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Additionally, transaction management in PDO can be performed through a method invocation using beginTransaction(), commit(), and rollback(). Listing 8-26 shows a basic example of using the PDO class to open a database and perform basic queries within a transaction. Listing 8-26. Basic Queries with PDO < php try { $dbh = new PDO("sqlite:foods.db"); } catch (PDOException $e) { echo 'Connection failed: ' . $e->getMessage(); } $dbh->beginTransaction(); $sql = 'select * from foods limit 10'; foreach ($dbh->query($sql) as $row) { print $row['type_id'] . " "; print $row['name'] . "<br>"; } $dressing = $dbh->quote("Newman's Own Vinegarette"); $dbh->exec("insert into foods values (NULL, 4, $dressing)"); echo $dbh->lastInsertId(); $dbh->rollback(); > PDO uses the setAttribute() and getAttribute() methods to set various database connection parameters. The only parameter that applies to SQLite is PDO_ATTR_TIMEOUT, which sets the busy timeout. The prepare() method uses a SQLite statement to navigate through a result set. It also supports both named and positional parameters. To bind a SQL parameter, there must be some associated variable in PHP to bind it to. PHP variables are bound to parameters using PDOStatement::bindParam(), which has the following declaration: nool bindParam ( mixed parameter, mixed &variable, int data_type, int length, mixed driver_options ); The parameter argument specifies the SQL parameter. For numbered parameters, this is an integer value. For named parameters, it is a string. The variable argument is a reference to a PHP variable to bind. The data_type argument specifies the data type of the variable. Finally, the length argument specifies the length of the value if the variable is a string. The value specifies the maximum length of the string to return. Listing 8-27 is a complete example of using positional parameters.

You can achieve fault tolerance by identifying points of failure and providing redundancy. Typically, applications have numerous points of failure. Some of the most obvious are as follows: The network feed to your user s buildings The power feed to your user s buildings The network feed and power feed to your data center The primary DNS host servicing your domain Your firewall, routers, switches, and so on Your web server Your application server Your database server Your internal LAN

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Security in an SOA presents several challenges Traditional security mechanisms do not provide a comprehensive solution because most of them depend on a well-defined boundary that limits the enforcements of their rules Plus, our industry has been shaped by companies that have developed products that do not necessarily integrate well with each other or that do not integrate at all If we add the fact that hacker attacks occur on a daily basis, and that they could even come from someone within your organization, we have a not-so-pleasant picture that requires well-designed security strategies Before we look at some of these strategies, let s review the most important challenges involved in securing an SOA: Interoperability and policies: There are several encryption and signing mechanisms and there are several platforms with different security models.

Listing 8-27. Positional Parameters with PDO < php $dbh = new PDO("sqlite:foods.db"); $sql = 'select * from foods where type_id= And name= '; $stmt = $dbh->prepare($sql); $type_id = 9; $name = 'JujyFruit'; $stmt->bindParam(1, $type_id, PDO_PARAM_INT); $stmt->bindParam(1, $name, PDO_PARAM_STR, 50); $stmt->execute(); > Named parameters work in a similar fashion. When you bind these parameters, you identify them by their names (rather than integers). Listing 8-28 is a modification of the previous example using named parameters. Listing 8-28. Named Parameters with PDO < php $dbh = new PDO("sqlite:foods.db"); $sql = 'select * from foods where type_id=:type And name=:name;'; $stmt = $dbh->prepare($sql); $type_id = 9; $name = 'JujyFruit'; $stmt->bindParam('type', $type_id, PDO_PARAM_INT); $stmt->bindParam('name', $name, PDO_PARAM_STR, 50); $stmt->execute(); > PDO also allows you to bind columns of result sets to PHP variables. This is done using PDOStatement::bindColumn(), which has the following declaration: bool bindColumn (mixed column, mixed ¶m, int type) The column argument refers to either the name of the column or its index in the SELECT clause. The param argument is a reference to a PHP variable, and the type argument specifies the type of the PHP variable. The following example binds two variables $name and $type_id to a result set: < php $dbh = new PDO("sqlite:foods.db"); $sql = 'select * from foods limit 10'; $stmt = $dbh->prepare($sql); $stmt->execute(); $name; $type_id; $stmt->bindColumn('type_id', $type_id, PDO_PARAM_INT); $stmt->bindColumn('name', $name, PDO_PARAM_STR);

In order to achieve high levels of fault tolerance, you need to ensure that if any one of these fails, some system will instantly kick in and fill the void If the data center power goes out, a generator will kick in If a bulldozer cuts your network feed, you ll need to have a second network feed coming in from the other side of the building, and so forth Considering some of the larger and more well-known outages of major websites in the past couple of years, it s worth noting that most of them occurred because of construction work cutting network or power feeds or because their ISP or external DNS provider went down or was attacked That said, there are plenty of examples of websites going down because of local equipment failure.

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