sql-server-ce

问题 I found a msdn doc on recommendations for mapping datatypes between sql server 2008 and sql ce 3.5 in .NET. This actually shows a color coded matrix. Unfortunately I am not able to find the link to it now. However, that doc recommended to use VARCHAR(MAX) / NVARCHAR(MAX) and DATETIME2 so that when .NET converts them to string & DateTime, they would better match the datatype limits. It was said that the (MAX) will be converted to (4000). But when I tried to use them to define the

问题 Using EF6 code-first migrations, I am able to successfully save models and create new migrations for them. However, my DbContext class is in a Sharp.Data project, the actual (Sql CE) database lives under the Sharp.Server project bin folder, and my models live in a Sharp.Common project. When I run add-migration -ProjectName Sharp.Data Migration3 (pointing to Sharp.Data as that is where the DbContext is), it successfully runs and identifies changes made to the models in the Sharp.Common project

问题 i use entity framwork with SQL Server CE 3.5 and i have this error The specified store provider cannot be found in the configuration, or is not valid. <Schema Namespace="OimDBModel.Store" Alias="Self" Provider="System.Data.SqlServerCe.3.5" ProviderManifestToken="3.5" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl"> <EntityContainer Name="OimDBModelStoreContainer"> <EntitySet Name="OfflineMessages"

问题 DatabaseEntities de = new DatabaseEntities(); Income income = de.Incomes.CreateObject(); income.Id = de.Incomes.Max(f => f.Id) + 1; income.Person = Users.SelectedValue.ToString(); income.Value = value; income.Unit = Unit.SelectedValue.ToString(); income.Description = Desc.Text; de.Incomes.AddObject(income); de.SaveChanges(); I have used the code section above to insert an Income object into SQL Compact database after that i have used the following statement to bind data to a DataGridView:

问题 I can't Insert and select from Local database data in C#. I've read these articles C# - Writing data in local database http://msdn.microsoft.com/en-us/library/system.data.sqlserverce.sqlceconnection(v=vs.100).aspx How to add local database items into textBox using listBox in C# All the code samples are the same, here's my sample. SqlCeConnection conn = new SqlCeConnection(@"Data Source=|DataDirectory|\PacjenciDB.sdf"); conn.Open(); SqlCeCommand cmd = conn.CreateCommand(); cmd.CommandText=

问题 I have successfully built a desktop application and published it with Visual Studio. The prerequisites are .Net Framework 40 and SQL Server CE. When I run the installer on a machine with none of these, it runs and installs both prerequisites well. But when it comes to installing the application itself, I get a pop up titled SYSTEM UPDATE REQUIRED Unable to install or run the application. The application requires that assembly MicrosoftSqlServerCe.Client version 4.0.0.0 be installed in the

问题 I am building a library for Windows Phone 8 which requires local databases. Here is my understanding of how the LINQ-to-SQL works and creates database: DataContext object is created from the corresponding class. When CreateDatabase() method is called, it reads the connection string and the members of type Table from the DataContext object. The method creates database at given location and creates tables corresponding to the members of DataContext object. Now, the DataContext class has to be

问题 I am trying to use Entity Framework with SQL Server Compact. I can perform reading such as : var context = new TestEntities(); foreach (var p in context.Personnes) { Console.WriteLine(p.prenom + " " + p.nom); } but I can't perform insert : var context = new TestEntities(); context.Personnes.AddObject(new Personne() {nom = "Test", prenom = "Test" }); context.SaveChanges(); An UpdateException is raised when I try to do this. The Personne table has just 3 columns: id (int, primary key), nom

问题 I am working on a ASP.NET Web Pages site with SQL Server CE 4.0. I believe my SQL Server CE 4.0 database is working fine. I can connect to it without any problems on my dev machine with and without Entity Framework. Once I push the site to the server, I can connect to it fine without entity framework using this connection string: <add name="StarterSite" connectionString="Data Source=|DataDirectory|\StarterSite.sdf" providerName="System.Data.SqlServerCe.4.0" /> My Entity Framework connection

问题 My application is running on Windows CE 6.0, and it uses a SQL Server CE .sdf file to store user data. The application is running on an industrial device, which is not connected to internet. The only way to update the software is to plug a USB stick inside. As expected, the first release 1.0 of the application needs to update to 1.1 now, the database schema as well. How could I merge the .sdf version 1.0 which is on the device with the latest 1.1 database schema that will be available through