我正在构建一个Java微服务，它使用AWS Aurora Mysql进行一些操作。代码连接到数据库罚款和前3个查询我有抛出类似的错误，直到我意识到我是失踪的分号。然而，最后一个查询（update语句）仍然给我同样的语法错误，即使使用了分号，我也不知道为什么。
下面是代码

try {
            conn = DriverManager.getConnection(jdbcUrl);

            setupStatement = conn.createStatement();
            idInsertStatement = conn.createStatement();
            secretNumberUpdateStatement = conn.createStatement();

            String createTableIfNotExists = "CREATE TABLE IF NOT EXISTS secret_number_generator(id BIGINT NOT NULL AUTO_INCREMENT PRIMARY KEY, secret_number VARCHAR(20);";

            String generateSecretId = "INSERT INTO secret_number_generator VALUES(null,null);";
            
            String getLastRecordId = "SELECT id FROM secret_number_generator ORDER BY id DESC LIMIT 1;";
            
            setupStatement.addBatch(createTableIfNotExists);
            idInsertStatement.addBatch(generateSecretId);
            setupStatement.executeBatch();
            idInsertStatement.executeBatch();
            readStatement = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_READ_ONLY);
            resultSet = readStatement.executeQuery(getLastRecordId);
         
            while(resultSet.next()){
                id = String.valueOf(resultSet.getLong("id"));
            }

            /*
              Logic for setting up secretNumber
            */

            }
            secretNumber = "R" + env + id + randomDigit;
            
            String updateSecretNumber = "UPDATE secret_number_generator SET secret_number = " + secretNumber + " WHERE id = " + id + ";";
            
            secretNumberUpdateStatement.addBatch(updateSecretNumber);
            secretNumberUpdateStatement.executeBatch();

            resultSet.close();
            setupStatement.close();
            idInsertStatement.close();
            secretNumberUpdateStatement.close();
            readStatement.close();
            conn.close();

        } catch (SQLException ex) {
            // Handle any errors
            System.out.println("SQLException: " + ex.getMessage());
            System.out.println("SQLState: " + ex.getSQLState());
            System.out.println("VendorError: " + ex.getErrorCode());
        } finally {
            System.out.println("Closing the connection.");
            if (conn != null) try { conn.close(); } catch (SQLException ignore) {}
        }

我得到的更新查询的错误是

SQLException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

如前所述，在我在前面的查询末尾添加分号之前，前面的查询显示了相同的错误，现在只显示最后一个查询。