Rewardの存在をチェックするメソッド追加

Author: miyabi033

src/main/java/dev/felnull/pointed/teams/manager/reward/RewardAdminService.java

@@ -24,6 +24,7 @@ public interface RewardAdminService {
     void moveCommand(int rewardId, int fromIdx, int toIdx) throws SQLException;
     void setCommandEnabled(int rewardId, int idx, boolean enabled) throws SQLException;
     void updateCommandText(int rewardId, int idx, String newText) throws SQLException;
+    boolean rewardExists(long rewardId);
 
     // ===== Reward =====
     /**

src/main/java/dev/felnull/pointed/teams/manager/reward/impl/RewardAdminServiceImpl.java

@@ -752,5 +752,35 @@ public void dispatchManual(UUID playerUuid, String playerName, int rewardId) thr
         }
     }
 
+    // ==== 存在確認（非トランザクション版）====
+    public boolean rewardExists(long rewardId) {
+        try (Connection con = ds.getConnection()) {
+            return rewardExists(con, rewardId);
+        } catch (SQLException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    // ==== 存在確認（トランザクション版・接続使い回し）====
+    public boolean rewardExists(Connection con, long rewardId) throws SQLException {
+        final String sql = "SELECT 1 FROM rewards WHERE id = ? LIMIT 1";
+        try (PreparedStatement ps = con.prepareStatement(sql)) {
+            ps.setLong(1, rewardId);
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next(); // 1行でも返れば存在
+            }
+        }
+    }
+
+    // もし名前で唯一ならこっちも（任意）
+    public boolean rewardExistsByName(Connection con, String name) throws SQLException {
+        final String sql = "SELECT 1 FROM rewards WHERE name = ? LIMIT 1";
+        try (PreparedStatement ps = con.prepareStatement(sql)) {
+            ps.setString(1, name);
+            try (ResultSet rs = ps.executeQuery()) {
+                return rs.next();
+            }
+        }
+    }
 
 }