diff --git a/src/Annotation/Property/Relation.php b/src/Annotation/Property/Relation.php
index 76df8a8..5abf696 100644
--- a/src/Annotation/Property/Relation.php
+++ b/src/Annotation/Property/Relation.php
@@ -30,7 +30,11 @@ class Relation implements \Ulmus\Annotation\Annotation {
     }
     
     public function entity() {
-        $e = $this->entity;
+        try {
+            $e = $this->entity;        
+        } catch (\Throwable $ex) {
+            throw new \Exception("Your @Relation annotation seems to be missing an `entity` entry.");
+        }
         
         return new $e();
     }
diff --git a/src/Common/EntityField.php b/src/Common/EntityField.php
index 1d63f2d..a2d5d56 100644
--- a/src/Common/EntityField.php
+++ b/src/Common/EntityField.php
@@ -27,6 +27,7 @@ class EntityField
     {
         $name = $this->entityResolver->searchFieldAnnotation($this->name, new Field() )->name ?? $this->name;
         
+        #return $useAlias ? "{$this->alias}.`{$this->name}`" : "`{$this->name}`"; <-SQL
         return $useAlias ? "{$this->alias}.\"{$name}\"" : "\"{$name}\"";
     }
 
diff --git a/src/Common/PdoObject.php b/src/Common/PdoObject.php
index 2b9d518..e481aca 100644
--- a/src/Common/PdoObject.php
+++ b/src/Common/PdoObject.php
@@ -16,8 +16,13 @@ class PdoObject extends PDO {
                 return $statement;
             }
         } catch (\PDOException $e) {
-            debogueur($sql, $parameters);
-            throw $e;
+            switch ( $e->getCode() ) {
+                case 42000:
+                    throw new \PdoException($e->getMessage() . " `$sql` with data:" . json_encode($parameters));
+                    
+                default:
+                    throw $e;
+            }
         }
     }
 
@@ -27,8 +32,13 @@ class PdoObject extends PDO {
                 return $this->execute($statement, $parameters, true);
             }
         } catch (\PDOException $e) {
-            debogueur($sql, $parameters);
-            throw $e;
+            switch ( $e->getCode() ) {
+                case 42000:
+                    throw new \PdoException($e->getMessage() . " `$sql` with data:" . json_encode($parameters));
+                    
+                default:
+                    throw $e;
+            }
         }
         
         return null;
diff --git a/src/EntityTrait.php b/src/EntityTrait.php
index c74b32d..2638954 100644
--- a/src/EntityTrait.php
+++ b/src/EntityTrait.php
@@ -196,8 +196,21 @@ trait EntityTrait {
         foreach($entityResolver->fieldList() as $key => $field) {
             $annotation = $entityResolver->searchFieldAnnotation($key, new Field() );
 
-            if ( isset($this->$key) ) {                
-                $dataset[ $annotation->name ?? $key ] = is_object($this->$key) ? Ulmus::convertObject($this->$key) : $this->$key;
+            if ( isset($this->$key) ) { 
+                $realKey = $annotation->name ?? $key;
+                
+                switch (true) {
+                    case is_object($this->$key):
+                        $dataset[$realKey] = Ulmus::convertObject($this->$key);
+                    break;
+                        
+                    case is_array($this->$key):    
+                        $dataset[$realKey] = Ulmus::encodeArray($this->$key);
+                    break;
+                    
+                    default:
+                       $dataset[$realKey] = $this->$key;
+                }
             }
             elseif ( $field['nullable'] ) {
                 $dataset[ $annotation->name ?? $key ] = null;
diff --git a/src/Query/Fragment.php b/src/Query/Fragment.php
index d17c3de..7754a2c 100644
--- a/src/Query/Fragment.php
+++ b/src/Query/Fragment.php
@@ -10,6 +10,6 @@ abstract class Fragment {
 
     protected function renderSegments(array $segments, string $glue = " ") : string
     {
-        return implode($glue, array_filter($segments));
+        return implode($glue, array_filter($segments, function($i) { return ! is_null($i) && $i !== false && $i !== ""; }));
     }
 }
diff --git a/src/Query/Insert.php b/src/Query/Insert.php
index 71da301..e1b9083 100644
--- a/src/Query/Insert.php
+++ b/src/Query/Insert.php
@@ -33,6 +33,6 @@ class Insert extends Fragment {
 
     protected function renderTable() : string
     {
-        return $this->table;
+        return "`$this->table`";
     }
 }
diff --git a/src/Query/Limit.php b/src/Query/Limit.php
index 346bc3e..244e8e6 100644
--- a/src/Query/Limit.php
+++ b/src/Query/Limit.php
@@ -19,8 +19,12 @@ class Limit extends Fragment {
 
