Coder Social home page Coder Social logo

not in怎么用这个orm实现 about chloe HOT 4 CLOSED

xcl-net avatar xcl-net commented on July 19, 2024
not in怎么用这个orm实现

from chloe.

Comments (4)

shuxinqin avatar shuxinqin commented on July 19, 2024 1

var orderUserIdQuery = this.DbContext.Query《Order》().Select(c => c.OrderUserId);
q.Where(a => !orderUserIdQuery.ToList().Contains(a.UserId) ).ToList();

注意,orderUserIdQuery.ToList() 要写在 Where 方法的 lambda 里

ps:Chloe没有AsQueryable方法

from chloe.

shuxinqin avatar shuxinqin commented on July 19, 2024

var qq = this.DbContext.Query().Select(c => c.Id);
q.Where(a => !qq.ToList().Contains(a.CityId) ).ToList();

from chloe.

xcl-net avatar xcl-net commented on July 19, 2024

System.NotSupportedException
HResult=0x80131515
Message=Does not support method 'Queryable.Contains(IQueryable`1 source,Int64 item)'.
Source=Chloe.MySql
语法不支持

查询没有购买订单的用户, 这个动作怎么能直接在数据库完成, 而不是我先通过程序查出来该买订单的用户id集合

from chloe.

xcl-net avatar xcl-net commented on July 19, 2024

System.NotSupportedException HResult=0x80131515 Message=Does not support method 'Queryable.Contains(IQueryable`1 source,Int64 item)'. Source=Chloe.MySql 语法不支持

查询没有购买订单的用户, 这个动作怎么能直接在数据库完成, 而不是我先通过程序查出来该买订单的用户id集合

改成右边的就可以, 但是这样把用户id都查询到内存里了, 我想着两个查询在一个sql里完成

from chloe.

Related Issues (20)

Recommend Projects

  • React photo React

    A declarative, efficient, and flexible JavaScript library for building user interfaces.

  • Vue.js photo Vue.js

    🖖 Vue.js is a progressive, incrementally-adoptable JavaScript framework for building UI on the web.

  • Typescript photo Typescript

    TypeScript is a superset of JavaScript that compiles to clean JavaScript output.

  • TensorFlow photo TensorFlow

    An Open Source Machine Learning Framework for Everyone

  • Django photo Django

    The Web framework for perfectionists with deadlines.

  • D3 photo D3

    Bring data to life with SVG, Canvas and HTML. 📊📈🎉

Recommend Topics

  • javascript

    JavaScript (JS) is a lightweight interpreted programming language with first-class functions.

  • web

    Some thing interesting about web. New door for the world.

  • server

    A server is a program made to process requests and deliver data to clients.

  • Machine learning

    Machine learning is a way of modeling and interpreting data that allows a piece of software to respond intelligently.

  • Game

    Some thing interesting about game, make everyone happy.

Recommend Org

  • Facebook photo Facebook

    We are working to build community through open source technology. NB: members must have two-factor auth.

  • Microsoft photo Microsoft

    Open source projects and samples from Microsoft.

  • Google photo Google

    Google ❤️ Open Source for everyone.

  • D3 photo D3

    Data-Driven Documents codes.