diff --git a/src/Annotation/Property/Field/Id.php b/src/Annotation/Property/Field/Id.php
index 029277a..931b0ae 100644
--- a/src/Annotation/Property/Field/Id.php
+++ b/src/Annotation/Property/Field/Id.php
@@ -9,6 +9,7 @@ class Id extends \Ulmus\Annotation\Property\Field {
         $this->nullable = false;
         $this->attributes['unsigned'] = true;
         $this->attributes['primary_key'] = true;
+        $this->attributes['auto_increment'] = true;
         
         parent::__construct('int');
     }
diff --git a/src/Common/PdoObject.php b/src/Common/PdoObject.php
index f564f70..eeb39fd 100644
--- a/src/Common/PdoObject.php
+++ b/src/Common/PdoObject.php
@@ -2,56 +2,57 @@
 
 namespace Ulmus\Common;
 
-use PDO, PDOStatement;
+use PDO,
+    PDOStatement;
 
 class PdoObject extends PDO {
 
-    public function select(string $sql, array $parameters = []) : PDOStatement
-    {
-#        var_dump($sql, $parameters);
- #       die();
+    public function select(string $sql, array $parameters = []): PDOStatement {
         try {
-            if ( false !== ( $statement = $this->prepare($sql) ) ) {
+            if (false !== ( $statement = $this->prepare($sql) )) {
                 $statement = $this->execute($statement, $parameters, false);
                 $statement->setFetchMode(\PDO::FETCH_ASSOC);
-                
+
                 return $statement;
             }
-        } catch (\PDOException $e) { throw $e; }
+        } catch (\PDOException $e) {
+            throw $e;
+        }
     }
 
-    public function runQuery(string $sql, array $parameters = []) : PDOStatement
-    {
+    public function runQuery(string $sql, array $parameters = []): PDOStatement {
         try {
-            if ( false !== ( $statement = $this->prepare($sql) ) ) {
+            if (false !== ( $statement = $this->prepare($sql) )) {
                 return $this->execute($statement, $parameters, true);
             }
-        } catch (\PDOException $e) { throw $e; }
+        } catch (\PDOException $e) {
+            throw $e;
+        }
     }
-    
-    public function execute(PDOStatement $statement, array $parameters = [], bool $commit = true) : ? PDOStatement
-    {
-       try {
-           if (! $this->inTransaction() ) {
-               $this->beginTransaction();
-           }
-           
-           if ( empty($parameters) ? $statement->execute() : $statement->execute($parameters) ) {
-                if ( $commit ) {
-                   $this->commit();
+
+    public function execute(PDOStatement $statement, array $parameters = [], bool $commit = true): ?PDOStatement {
+        try {
+            if (!$this->inTransaction()) {
+                $this->beginTransaction();
+            }
+
+            if (empty($parameters) ? $statement->execute() : $statement->execute($parameters)) {
+                $statement->lastInsertId = $this->lastInsertId();
+
+                if ($commit) {
+                    $this->commit();
                 }
 
-               return $statement;
-           }
-           else {
-               throw new PDOException('Could not begin transaction or given statement is invalid.');
-           }
-       } catch (\PDOException $e) {
-           $this->rollback();
-           throw $e;
-       }
+                return $statement;
+            } else {
+                throw new PDOException('Could not begin transaction or given statement is invalid.');
+            }
+        } catch (\PDOException $e) {
+            $this->rollback();
+            throw $e;
+        }
 
-       return null;
-   }
+        return null;
+    }
 
 }
diff --git a/src/EntityTrait.php b/src/EntityTrait.php
index 95bb377..c91928f 100644
--- a/src/EntityTrait.php
+++ b/src/EntityTrait.php
@@ -121,11 +121,21 @@ trait EntityTrait {
     
     public function entityGetDataset() : array
     {
-        $fields = array_keys($this->resolveEntity()->fieldList());
+        $dataset = [];
+        $entityResolver = $this->resolveEntity();
+        
+        foreach($entityResolver->fieldList() as $key => $field) {
+            $annotation = $entityResolver->searchFieldAnnotation($key, new Field() );
 
