模型的时间戳自动写入支持timestamp类型字段

library/think/db/connector/Pgsql.php

@@ -43,6 +43,7 @@ class Pgsql extends Connection
      */
     public function getFields($tableName)
     {
+        $this->initConnect(true);
         list($tableName) = explode(' ', $tableName);
         $sql             = 'select fields_name as "field",fields_type as "type",fields_not_null as "null",fields_key_name as "key",fields_default as "default",fields_default as "extra" from table_msg(' . $tableName . ');';
         $pdo             = $this->linkID->query($sql);