Core class updates

Improved database abstraction class to support insert and select queries
in various forms.
Added classes for pulling log entries back out of the database.
Updated Job class to describe a known job in the database, and added
JobStatus to track status updates on jobs.
Updated Config class to connect to the database, and load all settings
on startup.
Improved the class autoloader to support Exceptions in a single file as
a special case, and added this file.

HandBrakeCluster/Database.class.php

@@ -3,9 +3,95 @@
 class HandBrakeCluster_Database {
 
     private $config;
+    private $dbh;
+
+    private $hostname;
+    private $username;
+    private $password;
+    private $dbname;
+
+    private $prepared_statements = array();
 
     public function __construct(HandBrakeCluster_Config $config) {
-        $this->config = $config;
+        $this->config   = $config;
+
+        $this->hostname = $this->config->getDatabase('hostname');
+        $this->username = $this->config->getDatabase('username');
+        $this->password = $this->config->getDatabase('password');
+        $this->dbname   = $this->config->getDatabase('dbname');
+
+        try {
+            $this->dbh  = new PDO("mysql:host={$this->hostname};dbname={$this->dbname}", $this->username, $this->password);
+        } catch (PDOException $e) {
+            throw new HandBrakeCluster_Exception_DatabaseConnectionFailed($e->getMessage());
+        }
+
+    }
+
+    public function __destruct() {
+        $this->dbh = null;
+    }
+
+    public function selectAssoc($sql, $key_col, $value_col) {
+        $results = array();
+
+        foreach ($this->dbh->query($sql) as $row) {
+            $results[$row[$key_col]] = $row[$value_col];
+        }
+
+        return $results;
+    }
+
+	public function selectList($sql, $bind_params = null) {
+		if ($bind_params) {
+	        $stmt = $this->dbh->prepare($sql);
+
+            foreach ($bind_params as $param) {
+                $stmt->bindValue(':'.$param['name'], $param['value'], $param['type']);
+            }
+
+			$result = $stmt->execute();
+			if (!$result) {
+				throw new HandBrakeCluster_Exception_DatabaseQueryFailed();
+			}
+
+			return $stmt->fetchAll();
+
+		} else {
+			$results = array();
+
+			$result = $this->dbh->query($sql);
+			foreach ($result as $row) {
+				$results[] = $row;
+			}
+
+			return $results;
+		}
+	}
+
+	public function selectOne($sql, $bind_params = null) {
+		$rows = $this->selectList($sql, $bind_params);
+		if (count($rows) != 1) {
+			throw new HandBrakeCluster_Exception_ResultCountMismatch(count($rows));
+		}
+
+		return $rows[0];
+	}
+
+    public function insert($sql, $bind_params = null) {
+        $stmt = $this->dbh->prepare($sql);
+
+        if ($bind_params) {
+            foreach ($bind_params as $param) {
+                $stmt->bindValue(':'.$param['name'], $param['value'], $param['type']);
+            }
+        }
+
+        return $stmt->execute();
+    }
+
+    public function errorInfo() {
+        return $this->dbh->errorInfo();
     }
 
 }