-        return array_combine($fields, array_map(function(string $key) {
-            return $this->$key; 
-        }, $fields));
+            if ( isset($this->$key) ) {                
+                $dataset[ $annotation->name ?? $key ] = $this->$key;
+            }
+            elseif ( $field['nullable'] ) {
+                $dataset[ $annotation->name ?? $key ] = null;
+            }
+        }
+        
+        return $dataset;
     }
     
     public function toArray() : array
diff --git a/src/Exception/EntityRequiredField.php b/src/Exception/EntityRequiredField.php
new file mode 100644
index 0000000..bb21b14
--- /dev/null
+++ b/src/Exception/EntityRequiredField.php
@@ -0,0 +1,5 @@
+<?php
+
+namespace Ulmus\Exception;
+
+class EntityRequiredField extends \RuntimeException {}
diff --git a/src/Query/Insert.php b/src/Query/Insert.php
index 9c851ab..6aac5bf 100644
--- a/src/Query/Insert.php
+++ b/src/Query/Insert.php
@@ -31,6 +31,6 @@ class Insert extends Fragment {
 
     protected function renderTable() : string
     {
-        return $this->table . ( $this->alias ? " {$this->alias}" : "" );
+        return $this->table;
     }
 }
diff --git a/src/Query/Set.php b/src/Query/Set.php
new file mode 100644
index 0000000..07e9939
--- /dev/null
+++ b/src/Query/Set.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Ulmus\Query;
+
+use Ulmus\QueryBuilder;
+
+class Set extends Fragment {
+
+    public int $order = 0;
+    
+    public array $dataset;
+    
+    public QueryBuilder $queryBuilder;
+
+    public function __construct(QueryBuilder $queryBuilder)
+    {
+        $this->queryBuilder = $queryBuilder;
+    }
+    
+    public function set(array $dataset) : self
+    {
+        $this->dataset = $dataset;
+        
+        return $this;
+    }
+
+    public function render() : string
+    {                    
+        return $this->renderSegments([
+            'SET', $this->renderParameterPlaceholders(),
+        ]);
+    }
+    
+    public function renderParameterPlaceholders() : string 
+    {        
+        $keys = [];
+        
+        foreach($this->dataset as $key =>$value) {
+            $this->queryBuilder->addParameter($value, ":v_$key");
+            $keys[] = "$key=:v_$key";
+        }
+        
+        return implode(",", $keys);
+    }
+}
\ No newline at end of file
diff --git a/src/Query/Update.php b/src/Query/Update.php
new file mode 100644
index 0000000..d825a40
--- /dev/null
+++ b/src/Query/Update.php
@@ -0,0 +1,35 @@
+<?php
+
+namespace Ulmus\Query;
+
+class Update extends Fragment {
+
+    public int $order = -100;
+
+    public bool $quick = false;
+    
+    public bool $ignore = false;
+    
+    public array $fieldlist = [];
+    
+    public string $priority;
+    
+    public string $table;
+    
+    public ? string $alias = null;
+    
+    public function render() : string
+    {
+        return $this->renderSegments([
+            'UPDATE',
+            ( $this->priority ?? false ),
+            ( $this->ignore ? 'IGNORE' : false ),
+            $this->table,
+        ]);
+    }
+    
+    protected function renderTable() : string
+    {
+        return $this->table;
+    }
+}
diff --git a/src/Query/Values.php b/src/Query/Values.php
index a0f9663..b7e8416 100644
--- a/src/Query/Values.php
+++ b/src/Query/Values.php
@@ -2,10 +2,14 @@
 
 namespace Ulmus\Query;
 
+use Ulmus\QueryBuilder;
+
 class Values extends Fragment {
 
     public int $order = 0;
     
+    public ? int $fieldCount = null;
+    
     public array $rows;
     
     public QueryBuilder $queryBuilder;
@@ -17,36 +21,38 @@ class Values extends Fragment {
     
     public function add(array $row) : self
     {
-        $this->rows[] = $row;
+        if ($this->fieldCount === null) {        
+            $this->fieldCount = count($row);
+        }
+        
+        $this->rows[] = array_values($row);
         
         return $this;
     }
 
     public function render() : string
     {
-        $this->queryBuilder->addParameter($this->flattenRowsArray());
+        $this->queryBuilder->addValues($this->flattenRowsArray());
                     
         return $this->renderSegments([
-            'VALUES', '(' . $this->renderParameterPlaceholders() . ')',
+            'VALUES', $this->renderParameterPlaceholders(),
         ]);
     }
     
     public function renderParameterPlaceholders() : string 
     {
         $return = [];
-        $count = null;
         
         foreach($this->rows as $row) {
-            if ($count === null) {
-                $count = count($row);
+            if ($this->fieldCount === null) {
             }
             else {
-                if (count($row) !== $count) {
+                if (count($row) !== $this->fieldCount) {
                     throw new \Exception("Insert statement must contains the same number of values for each rows.");
                 }
             }
             
