Beginning C# 2005 Databases From Novice to Professional phần 10 potx

... in the from clause from a typed table to the data table you wanted to access: from c in ds.Tables[0].ToQueryable() and then y ou did something r ather differ ent in the select clause , to get ... of C# 3.0 message box 777Xch18final.qxd 11/18/06 2:29 PM Page 465 connecting to SSE with SqlConnection, 96 101 data provider connection classes, 95 debugging connections to SQL se...

Ngày tải lên: 09/08/2014, 14:20

... a bucket, ready to be filled with water, but it needs an external pipe to let the water in. In other words, the dataset needs a data adapter to populate it with data and to sup- port access to the data ... chapter, you used data readers to perform a variety of common tasks, from sim- ply looping through single result sets to handling multiple result sets. You learned how to...

Ngày tải lên: 09/08/2014, 14:20

... page count BOOKS FOR PROFESSIONALS BY PROFESSIONALS ® Beginning C# 2005 Databases: From Novice to Professional Dear Reader, Thousands of C# programmers have become database professionals through the ... Syed Fahad Gilani, Jacob Hammer Pedersen, and Jon Reid Beginning C# 2005 Databases From Novice to Professional CYAN MAGENTA YELLOW BLACK PANTONE 123 CV ISBN 1-...

Ngày tải lên: 09/08/2014, 14:20

... SQL58 Figure 3 -10. Shippers after updating a row 777Xch03final.qxd 11/18/06 3:41 PM Page 58 CHAPTER 2 ■ GETTING TO KNOW OUR TOOLS 29 Figure 2-17. Restoring the Northwind database Figure 2-18. Restore-failure ... map to the .NET S ystem.Data.SqlTypes.SqlDateTime type (see Table 3 -10) . Table 3 -10. T-SQL Date/Time Data Types SQL Data Type C# Type Description datetime SqlDateTime Date a...

Ngày tải lên: 09/08/2014, 14:20

... connecting to a local SSE instance, but it might happen in trying to connect to a SQL Server instance on another server. • A hardware problem: Again, this is unlikely if you’re trying to connect to a ... method to create a SqlDataReader from a command to display query results. Try It Out: Using the ExecuteReader Method To use the ExecuteReader method, follow these steps: 1....

Ngày tải lên: 09/08/2014, 14:20

... optimal way. ■T ip In general, tr y to exploit SQL, ra ther than code C# procedures, to get the data you need from the database. Database servers are optimized to perform selections and sorts, as ... utility to create a class for a typed dataset, it’s a lot of work, is subject to error, and is something you’ll rarely (if ever) want or need to do. There’s little advantage to...

Ngày tải lên: 09/08/2014, 14:20

... for both the customer and company names. Change the city for customer WOLZA from Warszawa to Gdansk. Now click the Save Data button. The new row is now inserted into the Customers table in the ... updated too. Close the window and rerun the project to prove this. 9. Put Customers back the way it was by changing WOLZA’s city back to Warszawa and deleting customer zzz. Click Save Data...

Ngày tải lên: 09/08/2014, 14:20

... typically used to pass values between stored procedures, but sometimes they need to be accessed from C#, so let’s write a stored procedure with an output parameter so we can use it in a C# program ... this chapter, we cover: • How to create, modify, and delete stored procedures in SSMSE • How to use stored procedures in C# programs Creating Stored Procedures Stored procedures c...

Ngày tải lên: 09/08/2014, 14:20

... Fail In this example, you’ll try to insert an invalid new customer and try to delete an undeletable one. 1. Run sp_Trans_Test to add customer a and delete customer ALFKI. The result should appear ... @" insert into customers ( customerid, companyname ) values(@newcustid, @newconame) "; // DELETE statement string sqldel = @" delete from customers where customerid = @old...

Ngày tải lên: 09/08/2014, 14:20

... to use delegates to bind them to event handlers. Specifically, you saw the following: • That a connection’s StateChange event fires when the state changes from Open to Closed or from Closed to ... it easy for you to use ADO.NET XML features if you choose to. The FOR XML clause has four modes: • RAW • AUTO • EXPLICIT • PATH We’ll use the first two in examples to show how t...

Ngày tải lên: 09/08/2014, 14:20