diff --git a/htdocs/core/modules/mailings/modules_mailings.php b/htdocs/core/modules/mailings/modules_mailings.php
index e45bd655ef3f6..9605cbe901960 100644
--- a/htdocs/core/modules/mailings/modules_mailings.php
+++ b/htdocs/core/modules/mailings/modules_mailings.php
@@ -169,14 +169,14 @@ public function update_nb($mailing_id)
 	{
 		// phpcs:enable
 		// Mise a jour nombre de destinataire dans table des mailings
-		$sql = "SELECT COUNT(*) nb FROM ".MAIN_DB_PREFIX."mailing_cibles";
+		$sql = "SELECT COUNT(*) nb FROM ".$this->db->prefix()."mailing_cibles";
 		$sql .= " WHERE fk_mailing = ".((int) $mailing_id);
 		$result = $this->db->query($sql);
 		if ($result) {
 			$obj = $this->db->fetch_object($result);
 			$nb = $obj->nb;
 
-			$sql = "UPDATE ".MAIN_DB_PREFIX."mailing";
+			$sql = "UPDATE ".$this->db->prefix()."mailing";
 			$sql .= " SET nbemail = ".((int) $nb)." WHERE rowid = ".((int) $mailing_id);
 			if (!$this->db->query($sql)) {
 				dol_syslog($this->db->error());
@@ -208,7 +208,7 @@ public function addTargetsToDatabase($mailing_id, $cibles)
 		$num = count($cibles);
 		foreach ($cibles as $targetarray) {
 			if (!empty($targetarray['email'])) { // avoid empty email address
-				$sql = "INSERT INTO ".MAIN_DB_PREFIX."mailing_cibles";
+				$sql = "INSERT INTO ".$this->db->prefix()."mailing_cibles";
 				$sql .= " (fk_mailing,";
 				$sql .= " fk_contact,";
 				$sql .= " lastname, firstname, email, other, source_url, source_id,";
@@ -244,27 +244,27 @@ public function addTargetsToDatabase($mailing_id, $cibles)
 
 		/*
 		//Update the status to show thirdparty mail that don't want to be contacted anymore'
-		$sql = "UPDATE ".MAIN_DB_PREFIX."mailing_cibles";
+		$sql = "UPDATE ".$this->db->prefix()."mailing_cibles";
 		$sql .= " SET statut=3";
-		$sql .= " WHERE fk_mailing = ".((int) $mailing_id)." AND email in (SELECT email FROM ".MAIN_DB_PREFIX."societe where fk_stcomm=-1)";
+		$sql .= " WHERE fk_mailing = ".((int) $mailing_id)." AND email in (SELECT email FROM ".$this->db->prefix()."societe where fk_stcomm=-1)";
 		$sql .= " AND source_type='thirdparty'";
 		dol_syslog(__METHOD__.": mailing update status to display thirdparty mail that do not want to be contacted");
 		$result=$this->db->query($sql);
 
 		//Update the status to show contact mail that don't want to be contacted anymore'
-		$sql = "UPDATE ".MAIN_DB_PREFIX."mailing_cibles";
+		$sql = "UPDATE ".$this->db->prefix()."mailing_cibles";
 		$sql .= " SET statut=3";
-		$sql .= " WHERE fk_mailing = ".((int) $mailing_id)." AND source_type='contact' AND (email in (SELECT sc.email FROM ".MAIN_DB_PREFIX."socpeople AS sc ";
-		$sql .= " INNER JOIN ".MAIN_DB_PREFIX."societe s ON s.rowid=sc.fk_soc WHERE s.fk_stcomm=-1 OR no_email=1))";
+		$sql .= " WHERE fk_mailing = ".((int) $mailing_id)." AND source_type='contact' AND (email in (SELECT sc.email FROM ".$this->db->prefix()."socpeople AS sc ";
+		$sql .= " INNER JOIN ".$this->db->prefix()."societe s ON s.rowid=sc.fk_soc WHERE s.fk_stcomm=-1 OR no_email=1))";
 		dol_syslog(__METHOD__.": mailing update status to display contact mail that do not want to be contacted",LOG_DEBUG);
 		$result=$this->db->query($sql);
 		*/
 
