... access the XmlDataDocument to perform certain functionality more conveniently than could be accomplished using the DataSet directly To execute an XPath query against the contents of a DataSet, call ... Orders and Order Details data If the Nested property were false, you'd have to use a second XPath queryto retrieve the Order Details data from the XMLDataDocument for the DataSet [ Team LiB ] ... DataSet ds; // private void XPathQueryForm_Load(object sender, System.EventArgs e) { ds = new DataSet("Orders_OrderDetails"); SqlDataAdapter da; // Fill the Order table and add it to the DataSet...
... alternatives toLINQto DataSet LINQto Entities, discussed in Chapter 19, UsingLINQto Entities,” can process external data without the need to load full tables into memory Querying with LINQto DataSet: ... valid data before you make the query When dealing Chapter 18 UsingLINQto DataSet 309 with data from external sources, you must bring any data you plan to include in a LINQquery into the ... Writing Queries with LINQto DataSet With the exception of the new enumerated methods specific toLINQto DataSet, using ADO.NET DataTable objects in LINQ queries is identical tousing standard collection...
... can be mixed—Chapter 18, UsingLINQto DataSet,” combined LINQto Objects and LINQto DataSet content LINQto Entities imposes restrictions on the type of data involved in the queries Note One ... with LINQto Entities As with all LINQ providers, the general structure of LINQto Entities queries varies only a little from the LINQto Objects standard In fact, looking at a LINQto Entities query, ... way to run an ObjectQuery that will feed data into LINQ 316 Chapter 19 UsingLINQto Entities 317 Here is a query that returns some properties from a Customer entity: C# using (SalesOrderEntities...
... tool for applications that need easy access to a specific SQL Server database Comparing LINQto SQL with LINQto Entities The LINQto SQL provider first appeared with the initial release of LINQ, ... with LINQto SQL Chapter 20 UsingLINQto SQL 333 UsingLINQto SQL, especially when building models with its visual designer, is straightforward and often much quicker than setting up a LINQto ... CustomerName = cu.FullName End Using Except for the replacement of an ObjectContext by a DataContext, this query is identical to the first LINQto Entities query included in Chapter 19, Using LINQ...
... intended to contain data Their presence is sufficient to convey meaning, as shown in the following example: 10 Module 9: Using XML to Exchange Data The ... observed when using XML to exchange data ix THIS PAGE INTENTIONALLY LEFT BLANK Module 9: Using XML to Exchange Data # Overview ! Introduction to XML ! Validating XML Documents ! Using the Document ... the following example: to this syntax > Module 9: Using XML to Exchange Data XML Syntax (continued) ! Attributes ...
... thực câu truy vấn thay đổi mà muốn cách dùng LINQto SQL DataContext, tất thay đổi lưu vết lại 36 LINQto SQL Tutorial Ghi chú: Việc lưu vết LINQto SQL xảy bên phía chương trình gọi, không liên ... dòng có CSDL, LINQto SQL cho phép bạn thêm xóa liệu Bạn làm điều việc thêm/bớt đối tượng liệu từ tập hợp bảng 37 LINQto SQL Tutorial lớp DataContext, sau gọi SubmitChanges() LINQto SQL lưu vết ... lệnh LINQ để lấy Product có đơn đặt hàng: Chú ý cách dùng tập hợp “OrderDetails” mà LINQto SQL tạo lớp Product (nhờ vào mối quan hệ một-nhiều mà mô hình hóa trình thiết kế LINQto SQL) 24 LINQ to...
... thấy LINQto SQL lần là: “làm kiểm soát hoàn to n câu lệnh SQL thực thi bên ?” 45 LINQto SQL Tutorial Một tin tốt LINQto SQL có mô hình mềm dẻo, cho phép nhà phát triển thay câu lệnh củaLINQ to ... hộp thoại đặt cho control mà bạn muốn tạo: 50 LINQto SQL Tutorial Trình thiết kế hiển thị tiếp lớp DataContext LINQto SQL mà ứng dụng bạn dùng bao ... thực thể Product mô hình liệu LINQto SQL, khai báo thẻ trang trỏ vào lớp datacontext LINQto SQL, thực thể (ví dụ: Products) mô hình LINQto SQL mà muốn gắn nối Tôi cho...
... thi hàm UDF chạy: 76 LINQto SQL Tutorial Tổng kết LINQto SQL supports the ability to call Stored Procedures and UDFs within the database and nicely integrate them into our data model In this ... với dự án Các bước ánh xạ gọi SPROC dùng LINQto SQL Trong phần 2, nói cách dùng LINQto SQL designer để tạo mô hình liệu LINQto SQL đây: 66 LINQto SQL Tutorial Ở cửa sổ có chứa cửa sổ con, cửa ... transaction LINQto SQL đảm bảo thủ tục kiểm tra thực thi cho phép trước liệu cập nhật cách thực sự: VB: 81 LINQto SQL Tutorial C#: LINQto SQL theo dõi thay đổi mà tạo đối tượng lấy từ DataContext,...
... dụ, bạn cần gán giá trị thuộc tính Customer.CustomerID "mới" vào 88 LINQto SQL Tutorial cho tham số @CustomerID @original_customerID SPROC, Customer.CustomerID "gốc" vào cho Khi nhấn "Ok" ửa ... với LINQ dùng LinqDataSource, cách bạn dùng biểu thức LINQ để thực truy vấn với Tóm tắt: dùng với mệnh đề where khai báo Trong viết biểu diễn cách bạn dùng lọc có sẵn LinqDataSource ... LINQto SQL Tutorial Ở trên, bạn chọn chế độ ("Use Runtime") LINQto SQL tính to n sinh câu lệnh SQL động để thực thao tác tương ứng Chúng ta thay đổi cách nhấn chuột vào Customize chọn...
