擅长:python、mysql、java
<p>Django 1.4及以上版本有<a href="https://docs.djangoproject.com/en/2.0/ref/models/querysets/#prefetch-related" rel="noreferrer">^{<cd1>}</a>用于此目的。</p>
<p><a href="https://docs.djangoproject.com/en/2.0/ref/models/querysets/#prefetch-related" rel="noreferrer">^{<cd1>}</a>方法与<a href="https://docs.djangoproject.com/en/2.0/ref/models/querysets/#select-related" rel="noreferrer">^{<cd3>}</a>类似,但不执行数据库联接。相反,它执行额外的数据库查询并在Python中进行连接。</p>