Matthew MacDonald, Bill Hamilton's ADO.NET in a Nutshell PDF

By Matthew MacDonald, Bill Hamilton

ISBN-10: 0596003617

ISBN-13: 9780596003616

Written via specialists at the MicrosoftÂR .NET programming platform, ADO.NET in a Nutshell offers every little thing .NET programmers might want to get a jump-start on ADO.NET know-how or to sharpen their talents even additional. within the culture of O'Reilly's In a Nutshell sequence, ADO.NET in a Nutshell is the main entire and concise resource of ADO.NET info to be had. ADO.NET is the suite of information entry applied sciences within the .NET Framework that builders use to construct purposes prone getting access to relational facts and XML. Connecting to databases is a basic a part of so much functions, whether or not they are internet, WindowsÂR, disbursed, client/server, XML internet prone, or anything totally assorted. yet ADO.NET is considerably varied from Microsoft's prior info entry applied sciences - together with the former model of ADO - so even skilled builders have to comprehend the fundamentals of the hot disconnected version prior to they begin programming with it. present with the .NET Framework 1.1, ADO.NET in a Nutshell deals one position to appear if you need assistance with whatever relating to this crucial expertise, together with a connection with the ADO.NET namespaces and item version. as well as being a precious reference, this ebook offers a concise starting place for programming with ADO.NET and covers numerous matters that programmers face while constructing net functions or internet companies that depend on database entry. utilizing C#, this ebook offers actual global, sensible examples to help you positioned ADO.NET to paintings instantly.

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2 Executing a Command That Returns a Single Value ExecuteScalar( ) method returns a single value. If you perform a query, this will be the first value in the first column of the first row. More likely, you'll use ExecuteNonQuery( ) to return an aggregate value, which is the result of a calculation using a subset of rows. An aggregate function must be part of a SQL SELECT statement, which indicates the table and (optionally) a search filter and sort order: SELECT aggregate_expression FROM tables [WHERE search_condition] [ORDER BY order_expression ASC | DESC] Example 4-2 shows how an aggregate command can retrieve the total number of orders for the year 1996.

An aggregate function must be part of a SQL SELECT statement, which indicates the table and (optionally) a search filter and sort order: SELECT aggregate_expression FROM tables [WHERE search_condition] [ORDER BY order_expression ASC | DESC] Example 4-2 shows how an aggregate command can retrieve the total number of orders for the year 1996. NET Tutorial 45 Example 4-2. NET objects. SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(SQL, con); // Execute the command.

4 Connection Pooling and Performance Counters With large-scale distributed systems that handle thousands of clients, it's important to carefully choose the maximum connection pool size. Determining the correct size requires a little insight, some real-world experience, and a healthy dose of trial-and-error profiling. It depends on the number of clients, the pattern of usage, and the server hardware. This section will help with the insight. To gauge the best pool size, you can use performance counters.

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ADO.NET in a Nutshell by Matthew MacDonald, Bill Hamilton


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