在珠海或任何其他地方，要实现高效的数据库操作，你可以遵循以下最佳实践：

1. **使用PDO (PHP Data Objects) 或MySQLi**：
这两个都是PHP中推荐的数据库访问扩展。它们支持 prepared statements，可以防止SQL注入攻击，并提供更好的性能和错误处理。

2. **使用预处理语句**：
预处理语句可以提高代码的可读性和安全性，同时减少数据库负载。通过使用占位符来传递参数，可以避免直接将用户输入嵌入到SQL语句中。

3. **优化SQL语句**：
- 使用索引：确保经常查询的字段都有索引。
- 分析和使用执行计划：使用`EXPLAIN`来分析SQL语句的执行效率。
- 避免使用`SELECT *`: 只查询你需要的字段。
- 使用`JOIN`而不是子查询：在适当的情况下，`JOIN`通常比子查询更高效。
- 避免`OR`操作：`OR`操作通常会导致全表扫描。

4. **使用事务**：
对于需要保持一致性的数据操作，使用事务可以确保要么所有操作都成功，要么都不成功。

5. **缓存**：
使用缓存策略，如内存缓存（如Redis或Memcached）或文件缓存，来减少对数据库的访问。

6. **分页**：
当处理大量数据时，使用分页来限制每次查询返回的数据量。

7. **避免频繁的查询**：
将经常查询的数据保存在PHP的会话变量或应用程序的缓存中，以减少对数据库的访问。

8. **使用数据库特有的功能**：
利用数据库的特性，如MySQL的``````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````````