dapper | 易学教程

How do I map multiple lists with dapper

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问题 I've got three classes User, Order & Project which are stored in single tables. The orders and projects both have a n:n relation with the users. To implement that I've got two crosstables (UserOrders, UserProjects) which map these relations. public class User { public string UserID {get;set;} public List<string> Orders{get;set;} public List<string> Projects {get;set;} } public class Order { public string OrderID {get;set} ... } public class Project { public string ProjectID {get;set} ... } As

Dapper: Execute a command multiple times and linq and ToArray

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问题 According to the dapper docs one can write connection.Execute(@"insert into MyTable(colA, colB) values (@a, @b)", new[] { new { a=1, b=1 }, new { a=2, b=2 }, new { a=3, b=3 } } ) I tried using conn.Execute( @" insert into RelRoleUser ( RoleID, UserID ) values( @roleID, @userID )", userroleList.Select(r => new { roleID = r.roleID, userID = r.userID }).ToArray(), null, null, null); But get an exception "Invalid type owner for DynamicMethod" in Dapper code private static Action<IDbCommand,

ORM-Dapper：Dapper列表

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ylbtech-ORM-Dapper：Dapper列表 1. 返回顶部 1.1、 https://dapper-tutorial.net/ 1.2、 2.1、 https://www.nuget.org/packages/Dapper/ 2.2、 2. 返回顶部 3. 返回顶部 1.1、 https://dapper-plus.net/ 1.2、 https://dapper-plus.net/online-examples 1.3、 4. 返回顶部 5. 返回顶部 6. 返回顶部作者： ylbtech 出处： http://ylbtech.cnblogs.com/ 本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利。来源： https://www.cnblogs.com/storebook/p/11121235.html

一款高效开发平台简介，基于微软.net平台

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 平台介绍 Learun快速开发平台是一个.net中后台应用解决方案（.net分布式快速开发框架）；前端基于Bootstrap，促使前端高效开发；后端基于ASP.NET MVC5和Dapper框架，提供一套快速开发框架。平台实现通用的基础功能、权限验证、安全验证，为中小型企业提供稳定、高效、安全、便捷的一体式框架。平台功能地址 https://www.learun.cn/ 基础功能 l 用户登录/修改密码/退出 l 菜单管理/用户管理（数据授权、权限授权、新增用户） l 用户安全控制（重置密码、用户操作异常锁定、修改密码等） l 权限管理中心（自定义表单权限、普通权限） l 精细化权限控制，控制到按钮的显示 l 数据字典管理/单据编码管理 l 登录日志/操作日志/访问日志/异常日志 l 文件上传/图片上传 l 通用导入导出excel功能 l 定时任务/任务管理/任务监控高级功能 l 数据权限管理和验证 l 平台模板管理和发布 l 文章管理和发布 l 智能查询平台特点来源： oschina 链接： https://my.oschina.net/u/4148883/blog/3153387

How to return List<dynamic> with Dapper.NET ORM that can bindable?

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问题 This question is old now, Dapper data-view binding are fixed as shown answer below :) 回答1: I've added TypeDescriptor -based bindings to DapperRow , which means that anything obtained via Query() (the dynamic API) should now bind to much common UI controls. Anything from 1.60.5 or above should work. Let me know! Caveat: it doesn't currently work for empty results (zero rows). I know how to implement that (see notes here), but that would require some additional changes to the query

How to return List<dynamic> with Dapper.NET ORM that can bindable?

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How to use Parameter List of integers for Oracle with Dapper?

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问题 I am trying to re-write some code to use Dapper so I can easily use parameters. I am trying to execute an UPDATE statement on an Oracle database. A list of IDs to UPDATE is passed in as List<int> as parameter. I want to update a field for each of the IDs passed in. The following is what I have: OracleConnection connection = ... // set earlier public int IncreaseProcessCount(List<int> ids) { var rowsAffected = connection.Execute(@"UPDATE TABLE SET PROCESSED_COUNT = PROCESSED_COUNT + 1 WHERE ID

How to insert multiple integer parameters into query?

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问题 Website user can enter search criteria to query orders. User, States, Status, OrderID, etc. Website communicates with API. Query parameters are in the header, so I assume they come in as strings. API communicates with Access via Dapper. For some criteria, they can send multiple values. So I want to use an "IN" clause. where UserID in (150, 3303, 16547) Dapper handles this nicely. connection.Query<int>("select * from table where Id in @Ids", new { Ids = new int[] { 1, 2, 3 } }); This works in

What's the difference between [Computed] and [Write(false)] attributes?

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问题 This resource explains how Computed excludes a property (in an update only?). Specifie the property should be excluded from update. [Table("Invoice")] public class InvoiceContrib { [Key] public int InvoiceID { get; set; } public string Code { get; set; } public InvoiceKind Kind { get; set; } [Write(false)] [Computed] public string FakeProperty { get; set; } } using (var connection = My.ConnectionFactory()) { connection.Open(); var invoices = connection.GetAll<InvoiceContrib>().ToList(); //

Dapper Query incorrectly maps the entity ID

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问题 I have 2 entity classes: public class PostTag { public int Id { get; set; } public string Alias { get; set; } public string Name { get; set; } public int Level { get; set; } } public class PostTagIndex { public int Id { get; set; } public int PostTagId { get; set; } } I want to draw attention to the fact that both of them have the same field named 'Id'. Next, I use Query(...) method this way: List<PostTag> postTags = cn.Query<PostTag>(postTagsSql, new { postId }).AsList(); Here is the