mongodb更新操作update

mongodb复杂更新操作update group by

mongodb复杂的更新操作：把一张表如果group by某个字段的数量大于5的数据对应的另外一张表进行更新。类似以下的sql语句功能：update from 表1 set 表1.字段1='yes' where 表1.code in(select 表2.code from 表2 group by 表2.code having ...

【MongoDB学习笔记13】MongoDB的更新（update）操作进阶

multi)criteria:update的查询条件，类似sql update查询内where后面的 objNew:update的对象和一些更新的操作符（如$,$inc.）等，也可以理解为sql update查询内set后面的 upsert:这个参数的意思是，无论false还是true，没有匹配的键则新增加...

【MongoDB学习笔记9】深入MongoDB的更新（update）操作:修改器$inc

ongoDB中文档存入数据库后用update方法更新文档，update方法有两个参数，例如 update（args1,args2）args1是指查询文档的条件；args2是指对查询到的文档进行什么样的修改；inc用来增加已用的键值，如果键不存在就创建；Inc只能修改的键值...

【MongoDB学习笔记8】深入MongoDB的更新（update）操作:修改器$set

MongoDB中文档存入数据库后用update方法更新文档，update方法有两个参数，例如 update（args1,args2）args1是指查询文档的条件；args2是指对查询到的文档进行什么样的修改；一、文档替换 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16>joe1=db....

【MongoDB学习笔记12】深入MongoDB的更新（update）操作:数组修改

查看一个文档的一个键值comments为一个数组[“test1”,”test2”]：1 2 3 4 5 6 7 8 9 10 11 12>db.post.findOne({"id":1}){"_id":ObjectId("54a530c3ff0df3732bac1680"),"id":1,"name":"joe","age":21,"comments":["test1","test2"]}>一、...

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