using strongly typed dataset c

Ngày tải lên: 21/01/2014, 07:20

... FindByCustomerID() method. You can check if a column value contains a null value using methods such as IsContactNameNull(), and you can set a column to null using methods such as SetContactNameNull(). You'll ... sqlConnection1.Close(); } Feel free to compile and run the example form. Modifying Data Using a Strongly Typed DataSet In Chapter 10 , you saw how to create and use a strongly typed ... strongly typed object of the MyDataSet class. Note One of the features of a strongly typed DataSet object allows you to read a column value using a property with the same name as the column....

Ngày tải lên: 24/12/2013, 01:17

... rows collection and display columns. foreach(CategoriesDS.CategoriesRow row in ds.Categories) [ Team LiB ] Recipe 2.19 Replacing Null Values in a Strongly Typed DataSet Problem When a column ... null column values. The C# code is shown in Example 2-26 . Example 2-26. File: TypedDataSetNullsForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using ... over the rows collection and display columns. foreach(CategoriesDS_AnnotatedNull.CategoriesRow row in ds.Categories) { // Get the Description. String description = row.Description; ...

Ngày tải lên: 14/12/2013, 18:16

... typedName DataRowCollect ion TableName typedPlural DataRow TableNameRow typedName DataColumn DataTable.ColumnNameColumnDataRow.ColumnName typedName Property PropertyName typedName Child accessor GetChildTableNameRows ... strongly typed DataSet. The schema is annotated so that you can access the collection of rows in the table by using the Categorys property of the DataSet rather than categories, each row by using ... 2-24. File: TypedDataSetNamesForm.cs // Namespaces, variables, and constants using System; using System.Configuration; using System.Text; using System.Data; using System.Data.SqlClient; ...

Ngày tải lên: 24/12/2013, 05:15

Ngày tải lên: 21/01/2014, 11:20

... java.sql.Struct interface, the Struct class also has the following proprietary constructor and methods, all of which can throw a SQLException: STRUCT STRUCT(StructDescriptor type, Connection conn, Object ... which can throw a SQLException: OracleConnection getConnection( ) StructDescriptor getDescriptor( ) STRUCT getSTRUCT( ) Object getValue( ) Object getValue(Dictionary map) boolean isConvertibleTo(Class ... OracleConnection getConnection( ) StructDescriptor getDescriptor( ) Datum[] getOracleAttributes( ) boolean isConvertibleTo(Class jClass) Object toJdbc( ) 15.7.5 REF Implements Ref The oracle.sql.REF...

Ngày tải lên: 29/09/2013, 09:20

... You can mix LINQ to Objects and LINQ to DataSet content in the same query simply by including each source in the From clause. C# // Build an ad hoc collection, although you could also // include ... values contained in each DataRow instance exist as System.Object instances and only indirectly express their true types through DataColumn definitions. To overcome these deficiencies, the LINQ to DataSet ... iDATA.ws Chapter 18 Using LINQ to DataSet 311 2. Open the source code view for the OrderViewer form. Locate the GetConnectionString function; this is a routine that uses a SqlConnectionStringBuilder...

Ngày tải lên: 03/10/2013, 00:20

Ngày tải lên: 21/01/2014, 07:20

Ngày tải lên: 17/03/2014, 20:20

... thread timer is created with a TimerClassback delegate CheckRefreshDataSet, with a due time of one second, and a period of one second. Update Button.Click Uses a DataAdapter to update changes made ... made to the first DataTable back to the data source. CheckRefreshDataSet( ) This method is called periodically by the thread timer. The method checks whether the current time is later than the ... DateTime.Now.AddSeconds(DATAREFRESH_SECONDS).ToString( ); // Start the timer. timer = new System.Threading.Timer( new TimerCallback(CheckRefreshDatabase), null, DATASETCHECKREFRESHINTERVAL_MS, DATASETCHECKREFRESHINTERVAL_MS);...

Ngày tải lên: 14/12/2013, 18:16

... an active connection to the database. Disconnected DataSet objects act as a data cache in applications. You can modify the data in the DataSet, and later reopen the connection and send the changes ... this case, the database connection will remain open after the Fill method completes: SqlConnection dataConnection = new SqlConnection(); dataConnection.ConnectionString = "Integrated Security=true;" ... UnitsIsStock column and then click a different cell. The error icon disappears and the data is accepted. 27. Type an alphabetic string into the CategoryID column and then click a different cell....

Ngày tải lên: 15/12/2013, 00:15

... mySqlTransaction. You can commit those changes using the Commit() method of mySqlTransaction: mySqlTransaction.Commit(); You could also roll back those changes using the Rollback() method ... mySqlTransaction. Note A transaction is rolled back by default; therefore, you should always explicitly commit or roll back your transaction using Commit() or Rollback() to make it clear what ... Each of the Command objects in mySqlDataAdapter will now use mySqlTransaction. Let's say you added, modified, and removed some rows from a DataTable contained in a DataSet named myDataSet....

Ngày tải lên: 24/12/2013, 01:17

... SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); mySqlCommand.CommandText = "SELECT TOP 2 CustomerID, CompanyName, ContactName, Address " + "FROM Customers " ... type="xsd:string" minOccurs="0" /> </xsd:sequence> </xsd:complexType> </xsd:element> SqlCommand mySqlCommand = mySqlConnection.CreateCommand(); mySqlCommand.CommandText ... mySqlDataAdapter.SelectCommand = mySqlCommand; DataSet myDataSet = new DataSet( ); mySqlConnection.Open(); Console.WriteLine("Retrieving rows from the Customers table"); mySqlDataAdapter.Fill(myDataSet,...

Ngày tải lên: 24/12/2013, 01:17

Ngày tải lên: 21/01/2014, 07:20

Ngày tải lên: 21/01/2014, 11:20

Ngày tải lên: 21/01/2014, 11:20

Ngày tải lên: 26/01/2014, 10:20

Ngày tải lên: 26/01/2014, 10:20

... ph c hệ thống mail c ng nhanh c ng tốt. Dial-Tone Recovery là giải pháp c thể giúp bạn khôi ph c hệ thống mail nhanh chóng, không làm gián đoạn nhu c u liên l c e-mail c a c ng ty. M c đích chính ... lỗi. M c đích là khôi ph c nhanh chóng vi c gửi nhận thư c a user, giúp cho user c thể gửi nhận thư ngay lập t c không làm gián đoạn nhu c u liên l c e-mail c a c ng ty. kế tiếp mới khôi ph c mailbox database ... thành c ng, chọn Go back to task center - Tiếp theo ở m c Manage Recovery Storage Group, chọn Merge or Copy mailbox contents Recovering Mailbox User Using Dial-Tone Recovery http://msopenlab.com/index.php?option=com_content&view=article&id=...

Ngày tải lên: 14/08/2012, 08:51

... project and choose Clean Project to clean the project. ■ In the Projects window, right-click the package and choose Compile Package (F9) to compile a package. ■ In the Projects window, right-click ... project B compiles against project C, but project A does not compile against project C. This means that project A only has project B on its runtime classpath. If project A requires both project ... dependencies between the projects. Each project can have any number of source folders. Source folders can be added and removed after project creation. You can also create dependencies with...

Ngày tải lên: 17/08/2012, 09:18