 		if (empty($this->evenunsubscribe)) {
-			$sql = "UPDATE ".MAIN_DB_PREFIX."mailing_cibles as mc";
+			$sql = "UPDATE ".$this->db->prefix()."mailing_cibles as mc";
 			$sql .= " SET mc.statut = 3";
 			$sql .= " WHERE mc.fk_mailing = ".((int) $mailing_id);
-			$sql .= " AND EXISTS (SELECT rowid FROM ".MAIN_DB_PREFIX."mailing_unsubscribe as mu WHERE mu.email = mc.email and mu.entity = ".((int) $conf->entity).")";
+			$sql .= " AND EXISTS (SELECT rowid FROM ".$this->db->prefix()."mailing_unsubscribe as mu WHERE mu.email = mc.email and mu.entity = ".((int) $conf->entity).")";
 
 			dol_syslog(__METHOD__.":mailing update status to display emails that do not want to be contacted anymore", LOG_DEBUG);
 			$result = $this->db->query($sql);
@@ -291,7 +291,7 @@ public function addTargetsToDatabase($mailing_id, $cibles)
 	public function clear_target($mailing_id)
 	{
 		// phpcs:enable
-		$sql = "DELETE FROM ".MAIN_DB_PREFIX."mailing_cibles";
+		$sql = "DELETE FROM ".$this->db->prefix()."mailing_cibles";
 		$sql .= " WHERE fk_mailing = ".((int) $mailing_id);
 
 		if (!$this->db->query($sql)) {
diff --git a/htdocs/modulebuilder/template/admin/setup.php b/htdocs/modulebuilder/template/admin/setup.php
index d7d87fe8f1e22..306a28aa5b92e 100644
--- a/htdocs/modulebuilder/template/admin/setup.php
+++ b/htdocs/modulebuilder/template/admin/setup.php
@@ -478,7 +478,7 @@
 		// Load array def with activated templates
 		$def = array();
 		$sql = "SELECT nom";
-		$sql .= " FROM ".MAIN_DB_PREFIX."document_model";
+		$sql .= " FROM ".$db->prefix()."document_model";
 		$sql .= " WHERE type = '".$db->escape($type)."'";
 		$sql .= " AND entity = ".$conf->entity;
 		$resql = $db->query($sql);
diff --git a/htdocs/modulebuilder/template/class/api_mymodule.class.php b/htdocs/modulebuilder/template/class/api_mymodule.class.php
index 14b89da504c7b..e67def67c0caf 100644
--- a/htdocs/modulebuilder/template/class/api_mymodule.class.php
+++ b/htdocs/modulebuilder/template/class/api_mymodule.class.php
@@ -136,8 +136,8 @@ public function index($sortfield = "t.rowid", $sortorder = 'ASC', $limit = 100,
 		}
 
 		$sql = "SELECT t.rowid";
-		$sql .= " FROM ".MAIN_DB_PREFIX.$tmpobject->table_element." AS t";
-		$sql .= " LEFT JOIN ".MAIN_DB_PREFIX.$tmpobject->table_element."_extrafields AS ef ON (ef.fk_object = t.rowid)"; // Modification VMR Global Solutions to include extrafields as search parameters in the API GET call, so we will be able to filter on extrafields
+		$sql .= " FROM ".$this->db->prefix().$tmpobject->table_element." AS t";
+		$sql .= " LEFT JOIN ".$this->db->prefix().$tmpobject->table_element."_extrafields AS ef ON (ef.fk_object = t.rowid)"; // Modification VMR Global Solutions to include extrafields as search parameters in the API GET call, so we will be able to filter on extrafields
 		$sql .= " WHERE 1 = 1";
 		if ($tmpobject->ismultientitymanaged) {
 			$sql .= ' AND t.entity IN ('.getEntity($tmpobject->element).')';
@@ -148,9 +148,9 @@ public function index($sortfield = "t.rowid", $sortorder = 'ASC', $limit = 100,
 		// Search on sale representative
 		if ($search_sale && $search_sale != '-1') {
 			if ($search_sale == -2) {
-				$sql .= " AND NOT EXISTS (SELECT sc.fk_soc FROM ".MAIN_DB_PREFIX."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc)";
+				$sql .= " AND NOT EXISTS (SELECT sc.fk_soc FROM ".$this->db->prefix()."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc)";
 			} elseif ($search_sale > 0) {
-				$sql .= " AND EXISTS (SELECT sc.fk_soc FROM ".MAIN_DB_PREFIX."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc AND sc.fk_user = ".((int) $search_sale).")";
+				$sql .= " AND EXISTS (SELECT sc.fk_soc FROM ".$this->db->prefix()."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc AND sc.fk_user = ".((int) $search_sale).")";
 			}
 		}
 		if ($sqlfilters) {
diff --git a/htdocs/modulebuilder/template/class/myobject.class.php b/htdocs/modulebuilder/template/class/myobject.class.php
index f9251809d17bb..7c43d256d17c3 100644
--- a/htdocs/modulebuilder/template/class/myobject.class.php
+++ b/htdocs/modulebuilder/template/class/myobject.class.php
@@ -587,7 +587,7 @@ public function validate($user, $notrigger = 0)
 
