select rows from datatable using linq query

... 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...

Ngày tải lên: 28/10/2013, 18:15

... 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...

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...

Ngày tải lên: 14/12/2013, 13:15

... 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:...

Ngày tải lên: 12/01/2013, 16:18

... 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...

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...

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...

Ngày tải lên: 03/10/2013, 00:20

... 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;...

Ngày tải lên: 21/01/2014, 07:20

... 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...

Ngày tải lên: 20/02/2014, 04:20

... 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...

Ngày tải lên: 22/02/2014, 03:20

... 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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Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 18/06/2014, 16:20

Ngày tải lên: 20/07/2014, 12:47

... 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...

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...

Ngày tải lên: 26/01/2014, 11:20

... 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:...

Ngày tải lên: 01/09/2012, 09:08