Document how to confirm that `INSERT` worked with prepared statement

When using execute() I can parse the command output for INSERT to confirm a single row inserted like INSERT 0 1. However, execute() does not support the LRU for automatically prepared statements. Can you document how to confirm that the INSERT worked using a fetch*() method that will use the LRU? I do sometimes see INSERT 0 0 results in some high-volume workloads (likely just duplicate data), and these do not raise UniqueViolationError, QueryCanceledError, or some TimeoutError.

首先，结合 PostgreSQL 的 INSERT 命令文档，查看 asyncpg 已记录的 execute() 和 fetch*() 方法。确定在使用 prepared-statement LRU 时，如何通过基于 fetch 的调用确认 INSERT 是否影响了一行，包括影响行数为零的含义。文档清楚说明推荐的方法和预期结果后，即表示完成。