diff --git a/htdocs/admin/system/database-tables.php b/htdocs/admin/system/database-tables.php
index e75cec3f513..39b3dd4cad5 100644
--- a/htdocs/admin/system/database-tables.php
+++ b/htdocs/admin/system/database-tables.php
@@ -66,7 +66,8 @@ else if ($conf->db->type == 'mssql')
 	//$sqls[0] = "";
 	//$base=3;
 }
-else if ($conf->db->type == 'sqlite3') {
+else if ($conf->db->type == 'sqlite' || $conf->db->type == 'sqlite3')
+{
 	//$sql = "SELECT name, type FROM sqlite_master";
 	$base = 4;
 }
@@ -176,7 +177,7 @@ else
 
 	if ($base == 4)
 	{
-		// Sqlite3
+		// Sqlite by PDO or by Sqlite3
 		print '<table class="noborder">';
 		print '<tr class="liste_titre">';
 		print '<td>'.$langs->trans("TableName").'</td>';
diff --git a/htdocs/core/db/sqlite.class.php b/htdocs/core/db/sqlite.class.php
index 786bf435fcf..88efde86394 100644
--- a/htdocs/core/db/sqlite.class.php
+++ b/htdocs/core/db/sqlite.class.php
@@ -40,12 +40,6 @@ class DoliDBSqlite extends DoliDB
 	//! Resultset of last query
 	private $_results;
 
-	/**
-	 * Indique que les fonctions personnalisées sont définies
-	 * @var boolean
-	 */
-	private static $customFunctionsDefined = false;
-
     /**
 	 *	Constructor.
 	 *	This create an opened connexion to a database server and eventually to a database
@@ -56,6 +50,7 @@ class DoliDBSqlite extends DoliDB
 	 *	@param	    string	$pass		Mot de passe
 	 *	@param	    string	$name		Nom de la database
 	 *	@param	    int		$port		Port of database server
+	 *	@return	    int					1 if OK, 0 if not
      */
     function __construct($type, $host, $user, $pass, $name='', $port=0)
     {
@@ -159,7 +154,7 @@ class DoliDBSqlite extends DoliDB
 
     			// Process case: "CREATE TABLE llx_mytable(rowid integer NOT NULL AUTO_INCREMENT PRIMARY KEY,code..."
     			if (preg_match('/[\s\t\(]*(\w*)[\s\t]+int.*auto_increment/i',$line,$reg)) {
-    				$newline=preg_replace('/([\s\t\(]*)([a-zA-Z_0-9]*)[\s\t]+int.*auto_increment[^,]*/i','\\1 \\2 integer PRIMARY KEY AUTOINCREMENT',$line);
+    				$newline=preg_replace('/([\s\t\(]*)([a-zA-Z_0-9]*)[\s\t]+int.*auto_increment[^,]*/i','\\1 \\2 SERIAL PRIMARY KEY',$line);
                     //$line = "-- ".$line." replaced by --\n".$newline;
                     $line=$newline;
     			}
@@ -248,18 +243,11 @@ class DoliDBSqlite extends DoliDB
     				$line = "-- ".$line." replaced by --\n";
     				$line.= "CREATE ".(preg_match('/UNIQUE/',$reg[2])?'UNIQUE ':'')."INDEX ".$idxname." ON ".$tablename." (".$fieldlist.")";
     			}
-				if (preg_match('/ALTER\s+TABLE\s*(.*)\s*ADD\s+CONSTRAINT\s+(.*)\s*FOREIGN\s+KEY\s*\(([\w,\s]+)\)\s*REFERENCES\s+(\w+)\s*\(([\w,\s]+)\)/i',$line, $reg)) {
-					// Pour l'instant les contraintes ne sont pas créées
-					dol_syslog(get_class().'::query line emptied');
-					$line = 'SELECT 0;';
-
-				}
-
-				//if (preg_match('/rowid\s+.*\s+PRIMARY\s+KEY,/i', $line)) {
-					//preg_replace('/(rowid\s+.*\s+PRIMARY\s+KEY\s*,)/i', '/* \\1 */', $line);
-				//}
             }
 
+            // To have postgresql case sensitive
+            $line=str_replace(' LIKE \'',' ILIKE \'',$line);
+
 			// Delete using criteria on other table must not declare twice the deleted table
 			// DELETE FROM tabletodelete USING tabletodelete, othertable -> DELETE FROM tabletodelete USING othertable
 			if (preg_match('/DELETE FROM ([a-z_]+) USING ([a-z_]+), ([a-z_]+)/i',$line,$reg))
@@ -400,53 +388,7 @@ class DoliDBSqlite extends DoliDB
         $this->error = 0;
 
