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" } }
             , new Document() { { "title", "测试11111" } });

UPDATE movies SET `title` = ‘测试1111’ WHERE `title` = '测试1111'

Linq查询

(from item in db.GetCollection("movies").Linq()
                       where ((string)item["title"]).StartsWith("Esr")
                       select item);

select * from movies where title like ‘%Esr’