... Mapping Your Objects to Database Tables with LINQto SQL Table of Contents Mapping Your Objects to Database Tables with LINQto SQL Exercise Creating Your First LINQTO SQL Application ... how to access relational datausingLINQto SQL You will start by creating an object model for the Northwind database, and then use the object model to access the database using the new C# 3.0 query ... 27 Mapping Your Objects to Database Tables with LINQto SQL Mapping Your Objects to Database Tables with LINQto SQL Objectives Scenario Estimated Time to Complete This Lab After completing...
... Data Island Use XML-aware browsers to process XML data on the client A common technique is to store the data in an XML data island on the Web page, and bind data controls to the XML data by using ... Using ADO to Access XML Data 31 Best Practices Topic Objective To identify best practices for using ADO to retrieve XML data Lead-in Keep in mind the following best practices when using ADO to ... objStrmResults Module 4: Using ADO to Access XML Data 15 Executing a Query Topic Objective To describe how to execute an XML query Lead-in After all properties have been set, the query can be executed...
... Module 3: Using ADO.NET to Access DataUsing DataViews Topic Objective To explain the role of DataViews in accessing data from a database by using DataSets Lead-in To access data from a DataSet, ... ONLY 10 Module 3: Using ADO.NET to Access Data Connecting to a Data Source Topic Objective To describe how to connect to a data source by using ADO.NET Lead-in Connecting to a data source is the ... 12 Module 3: Using ADO.NET to Access Data # Accessing Data With DataSets Topic Objective To introduce the topics included in the section ! Using DataSets to Read Data Lead-in ! Storing Multiple...
... 2000 data sources You will also learn how to use a Uniform Resource Locator (URL) queryto test a virtual directory Module 5: Using HTTP to Access XML Data Publishing SQL Server Data over HTTP Topic ... “virtual root” both refer to an IIS virtual directory 2 Module 5: Using HTTP to Access XML Data Enabling HTTP Access to SQL Databases Topic Objective To introduce the topics in this section Lead-in ... 5: Using HTTP to Access XML Data Web sites Many Web sites are used primarily to publish data Allowing access to a SQL Server database through a virtual directory makes it possible to publish data...
... Research data is stored in both XML data stores and relational databases 4 Module 8: Using XQuery to Link and Query XML Documents XQuery and XPath 2.0 The ideas incorporated in XQuery for powerful querying ... an SQL query and a current prototype from Microsoft of a basic query interface Module 8: Using XQuery to Link and Query XML Documents 11 Lesson: Using XQuery ! Basic XQuery ! Advanced XQuery ... 8: Using XQuery to Link and Query XML Documents 15 The Future of XQuery ! The universal query language for XML and Web-based data work ! Opens new possibilities toquery combinations of data stores...
... SanPham using System; using System.Collections.Generic; Microsoft Vietnam – DPE Team | Bài số 7: Dynamic Data với LINQto SQL using System .Linq; using System.Web; using System.Web.DynamicData; using ... Bài DYNAMIC DATA VỚI LINQTO SQL Bài giới thiệu tổng quan Dynamic Data, tính Dynamic Data Cách xây dựng ứng dụng Dynamic Data với LINQto SQL Dynamic Data gì? ASP.NET Dynamic Data cung cấp ... Dynamic Data với LINQto SQL 13 Trả lời: Dynamic Data hỗ trợ mô hình liệu LINQto SQL ADO.NET Entity Framework Các bước xây dựng Dynamic Data với LINQto SQL Trả lời: Tạo project Dynamic Data...
... table with Orders DataTable dt = new DataTable( ); da.Fill(dt); // Bind the default view of the table to the grid dataGrid.DataSource = dt.DefaultView; cancelButton.Enabled = true; dataGrid.ReadOnly ... SqlCommand(sqlText, conn, tran); // Create a DataAdapter to retrieve all Orders SqlDataAdapter da = new SqlDataAdapter(cmd); // Define a CommandBuilder for the DataAdapter SqlCommandBuilder cb = new ... connection tran.Rollback( ); conn.Close( ); // Unbind the grid dataGrid.DataSource = null; startButton.Enabled = true; } private void UsingLockingHintsForPessimisticLockingForm_Closing( object sender,...
... LINQTO OBJECTS USING C# 4.0 USING OBJECTS AND AND EXTENDING LINQTO PARALLEL LINQ (PLINQ) Troy Magennis Upper Saddle River, NJ • Boston • Indianapolis • San Francisco New York • Toronto • ... attention to how they extend the LINQto Objects story This chapter demonstrates how to use the dynamic language features to make LINQ queries more fluent to read and write and how to combine LINQ ... mechanism for usingLINQ in current DataSet-based applications without rewriting usingLINQto SQL ■ A set of extensions to the DataRow and DataTable that allow to and from LINQ sequence support...
... userdefined data type QuoteData Dim qdPriceData As QuoteData() = New QuoteData(10) {} And we could reference the individual elements of a QuoteData array in the following way: qdPriceData(3).dblClose ... dblPriceData As Double() Dim intNumElements As Integer Dim blnMoreData As Boolean Do While blnMoreData intNumElements += ReDim Preserve dblPriceData(intNumElements) ‘ Read data feed and set blnMoreData ... in finance to hold data, matrix math, and build trees for pricing derivatives Important things to take note of are how to employ dynamic array sizing and how to pass and return arrays to and from...