     public function render() : string
     {
+        if ( $this->limit < 0 ) {
+            throw new \Exception("An error occured trying to render the LIMIT fragment ; given value has to be > 0. Received {$this->limit}");
+        }
+        
         return $this->renderSegments([
-            static::SQL_TOKEN, $this->limit
+            static::SQL_TOKEN, abs($this->limit)
         ]);
     }
 }
diff --git a/src/Query/Offset.php b/src/Query/Offset.php
index eb22c56..91d861c 100644
--- a/src/Query/Offset.php
+++ b/src/Query/Offset.php
@@ -13,11 +13,16 @@ class Offset extends Fragment {
     public function set($offset) : self
     {
         $this->offset = $offset;
+        
         return $this;
     }
 
     public function render() : string
     {
+        if ( $this->offset < 0 ) {
+            throw new \Exception("An error occured trying to render the OFFSET fragment ; given value has to be > 0. Received {$this->offset}");
+        }
+        
         return $this->renderSegments([
             static::SQL_TOKEN, $this->offset,
         ]);
diff --git a/src/Query/OrderBy.php b/src/Query/OrderBy.php
index cca9aca..5e62ad2 100644
--- a/src/Query/OrderBy.php
+++ b/src/Query/OrderBy.php
@@ -12,12 +12,14 @@ class OrderBy extends Fragment {
     public function set(array $order) : self
     {
         $this->orderBy = $order;
+        
         return $this;
     }
 
     public function add(string $field, ? string $direction = null) : self
     {
         $this->orderBy[] = [ $field, $direction ];
+        
         return $this;
     }
 
@@ -25,6 +27,7 @@ class OrderBy extends Fragment {
     {
         $list = array_map(function($item) {
             list($field, $direction) = $item;
+            
             return $field . ( $direction ? " $direction" : "" );
         }, $this->orderBy);
 
diff --git a/src/Query/Update.php b/src/Query/Update.php
index d825a40..dfd0050 100644
--- a/src/Query/Update.php
+++ b/src/Query/Update.php
@@ -24,12 +24,12 @@ class Update extends Fragment {
             'UPDATE',
             ( $this->priority ?? false ),
             ( $this->ignore ? 'IGNORE' : false ),
-            $this->table,
+            $this->renderTable(),
         ]);
     }
     
     protected function renderTable() : string
     {
-        return $this->table;
+        return "`$this->table`";
     }
 }
diff --git a/src/Query/Values.php b/src/Query/Values.php
index b7e8416..45fc348 100644
--- a/src/Query/Values.php
+++ b/src/Query/Values.php
@@ -33,7 +33,7 @@ class Values extends Fragment {
     public function render() : string
     {
         $this->queryBuilder->addValues($this->flattenRowsArray());
-                    
+          
         return $this->renderSegments([
             'VALUES', $this->renderParameterPlaceholders(),
         ]);
diff --git a/src/Query/Where.php b/src/Query/Where.php
index 00d656b..abd5a74 100644
--- a/src/Query/Where.php
+++ b/src/Query/Where.php
@@ -53,7 +53,7 @@ class Where extends Fragment {
     public function render() : string
     {
         $stack = [];
-
+        
         foreach ($this->conditionList ?? [] as $key => $item) {
             if ( $item instanceof Where ) {
                 if ( $item->conditionList ?? false ) {
diff --git a/src/QueryBuilder.php b/src/QueryBuilder.php
index a7d1ffd..af8b6ed 100644
--- a/src/QueryBuilder.php
+++ b/src/QueryBuilder.php
@@ -143,7 +143,13 @@ class QueryBuilder
 
     public function open(string $condition = Query\Where::CONDITION_AND) : self
     {
-        if ( null !== ($this->where ?? false) ) {
+        if ( null !== ($this->where ?? null) ) {
+            $this->where->conditionList[] = $new = new Query\Where($this, $condition);
+            $this->where = $new;
+        }
+        else {
+            $this->where = new Query\Where($this, $condition);
+            $this->push($this->where);
             $this->where->conditionList[] = $new = new Query\Where($this, $condition);
             $this->where = $new;
         }
@@ -153,7 +159,13 @@ class QueryBuilder
 
     public function close() : self
     {
-        if ( null !== ($this->where ?? false) && $this->where->parent ) {
+        if ( null !== ($this->where ?? null) && $this->where->parent ) {
+            
+            # if an enclosure was opened, and nothing done, we must remove the unused node
+            if ( empty($this->where->conditionList) && (count($this->where->parent->conditionList) === 1) ) {
+                unset($this->where->parent->conditionList);
+            }
+            
             $this->where = $this->where->parent;
         }
 
