diff --git a/src/lib/Category.php b/src/lib/Category.php
index 37d4d85..7f3d99c 100644
--- a/src/lib/Category.php
+++ b/src/lib/Category.php
@@ -22,7 +22,7 @@ class Category
   public function delete($id)
   // delete a specific category
 	{
-		DB::getInstance()->delete('plugin_materiels_category', 'id = ' . $id);
+		DB::getInstance()->delete('plugin_materiels_category', 'id = ?', $id);
 	}
 
   public function get($id)
diff --git a/src/lib/Equipment.php b/src/lib/Equipment.php
index 6c39027..bda2a2d 100644
--- a/src/lib/Equipment.php
+++ b/src/lib/Equipment.php
@@ -31,7 +31,7 @@ class Equipment
   public function delete($id)
   // delete a specific equipment
 	{
-		DB::getInstance()->delete('plugin_materiels_equipment', 'id = ' . $id);
+		DB::getInstance()->delete('plugin_materiels_equipment', 'id = ?', $id);
 	}
 
   public function listAllByCategory()
@@ -184,11 +184,11 @@ class Equipment
     $entries = DB::getInstance()->firstColumn(
       "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '0' AND kind IN (
         'Achat', 'Don', 'Récupération',
-        'Retour de location / prêt') AND equipment_id = '{$id}' AND mvt_date <= '{$date}';");
+        'Retour de location / prêt') AND equipment_id = ? AND mvt_date <= ?;", $id, $date);
     $outputs = DB::getInstance()->firstColumn(
       "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '1' AND kind IN (
         'Vente', 'Don', 'Besoin', 'Autre (perte, vol, ...)',
-        'Location / Prêt') AND equipment_id = '{$id}' AND mvt_date <= '{$date}';");
+        'Location / Prêt') AND equipment_id = ? AND mvt_date <= ?;", $id, $date);
     return $entries - $outputs;
   }
 
@@ -222,9 +222,9 @@ class Equipment
   // return number of a specific equipment is out at a specific date
   {
     $entries = DB::getInstance()->firstColumn(
-      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '0' AND kind = 'Retour de location / prêt' AND equipment_id = '{$id}' AND mvt_date <= '{$date}';");
+      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '0' AND kind = 'Retour de location / prêt' AND equipment_id = ? AND mvt_date <= ?;", $id, $date);
     $outputs = DB::getInstance()->firstColumn(
-      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '1' AND kind = 'Location / Prêt' AND equipment_id = '{$id}' AND mvt_date <= '{$date}';");
+      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '1' AND kind = 'Location / Prêt' AND equipment_id = ? AND mvt_date <= ?;", $id, $date);
     return $outputs - $entries;
   }
 
@@ -258,9 +258,9 @@ class Equipment
   // return the number of equipments no owned at a specific date
   {
     $entries = DB::getInstance()->firstColumn(
-      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '0' AND kind = 'Location / Prêt' AND equipment_id = '{$id}' AND mvt_date <= '{$date}';");
+      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '0' AND kind = 'Location / Prêt' AND equipment_id = ? AND mvt_date <= ?;", $id, $date);
     $outputs = DB::getInstance()->firstColumn(
-      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '1' AND kind = 'Retour de location / prêt' AND equipment_id = '{$id}' AND mvt_date <= '{$date}';");
+      "SELECT sum(equipment_number) FROM plugin_materiels_movement WHERE side = '1' AND kind = 'Retour de location / prêt' AND equipment_id = ? AND mvt_date <= ?;", $id, $date);
     return $entries - $outputs;
   }
 }
diff --git a/src/lib/Movement.php b/src/lib/Movement.php
index 083b467..3cfdcc2 100644
--- a/src/lib/Movement.php
+++ b/src/lib/Movement.php
@@ -22,7 +22,7 @@ class Movement
   public function delete($id)
   // delete specific movement
 	{
-		DB::getInstance()->delete('plugin_materiels_movement', 'id = ' . $id);
+		DB::getInstance()->delete('plugin_materiels_movement', 'id = ?', $id);
 	}
 
