diff --git a/extdbms/lib/Database/QueryBuilder.php b/extdbms/lib/Database/QueryBuilder.php
index 81b6b9b..10276f8 100644
--- a/extdbms/lib/Database/QueryBuilder.php
+++ b/extdbms/lib/Database/QueryBuilder.php
@@ -22,15 +22,15 @@ class QueryBuilder
   {
     $this->pdo = $pdo;
   }
-  final public function setDebug(bool $debug): void
+  final final public function setDebug(bool $debug): void
   {
     $this->_debug = $debug;
   }
-  final public function getLastQuery(): string
+  final final public function getLastQuery(): string
   {
     return $this->latestQuery;
   }
-  public function table(string $table): static
+  final public function table(string $table): static
   {
     $this->table = $table;
     return $this;
@@ -68,14 +68,14 @@ class QueryBuilder
   }
 
   //Select부분분
-  public function select(array|string $columns): static
+  final public function select(array|string $columns): static
   {
     $this->select = is_array($columns) ? $columns : explode(',', $columns);
     return $this;
   }
 
   //Where절부분
-  public function where(array|string $column, mixed $operator = null, mixed $value = null): static
+  final public function where(array|string $column, mixed $operator = null, mixed $value = null): static
   {
     if (is_array($column)) {
       foreach ($column as $col => $val) {
@@ -98,12 +98,12 @@ class QueryBuilder
     $this->bindings[$placeholder] = $value;
     return $this;
   }
-  public function orWhere(string $column, mixed $operator = null, mixed $value = null): static
+  final public function orWhere(string $column, mixed $operator = null, mixed $value = null): static
   {
     return $this->where($column, $operator, $value, "OR");
   }
 
-  public function whereIn(string $column, array $values, string $boolean = 'AND', $conditon_boolean = "IN"): static
+  final public function whereIn(string $column, array $values, string $boolean = 'AND', $conditon_boolean = "IN"): static
   {
     if (empty($values)) {
       throw new \InvalidArgumentException(__FUNCTION__ . ": values 배열이 비어있을 수 없습니다.");
@@ -118,14 +118,14 @@ class QueryBuilder
     $this->where[] = ['condition' => $condition, 'boolean' => $boolean];
     return $this;
   }
-  public function whereNotIn(string $column, array $values, $boolean = "AND", $conditon_boolean = "NOT IN"): static
+  final public function whereNotIn(string $column, array $values, $boolean = "AND", $conditon_boolean = "NOT IN"): static
   {
     if (empty($values)) {
       throw new \InvalidArgumentException(__FUNCTION__ . ": values 배열이 비어있을 수 없습니다.");
     }
     return $this->whereIn($column, $values, $boolean, $conditon_boolean);
   }
-  public function orWhereIn(string $column, array $values, $boolean = "OR", $conditon_boolean = "IN"): static
+  final public function orWhereIn(string $column, array $values, $boolean = "OR", $conditon_boolean = "IN"): static
   {
     if (empty($values)) {
       throw new \InvalidArgumentException(__FUNCTION__ . ": values 배열이 비어있을 수 없습니다.");
@@ -134,14 +134,14 @@ class QueryBuilder
   }
 
   //Join
-  public function join(string $table, string $on, string $type = 'INNER'): static
+  final public function join(string $table, string $on, string $type = 'INNER'): static
   {
     $this->joins[] = strtoupper($type) . " JOIN $table ON $on";
     return $this;
   }
 
   //Order
-  public function orderBy(mixed $column, string $direction = 'ASC'): static
+  final public function orderBy(mixed $column, string $direction = 'ASC'): static
   {
     if (is_array($column)) {
       // 배열 형식의 여러 컬럼 정렬을 처리
@@ -156,19 +156,19 @@ class QueryBuilder
     return $this;
   }
   //Limit부분
-  public function limit(int $limit): static
+  final public function limit(int $limit): static
   {
     $this->limit = $limit;
     return $this;
   }
-  public function offset(int $offset): static
+  final public function offset(int $offset): static
   {
     $this->offset = $offset;
     return $this;
   }
 
   //Customer SQL 실행부분
-  public function raw(string $sql, array $bindings = []): array
+  final public function raw(string $sql, array $bindings = []): array
   {
     $stmt = $this->pdo->prepare($sql);
     foreach ($bindings as $key => $value) {
@@ -180,7 +180,7 @@ class QueryBuilder
 
   //Result부분
   //binding까지 완료한 SQL문을 return함
-  public function toRawSql(): string
+  final public function toRawSql(): string
   {
     $sql = $this->buildSelectSql();
     $raw = $sql;
@@ -196,7 +196,7 @@ class QueryBuilder
     }
     return $raw;
   }
-  public function get(): array
+  final public function get(): array
   {
     $sql = $this->buildSelectSql();
     if ($this->_debug) {
@@ -213,14 +213,14 @@ class QueryBuilder
     return $stmt->fetchAll(PDO::FETCH_ASSOC);
   }
 
-  public function first(): ?array
+  final public function first(): ?array
   {
     $this->limit = 1;
     $results = $this->get();
     return $results[0] ?? null;
   }
 
-  public function count(string $select = "'COUNT(*) as cnt'"): int
+  final public function count(string $select = "COUNT(*) as cnt"): int
   {
     $this->select = [$select];
     $results = $this->get();
@@ -228,7 +228,7 @@ class QueryBuilder
   }
 
   //CUD부분
-  public function insert(array $data): bool
+  final public function insert(array $data): bool
   {
     $columns = array_keys($data);
     $placeholders = array_map(fn($c) => ':' . $c, $columns);
@@ -240,7 +240,7 @@ class QueryBuilder
     return $stmt->execute();
   }
 
-  public function update(array $data): bool
+  final public function update(array $data): bool
   {
     if (empty($this->where)) throw new \Exception("Update without WHERE is not allowed.");
 
@@ -259,7 +259,7 @@ class QueryBuilder
     return $stmt->execute();
   }
 
-  public function delete(): bool
+  final public function delete(): bool
   {
     if (empty($this->where)) throw new \Exception("Delete without WHERE is not allowed.");
     $sql = "DELETE FROM {$this->table} WHERE " . implode(' AND ', $this->where);
@@ -271,17 +271,17 @@ class QueryBuilder
   }
 
   //transaction관련련
-  public function beginTransaction(): void
+  final public function beginTransaction(): void
   {
     $this->pdo->beginTransaction();
   }
 
-  public function commit(): void
+  final public function commit(): void
   {
     $this->pdo->commit();
   }
 
-  public function rollBack(): void
+  final public function rollBack(): void
   {
     if ($this->pdo->inTransaction()) {
       $this->pdo->rollBack();
diff --git a/extdbms/lib/Services/CommonService.php b/extdbms/lib/Services/CommonService.php
index b9669a1..ba40fdc 100644
--- a/extdbms/lib/Services/CommonService.php
+++ b/extdbms/lib/Services/CommonService.php
@@ -42,7 +42,7 @@ abstract class CommonService extends Core
         }
         return $entitys;
     } // 
-    final public function getCount(string $select = "'COUNT(*) as cnt'"): int
+    final public function getCount(string $select = "COUNT(*) as cnt"): int
     {
         $count =  $this->getModel()->count($select);
         // echo "<BR>" . $this->getModel()->getLastQuery();