此处用mysql中的sql语句做例子,C# 驱动用的是samus,也就是上文中介绍的第一种.
引入项目MongoDB.dll
//创建Mongo连接
var mongo = new Mongo("mongodb://localhost");
mongo.Connect();
//获取一个数据库,如果没有会自动创建一个
var db = mongo.GetDatabase("movieReviews");
//创建一个列表,并为这个列表创建文档
var movies = db.GetCollection("movies");
连接没问题之后,现在让我们用mysql 与mongodb的一些语句做下对比:
MongoDB | Mysql | |
查询全部 | movies.find(new Document()) | SELECT * FROM movies |
条件查询 | movies.Find(new Document { { "title", "Hello Esr" } }); | SELECT * FROM movies WHERE title= 'foobar' |
查询数量 | movies.Find(new Document { { "title", "测试2" } }).Documents.Count(); | SELECT COUNT(*) FROM movies WHERE `title` = 'foobar' |
数量范围查询 | 1, movies.Find(new Document().Add("$where", new Code("this.num > 50"))); 2, movies.Find(new Document().Add("num", new Document().Add("$gt",50))); ($gt : > ; $gte : >= ; $lt : < ; $lte : <= ; $ne : !=) 3,movies.Find("this.num > 50"); 4,movies.Find(new Document().Add("$where",new Code("function(x){ return this.num > 50};"))); |
select * from movies where num > 50 |
分页查询 | movies.Find(new Document()).Skip(10).Limit(20); | SELECT * FROM movies limit 10,20 |
查询排序语句 | movies.Find(new Document()).Sort(new Document() { { "num", -1 } }); | SELECT * FROM movies ORDER BY num DESC |
查询指定字段 | movies.Find(new Document().Add("num", new Document().Add("$gt", 50)), 10, 0, new Document() { { "title", 1 } }); | select title from movies where num > 50 |
插入语句 | movies.Insert(new Document() { { "title", "测试" }, { "resuleData", DateTime.Now } }); | INSERT INOT movies (`title`, `reauleDate`) values ('foobar',25) |
删除语句 | movies.Remove(new Document() { { "title", "Hello Esr" } }); | DELETE * FROM movies |
更新语句 |
movies.Update(new Document() { { "title", "测试2" } } |
UPDATE movies SET `title` = ‘测试1111’ WHERE `title` = '测试1111' |
Linq查询 |
(from item in db.GetCollection("movies").Linq() |
select * from movies where title like ‘%Esr’ |
这里只举出了几个比较典型的例子,可以这么说,只要mysql可以完成的sql语句,在mongodb里面都可以实现.