 		if (!empty($num)) {
 			// Validate
-			$sql = "UPDATE ".MAIN_DB_PREFIX.$this->table_element;
+			$sql = "UPDATE ".$this->db->prefix().$this->table_element;
 			$sql .= " SET ";
 			if (!empty($this->fields['ref'])) {
 				$sql .= " ref = '".$this->db->escape($num)."',";
@@ -625,14 +625,14 @@ public function validate($user, $notrigger = 0)
 			// Rename directory if dir was a temporary ref
 			if (preg_match('/^[\(]?PROV/i', $this->ref)) {
 				// Now we rename also files into index
-				$sql = 'UPDATE '.MAIN_DB_PREFIX."ecm_files set filename = CONCAT('".$this->db->escape($this->newref)."', SUBSTR(filename, ".(strlen($this->ref) + 1).")), filepath = 'myobject/".$this->db->escape($this->newref)."'";
+				$sql = 'UPDATE '.$this->db->prefix()."ecm_files set filename = CONCAT('".$this->db->escape($this->newref)."', SUBSTR(filename, ".(strlen($this->ref) + 1).")), filepath = 'myobject/".$this->db->escape($this->newref)."'";
 				$sql .= " WHERE filename LIKE '".$this->db->escape($this->ref)."%' AND filepath = 'myobject/".$this->db->escape($this->ref)."' and entity = ".$conf->entity;
 				$resql = $this->db->query($sql);
 				if (!$resql) {
 					$error++;
 					$this->error = $this->db->lasterror();
 				}
-				$sql = 'UPDATE '.MAIN_DB_PREFIX."ecm_files set filepath = 'myobject/".$this->db->escape($this->newref)."'";
+				$sql = 'UPDATE '.$this->db->prefix()."ecm_files set filepath = 'myobject/".$this->db->escape($this->newref)."'";
 				$sql .= " WHERE filepath = 'myobject/".$this->db->escape($this->ref)."' and entity = ".$conf->entity;
 				$resql = $this->db->query($sql);
 				if (!$resql) {
@@ -1026,7 +1026,7 @@ public function info($id)
 		if (!empty($this->fields['fk_user_valid'])) {
 			$sql .= ", fk_user_valid";
 		}
-		$sql .= " FROM ".MAIN_DB_PREFIX.$this->table_element." as t";
+		$sql .= " FROM ".$this->db->prefix().$this->table_element." as t";
 		$sql .= " WHERE t.rowid = ".((int) $id);
 
 		$result = $this->db->query($sql);
diff --git a/htdocs/modulebuilder/template/core/modules/mailings/mailing_mymodule_selector1.modules.php b/htdocs/modulebuilder/template/core/modules/mailings/mailing_mymodule_selector1.modules.php
index a14f339306b72..b55fa3e6fe31a 100644
--- a/htdocs/modulebuilder/template/core/modules/mailings/mailing_mymodule_selector1.modules.php
+++ b/htdocs/modulebuilder/template/core/modules/mailings/mailing_mymodule_selector1.modules.php
@@ -111,7 +111,7 @@ public function add_to_target($mailing_id)
 		$j = 0;
 
 		$sql = "SELECT rowid as id, firstname, lastname, email";
-		$sql .= " FROM ".MAIN_DB_PREFIX."myobject";
+		$sql .= " FROM ".$this->db->prefix()."myobject";
 		$sql .= " WHERE email IS NOT NULL AND email <> ''";
 		if (GETPOSTISSET('filter') && GETPOST('filter', 'alphanohtml') != 'none') {
 			$sql .= " AND status = '".$this->db->escape(GETPOST('filter', 'alphanohtml'))."'";
@@ -195,7 +195,7 @@ public function getSqlArrayForStats()
 	public function getNbOfRecipients($sql = '')
 	{
 		$sql = "SELECT COUNT(DISTINCT(email)) as nb";
-		$sql .= " FROM ".MAIN_DB_PREFIX."myobject as p";
+		$sql .= " FROM ".$this->db->prefix()."myobject as p";
 		$sql .= " WHERE email IS NOT NULL AND email <> ''";
 
