Implement function database::getInstance()

1 files changed, 30 insertions, 2 deletions

diff --git a/app/class/database.class.php b/app/class/database.class.php
index c0f13d7..74587f5 100644
--- a/app/class/database.class.php
+++ b/app/class/database.class.php
@@ -16,6 +16,9 @@
 define("DATABASE_CONFIG_FILE", "dbconfig.php");
 is_file(DATABASE_CONFIG_FILE) && require_once DATABASE_CONFIG_FILE;
 
+require_once "class/globals.php";
+require_once "class/mysql.class.php";
+
 /*
  * This class provides a common interface to various database drivers.
  * Scrott provides facilities for interacting with any DBMS that we can
@@ -39,11 +42,36 @@ abstract class database
     /*
      * Return the database instance object, creating it if this is the
      * first call to this function.  This function will need maintained
-     * as new DBMSs are supported.
+     * as new DBMSs are supported.  This function will throw if the
+     * database is not configured.
      */
     private static function getInstance() : database
     {
-        // TODO
+        global $_SCROTT;
+
+        if (self::$instance)
+            return self::$instance;
+
+        if (!isset($_SCROTT['conf']))
+            throw new Exception("Scrott database configuration is missing.");
+
+        switch ($_SCROTT['dbEngine'])
+        {
+            case "mysql":
+                $host   = $_SCROTT['dbHost'];
+                $uname  = $_SCROTT['dbUname'];
+                $passwd = $_SCROTT['dbPasswd'];
+                $dbname = $_SCROTT['dbName'];
+                self::$instance = new mysql($host, $uname, $passwd, $dbname);
+                break;
+
+            default:
+                throw new Exception("Problem with Scrott database configuration.  Invalid " .
+                    "database engine specified.");
+                break;
+        }
+
+        return self::$instance;
     }
 
     /*