@@ -171,6 +183,7 @@ class QueryBuilder
         }
 
         $this->whereConditionOperator = $operator;
+
         $where->add($field, $value, $operator, $condition, $not);
         
         return $this;
@@ -200,7 +213,6 @@ class QueryBuilder
 
     public function groupBy() : self
     {
-        
         return $this;
     }
 
@@ -242,8 +254,6 @@ class QueryBuilder
 
     public function join(string $type, /*string | QueryBuilder*/ $table, $field, $value, bool $outer = false) : self
     {
-        #if ( null === $join = $this->getFragment(Query\Join::class) ) {#}
-
         $join = new Query\Join($this);
         $this->push($join);
         $join->set($type, $table, $field, $value);
diff --git a/src/Repository.php b/src/Repository.php
index 9219694..0f91da9 100644
--- a/src/Repository.php
+++ b/src/Repository.php
@@ -214,6 +214,32 @@ class Repository
         return $this;
     }
 
+    public function wheres(array $fieldValues, string $operator = Query\Where::OPERATOR_EQUAL) : self
+    {
+        foreach($fieldValues as $field => $value) {
+            if ( is_array($value) ) {
+                switch ($value[1]) {
+                    case Query\Where::CONDITION_AND:
+                        $this->where($field, $value[0], $operator);
+                    break;
+
+                    case Query\Where::CONDITION_OR:
+                        $this->or($field, $value[0], $operator);
+                    break;
+
+                    case Query\Where::CONDITION_NOT:
+                        $this->notWhere($field, $value[0], $operator);
+                    break;
+                }
+            }
+            else {
+                $this->where($field, $value, $operator);
+            }
+        }
+        
+        return $this;
+    }
+    
     public function and($field, $value, string $operator = Query\Where::OPERATOR_EQUAL) : self
     {
         return $this->where($field, $value, $operator);
@@ -233,9 +259,9 @@ class Repository
         return $this;
     }
 
-    public function orNot($field, $value, string $operator = Query\Where::OPERATOR_EQUAL) : self
+    public function orNot($field, $value, string $operator = Query\Where::OPERATOR_NOT_EQUAL) : self
     {
-        $this->queryBuilder->where($field, $value, $operator, Query\Where::CONDITION_OR, true);
+        $this->queryBuilder->notWhere($field, $value, $operator, Query\Where::CONDITION_OR, true);
         
         return $this;
     }
@@ -296,18 +322,51 @@ class Repository
 
     public function like($field, $value) : self
     {
-        $this->queryBuilder->where($field, $value, Query\Where::OPERATOR_LIKE, Query\Where::CONDITION_AND);
+        $this->where($field, $value, Query\Where::OPERATOR_LIKE);
+        
+        return $this;
+    }
+
+    public function orLike($field, $value) : self
+    {
+        $this->or($field, $value, Query\Where::OPERATOR_LIKE);
         
         return $this;
     }
 
     public function notLike($field, $value) : self
     {
-        $this->queryBuilder->where($field, $value, Query\Where::OPERATOR_LIKE, Query\Where::CONDITION_AND, true);
+        $this->notWhere($field, $value, Query\Where::OPERATOR_LIKE);
         
         return $this;
     }
 
+    public function likes(array $fieldValues, string $condition = Query\Where::CONDITION_AND) : self
+    {
+        foreach($fieldValues as $field => $value) {
+            if ( is_array($value) ) {
+                switch ($value[1]) {
+                    case Query\Where::CONDITION_AND:
+                        $this->like($field, $value[0]);
+                    break;
+
+                    case Query\Where::CONDITION_OR:
+                        $this->orLike($field, $value[0]);
+                    break;
+
+                    case Query\Where::CONDITION_NOT:
+                        $this->notLike($field, $value[0]);
+                    break;
+                }
+            }
+            else {
+                $this->like($field, $value);
+            }
+        }
+        
+        return $this;
+    }
+    
     public function match() : self
     {
 
@@ -330,10 +389,15 @@ class Repository
 
     public function groupBy() : self
     {
-        #$this->queryBuilder->groupBy();
         return $this;
     }
 
+    public function groups(array $groups) : self
+    {
+        # foreach($this->groups)
+        return $this;
+    }
+    
     public function orderBy($field, ? string $direction = null) : self
     {
         $this->queryBuilder->orderBy($field, $direction);
@@ -341,6 +405,16 @@ class Repository
         return $this;
     }
 