 		$a = parent::getNbOfRecipients($sql);
diff --git a/htdocs/modulebuilder/template/core/modules/modMyModule.class.php b/htdocs/modulebuilder/template/core/modules/modMyModule.class.php
index 9a0e08299724a..2a894544b8e07 100644
--- a/htdocs/modulebuilder/template/core/modules/modMyModule.class.php
+++ b/htdocs/modulebuilder/template/core/modules/modMyModule.class.php
@@ -228,7 +228,7 @@ public function __construct($db)
 		 // Label of tables
 		 'tablib' => array("Table1", "Table2", "Table3"),
 		 // Request to select fields
-		 'tabsql' => array('SELECT f.rowid as rowid, f.code, f.label, f.active FROM '.MAIN_DB_PREFIX.'table1 as f', 'SELECT f.rowid as rowid, f.code, f.label, f.active FROM '.MAIN_DB_PREFIX.'table2 as f', 'SELECT f.rowid as rowid, f.code, f.label, f.active FROM '.MAIN_DB_PREFIX.'table3 as f'),
+		 'tabsql' => array('SELECT f.rowid as rowid, f.code, f.label, f.active FROM '.$this->db->prefix().'table1 as f', 'SELECT f.rowid as rowid, f.code, f.label, f.active FROM '.$this->db->prefix().'table2 as f', 'SELECT f.rowid as rowid, f.code, f.label, f.active FROM '.$this->db->prefix().'table3 as f'),
 		 // Sort order
 		 'tabsqlsort' => array("label ASC", "label ASC", "label ASC"),
 		 // List of fields (result of select to show dictionary)
@@ -411,8 +411,8 @@ public function __construct($db)
 		//$this->export_examplevalues_array[$r] = array('t.field' => 'Example');
 		//$this->export_help_array[$r] = array('t.field' => 'FieldDescHelp');
 		$this->export_sql_start[$r]='SELECT DISTINCT ';
-		$this->export_sql_end[$r]  =' FROM '.MAIN_DB_PREFIX.'mymodule_myobject as t';
-		//$this->export_sql_end[$r]  .=' LEFT JOIN '.MAIN_DB_PREFIX.'mymodule_myobject_line as tl ON tl.fk_myobject = t.rowid';
+		$this->export_sql_end[$r]  =' FROM '.$this->db->prefix().'mymodule_myobject as t';
+		//$this->export_sql_end[$r]  .=' LEFT JOIN '.$this->db->prefix().'mymodule_myobject_line as tl ON tl.fk_myobject = t.rowid';
 		$this->export_sql_end[$r] .=' WHERE 1 = 1';
 		$this->export_sql_end[$r] .=' AND t.entity IN ('.getEntity('myobject').')';
 		$r++; */
@@ -426,7 +426,7 @@ public function __construct($db)
 		$this->import_code[$r] = $this->rights_class.'_'.$r;
 		$this->import_label[$r] = 'MyObjectLines';	// Translation key (used only if key ExportDataset_xxx_z not found)
 		$this->import_icon[$r] = $this->picto;
-		$this->import_tables_array[$r] = array('t' => MAIN_DB_PREFIX.'mymodule_myobject', 'extra' => MAIN_DB_PREFIX.'mymodule_myobject_extrafields');
+		$this->import_tables_array[$r] = array('t' => $this->db->prefix().'mymodule_myobject', 'extra' => $this->db->prefix().'mymodule_myobject_extrafields');
 		$this->import_tables_creator_array[$r] = array('t' => 'fk_user_author'); // Fields to store import user id
 		$import_sample = array();
 		$keyforclass = 'MyObject'; $keyforclassfile='/mymodule/class/myobject.class.php'; $keyforelement='myobject@mymodule';
@@ -434,7 +434,7 @@ public function __construct($db)
 		$import_extrafield_sample = array();
 		$keyforselect='myobject'; $keyforaliasextra='extra'; $keyforelement='myobject@mymodule';
 		include DOL_DOCUMENT_ROOT.'/core/extrafieldsinimport.inc.php';
-		$this->import_fieldshidden_array[$r] = array('extra.fk_object' => 'lastrowid-'.MAIN_DB_PREFIX.'mymodule_myobject');
+		$this->import_fieldshidden_array[$r] = array('extra.fk_object' => 'lastrowid-'.$this->db->prefix().'mymodule_myobject');
 		$this->import_regex_array[$r] = array();
 		$this->import_examplevalues_array[$r] = array_merge($import_sample, $import_extrafield_sample);
 		$this->import_updatekeys_array[$r] = array('t.ref' => 'Ref');
@@ -512,10 +512,10 @@ public function init($options = '')
 				}
 