 		// Convert MySQL syntax to SQLite syntax
-		if (preg_match('/ALTER\s+TABLE\s*(.*)\s*ADD\s+CONSTRAINT\s+(.*)\s*FOREIGN\s+KEY\s*\(([\w,\s]+)\)\s*REFERENCES\s+(\w+)\s*\(([\w,\s]+)\)/i',$query, $reg)) {
-			// Ajout d'une clef étrangère à la table
-			// procédure de remplacement de la table pour ajouter la contrainte
-			// Exemple : ALTER TABLE llx_adherent ADD CONSTRAINT adherent_fk_soc FOREIGN KEY (fk_soc) REFERENCES llx_societe (rowid)
-			// -> CREATE TABLE ( ... ,CONSTRAINT adherent_fk_soc FOREIGN KEY (fk_soc) REFERENCES llx_societe (rowid))
-			$foreignFields = $reg[5];
-			$foreignTable = $reg[4];
-			$localfields = $reg[3];
-			$constraintname=trim($reg[2]);
-			$tablename=trim($reg[1]);
-
-			$res = $this->db->query("SELECT sql FROM sqlite_master WHERE name='" . $tablename . "'");
-			$descTable = $res->fetchColumn();
-			$res->closeCursor();
-
-			// 1- Renommer la table avec un nom temporaire
-			$res = $this->query('ALTER TABLE ' . $tablename . ' RENAME TO tmp_' . $tablename);
-			$res->closeCursor();
-
-			// 2- Recréer la table avec la contrainte ajoutée
-
-			// on bricole la requete pour ajouter la contrainte
-			$descTable = substr($descTable, 0, strlen($descTable) - 1);
-			$descTable .= ", CONSTRAINT " . $constraintname . " FOREIGN KEY (" . $localfields . ") REFERENCES " .$foreignTable . "(" . $foreignFields . ")";
-
-			// fermeture de l'instruction
-			$descTable .= ')';
-
-			// Création proprement dite de la table
-			$res = $this->query($descTable);
-			$res->closeCursor();
-
-			// 3- Transférer les données
-			$res = $this->query('INSERT INTO ' . $tablename . ' SELECT * FROM tmp_' . $tablename);
-			$res->closeCursor();
-
-
-			// 4- Supprimer la table temporaire
-			$res = $this->query('DROP TABLE tmp_' . $tablename);
-			$res->closeCursor();
-
-			// dummy statement
-			$query="SELECT 0";
-
-		} else {
-			$query=$this->convertSQLFromMysql($query,$type);
-		}
+		$query=$this->convertSQLFromMysql($query,$type);
 		//print "After convertSQLFromMysql:\n".$query."<br>\n";
 
 	    dol_syslog('sql='.$query, LOG_DEBUG);
@@ -546,11 +488,7 @@ class DoliDBSqlite extends DoliDB
     {
         // If resultset not provided, we take the last used by connexion
         if (! is_object($resultset)) { $resultset=$this->_results; }
-		if (preg_match("/^SELECT/i", $resultset->queryString)) {
-			$res = $this->db->query("SELECT count(*) FROM (" . $resultset->queryString . ") q");
-			return $res->fetchColumn();
-		}
-		return $resultset->rowCount();
+        return $resultset->rowCount();
     }
 
     /**
@@ -592,12 +530,7 @@ class DoliDBSqlite extends DoliDB
 	 */
     function escape($stringtoencode)
     {
-		$ret = $this->db->quote($stringtoencode);
-		$l = strlen($ret);
-		if ($l >= 2) {
-			return substr($ret, 1, $l -2);
-		}
-		return '';
+        return $this->db->quote($stringtoencode);
     }
 
     /**
@@ -1203,6 +1136,5 @@ class DoliDBSqlite extends DoliDB
 
         return $result;
     }
-
 }
 
diff --git a/htdocs/core/db/sqlite3.class.php b/htdocs/core/db/sqlite3.class.php
index c52578fa579..ce3762202e4 100644
--- a/htdocs/core/db/sqlite3.class.php
+++ b/htdocs/core/db/sqlite3.class.php
@@ -354,7 +354,8 @@ class DoliDBSqlite3 extends DoliDB
      */
     function getVersion()
     {
-        return $this->db->version()['versionString'];
+    	$tmp=$this->db->version();
+        return $tmp['versionString'];
     }
 
     /**
diff --git a/htdocs/install/etape2.php b/htdocs/install/etape2.php
index 612c3c64148..8c0e3f8ab5c 100644
--- a/htdocs/install/etape2.php
+++ b/htdocs/install/etape2.php
@@ -51,7 +51,8 @@ if ($dolibarr_main_db_type == "mysql")  $choix=1;
 if ($dolibarr_main_db_type == "mysqli") $choix=1;
 if ($dolibarr_main_db_type == "pgsql")  $choix=2;
 if ($dolibarr_main_db_type == "mssql")  $choix=3;
-if ($dolibarr_main_db_type == "sqlite3")  $choix=4;
+if ($dolibarr_main_db_type == "sqlite")  $choix=4;
+if ($dolibarr_main_db_type == "sqlite3")  $choix=5;
 
 //if (empty($choix)) dol_print_error('','Database type '.$dolibarr_main_db_type.' not supported into etape2.php page');
 
diff --git a/htdocs/install/fileconf.php b/htdocs/install/fileconf.php
index ec3e208374b..5dce328d04c 100644
--- a/htdocs/install/fileconf.php
+++ b/htdocs/install/fileconf.php
@@ -306,7 +306,7 @@ if (! empty($force_install_message))
                     $class='DoliDB'.ucfirst($type);
                     include_once $dir."/".$file;
 
-                    if ($type == 'sqlite') continue;    // We hide sqlite because support can't be complete unti sqlit does not manage foreign key creation after table creation
+                    if ($type == 'sqlite') continue;    // We hide sqlite because support can't be complete until sqlite does not manage foreign key creation after table creation
 
 		            // Version min of database
                     $versionbasemin=explode('.',$class::VERSIONMIN);
@@ -320,6 +320,7 @@ if (! empty($force_install_message))
 		            if ($type=='mysqli') { $testfunction='mysqli_connect'; $testclass=''; }
 		            if ($type=='pgsql')  { $testfunction='pg_connect'; $testclass=''; }
 		            if ($type=='mssql')  { $testfunction='mssql_connect'; $testclass=''; }
+		        	if ($type=='sqlite') { $testfunction=''; $testclass='PDO'; }
 		            if ($type=='sqlite3') { $testfunction=''; $testclass='SQLite3'; }
 		            $option.='<option value="'.$type.'"'.($defaultype == $type?' selected="selected"':'');
 		            if ($testfunction && ! function_exists($testfunction)) $option.=' disabled="disabled"';