feat: Add more validation.

Author: ping-yee

system/Database/SQLSRV/Builder.php

@@ -290,19 +290,19 @@ private function getFullName(string $table): string
         }
 
         if ($this->db->escapeChar === '"') {
-            if (str_contains($table, '.')) {
+            if (str_contains($table, '.') && !str_starts_with($table, '.') && !str_ends_with($table, '.')) {
                 $dbInfo   = explode('.', $table);
                 $database = $this->db->getDatabase();
-                $schema   = $this->db->schema;
                 $table    = $dbInfo[0];
 
                 if (isset($dbInfo[1], $dbInfo[2])) {
                     $database  = str_replace('"', '', $dbInfo[0]);
                     $schema    = str_replace('"', '', $dbInfo[1]);
                     $tableName = str_replace('"', '', $dbInfo[2]);
-                }
 
                 return '"' . $database . '"."' . $schema . '"."' . str_replace('"', '', $tableName) . '"' . $alias;
+                }
+
             }
 
             return '"' . $this->db->getDatabase() . '"."' . $this->db->schema . '"."' . str_replace('"', '', $table) . '"' . $alias;