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The EXPLAIN command tells you how MySQL intends to execute a particular SQL statement. When you see a particular SQL query appear to take up a significant amount of resources or cause frequent locking in your system, EXPLAIN can help you determine if MySQL has been able to choose an optimal pattern for data access. Let s take a look at the EXPLAIN results from the SQL commands in the earlier finduser1.php and finduser2.php scripts (Listings 6-10 and 6-11) we load tested with ApacheBench. First, Listing 6-17 shows the EXPLAIN output from our LIKE expression in finduser1.php. Listing 6-17. EXPLAIN for finduser1.php mysql> EXPLAIN SELECT * FROM test.http_auth WHERE username LIKE 'ud%' \G *************************** 1. row *************************** id: 1 select_type: SIMPLE table: http_auth type: range possible_keys: PRIMARY key: PRIMARY key_len: 25 ref: NULL rows: 128 Extra: Using where 1 row in set (0.46 sec) Although this is a simple example, the output from EXPLAIN has a lot of valuable information. Each row in the output describes an access strategy for a table or index used in the SELECT statement. The output contains the following fields: id: A simple identifier for the SELECT statement. This can be greater than zero if there is a UNION or subquery. select_type: Describes the type of SELECT being performed. This can be any of the following values: SIMPLE: Normal, non-UNION, non-subquery SELECT statement PRIMARY: Topmost (outer) SELECT in a UNION statement UNION: Second or later SELECT in a UNION statement DEPENDENT UNION: Second or later SELECT in a UNION statement that is dependent on the results of an outer SELECT statement UNION RESULT: The result of a UNION

private AgentController controller; private void Form1_Load(object sender, System.EventArgs e) { // Create the agent. controller = new AgentController(axAgent1, "Genie"); // List the supported animations. lstAnimations.DataSource = controller.GetAnimations(); // Show the agent. controller.Show(); } The animation is played with a single line of code in response to a button click: private void cmdPlay_Click(object sender, System.EventArgs e) { controller.Animate(lstAnimations.Text); } Moving, thinking, and speaking (shown below) are similarly easy: private void cmdSpeak_Click(object sender, System.EventArgs e) { controller.Speak(txtSpeak.Text); } Even if you don t like the idea of animated characters, it s hard to complain about the agent control. Similar functionality from a third-party developer comes at quite a price.

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Figure 15-15. A row successfully inserted into the Products table. The following list contains some of the main reasons why you might want to use the ODT.NET strongly typed DataSet feature in your project: Easy to code: Table and column names appear in IntelliSense. Data type checking: Data mismatch errors are caught at compile time rather than at run time. Less room for human error: The possibility of column and table names being wrongly spelled or typed is eliminated.

SUBQUERY: The first SELECT in a subquery DEPENDENT SUBQUERY: The first SELECT in a SUBQUERY that is dependent on the result of an outer query DERIVED: Subquery in the FROM clause table: The name of the table used in the access strategy described by the row in the EXPLAIN result type: A description of the access strategy deployed by MySQL to get at the data in the table or index in this row The possible values are system, const, eq_ref, ref, ref_or_null, index_merge, unique_subquery, index_subquery, range, index, and ALL We go into detail about all the different access types in the next chapter, so stay tuned for an in-depth discussion on their values possible_keys: Lists the available indexes (or NULL if there are none available) that MySQL had to choose from in evaluating the access strategy for the table that the row describes.

Note To use the agent control successfully, you need to use the RCW for the ActiveX control (which shows

up in the AxInterop.AgentObjects library). In the past, Microsoft has recommended that you use this version only in Web pages and rely instead on the nonvisual COM components in Windows applications (which are exposed through the AgentObjects library). This way you don t need to create an instance of the ActiveX control on each form. However, in a .NET application the AgentObjects library doesn t work successfully on its own, so you must use the ActiveX control. Luckily, both the ActiveX control and the COM component provide the same interface to interact with the agent character.

Saves time via code generation: Strongly typed datasets work tightly with the .NET DataAdapter class. Visual Studio automatically generates the Fill and Update functions in these adapters.

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