diff --git a/tools/modelGraph.php b/tools/modelGraph.php
new file mode 100755
index 0000000..0a8f084
--- /dev/null
+++ b/tools/modelGraph.php
@@ -0,0 +1,166 @@
+#!/usr/bin/php
+<?php
+/** DomFramework
+  * @package domframework
+  * @author Dominique Fournier <dominique@fournier38.fr>
+  */
+
+require_once ("domframework/dblayeroo.php");
+
+/** modelGraph
+  * Allow to create the relational graph of an existing database
+  * Use GraphViz to generate the graph
+  * Request the database DSN to operate
+  */
+class modelgraph
+{
+  // PROPERTIES
+  /** The connected object dblayeroo
+    */
+  private $db;
+  /** The output file
+    */
+  private $output;
+
+  /** The constructor wait for $dsn
+    * @param string $dsn The DSN to connect to database
+    * @param string $output The output file to generate
+    */
+  public function __construct ($dsn, $username, $password, $output)
+  // {{{
+  {
+    $this->output = $output;
+    $this->db = new \dblayeroo ($dsn, $username, $password);
+    $this->graphvizCommande ();
+  }
+  // }}}
+
+  /** Generate the output file
+    */
+  public function generate ()
+  // {{{
+  {
+    $tables = array ();
+    foreach ($this->db->listTables () as $table)
+    {
+      $tables[$table] = $this->db->getTableSchema ($table);
+    }
+    $d = "digraph G {\n";
+    $d .= "  node [shape=box];\n";
+    $d .= "  rankdir=RL\n";
+
+    // Generate the tables objects with the fields
+    foreach ($tables as $table => $schema)
+    {
+      $d .= "  /** TABLE '$table' */\n";
+      $d .= "  \"$table\" [\n";
+      $d .= "    shape = \"plaintext\"\n";
+      $d .= "    label = <";
+      $d .= "<TABLE BORDER=\"0\" CELLBORDER=\"1\" CELLSPACING=\"0\">\n";
+      // Display the name of the table as title
+      $d .= "       <TR><TD COLSPAN=\"3\" BGCOLOR=\"#00B0E0\">";
+      $d .= "$table</TD></TR>\n";
+      // Display the fields
+      $i = 0;
+      foreach ($schema["fields"] as $field => $params)
+      {
+        $d .= "       <TR>\n";
+        $d .= "<TD SIDES=\"TBL\" PORT=\"OUT-$field\">";
+        if (key_exists ($field, $schema["foreign"]))
+        {
+          // Foreign Key
+          $d .= "<FONT COLOR=\"#F02020\">!</FONT>";
+        }
+        elseif (key_exists ("primary", $schema) &&
+            $field === $schema["primary"])
+          $d .= "&#128273;"; // Primary key found
+        elseif (in_array ("not null", $params))
+          $d .= "<FONT COLOR=\"#00B0E0\">&#9670;</FONT>"; // NOT NULL
+        else
+          $d .= "&#9671;";
+        $d .= "</TD>\n";
+        $d .= "<TD ALIGN=\"LEFT\" SIDES=\"TB\">";
+        $d .= $field;
+        $d .= "</TD>\n";
+        $d .= "<TD ALIGN=\"LEFT\" PORT=\"IN-$field\" SIDES=\"TBR\">";
+        $d .= $params[0];
+        $d .= "</TD>\n";
+        $d .= "</TR>\n";
+        $i++;
+      }
+      $d .= "</TABLE>>\n";
+      $d .= "  ];\n";
+    }
+    // Generate the links between the tables
+    foreach ($tables as $table => $schema)
+    {
+      // "node1":"f2" -> "node5":"f0" [];
+      foreach ($schema["foreign"] as $field => $params)
+      {
+        $d .= "\"$table\":\"OUT-$field\" -> \"". $params[0].
+              "\":\"IN-".$params[1]."\" ";
+        $d .= "[];\n";
+      }
+    }
+    $d .= "}\n";
+    //echo $d;
+    $this->createJPG ($d);
+  }
+  // }}}
+
+  /** Look for the dot command
+    * @return the full path of 'dot' command
+    */
+  private function graphvizCommande ()
+  // {{{
+  {
+    foreach (explode (":", getenv ("PATH")) as $path)
+    {
+      if (file_exists ("$path/dot"))
+        return "$path/dot";
+    }
+    throw new \Exception ("Can not find 'dot' executable. Install graphviz",
+    500);
+  }
+  // }}}
+
+  /** Generate the JPEG file with graphviz
+    * @param string $content The content of the GV file
+    */
+  private function createJPG ($content)
+  // {{{
+  {
+    $tmp = tempnam ("/tmp", "modelgraph_");
+    file_put_contents ($tmp, $content);
+    $cmd = $this->graphvizCommande (). " -T jpeg $tmp ".
+           "-o ".escapeshellarg ($this->output)." 2>&1";
+    exec ($cmd, $output);
+    unlink ($tmp);
+    if (!empty ($output))
+    {
+      echo "ERROR : ".implode ("\n", $output);
+      exit (2);
+    }
+  }
+  // }}}
+}
+
+
+// MAIN PROGRAM
+if (isset ($argv[1]) && $argv[1] === "-h")
+{
+  echo "Create the ER Diagram of a SQL database\n";
+  echo "Usage : \n";
+  echo $argv[0]." DSN username password outputfile.jpg\n";
+  echo "DSN Examples : 'mysql:dbname=databaseName'\n";
+}
+if (! isset ($argv[1]))
+  die ("No DSN provided\n");
+if (! isset ($argv[2]))
+  die ("No username provided\n");
+if (! isset ($argv[3]))
+  die ("No password provided\n");
+if (! isset ($argv[4]))
+  die ("No output file provided\n");
+$modelgraph = new modelgraph ($argv[1], $argv[2], $argv[3], $argv[4]);
+$modelgraph->generate ();