{"id":387,"title":"mongodb\u6587\u6863\u67e5\u8be2","good":0,"bad":0,"hit":2321,"created_at":"2018-08-02 00:24:59","content":"

mongodb\u6587\u6863\u67e5\u8be2\uff1a<\/p>

<\/p>

> db.centos_hr_study.find()<\/p>

{ "_id" : ObjectId("5b61d2bf2d2a29b484b2a8b8"), "name" : "\u8fd9\u662f\u4e00\u4e2a\u5728centos\u4e2d\u5efa\u7acb\u7684\u7528\u4e8e\u5b66\u4e60\u7684mongodb\u6570\u636e\u5e93" }<\/p>

{ "_id" : ObjectId("5b61d55d2d2a29b484b2a8ba"), "name" : "\u5f20\u4e09", "age" : "30", "height" : "130" }<\/p>

{ "_id" : ObjectId("5b61d5752d2a29b484b2a8bb"), "name" : "\u5f204", "age" : "40" }<\/p>

{ "_id" : ObjectId("5b61d7932d2a29b484b2a8be"), "name" : "\u8d755", "age" : "50", "height" : 150, "sex" : "\u4e0d\u7537\u4e0d\u5973" }<\/p>

{ "_id" : ObjectId("5b61d79d2d2a29b484b2a8bf"), "name" : "\u674e6", "age" : "60", "height" : 160, "sex" : "\u5973" }<\/p>

<\/p>

\u67e5\u627eage<=40\u7684\uff0c\u6ca1\u67e5\u5230\uff1a<\/p>

> db.centos_hr_study.find({"age":{$lte:40}})<\/p>

\u67e5\u627eage<="40"\u7684\uff0c\u6709\u67e5\u5230\uff1a<\/p>

> db.centos_hr_study.find({"age":{$lte:"40"}})<\/p>

{ "_id" : ObjectId("5b61d55d2d2a29b484b2a8ba"), "name" : "\u5f20\u4e09", "age" : "30", "height" : "130" }<\/p>

{ "_id" : ObjectId("5b61d5752d2a29b484b2a8bb"), "name" : "\u5f204", "age" : "40" }<\/p>

<\/p>

\u67e5\u627eage<="40" \u4e14 height>="120"\u7684\uff0c\u6709\u67e5\u5230\uff1a<\/p>

> db.centos_hr_study.find({"age":{$lte:"40"},"height":{$gte:"120"}})<\/p>

{ "_id" : ObjectId("5b61d55d2d2a29b484b2a8ba"), "name" : "\u5f20\u4e09", "age" : "30", "height" : "130" }<\/p>

> <\/p>

<\/p>"}