Optimized memory used by database handlers

htdocs/lib/databases/mssql.lib.php

@@ -634,9 +634,9 @@ class DoliDb
 			1451 => 'DB_ERROR_CHILD_EXISTS'
 		     );
 			
-			if (isset($this->errorcode_map[$this->lasterrno]))
+			if (isset($errorcode_map[$this->lasterrno]))
 			{
-				return $this->errorcode_map[$this->lasterrno];
+				return $errorcode_map[$this->lasterrno];
 			}
 			$errno=$this->lasterrno;
 			return ($errno?'DB_ERROR_'.$errno:'0');

htdocs/lib/databases/mysql.lib.php

@@ -615,9 +615,9 @@ class DoliDb
 			1451 => 'DB_ERROR_CHILD_EXISTS'
 		     );
 			
-			if (isset($this->errorcode_map[mysql_errno($this->db)]))
+			if (isset($errorcode_map[mysql_errno($this->db)]))
 			{
-				return $this->errorcode_map[mysql_errno($this->db)];
+				return $errorcode_map[mysql_errno($this->db)];
 			}
 			$errno=mysql_errno($this->db);
 			return ($errno?'DB_ERROR_'.$errno:'0');

htdocs/lib/databases/mysqli.lib.php

@@ -632,9 +632,9 @@ class DoliDb
 			1451 => 'DB_ERROR_CHILD_EXISTS'
 		     );
 		
-			if (isset($this->errorcode_map[mysqli_errno($this->db)]))
+			if (isset($errorcode_map[mysqli_errno($this->db)]))
 			{
-				return $this->errorcode_map[mysqli_errno($this->db)];
+				return $errorcode_map[mysqli_errno($this->db)];
 			}
 			$errno=mysqli_errno($this->db);
 			return ($errno?'DB_ERROR_'.$errno:'0');