dapper

问题 It has long been true that you can execute multiple statements with SQL CE. And in fact I'm using SQL Server Compact Toolbox to do exactly that. But when I take the same multiple-statement commands and execute them from Dapper... public const string SampleDml = @" INSERT INTO [Plugin](Name, TypeName) VALUES ('Blog','Shroom.Blog'); GO INSERT INTO [ContentDef](PluginID, Name, Placement, IsStatic) VALUES(@@IDENTITY,'MyBlog','Layout:Left',1); GO "; I then keep getting this error: There was an

问题 I have an - IDbConnection - sql = @"UPDATE tablename SET json = :json, lastupdate = SYSDATE WHERE id = :id" var param = new DynamicParameters(); param.Add(":json", json, DbType.AnsiString); param.Add(":id", currentTemplate.Id); if (connection == null || connection.State != ConnectionState.Open) continue; connection.Execute(sql, param); // hangs here. connection.Query(sql, param); // tried this and this also hangs. Coding stops at connection.Execute. No error or anything. Just hangs. :json is

问题 I am using Dapper to Update and Insert Access DB. Code is working not throwing exception but its not updating the value in DB. Below is my code sql.Append("UPDATE drugs_repository SET drug_name = @DrugName "); sql.Append(" WHERE id = @DrugId"); var parameters = new { DrugName = objDrug.DrugName, DrugId = objDrug.DrugId }; var t = connection.Query<string>(sql.ToString(), parameters); Can someone please let me know what exactly I am missing in the above code? When I hardcode the value than its

问题 I have this call: public IObservable<T> Subscribe(object topic, string service, string connectionString, string query) { try { this.connection.ConnectionString = connectionString; this.connection.Open(); this.connection.Query<T>(query, new { transactionid = topic }).ToObservable().Subscribe(message => this.subject.OnNext(message)); return this.subject; } catch (Exception e) { this.subject.OnError(e); return this.subject; } finally { this.subject.OnCompleted(); this.connection.Close(); } }

问题 I am trying to use Dapper for our complex queries to remove any lost overhead that was previously existing with NH. I have the following query (note this has been considerably shrunk): SELECT DISTINCT * FROM tasks t WHERE t.initials = @UserInits Which is called via our repository as so: taskRepo.RawExec<TaskListItemDTO>(Query,new {UserInits = "SAS"}) Our implementation of DapperExec consist as follows: public IEnumerable<T> RawExec<T>(string SQL, object param) { return _session.Connection

问题 I want to do a bulk insert. A is an ID and B is a list of IDs. My insert statement looks like this but it is wrong. How do I rewrite it to work? The only solution I can think of is using a foreach loop outside the statement .Execute(@"insert into MyTable(a,b) select @a, @b", new {a, b}) 回答1: Try this: var abs = b.Select(id => new { a, b = id }); int numInserted = connection .Execute(@"insert into MyTable(a,b) VALUES(@a, @b)", abs); 来源： https://stackoverflow.com/questions/21209757/dapper

问题 Currently I'm trying to work with Named Parameters using SAP Sybase SQL Anywhere 12 with dapper. The following codes runs correctly: public class Test { public int Str1 { get; set; } public string Str2 { get; set; } } class Program { static void Main(string[] args) { using (SAConnection connection = new SAConnection("...")) { connection.Open(); Test test = connection.Query<Test>("SELECT :Str1 as Str1, :Str2 as Str2", new Test() { Str1 = 35, Str2 = "42" }).FirstOrDefault(); Console.WriteLine($

问题 I am starting with Dapper, the micro-ORM, and i use the Dapper Rainbow. I want to test the queries and the data retrieved by them. I mean, for example, i have the UserService with the method GetAll() , and i want to test that the sql query is retrieving all the users from some List (not from the database because i want the tests to be fast). Do you know how can i do that? My service class (and the method i want to test): public static class UserService{ public static IEnumerable<User> GetAll(

问题 Im trying to make a generic Find method with DapperExtensions This is my method public IEnumerable<T> Find(Expression<Func<T, object>> expression) { using (IDbConnection cn = GetCn()) { cn.Open(); var predicate = Predicates.Field<T>(expression, Operator.Eq, true); return cn.GetList<T>(predicate); } } But i get System.NullReferenceException on this row var predicate = Predicates.Field<T>(expression, Operator.Eq, true); This is from the DapperExtensions help documentation But I try convert this

问题 I've got a query that should contain a literal at sign ( @ ). How do I express this with a Dapper query? var num = cnx.Query<int>("declare @foo int = 2; select @foo").Single(); I've tried using literals as a workaround: var num = cnx.Query<int>( "declare {=at}foo int = 2; select {=at}foo", new { at = "@" } ).Single(); But this throws a NotSupportedException since string literals aren't supported... (Note that in my real code, I've got other @parameters that I actually do want replaced and