (int i = 0; i < count; i++)
{
var y = new TestClass2();
session.Save(y);
}
transaction.Commit();
}
}
}
Any ideas?
Thanks!
Update:
The test project can be downloaded from here. You need to change the connectionString in the Main method. I changed all sessions to stateless sessions.
My restuls: Test1 = 59.11, Test2 = 7.60, Test3 = 7.72. Test1 is 7.7 times slower than Test2 & Test3!
Do not use increment. It's the worst possible generator.
Try changing it to HiLo.
Update:
It looks like the problem occurs when alternating saves of different entities, regardless of whether the session/transaction are separated or not.
This produces similar results to the second test method:
[TestMethod]
public void Test3()
{
int count = 50 * 1000;
using (var session = SessionFactory.OpenSession())
{
using (var transaction = session.BeginTransaction())
{
for (int i = 0; i < count; i++)
{
var x = new TestClass1();
session.Save(x);
}
for (int i = 0; i < count; i++)
{
var y = new TestClass2();
session.Save(y);
}
transaction.Commit();
}
}
}
My guess, without looking at NH's sources, is that it preserves the order because of possible relationships between the entities, even when there are none.
When you run test2 and test3, the insert's are batched together.
When you run test1, where you alternate the inserts, the inserts are issued as separate statements and are not batched together.
I found this out by profiling all three tests.
So as per Diego's answer, it must preserve the order that you're inserting, and batch them together.
I wrote a 4th test, I set the batch size to 10, then alternated when i changed from TestClass1 to TestClass2 so that I was doing 5 of TestClass1 and then 5 of TestClass2, to hit the batch size.
This pushed out batch's of 5 in the order they were processed.
public void Test4()
{
int count = 10;
using (var session = SessionFactory.OpenSession())
using (var transaction = session.BeginTransaction())
{
for (int i = 0; i < count; i++)
{
if (i%2 == 0)
{
for (int j = 0; j < 5; j++)
{
var x = new TestClass1();
session.Save(x);
}
}
else
{
for (int j = 0; j < 5; j++)
{
var y = new TestClass2();
session.Save(y);
}
}
}
transaction.Commit();
}
}
Then I changed it to insert 3 at a time instead of 5. The batch's were in multiples of 3, so what must be happening is the batch size allows a batch of 1 type to go to specified amount, but groups only the same type together. While alternating causes separate insert statements.