 				$sql = array_merge($sql, array(
-					"DELETE FROM ".MAIN_DB_PREFIX."document_model WHERE nom = 'standard_".strtolower($myTmpObjectKey)."' AND type = '".$this->db->escape(strtolower($myTmpObjectKey))."' AND entity = ".((int) $conf->entity),
-					"INSERT INTO ".MAIN_DB_PREFIX."document_model (nom, type, entity) VALUES('standard_".strtolower($myTmpObjectKey)."', '".$this->db->escape(strtolower($myTmpObjectKey))."', ".((int) $conf->entity).")",
-					"DELETE FROM ".MAIN_DB_PREFIX."document_model WHERE nom = 'generic_".strtolower($myTmpObjectKey)."_odt' AND type = '".$this->db->escape(strtolower($myTmpObjectKey))."' AND entity = ".((int) $conf->entity),
-					"INSERT INTO ".MAIN_DB_PREFIX."document_model (nom, type, entity) VALUES('generic_".strtolower($myTmpObjectKey)."_odt', '".$this->db->escape(strtolower($myTmpObjectKey))."', ".((int) $conf->entity).")"
+					"DELETE FROM ".$this->db->prefix()."document_model WHERE nom = 'standard_".strtolower($myTmpObjectKey)."' AND type = '".$this->db->escape(strtolower($myTmpObjectKey))."' AND entity = ".((int) $conf->entity),
+					"INSERT INTO ".$this->db->prefix()."document_model (nom, type, entity) VALUES('standard_".strtolower($myTmpObjectKey)."', '".$this->db->escape(strtolower($myTmpObjectKey))."', ".((int) $conf->entity).")",
+					"DELETE FROM ".$this->db->prefix()."document_model WHERE nom = 'generic_".strtolower($myTmpObjectKey)."_odt' AND type = '".$this->db->escape(strtolower($myTmpObjectKey))."' AND entity = ".((int) $conf->entity),
+					"INSERT INTO ".$this->db->prefix()."document_model (nom, type, entity) VALUES('generic_".strtolower($myTmpObjectKey)."_odt', '".$this->db->escape(strtolower($myTmpObjectKey))."', ".((int) $conf->entity).")"
 				));
 			}
 		}
diff --git a/htdocs/modulebuilder/template/core/modules/mymodule/mod_myobject_standard.php b/htdocs/modulebuilder/template/core/modules/mymodule/mod_myobject_standard.php
index 4d2329d8a2f85..98d9b5fbffec7 100644
--- a/htdocs/modulebuilder/template/core/modules/mymodule/mod_myobject_standard.php
+++ b/htdocs/modulebuilder/template/core/modules/mymodule/mod_myobject_standard.php
@@ -93,7 +93,7 @@ public function canBeActivated($object)
 
 		$posindice = strlen($this->prefix) + 6;
 		$sql = "SELECT MAX(CAST(SUBSTRING(ref FROM ".$posindice.") AS SIGNED)) as max";
-		$sql .= " FROM ".MAIN_DB_PREFIX."mymodule_myobject";
+		$sql .= " FROM ".$db->prefix()."mymodule_myobject";
 		$sql .= " WHERE ref LIKE '".$db->escape($this->prefix)."____-%'";
 		if ($object->ismultientitymanaged == 1) {
 			$sql .= " AND entity = ".$conf->entity;
@@ -131,7 +131,7 @@ public function getNextValue($object)
 		// first we get the max value
 		$posindice = strlen($this->prefix) + 6;
 		$sql = "SELECT MAX(CAST(SUBSTRING(ref FROM ".$posindice.") AS SIGNED)) as max";
-		$sql .= " FROM ".MAIN_DB_PREFIX."mymodule_myobject";
+		$sql .= " FROM ".$db->prefix()."mymodule_myobject";
 		$sql .= " WHERE ref LIKE '".$db->escape($this->prefix)."____-%'";
 		if ($object->ismultientitymanaged == 1) {
 			$sql .= " AND entity = ".$conf->entity;
diff --git a/htdocs/modulebuilder/template/mymoduleindex.php b/htdocs/modulebuilder/template/mymoduleindex.php
index 8ac978ddfa6fb..892231a8f01dc 100644
--- a/htdocs/modulebuilder/template/mymoduleindex.php
+++ b/htdocs/modulebuilder/template/mymoduleindex.php
@@ -132,8 +132,8 @@
 
