... and performs a projection of fields from each source table.Dwonloaded from: iDATA.ws Chapter 18 UsingLINQ to DataSet 307C#// Explicit join.var results = from cu in Customer.AsEnumerable() ... ADO.NET data into a LINQ query.Dwonloaded from: iDATA.ws Chapter 18 UsingLINQ to DataSet 313Chapter 18 Quick ReferenceTo Do ThisInclude a DataTable instance in a LINQ query Call the DataTable ... information from the ad hoc in-memory statusTable collection.SummaryThis chapter introduced LINQ to DataSet, an ADO.NET-focused variation of LINQ to Objects. The implementation of the LINQ to Dataset...
... mySqlDataAdapter.SelectCommand = mySelectCommand; The SELECT statement is then run when you call the mySqlDataAdapter object's Fill() method to retrieve rowsfrom the Products table into a DataSet. ... DataAdapter. Using Stored Procedures to Add, Modify, and Remove Rowsfrom 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...
... a DataSet object named myDataSet and populates it by calling mySqlDataAdapter.Fill(): DataSet myDataSet = new DataSet( ); mySqlConnection.Open(); int numOfRows = mySqlDataAdapter.Fill(myDataSet, ... number of rows retrieved from the database and copied to myDataSet. The myDataSet object now contains a DataTable named Products, which contains the rows retrieved by the following SELECT statement ... myDataTable.NewRow() myNewDataRow.RowState = Detached Calling myDataTable .Rows. Add() myNewDataRow.RowState = Added Calling mySqlDataAdapter.Update() numOfRows = 1 myNewDataRow.RowState = Unchanged ...
... remotely run SQL statement. While other LINQ providers can be mixed—Chapter 18, UsingLINQ to DataSet, ” combined LINQ to Objects and LINQ to DataSet content LINQ to Entities imposes restric-tions ... Queries with LINQ to EntitiesAs 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 ... will feed data into LINQ. Dwonloaded from: iDATA.ws Chapter 19 UsingLINQ to Entities 321The grid displays content from the Customer and OrderEntries entities, plus a column from the local statusTable...
... platform. LINQ to DataSet and LINQ to Entities both allow you to build LINQ queries that interact with data sourced from SQL Server, either directly (LINQ to Entities) or indirectly (LINQ to DataSet) . ... chapter.Dwonloaded from: iDATA.ws Chapter 20 UsingLINQ 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 ... function within a LINQ query.Dwonloaded from: iDATA.ws Chapter 20 UsingLINQ to SQL 335C# using (SalesOrderLink context = new SalesOrderLink(connectionString)){ var results = from cu in context.Customers...
... 5-1. Example 5-1. File: CopyRowsBetweenTablesForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Data; using System.Data.SqlClient; ... import the first three rows. for (int i = 0; i < 3; i++) { dtCopy.ImportRow(dt .Rows[ i]); } } else if (selectRadioButton.Checked) { // Copy using result of Select( ) method. foreach(DataRow ... DataRow objects from one DataTable to another. Three techniques for selecting records to copy are demonstrated in the following example: ã Use the Rows property to access rows in the DataRowCollection...
... 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 rowsfrom 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;...
... 8-15. File: UsingXmlTemplateQueriesForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Windows.Forms; using Microsoft.Data.SqlXml; using System.Data; ... Recipe 8.10 Filling a DataSetUsing an XML Template Query Problem You have an XML template query that you need to use from ADO.NET. You need to fill a DataSetusing an XML template query. ... customerId; // Create the DataSet. DataSet ds = new DataSet( ); // Create the SQL XML DataAdapter. SqlXmlAdapter da = new SqlXmlAdapter(cmd); // Fill the DataSet. try { da.Fill(ds);...
... Namespaces, variables, and constants using System; using System.Configuration; using System.IO; using System.Xml; using System.Xml.Xsl; using System.Data; using System.Data.SqlClient; // ... <xsl:for-each select= "/CategoriesDS/Categories"> <tr> <td> <xsl:value-of select= "CategoryID" /> </td> <td> <xsl:value-of select= "CategoryName" ... functionality more conveniently than could be accomplished using the DataSet directly. To use XSLT to transform the contents of a DataSet, create an XslTransform object and call the Transform(...
... 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...
... 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...
... alternative (non-dominated) senses, we selected the ancestor ly-ing at the same distance towards the root from thegiven sense as the average distance from the dom-inated senses to the derived ... acquired knowl-edge grows, it becomes more feasible to abstract from existential statements to stronger, more gen-eral claims on what usually obtains in the realworld. Using a method motivated ... WordNet were individuallyexamined via inspection of randomly selected ex-amples from the hierarchy. As with holonyms wedecided that using any of these additional relationtypes would degrade...
... bạn sẽ thấy rằng câu lệnh mà LINQ to SQL thực thi là thực sự, thực sự tốt. 4. Gắn nối các câu truy vấn LINQ to SQL vào các control LINQ to SQL Các câu truy vấn LINQ trả về kết quả mà nó sẽ ... hình hóa trong trình thiết kế LINQ to SQL). LINQ to SQL Tutorial 23 Bài 3: Truy vấn Cơ sở dữ liệu Tháng trước tôi bắt đầu viết loạt bài về LINQ to SQL. LINQ to SQL là một bộ khung (framework) ... danh: LINQ to SQL Tutorial 26 Điều này rõ ràng làm cho việc xem những gì LINQ to SQL làm cho bạn trở thành cực kỳ dễ dàng. Nhớ rằng bạn có thể dễ dàng thay thế câu SQL mà LINQ to SQL...
... cấp LINQ (LINQ provider: như LINQ to SQL, LINQ to Object…). Bạn không cần định nghĩa các phương thức query/insert/update/delete cho nguồn dữ liệu để gọi, thay vào đó bạn có thể trỏ <asp:linqdatasource> ... kiện Selecting trên <asp:LinqDataSource> nếu muốn tùy biến câu truy vấn LINQ trong đoạn code. Bước 5: Thêm các quy tắc kiểm tra logic Như tôi đã nói đến trong phần 4 của loạt bài LINQ ... LINQ to SQL Tutorial 49 Quan trọng: Một trong những điểm hay của LINQ hay LINQ to SQL là nó không được thiết kế để chỉ làm việc với lớp giao diện, hay với một control cụ thể nào như LinqDataSource....