Tài liệu Using the Get* Methods to Read Column Values doc

... Using the Get* Methods to Read Column Values Before I show you the other Get* methods that read column values, you need to know the standard C# types and the values they support. You need to ... see the SQL Server types and the values supported by those types in Table 2.3 of Chapter 2, "Introduction to Databases." Note The Get*...

Ngày tải lên: 24/12/2013, 01:17

... in the data reader with a data type of Object that is a DataReader. Hierarchical result sets combine the results for multiple queries into a single structure. They are generated using the ... DataReader for the Order Detail from the // IDataReader interface column. OleDbDataReader orderDetailDR = (OleDbDataReader)orderDR.GetValue(colOrder); // Iterate over records in...

Ngày tải lên: 24/12/2013, 05:15

... instance when the mouse button is pressed. If it is, several things occur. The current x and y positions of the mouse are recorded as the values of the x and y variables, respectively. These values ... all the drawn lines. The last action in this script sets the down state variable to true, indicating that the mouse button is pressed. 4. Add the following onMouseU...

Ngày tải lên: 21/01/2014, 13:20

... > Using the Key Class to Add Interactivity The Key class is a useful tool for capturing key events from the user (that is, user interaction with the keyboard). You can employ the Key ... whether the Tab key is currently pressed down. It returns a result of either true or false. The parameter of the isDown() method can reference either a specific key in the Key cl...

Ngày tải lên: 21/01/2014, 13:20

... customersDT that contains the top two rows from the Customers table. 2. Display the DataRow objects in customersDT using the DisplayDataRows() method, which is defined near the start of the ... XmlDataDocument object named myXDD, passing myDataSet to the constructor; this associates myDataSet with the XmlDataDocument. 4. Displays the XML document in myXDD by passing...

Ngày tải lên: 14/12/2013, 22:15

... Using an XmlDocument Object to Store an XML Document You use an object of the XmlDocument class to represent an XML document in a C# program. An XmlDocument object stores the nodes of the ... XML document. You can then use the output string from GetXml() as the input to the LoadXml() method of myXmlDocument; this loads myXmlDocument with the XML document containin...

Ngày tải lên: 14/12/2013, 22:15

... Column Values In addition to using the Get* methods to read column values as standard C# types, if you are using SQL Server, you can also use the GetSql* methods. The GetSql* methods return values ... illustrates how to read column values as C# types using the Get* methods */ using System; using System.Data; using System.Data.SqlC...

Ngày tải lên: 24/12/2013, 01:17

... STRONGLYTYPEDCOLUMNVALUESSQL.CS /* StronglyTypedColumnValuesSql.cs illustrates how to read column values as Sql* types using the GetSql* methods */ using System; using System.Data; using ... methods have to do. Tip If you are using SQL Server, always use the GetSql* methods and Sql* types rather than the Get* methods and the standard C# types...

Ngày tải lên: 24/12/2013, 01:17

... table contains a column named CustomerID that is a foreign key to the CustomerID column of the Customers table (CustomerID is the primary key for the Customers table). The use of the foreign key ... shows the completed form up and running. Notice that the top part of the form shows the details for the row from the Customers table where the CustomerID is ALFK...

Ngày tải lên: 24/12/2013, 01:17

... display the new form, as shown in Figure 6.26 . Notice that the top part of the form shows the details for the row from the Customers table where the CustomerID is ALFKI; the bottom part of the ... bound to the CustomerID column of the Customers table. This means that when you run the form and load data from the database, the CustomerID column value will...

Ngày tải lên: 24/12/2013, 01:17