sql-server-ce

问题 SQL CE does not support TRUNCATE command. To clear a table I have to use DELETE. Is there a quicker/better way to clear the data then the following command? DELETE FROM FooTable WHERE id !='ABC' 回答1: You don't have any better way to do that, DELETE is the SQL Command for SQL CE to DELETE ROWS, anyway TRUNCATE TABLE deletes every row in a table, so your DELETE query must be executed also at SQL Server if you want to DELETE all the rows with id different from 'ABC'. In the case you want to

问题 SQL CE does not support TRUNCATE command. To clear a table I have to use DELETE. Is there a quicker/better way to clear the data then the following command? DELETE FROM FooTable WHERE id !='ABC' 回答1: You don't have any better way to do that, DELETE is the SQL Command for SQL CE to DELETE ROWS, anyway TRUNCATE TABLE deletes every row in a table, so your DELETE query must be executed also at SQL Server if you want to DELETE all the rows with id different from 'ABC'. In the case you want to

问题 I have an ASP.NET MVC 3 app that is using SQL Server CE 4.0 and Entity Framework 4.1 Code First. It works fine locally , but in production, it fails with the following error: The model backing the 'foobar' context has changed since the database was created. Either manually delete/update the database, or call Database.SetInitializer with an IDatabaseInitializer instance. For example, the DropCreateDatabaseIfModelChanges strategy will automatically delete and recreate the database, and

问题 Im using EntityFramework 6.1.0 I have 2 providers . MysqlClient and SQLServerCE, and i need to create 2 different DBContext. That forced me to create 2 configuration classes because mysql have some different things. But when i initialize the application, the Database.DefaultConnectionFactory is from the defaultConnectionFactory(config file) , and i cant specify what provider to take on the daterminated Context. How to do it? My config file: <entityFramework> <defaultConnectionFactory type=

问题 Started experimenting with git. Inadvertently added all the files in the project to "Included Changes" in Team Explorer. I committed all in an initial commit. One of those files was the SQL CE 4.0 (file-based) database. I clearly goofed there. I do not want to track the database nor do I want to end up restoring the db back to some previous point. My problem is I have no idea of how to move the SQL CE 4.0 sdf file from included changes to untracked. I am not experienced with git and all I

问题 I have this database: abcDEF ABCdef abcdef if I write: select * from MyTbl where A='ABCdef' how to get: ABCdef and how to get: abcDEF ABCdef abcdef Thanks in advance forgot to write - sqlCE 回答1: You can make your query case sensitive by making use of the COLLATE keyword. SELECT A FROM MyTbl WHERE A COLLATE Latin1_General_CS_AS = 'ABCdef' 回答2: If you have abcDEF, ABCdef, abcdef already in the database then it's already case sensitive or you have no constraint. You'd have to add a COLLATE on

问题 using (TransactionScope scope = new TransactionScope()) using (var context = new dwfEntities()) { var field = (from x in context.DynFields where x.Id == id select x).First(); //delete defaults foreach (var item in from x in context.DynFieldDefaults where x.DynField_Id == id select x) { context.DeleteObject(item); } context.SaveChanges(); //delete field context.DeleteObject(field); context.SaveChanges(); //commit scope.Complete(); } The code throws "The connection object can not be enlisted in

问题 I want to access Microsoft SQL Server Compact Edition databases from Java. How can I do that? I searched for JDBC driver for SQLCE, but I didn't find any. 回答1: According to a newsgroup post sent this Tuesday (2008-12-09) by Jimmy Wu@Mircrosoft: The Microsoft SQL Server JDBC Driver does not support connecting to SQL Server Compact. At this time there isn't a scheduled JDBC support for SQL Server Compact edition. Thank-you for your continuing support of SQL Server. Sincerely, