select rows from datatable using linq query
Copying Rows from One DataTable to Another
Ngày tải lên :
28/10/2013, 18:15
... 5.1 Copying Rows from One DataTable to Another
Problem
You have records in a DataTable that you need to copy to another DataTable.
Solution
Use the ImportRow( ) method of the DataTable to ... of the DataTable
using the row index.
•
Use the Select( ) method of the DataTable.
•
Use the RowFilter property of a DataView for the DataTable.
The sample code creates a source DataTable ... DataRow objects from one
DataTable to another. Three techniques for selecting records to copy are demonstrated in
the following example:
•
Use the Rows property to access rows in the DataRowCollection...
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Tài liệu Using Stored Procedures to Add, Modify, and Remove Rows from the Database phần 1 pdf
Ngày tải lên :
14/12/2013, 13:15
... SqlDataAdapter();
mySqlDataAdapter.SelectCommand = mySelectCommand;
The SELECT statement is then run when you call the mySqlDataAdapter object's Fill()
method to retrieve rows from the Products table ... DataAdapter.
Using Stored Procedures to Add, Modify, and Remove Rows from the Database
You can get a DataAdapter object to call stored procedures to add, modify, and remove
rows from the database. ... object containing a SELECT
statement and sets the SelectCommand property of a SqlDataAdapter to that
SqlCommand:
SqlCommand mySelectCommand = mySqlConnection.CreateCommand();
mySelectCommand.CommandText...
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Tài liệu Using Stored Procedures to Add, Modify, and Remove Rows from the Database phần 2 doc
Ngày tải lên :
14/12/2013, 13:15
...
Calling myDataTable.NewRow()
myNewDataRow.RowState = Detached
Calling myDataTable .Rows. Add()
myNewDataRow.RowState = Added
Calling mySqlDataAdapter.Update()
numOfRows = 1
myNewDataRow.RowState ... the Add() method through the Rows property
// to add the new DataRow to the DataTable
Console.WriteLine("Calling myDataTable .Rows. Add()");
myDataTable .Rows. Add(myNewDataRow);
Console.WriteLine("myNewDataRow.RowState ... int numOfRows = mySqlDataAdapter.Update(myDataTable);
mySqlConnection.Close();
Console.WriteLine("numOfRows = " + numOfRows);
Console.WriteLine("myRemoveDataRow.RowState...
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Chapter 3 - LINQ Query Operators
Ngày tải lên :
12/01/2013, 16:18
... Sugar
•
Language query operators translate
directly to LINQ query operators
•
Query operators can be mixed:
int cnt =
(from i in Enumerable.Range(0, 100)
where i % 2 == 0
select i).Count(i ... cust.Id
select new { cust.Name, order.Amount };
© Copyright SELA Software & Education Labs Ltd. 14-18 Baruch Hirsch St. Bnei Brak 51202 Israel
Standard LINQ Query Operators
•
LINQ query operators ... Israel
Language Query Operators
•
Language query operators are language
keywords that are mapped to query
operators
–
Not all query operators are accessible via keywords
•
C# integrated query operators:
–
Projection:...
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Using LINQ to DataSet
Ngày tải lên :
03/10/2013, 00:20
... data into
a LINQ query.
Dwonloaded from: iDATA.ws
Chapter 18 Using LINQ to DataSet
313
Chapter 18 Quick Reference
To Do This
Include a DataTable instance in a LINQ query Call the DataTable object’s ... of a LINQ query
Cast type-neutral column values as strongly typed query values
LINQ processes data from a variety of sources, but those sources must first be expressed in a
form that LINQ ... Chapter 18 Using LINQ to DataSet
309
with data from external sources, you must bring any data you plan to include in a LINQ
query into the relevant DataTable instances before...
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Using LINQ to Entities
Ngày tải lên :
03/10/2013, 00:20
...
ObjectQuery that will feed data into LINQ.
Dwonloaded from: iDATA.ws
Chapter 19 Using LINQ to Entities
321
The grid displays content from the Customer and OrderEntries entities, plus a column
from ... Queries with LINQ to Entities
As with all LINQ providers, the general structure of LINQ to Entities queries varies only a little
from the LINQ to Objects standard. In fact, looking at a LINQ to Entities ... remotely run SQL
statement. While other LINQ providers can be mixed—Chapter 18, Using LINQ to DataSet,”
combined LINQ to Objects and LINQ to DataSet content LINQ to Entities imposes restric-
tions...
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Using LINQ to SQL
Ngày tải lên :
03/10/2013, 00:20
... function within a LINQ query.
Dwonloaded from: iDATA.ws
Chapter 20 Using LINQ to SQL
335
C#
using (SalesOrderLink context = new SalesOrderLink(connectionString))
{
var results = from cu in context.Customers
...
chapter.
Dwonloaded from: iDATA.ws
Chapter 20 Using LINQ to SQL
333
Using LINQ to SQL, especially when building models with its visual designer, is straightforward
and often much quicker than setting up a LINQ ... context.AgedInvoices(whichCustomer, 90)
Dwonloaded from: iDATA.ws
Chapter 20 Using LINQ to SQL
343
Summary
This chapter introduced the LINQ to SQL query provider. Although it shares many features
with LINQ to Entities, its...
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Tài liệu Reading Rows from a SqlDataReader Object docx
Ngày tải lên :
21/01/2014, 07:20
... get the column values from your DataReader.
Let's take a look at some code that uses the GetOrdinal() method to obtain the positions
of the columns from the example SELECT statement:
int ... performance and flexibility.
Warning When you've finished reading the rows from your DataReader object, close it
using the Close() method. The reason for this is that a DataReader object ...
Listing 9.1: USINGCOLUMNORDINALS.CS
/*
UsingColumnOrdinals.cs illustrates how to use the GetOrdinal()
method of a DataReader object to get the numeric positions of
a column
*/
using System;...
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Tài liệu Báo cáo khoa học: "Extracting Comparative Entities and Predicates from Texts Using Comparative Type Classification" pptx
Ngày tải lên :
20/02/2014, 04:20
... performance.
Next, we did experiments using all of the
continuous lexical sequences and using all of the
POS tags sequences within a radius of n words
from each CK as features (n=1,2,3,4,5). ... of EMNLP’03.
Seon Yang and Youngjoong Ko. 2009. Extracting
Comparative Sentences from Korean Text
Documents Using Comparative Lexical Patterns and
Machine Learning Techniques. In Proceedings ... each
probability value of all CE-candidates using SVM.
For example, if a sentence has three “P”s, one “P”
with the highest probability value is selected as the
answer PR.
5 Experimental Evaluation...
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Tài liệu Báo cáo khoa học: "Knowledge Acquisition from Texts : Using an Automatic Clustering Method Based on Noun-Modifier Relationship" pptx
Ngày tải lên :
22/02/2014, 03:20
... obtained
from the two different data sets.
4 The conceptual analysis : the
LEXICLASS software
LEXICLASS is a clustering tool written using C lan-
guage and specialised data analysis functions from ... filtering method 2 and clustering
algorithm are applied in both cases.
Table 1 shows an extract from the first data set.
The columns are labelled by the expansions (nominal
or adjectival) of ... on the data of ta-
ble 1 leads him to define conceptual fields. Figure 1
shows the transition from an automatically found
cluster to a conceptual field : the KE constitutes
the conceptual...
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Báo cáo khoa học: "Weakly-Supervised Acquisition of Open-Domain Classes and Class Attributes from Web Documents and Query Logs" pot
Ngày tải lên :
08/03/2014, 01:20
... period, symptoms, ]
Query logs Web documents
(1)
(2)
Figure 1: Overview of weakly-supervised extraction of
class instances, class labels and class attributes from Web
documents and query logs
study ... necessarily labeled,
from unstructured text. The extraction proceeds
either iteratively by starting from a few seed ex-
traction rules (Collins and Singer, 1999), or by
mining named entities from comparable ... they should contain, and from
which resources the instances should be collected.
5 Conclusion
In a departure from previous approaches to large-
scale information extraction from unstructured text
on...
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Tài liệu Retrieve Results from SQL Server by Using the DataTable Object docx
Ngày tải lên :
26/01/2014, 11:20
... control are assigned.
Comments
Using the data table sets up the scene for using the list box in retrieving data in the next
How-To. Remember: By using the DataTable object, you can assign ... OleDb.OleDbDataAdapter
Dim dtCust As DataTable = New DataTable( )
Dim strSQL As String
' Create the SQL String
strSQL = " ;Select CustomerID, CompanyName From Customers " & _ ... with a
Try-Catch-End-Try block of code.
Listing 3.3 frmHowTo3_2.vb: Loading a List Box By Using the DataTable
Object
Private Sub btnLoadList_Click(ByVal sender As System.Object,
ByVal e As...
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Tài liệu Retrieve Unique Records Using Only a Select Query docx
Ngày tải lên :
26/01/2014, 11:20
...
Sub GenerateData(ByVal blnUseDistinct As Boolean)
6.1 Retrieve Unique Records Using Only a Select Query
I need to figure out which customers have invoices. The problem is that when I ...
because this is the default. You will create two SELECT statements for this task. The first
one is for all records:
SELECT Customers.CompanyName FROM Customers INNER JOIN Orders ON
Customers ... clause:
SELECT DISTINCT Customers.CompanyName
FROM Customers
INNER JOIN Orders ON Customers.CustomerID = Orders.CustomerID
Steps
Open and run the Visual Basic .NET-Chapter 6 solution. From the...
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Sử dụng Query Select để thống kê dữ liệu
Ngày tải lên :
01/09/2012, 09:08
... ở chế độ Append From) .
ã
Tạo truy vấn Select Query trên một bảng cần
ghép nối các bản ghi vào bảng khác.
ã
Chọn Query/ Append Query (hoặc chọn biểu
tượng Query Type/ Append Query) .
ã
Chọn bảng ... thực hiện một Query
thống kê Select bằng các hàm thống kê.
09/01/12 09:10
HQT-CSDL ACCESSS 2000 - QUERY
b. Sử dụng Simple Query Wizard để thống kê:
B1: Chọn thành phần Create query by using Wizard.
C1: ... thức điều kiện để xoá các bản
ghi.
ã
Chọn Query/ Delete Query (hoặc chọn biểu tư
ợng Query Type/ Delete Query ).
09/01/12 09:10
HQT-CSDL ACCESSS 2000 - QUERY
a. Các hàm thống kê thường dùng:
ã
SUM:...
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