diff --git a/src/main/java/service/Service.kt b/src/main/java/service/Service.kt
index b45ff4b..e057293 100644
--- a/src/main/java/service/Service.kt
+++ b/src/main/java/service/Service.kt
@@ -23,7 +23,7 @@ class Service {
         val conn = DBUtil.getConnection()
         try {
             conn.createStatement()
-                    .executeUpdate(userToInsertSQL(user))
+                    .execute(userToInsertSQL(user))
 
             return true
         } catch (e: Exception) {
@@ -40,8 +40,11 @@ class Service {
     fun deleteUser(userId: Int): Boolean {
         val conn = DBUtil.getConnection()
         try {
-            return conn.createStatement()
-                    .executeUpdate("delete from `user` where id=$userId") > 1
+            conn.createStatement()
+                    .execute("delete from `user` where id=$userId")
+            return true
+        } catch (e: Exception) {
+            return false
         } finally {
             conn.close()
         }
@@ -92,8 +95,11 @@ class Service {
     fun deleteGroup(groupId: Int): Boolean {
         val conn = DBUtil.getConnection()
         try {
-            return conn.createStatement()
-                    .executeUpdate("delete from `group` where id=$groupId") > 1
+            conn.createStatement()
+                    .execute("delete from `group` where id=$groupId")
+            return true
+        } catch (e: Exception) {
+            return false
         } finally {
             conn.close()
         }
@@ -191,8 +197,12 @@ class Service {
     fun deleteRole(roleId: Int): Boolean {
         val conn = DBUtil.getConnection()
         try {
-            return conn.createStatement()
-                    .executeUpdate("delete from `role` where id=$roleId") > 1
+            conn.createStatement()
+                    .execute("delete from `role` where id=$roleId")
+            return true
+
+        } catch (e: Exception) {
+            return false
         } finally {
             conn.close()
         }
@@ -272,7 +282,7 @@ class Service {
         val conn = DBUtil.getConnection()
         try {
             conn.createStatement()
-                    .executeUpdate(permToInsertSQL(perm))
+                    .execute(permToInsertSQL(perm))
             return true
         } catch (e: Exception) {
             return false
@@ -289,7 +299,7 @@ class Service {
         val conn = DBUtil.getConnection()
         try {
             return conn.createStatement()
-                    .executeUpdate("delete from `perm` where id=$permId") > 1
+                    .execute("delete from `perm` where id=$permId") > 1
         } finally {
             conn.close()
         }
@@ -314,8 +324,11 @@ class Service {
     fun unbindPermToRole(permId: Int, roleId: Int): Boolean {
         val conn = DBUtil.getConnection()
         try {
-            return conn.createStatement()
-                    .executeUpdate("delete from mapping_perm_role where permId=$permId and roleId=$roleId)") > 1
+            conn.createStatement()
+                    .execute("delete from mapping_perm_role where permId=$permId and roleId=$roleId)")
+            return true
+        } catch (e: Exception) {
+            return false
         } finally {
             conn.close()
         }
@@ -362,8 +375,11 @@ class Service {
     fun deleteMenu(menuId: Int): Boolean {
         val conn = DBUtil.getConnection()
         try {
-            return conn.createStatement()
-                    .executeUpdate("delete from `menu` where id=$menuId") > 1
+            conn.createStatement()
+                    .execute("delete from `menu` where id=$menuId")
+            return true
+        } catch (e: Exception) {
+            return false
         } finally {
             conn.close()
         }