【MongoDB学习笔记15】MongoDB的查询：find查询条件-创新互联
find除了精确查询外，可以匹配更多的条件；
一、比较操作符
$lt代表<;
$lte代表<=;
$gt代表>;
$gte代表>=;
> db.post.find() { "_id" : ObjectId("54a530c3ff0df3732bac1681"), "id" : 2, "name" : "joe", "age" : 30, "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a530c3ff0df3732bac1680"), "id" : 1, "name" : "joe", "age" : 30, "comments" : [ "test2", "test9", "test5" ], "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a9700e1b5afd45354fd086"), "id" : 3, "test3" : 3 } { "_id" : ObjectId("54a9701c1b5afd45354fd087"), "id" : 4, "test4" : 4 } { "_id" : ObjectId("54a970281b5afd45354fd088"), "id" : 5, "test5" : 5 } { "_id" : ObjectId("54a970351b5afd45354fd089"), "id" : 6, "test6" : 6 } { "_id" : ObjectId("54a970781b5afd45354fd08a"), "id" : 7, "test7" : 7 } { "_id" : ObjectId("54a970831b5afd45354fd08b"), "id" : 8, "test8" : 8 } { "_id" : ObjectId("54a970901b5afd45354fd08c"), "id" : 9, "test9" : 9 } { "_id" : ObjectId("54a9709c1b5afd45354fd08d"), "id" : 10, "test10" : 10 } > db.post.find({"id":{"$gte":5,"$lte":7}}) { "_id" : ObjectId("54a970281b5afd45354fd088"), "id" : 5, "test5" : 5 } { "_id" : ObjectId("54a970351b5afd45354fd089"), "id" : 6, "test6" : 6 } { "_id" : ObjectId("54a970781b5afd45354fd08a"), "id" : 7, "test7" : 7 } >$ne代表不等于:
> db.post.find({"id":{"$ne":8}}) { "_id" : ObjectId("54a530c3ff0df3732bac1681"), "id" : 2, "name" : "joe", "age" : 30, "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a530c3ff0df3732bac1680"), "id" : 1, "name" : "joe", "age" : 30, "comments" : [ "test2", "test9", "test5" ], "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a9700e1b5afd45354fd086"), "id" : 3, "test3" : 3 } { "_id" : ObjectId("54a9701c1b5afd45354fd087"), "id" : 4, "test4" : 4 } { "_id" : ObjectId("54a970281b5afd45354fd088"), "id" : 5, "test5" : 5 } { "_id" : ObjectId("54a970351b5afd45354fd089"), "id" : 6, "test6" : 6 } { "_id" : ObjectId("54a970781b5afd45354fd08a"), "id" : 7, "test7" : 7 } { "_id" : ObjectId("54a970901b5afd45354fd08c"), "id" : 9, "test9" : 9 } { "_id" : ObjectId("54a9709c1b5afd45354fd08d"), "id" : 10, "test10" : 10 } >$in可以查询多个键值:
> db.post.find({"id":{"$in":[4,2,8]}}) { "_id" : ObjectId("54a530c3ff0df3732bac1681"), "id" : 2, "name" : "joe", "age" : 30, "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a9701c1b5afd45354fd087"), "id" : 4, "test4" : 4 } { "_id" : ObjectId("54a970831b5afd45354fd08b"), "id" : 8, "test8" : 8 } >
$nin用法：
> db.post.find({"id":{"$nin":[4,2,8]}}) { "_id" : ObjectId("54a530c3ff0df3732bac1680"), "id" : 1, "name" : "joe", "age" : 30, "comments" : [ "test2", "test9", "test5" ], "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a9700e1b5afd45354fd086"), "id" : 3, "test3" : 3 } { "_id" : ObjectId("54a970281b5afd45354fd088"), "id" : 5, "test5" : 5 } { "_id" : ObjectId("54a970351b5afd45354fd089"), "id" : 6, "test6" : 6 } { "_id" : ObjectId("54a970781b5afd45354fd08a"), "id" : 7, "test7" : 7 } { "_id" : ObjectId("54a970901b5afd45354fd08c"), "id" : 9, "test9" : 9 } { "_id" : ObjectId("54a9709c1b5afd45354fd08d"), "id" : 10, "test10" : 10 } >$or的用法：
> db.post.find({"$or":[{"sex":1},{"id":5}]}) { "_id" : ObjectId("54a530c3ff0df3732bac1681"), "id" : 2, "name" : "joe", "age" : 30, "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a530c3ff0df3732bac1680"), "id" : 1, "name" : "joe", "age" : 30, "comments" : [ "test2", "test9", "test5" ], "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a970281b5afd45354fd088"), "id" : 5, "test5" : 5 } >$mod会将查询的值除以第一个给定的值，若余数匹配第二个值，则匹配成功；
> db.post.find() { "_id" : ObjectId("54a530c3ff0df3732bac1681"), "id" : 2, "name" : "joe", "age" : 30, "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a530c3ff0df3732bac1680"), "id" : 1, "name" : "joe", "age" : 30, "comments" : [ "test2", "test9", "test5" ], "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a9700e1b5afd45354fd086"), "id" : 3, "test3" : 3 } { "_id" : ObjectId("54a9701c1b5afd45354fd087"), "id" : 4, "test4" : 4 } { "_id" : ObjectId("54a970281b5afd45354fd088"), "id" : 5, "test5" : 5 } { "_id" : ObjectId("54a970351b5afd45354fd089"), "id" : 6, "test6" : 6 } { "_id" : ObjectId("54a970781b5afd45354fd08a"), "id" : 7, "test7" : 7 } { "_id" : ObjectId("54a970831b5afd45354fd08b"), "id" : 8, "test8" : 8 } { "_id" : ObjectId("54a970901b5afd45354fd08c"), "id" : 9, "test9" : 9 } { "_id" : ObjectId("54a9709c1b5afd45354fd08d"), "id" : 10, "test10" : 10 } { "_id" : ObjectId("54aa8a90652d8bdfa0566d34"), "id" : 11, "test10" : 11 } > db.post.find({"id":{$mod:[5,1]}}) { "_id" : ObjectId("54a530c3ff0df3732bac1680"), "id" : 1, "name" : "joe", "age" : 30, "comments" : [ "test2", "test9", "test5" ], "sex" : 1, "school" : "marry" } { "_id" : ObjectId("54a970351b5afd45354fd089"), "id" : 6, "test6" : 6 } { "_id" : ObjectId("54aa8a90652d8bdfa0566d34"), "id" : 11, "test10" : 11 } >另外有需要云服务器可以了解下创新互联cdcxhl.cn，海内外云服务器15元起步，三天无理由+7*72小时售后在线，公司持有idc许可证，提供“云服务器、裸金属服务器、高防服务器、香港服务器、美国服务器、虚拟主机、免备案服务器”等云主机租用服务以及企业上云的综合解决方案，具有“安全稳定、简单易用、服务可用性高、性价比高”等特点与优势，专为企业上云打造定制，能够满足用户丰富、多元化的应用场景需求。
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