-            $return[] = implode(',', array_fill(0, $this->parameterCount, '?'));
+            $return[] = implode(',', array_fill(0, $this->fieldCount, '?'));
         }
         
         return "(" . implode('),(', $return) . ")";
@@ -54,6 +60,6 @@ class Values extends Fragment {
     
     public function flattenRowsArray() : array
     {
-        return iterator_to_array(new RecursiveIteratorIterator(new RecursiveArrayIterator($this->rows)));
+        return \iterator_to_array(new \RecursiveIteratorIterator(new \RecursiveArrayIterator($this->rows)));
     }
 }
\ No newline at end of file
diff --git a/src/QueryBuilder.php b/src/QueryBuilder.php
index 8b45f5c..94cbc58 100644
--- a/src/QueryBuilder.php
+++ b/src/QueryBuilder.php
@@ -51,7 +51,7 @@ class QueryBuilder
             $insert = new Query\Insert();
             $this->push($insert);
             
-            $insert->fieldist = $fieldlist;
+            $insert->fieldlist = $fieldlist;
             $insert->alias = $alias;
             $insert->table = $table;
         }
@@ -63,7 +63,7 @@ class QueryBuilder
     {
         
         if ( false === ( $values = $this->has(Query\Values::class) ) ) {
-            $values = new Query\Values();
+            $values = new Query\Values($this);
             $this->push($values);
         }
         
@@ -72,6 +72,40 @@ class QueryBuilder
         return $this;
     }
     
+    public function update(string $table, ? string $alias = null, ? string $database = null, ? string $schema = null) : self
+    {
+        if ( ! $this->has(Query\Update::class) ) {            
+            if ( $database ) {
+                $table = "\"$database\".$table";
+            }
+
+            if ( $schema ) {
+                $table = "\"$schema\".$table";
+            }
+
+            $update = new Query\Update();
+            $this->push($update);
+            
+            $update->alias = $alias;
+            $update->table = $table;
+        }
+
+        return $this;
+    }
+
+    public function set(array $dataset) : self 
+    {
+        
+        if ( false === ( $values = $this->has(Query\Set::class) ) ) {
+            $set = new Query\Set($this);
+            $this->push($set);
+        }
+        
+        $set->set($dataset);
+        
+        return $this;
+    }
+    
     public function delete() : self
     {
         if ( ! $this->has(Query\Delete::class) ) {
@@ -180,12 +214,14 @@ class QueryBuilder
         }
 
         $orderBy->add($field, $direction);
+        
         return $this;
     }
 
     public function push(Query\Fragment $queryFragment) : self
     {
         $this->queryStack[] = $queryFragment;
+        
         return $this;
     }
 
@@ -226,10 +262,12 @@ class QueryBuilder
         }
 
         $this->parameters[$key] = $value;
+        
         return $key;
     }
     
-    public function addValues(array $values) {
+    public function addValues(array $values) : void
+    {
         $this->values = $values;
     }
 }
diff --git a/src/Repository.php b/src/Repository.php
index 5b93626..9004f54 100644
--- a/src/Repository.php
+++ b/src/Repository.php
@@ -68,19 +68,35 @@ class Repository
     }
 
     public function deleteFromPk($value, $primaryKey = "id") 
-    {    
+    {
         return $this->where($primaryKey, $value)->deleteOne();
     }
     
