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煮酒品茶：大量序语和实例引用自书中，品茶对其实验后做的笔记上载至博客，任何有版权的人都可以直接下架下文章，谢谢合作。
| {"cwtea" : "hello","key":"vlaue"} |
| 1、文档中的键/值对应是有序的 {"cwtea" : "hello","key":"vlaue"}和{"key":"vlaue"，"cwtea" : "hello"}完全不同 2、文档中的值可以是多种数据类型，整字，字符串，甚至文档。键可以使用任意UTF-8字符。 3、键不能含有\0（空字符），这个字符用来表示键的结尾。 4、.和$有特别的意义，只有在特定环境下才能使用。 5、以下划线"_"开头的键是保留的，虽然这个并不是严格要求的。 6、mongoDB区分类型和区分大小写 ｛"foo" : 3｝ 不同于{"foo" : "3"} 整数和字符串 { "foo" : "3"}不同于{"Foo" : "3"} 大小写 7、mongoDB不能有重复的键 |
| > math.sin(math.pi /2) Mon Aug 13 23:28:19 ReferenceError: math is not defined (shell):1 > Math.sin(Math.PI /2) 1 > new Date("2010/1/1") ISODate("2009-12-31T16:00:00Z") > new Date("2010/1/1"); ISODate("2009-12-31T16:00:00Z") > "hello ,world!".replace("world", "mongodb") hello ,mongodb! > "hello ,world!".replace("world1", "mongodb") hello ,world! > "hello ,2".replace("2", "mongodb") hello ,mongodb > function factorial (n) { ... if (n <=1) return 1; ... return n * factorial(n-1) ... } > factorial(5); 120 |
| > use blog switched to db blog > post = {"title" : "my blog post", ... "content" : "here is my blog post.", ... "date" : new Date()} { "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z") } > db.blog.insert(post) > db.blog.find() { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z") } |
| > db.blog.findOne() { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z") } > db.blog.find({},{"title": 1} ) { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post" } { "_id" : ObjectId("50292b1a70fc23d6b7514588"), "title" : "two" } |
| > post { "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z") } > post.comments =[] [ ] > post { "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z"), "comments" : [ ] } > post.test="hello" hello > post { "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z"), "comments" : [ ], "test" : "hello" } #替换标题为my blog post的文章，第一个为条件，第二个为更新内容。 > db.blog.update({title : "my blog post"}, post) > db.blog.find() { "_id" : ObjectId("50292b1a70fc23d6b7514588"), "title" : "two", "content" : ISODate("2012-08-13T16:28:10.372Z") } { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z"), "comments" : [ ], "test" : "hello" } > db.blog.update({title : "two"}, {"title" : "baidu","content" : "www.cwtea.com" }) > db.blog.find() { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z"), "comments" : [ ], "test" : "hello" } { "_id" : ObjectId("50292b1a70fc23d6b7514588"), "title" : "baidu", "content" : "www.cwtea.com" } |
| > db.blog.remove({"title" : "baidu"}) > db.blog.find() { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z"), "comments" : [ ], "test" : "hello" } |
| > lq = { "name" : "cwtea", ... "address" : { ... "a" : "1", ... "b" : "2", ... "c" : "3", ... } ... ,"hello" :"cwtea"} { "name" : "cwtea", "address" : { "a" : "1", "b" : "2", "c" : "3" }, "hello" : "cwtea" } > db.blog.insert(lq) > db.blog.find() { "_id" : ObjectId("50292a7870fc23d6b7514586"), "title" : "my blog post", "content" : "here is my blog post.", "date" : ISODate("2012-08-13T16:24:51.467Z"), "comments" : [ ], "test" : "hello" } { "_id" : ObjectId("5029363070fc23d6b7514589"), "name" : "cwtea", "address" : { "a" : "1", "b" : "2", "c" : "3" }, "hello" : "cwtea" } > |
| 0-3[时间戳]4-6[机器]7-8[pid]9-11[计数器] |
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