업데이트 '3. 데이터베이스 조회'

3.-%EB%8D%B0%EC%9D%B4%ED%84%B0%EB%B2%A0%EC%9D%B4%EC%8A%A4-%EC%A1%B0%ED%9A%8C.md

@@ -24,10 +24,16 @@
 ## BusinessRequest
 ```
 public class UserQuery extends QueryRequest {
-    private String userIDs;
-    ...
-}```
-
+    private String[] userIDs;
+    
+    public String[] getUserIDs() {
+        return ifEmpty(userIDs, () -> null);
+    }
+    
+    public void setUserIDs(String... userIDs) {...}
+}
+```
+QueryRequest는 
 
 ## business-mapper.xml