     public function save(object $entity) : bool
-    {
+    {        
         $dataset = $entity->toArray();
-                
+        $primaryKeyDefinition = Ulmus::resolveEntity($this->entityClass)->getPrimaryKeyField();
+
         if ( ! $entity->isLoaded() ) {
-            $save = $this->insertSqlQuery($dataset)->runQuery();
+            $statement = $this->insertSqlQuery($dataset)->runQuery();
+            
+            if ( ( 0 !== $statement->lastInsertId ) && 
+               ( null !== $primaryKeyDefinition )) {
+                $pkField = key($primaryKeyDefinition);
+                $entity->$pkField = $statement->lastInsertId;
+            }
         }
         else {
-            $save = $this->updateSqlQuery($dataset)->runQuery();
+            if ($primaryKeyDefinition === null) {
+                throw new \Exception(sprintf("No primary key found for entity %s", $this->entityClass));
+            }
+            
+            $pkField = key($primaryKeyDefinition);
+            $pkFieldName = $primaryKeyDefinition[$pkField]->name ?? $pkField;
+            $this->where($pkFieldName, $dataset[$pkFieldName]);
+
+            # DATASET MUST BE DIFF OF MODIF ONLY !
+            $update = $this->updateSqlQuery($dataset)->runQuery();
         }
         
         return false;
@@ -119,6 +135,20 @@ class Repository
         return $this;
     }
     
+    public function update(array $fieldlist, string $table, string $alias, ? string $schema) : self
+    {
+        $this->queryBuilder->update($table, $alias, $schema);
+        
+        return $this;
+    }
+    
+    public function set(array $dataset) : self
+    {
+        $this->queryBuilder->set($dataset);
+        
+        return $this;
+    }
+    
     public function delete() : self
     {
         $this->queryBuilder->delete($this->alias);
@@ -176,7 +206,7 @@ class Repository
         return $this;
     }
 
-    public function notWhere(array $condition) : self
+    public function notWhere($field, $value, string $operator = Query\Where::OPERATOR_NOT_EQUAL) : self
     {
         $this->queryBuilder->where($field, $value, $operator, Query\Where::CONDITION_AND, true);
         
@@ -269,18 +299,21 @@ class Repository
     public function orderBy(string $field, ? string $direction = null) : self
     {
         $this->queryBuilder->orderBy($field, $direction);
+        
         return $this;
     }
 
     public function limit(int $value) : self
     {
         $this->queryBuilder->limit($value);
+        
         return $this;
     }
 
     public function offset(int $value) : self
     {
         $this->queryBuilder->offset($value);
+        
         return $this;
     }
 
@@ -314,7 +347,7 @@ class Repository
         return $entityCollection;
     }
 
-    public function runQuery()
+    public function runQuery() : \PDOStatement
     {
         return Ulmus::runQuery($this->queryBuilder);
     }
@@ -322,10 +355,10 @@ class Repository
     protected function insertSqlQuery(array $dataset) : self
     {
         if ( ! $this->queryBuilder->has(Query\Insert::class) ) {
-            $this->insert(array_keys($dataset));
+            $this->insert(array_keys($dataset), $this->entityResolver->tableName(), $this->alias, $this->entityResolver->schemaName());
         }
 
-        $this->values(count($dataset));
+        $this->values($dataset);
 
         return $this;
     }
@@ -333,8 +366,10 @@ class Repository
     protected function updateSqlQuery(array $dataset) : self
     {
         if ( ! $this->queryBuilder->has(Query\Update::class) ) {
-            # $this->insert();
+            $this->update($dataset, $this->entityResolver->tableName(), $this->alias, $this->entityResolver->schemaName());
         }
+        
+        $this->set($dataset);
 
         return $this;
     }
diff --git a/src/Ulmus.php b/src/Ulmus.php
index 3ca3ca3..2132cae 100644
--- a/src/Ulmus.php
+++ b/src/Ulmus.php
@@ -32,9 +32,14 @@ abstract class Ulmus
         ];
     }
     
+    public static function pdo(?ConnectionAdapter $adapter = null) : Common\PdoObject
+    {
+        return ( $adapter ?: static::$defaultAdapter )->pdo;
+    }
+    
     public static function runQuery(QueryBuilder $queryBuilder, ?ConnectionAdapter $adapter = null)
     {
-        return ( $adapter ?: static::$defaultAdapter )->pdo->runQuery($queryBuilder->render(), $queryBuilder->parameters ?? []);
+        return static::pdo($adapter)->runQuery($queryBuilder->render(), array_merge($queryBuilder->values ?? [], $queryBuilder->parameters ?? []));
     }
 
     public static function resolveEntity(string $entityClass) : Common\EntityResolver