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标题: mongdb怎么实现同时find和count [打印本页]

作者: 测试积点老人    时间: 2020-2-10 13:18
标题: mongdb怎么实现同时find和count
mongdb怎么实现同时find和count
假设有文档:
  1. [
  2. { name: 'a', content: 'xxx', list: [ 'A', 'A', 'C' ] },
  3. { name: 'b', content: 'yyy' ,list: [ 'A', 'B' ] },
  4. { name: 'c', content: 'zzz', list: [ 'B' ] }
  5. ]
复制代码


期望统计 list 中元素个数,并保持其他信息字段不变:
  1. [
  2. { name: 'a', content: 'xxx', list: 3 },
  3. { name: 'b', content: 'yyy' ,list: 2 },
  4. { name: 'c', content: 'zzz', list: 1 }
  5. ]
复制代码


请问在 mongodb 要怎么写查询语句?

作者: jingzizx    时间: 2020-2-11 10:49
按照语法测试编写




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