 	$sql = "SELECT c.rowid, c.ref, c.ref_client, c.total_ht, c.tva as total_tva, c.total_ttc, s.rowid as socid, s.nom as name, s.client, s.canvas";
 	$sql.= ", s.code_client";
-	$sql.= " FROM ".MAIN_DB_PREFIX."commande as c";
-	$sql.= ", ".MAIN_DB_PREFIX."societe as s";
+	$sql.= " FROM ".$db->prefix()."commande as c";
+	$sql.= ", ".$db->prefix()."societe as s";
 	$sql.= " WHERE c.fk_soc = s.rowid";
 	$sql.= " AND c.fk_statut = 0";
 	$sql.= " AND c.entity IN (".getEntity('commande').")";
@@ -204,7 +204,7 @@
 // Last modified myobject
 if (isModEnabled('mymodule') && $user->hasRight('mymodule', 'read')) {
 	$sql = "SELECT s.rowid, s.ref, s.label, s.date_creation, s.tms";
-	$sql.= " FROM ".MAIN_DB_PREFIX."mymodule_myobject as s";
+	$sql.= " FROM ".$db->prefix()."mymodule_myobject as s";
 	$sql.= " WHERE s.entity IN (".getEntity($myobjectstatic->element).")";
 	//if ($socid)	$sql.= " AND s.rowid = $socid";
 	$sql .= " ORDER BY s.tms DESC";
diff --git a/htdocs/modulebuilder/template/myobject_list.php b/htdocs/modulebuilder/template/myobject_list.php
index 864ad8adf9d04..85bf290801a42 100644
--- a/htdocs/modulebuilder/template/myobject_list.php
+++ b/htdocs/modulebuilder/template/myobject_list.php
@@ -317,10 +317,10 @@
 
 $sqlfields = $sql; // $sql fields to remove for count total
 
-$sql .= " FROM ".MAIN_DB_PREFIX.$object->table_element." as t";
-//$sql .= " LEFT JOIN ".MAIN_DB_PREFIX."anothertable as rc ON rc.parent = t.rowid";
+$sql .= " FROM ".$db->prefix().$object->table_element." as t";
+//$sql .= " LEFT JOIN ".$db->prefix()."anothertable as rc ON rc.parent = t.rowid";
 if (isset($extrafields->attributes[$object->table_element]['label']) && is_array($extrafields->attributes[$object->table_element]['label']) && count($extrafields->attributes[$object->table_element]['label'])) {
-	$sql .= " LEFT JOIN ".MAIN_DB_PREFIX.$object->table_element."_extrafields as ef on (t.rowid = ef.fk_object)";
+	$sql .= " LEFT JOIN ".$db->prefix().$object->table_element."_extrafields as ef on (t.rowid = ef.fk_object)";
 }
 // Add table from hooks
 $parameters = array();
@@ -378,9 +378,9 @@
 // Search on sale representative
 if ($search_sale && $search_sale != '-1') {
 	if ($search_sale == -2) {
-		$sql .= " AND NOT EXISTS (SELECT sc.fk_soc FROM ".MAIN_DB_PREFIX."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc)";
+		$sql .= " AND NOT EXISTS (SELECT sc.fk_soc FROM ".$db->prefix()."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc)";
 	} elseif ($search_sale > 0) {
-		$sql .= " AND EXISTS (SELECT sc.fk_soc FROM ".MAIN_DB_PREFIX."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc AND sc.fk_user = ".((int) $search_sale).")";
+		$sql .= " AND EXISTS (SELECT sc.fk_soc FROM ".$db->prefix()."societe_commerciaux as sc WHERE sc.fk_soc = t.fk_soc AND sc.fk_user = ".((int) $search_sale).")";
 	}
 }
 // Search on socid
diff --git a/htdocs/modulebuilder/template/scripts/mymodule.php b/htdocs/modulebuilder/template/scripts/mymodule.php
index 24978ec7f1560..8b19deb0a5e57 100644
--- a/htdocs/modulebuilder/template/scripts/mymodule.php
+++ b/htdocs/modulebuilder/template/scripts/mymodule.php
@@ -184,7 +184,7 @@
 // An example of a direct SQL read without using the fetch method
 /*
 $sql = "SELECT field1, field2";
-$sql.= " FROM ".MAIN_DB_PREFIX."myobject";
+$sql.= " FROM ".$db->prefix()."myobject";
 $sql.= " WHERE field3 = 'xxx'";
 $sql.= " ORDER BY field1 ASC";