diff --git a/library/think/db/connector/Pgsql.php b/library/think/db/connector/Pgsql.php
index 06e08f54..6d653c14 100644
--- a/library/think/db/connector/Pgsql.php
+++ b/library/think/db/connector/Pgsql.php
@@ -77,6 +77,7 @@ class Pgsql extends Connection
      */
     public function getTables($dbName = '')
     {
+        $this->initConnect(true);
         $sql = "select tablename as Tables_in_test from pg_tables where  schemaname ='public'";
         // 调试开始
         $this->debug(true);
diff --git a/library/think/db/connector/Sqlite.php b/library/think/db/connector/Sqlite.php
index 1a52905e..95b023e5 100644
--- a/library/think/db/connector/Sqlite.php
+++ b/library/think/db/connector/Sqlite.php
@@ -74,6 +74,7 @@ class Sqlite extends Connection
      */
     public function getTables($dbName = '')
     {
+        $this->initConnect(true);
         $sql = "SELECT name FROM sqlite_master WHERE type='table' "
             . "UNION ALL SELECT name FROM sqlite_temp_master "
             . "WHERE type='table' ORDER BY name";
diff --git a/library/think/db/connector/Sqlsrv.php b/library/think/db/connector/Sqlsrv.php
index a8fc5414..18148051 100644
--- a/library/think/db/connector/Sqlsrv.php
+++ b/library/think/db/connector/Sqlsrv.php
@@ -99,6 +99,7 @@ class Sqlsrv extends Connection
      */
     public function getTables($dbName = '')
     {
+        $this->initConnect(true);
         $sql = "SELECT TABLE_NAME
             FROM INFORMATION_SCHEMA.TABLES
             WHERE TABLE_TYPE = 'BASE TABLE'