+    public function orders(array $orderList) : self
+    {
+        foreach($orderList as $field => $direction) {
+            $this->queryBuilder->orderBy($field, $direction);
+        }
+        
+        return $this;
+    }
+
+    
     public function limit(int $value) : self
     {
         $this->queryBuilder->limit($value);
@@ -375,7 +449,25 @@ class Repository
         
         return $this->where($primaryKeyField[$pkField]->name ?? $pkField, $value);
     }
-    
+ 
+    public function filterServerRequest(SearchRequest\SearchRequestInterface $searchRequest) : self 
+    {
+        $searchRequest->count = $searchRequest->filter( clone $this )
+            ->wheres($searchRequest->wheres(), Query\Where::OPERATOR_EQUAL, Query\Where::CONDITION_AND)
+            ->likes($searchRequest->likes(), Query\Where::CONDITION_OR)
+            ->orders($searchRequest->orders())
+            ->groups($searchRequest->groups())
+            ->count();
+        
+        return $searchRequest->filter($this)
+            ->wheres($searchRequest->wheres(), Query\Where::OPERATOR_EQUAL, Query\Where::CONDITION_AND)
+            ->likes($searchRequest->likes(), Query\Where::CONDITION_OR)
+            ->orders($searchRequest->orders())
+            ->groups($searchRequest->groups())
+            ->offset($searchRequest->offset())
+            ->limit($searchRequest->limit());
+    }
+       
     public function collectionFromQuery(? string $entityClass = null) : EntityCollection
     {
         
diff --git a/src/SearchRequest/SearchRequestInterface.php b/src/SearchRequest/SearchRequestInterface.php
new file mode 100644
index 0000000..b2ab579
--- /dev/null
+++ b/src/SearchRequest/SearchRequestInterface.php
@@ -0,0 +1,21 @@
+<?php
+
+namespace Ulmus\SearchRequest;
+
+use Ulmus\Repository;
+
+interface SearchRequestInterface {
+    public function filter(Repository $repository) : Repository;
+    
+    public function wheres() : iterable;
+    
+    public function likes() : iterable;
+    
+    public function orders() : iterable;
+    
+    public function groups() : iterable;
+    
+    public function limit() : int;
+    
+    public function offset() : int;
+}
diff --git a/src/SearchRequest/SearchRequestPaginationTrait.php b/src/SearchRequest/SearchRequestPaginationTrait.php
new file mode 100644
index 0000000..c4d0de9
--- /dev/null
+++ b/src/SearchRequest/SearchRequestPaginationTrait.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Ulmus\SearchRequest;
+
+trait SearchRequestPaginationTrait {
+
+    public int $count = 0;
+
+    public int $page = 1;
+
+    public int $pageCount = 0;
+    
+    public int $limit = 25;
+    
+    public function limit(): int 
+    {
+        return $this->limit;
+    }
+
+    public function offset(): int 
+    {
+        return abs( ( $this->page - 1 ) * $this->limit() );
+    }
+
+    public function pagination(int $page, int $itemCount) : void 
+    {
+        $this->count = $itemCount;
+        $this->page = $page;
+    }
+    
+    public function pageCount() : int
+    {
+        return ceil($this->count / $this->limit());
+    }
+    
+    public function hasPagination() : int
+    {
+        return $this->pageCount() > 1;
+    }
+}
diff --git a/src/SearchRequest/SearchableInterface.php b/src/SearchRequest/SearchableInterface.php
new file mode 100644
index 0000000..bbdc1db
--- /dev/null
+++ b/src/SearchRequest/SearchableInterface.php
@@ -0,0 +1,11 @@
+<?php
+
+namespace Ulmus\SearchRequest;
+
+use \Psr\Http\Message\ServerRequestInterface;
+
+interface SearchableInterface {
+    
+    public static function searchRequest(...$arguments) : SearchRequestInterface;
+    
+}
diff --git a/src/Ulmus.php b/src/Ulmus.php
index 5379b15..bee371c 100644
--- a/src/Ulmus.php
+++ b/src/Ulmus.php
@@ -29,6 +29,7 @@ abstract class Ulmus
         }
 
         $statement->closeCursor();
+        
         $queryBuilder->reset();
         
         return [
@@ -70,12 +71,17 @@ abstract class Ulmus
     {
         return ( static::$objectInstanciator ?? static::$objectInstanciator = new Entity\ObjectInstanciator() )->instanciate($type, $arguments);
     }
-        
+    
     public static function convertObject(object $obj)
     {
         return ( static::$objectInstanciator ?? static::$objectInstanciator = new Entity\ObjectInstanciator() )->convert($obj);
     }
     
+    public static function encodeArray(array $array)
+    {
+        return json_encode($array);
+    }
+    
     public static function registerAdapter(ConnectionAdapter $adapter, bool $default = false) : void
     {
         if ($default) {