Postgresql 中文操作指南

Chapter 35. Large Objects

Table of Contents

PostgreSQL 提供了 large object 机制，该机制提供流式方式访问存储在特殊大对象结构中的用户数据。在处理过大而无法方便地整体操作的数据值时，流式访问非常有用。

PostgreSQL has a large object facility, which provides stream-style access to user data that is stored in a special large-object structure. Streaming access is useful when working with data values that are too large to manipulate conveniently as a whole.

本章介绍了 PostgreSQL 大对象数据的实现以及编程和查询语言接口。我们使用 libpq C 库作为本章示例，但大多数专为 PostgreSQL 开发的编程接口都支持同等功能。其他接口可能在内部使用大对象接口来为大值提供通用支持。这里未予描述。

This chapter describes the implementation and the programming and query language interfaces to PostgreSQL large object data. We use the libpq C library for the examples in this chapter, but most programming interfaces native to PostgreSQL support equivalent functionality. Other interfaces might use the large object interface internally to provide generic support for large values. This is not described here.