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In Listing 3-1, we start off by creating a string with the SQL insert statement. This statement contains two parameters: @Amount and @Vendor. These are placeholders that will be replaced by values when the statement is executed. Next, we create two parameters that bind the placeholder names to specific values. For the first insert, we bind the value 99.97 to the Amount placeholder. Next, we create a parameter that binds Ace Plumbing to the Vendor placeholder. To execute the SQL statement, we pass both the string with the SQL statement and the array of parameters to the ExecuteStoreCommand() method. ExecuteStoreCommand() returns the count of rows affected by the statement. In our case, one row is inserted each time we call ExecuteStoreCommand(). If you don t have any parameters for a SQL statement, there is an overload of the ExcuteStoreCommand() method that takes just the SQL statement. The pattern in Listing 3-1 is similar to how we would do the same thing in ADO.NET with SqlClient. The difference is that we don t need to construct a connection string and explicitly open a connection. This is handled by the object context. The way we express the command text and the parameters are also different. With ExecuteNonQuery(), the command text and parameters are set on the underlying Command object. Here, these are passed into the ExecuteStoreCommand() method. Of course, the observant reader will notice here that we re really not querying the model. In fact, as we mentioned, you don t need to have the Payment entity shown in Figure 3-2. The ExecuteStoreCommand() method simply uses the object context for its connection to the underlying data store.

The direction that findNewDirection chooses isn t entirely random. If the monster has been moving left or right, it will choose up or down as a first choice. This has the effect of making the monster look like he is actively exploring the maze, rather than just blindly stumbling through it. Here s the entire findNewDirection method: public function findNewDirection(gameObject:TileModel):void { var newDirection:String = ""; //Choose a random number between 1 and 4 var randomDirection:int = Math.ceil(Math.random() * 4); //Encourage the monster to choose up or down if //it's currently moving left or right if(gameObject.direction == "left" || gameObject.direction == "right") { if(randomDirection <= 2) { newDirection = "up"; } else { newDirection = "down"; } }

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Using these values, the script will iterate through each of the specified folders, repairing home folders for each user. You can also use this script to employ ACLs for administrative access, perhaps for a group of users----supervisors ----who need read/write access to all User home folders. Alternatively, you might want to give your filesystemadmins group access to all data on the share. This is specified via the aclGroups variable, and allows you to indicate one of three access levels: fc (equivalent to a Full Control ACE), rw (equivalent to a Read/Write ACE), ro (equivalent to Read Only). (See 4 for more information on ACLs.) Our desired access rights would be accomplished with the following aclGroups entry:

To parameterize or not to parameterize, that is the question .Okay, Shakespeare aside, should I use parameters for SQL statements or just create the SQL statement strings that contain the parameters The best practice is to use parameters whenever possible, and here are some reasons why: Parameterized SQL statements help prevent SQL Injection attacks. If you construct a complete SQL statement as a string by appending together strings that you get from a user interface such as an ASP.NET TextBox control, you may end up constructing a SQL statement that does some serious damage to your database or reveals some sensitive information. When you use parameterized SQL statements, the parameters are handled in a way that prevents this. Parameterized SQL statements, as we have shown in this recipe, allow you to reuse the non-varying part of the statement. This reuse can make your code more simple and easy to read. Parameterized SQL statements make your code more maintainable and configurable. For example, the statements could come from a configuration file. This would allow you to make some changes to the application without changing the code.

//...if the monster is currently moving up or down, make //it move left or right else { if(randomDirection <= 2) { newDirection = "left"; } else { newDirection = "right"; } } //Test the new direction and call this method recursively //if the direction runs the object into a wall switch(newDirection) { case "left": if(_mazeMap[gameObject.mapRow][gameObject.mapColumn - 1] == FLOOR) { gameObject.direction = newDirection; gameObject.vx = -8; gameObject.vy = 0; } else { //If the test hits a wall, assign this direction as //the object's new direction and test again. //(Assigning the new direction prevents the object //from accidentally getting stuck in cul-de-sacs) gameObject.direction = newDirection; findNewDirection(gameObject); } break; case "right": if(_mazeMap[gameObject.mapRow][gameObject.mapColumn + 1] == FLOOR) { gameObject.direction = newDirection; gameObject.vx = 8; gameObject.vy = 0; }

declare -x aclGroups="filesystemadmins:fc,supervisors:rw"

Let s say you have a model with a Student entity type as shown in Figure 3-3.

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