   public function listEntryKinds()
@@ -51,7 +51,7 @@ class Movement
   public function listAllOneSide($side)
   // return all entries if side is 0 or all outputs if side is 1 ordered by date
 	{
-		$mvts = DB::getInstance()->get("SELECT * FROM plugin_materiels_movement WHERE side = '{$side}' ORDER BY mvt_date DESC;");
+		$mvts = DB::getInstance()->get("SELECT * FROM plugin_materiels_movement WHERE side = ? ORDER BY mvt_date DESC;", $side);
     // for each movements get the equipment's designation
     $eqmt = new Equipment;
     foreach ($mvts as $key => $value) {
@@ -68,7 +68,7 @@ class Movement
 	{
     // get all entry dates after the specific date and make a list with its
     $after_entry_dates = DB::getInstance()->get(
-      "SELECT mvt_date FROM plugin_materiels_movement WHERE side = '0' AND kind = 'Retour de location / prêt' AND equipment_id = '{$id}' AND mvt_date > '{$date}';");
+      "SELECT mvt_date FROM plugin_materiels_movement WHERE side = '0' AND kind = 'Retour de location / prêt' AND equipment_id = ? AND mvt_date > ?;", $id, $date);
     $entry_dates = array($date);
     foreach ($after_entry_dates as $row)
     {
@@ -97,7 +97,7 @@ class Movement
     $after_output_dates = DB::getInstance()->get(
       "SELECT mvt_date FROM plugin_materiels_movement WHERE side = '1' AND kind IN (
         'Vente', 'Don', 'Besoin', 'Autre (perte, vol, ...)',
-        'Location / Prêt') AND equipment_id = '{$id}' AND mvt_date > '{$date}';");
+        'Location / Prêt') AND equipment_id = ? AND mvt_date > ?;", $id, $date);
     $output_dates = array($date);
     foreach ($after_output_dates as $row)
     {
@@ -124,7 +124,7 @@ class Movement
 	{
     // get all output dates after the specific date and make a list with its
     $after_output_dates = DB::getInstance()->get(
-      "SELECT mvt_date FROM plugin_materiels_movement WHERE side = '1' AND kind = 'Retour de location / prêt' AND equipment_id = '{$id}' AND mvt_date > '{$date}';");
+      "SELECT mvt_date FROM plugin_materiels_movement WHERE side = '1' AND kind = 'Retour de location / prêt' AND equipment_id = ? AND mvt_date > ?;", $id, $date);
     $output_dates = array($date);
     foreach ($after_output_dates as $row)
     {
@@ -170,11 +170,11 @@ class Movement
 	}
 
   public function AllEqmtMovements($eqmt_id)
-  // return list of all movements for a specific equipments
+  // return list of all movements for a specific equipment
   // ordered by date and side
   // if same date order by rent output and after put entry for return
 	{
     return DB::getInstance()->get(
-      "SELECT * FROM plugin_materiels_movement WHERE equipment_id = '{$eqmt_id}' ORDER BY mvt_date DESC, CASE WHEN (side = '1' AND kind = 'Location / Prêt') THEN 1 WHEN (side = '0' AND kind != 'Retour de location / prêt') THEN 2 ELSE 0 END, side DESC;");
+      "SELECT * FROM plugin_materiels_movement WHERE equipment_id = ? ORDER BY mvt_date DESC, CASE WHEN (side = '1' AND kind = 'Location / Prêt') THEN 1 WHEN (side = '0' AND kind != 'Retour de location / prêt') THEN 2 ELSE 0 END, side DESC;", $eqmt_id);
 	}
 }
diff --git a/src/templates/categories/materiels_par_categorie.tpl b/src/templates/categories/materiels_par_categorie.tpl
index d8fe5cf..aa5f897 100644
--- a/src/templates/categories/materiels_par_categorie.tpl
+++ b/src/templates/categories/materiels_par_categorie.tpl
@@ -70,7 +70,6 @@
       {foreach from=$eqmts_just_listed item="eqmt"}
         <tr>
           <td>{$eqmt.designation}</td>
-					</td>
 				</tr>
 			{/foreach}
 		</tbody>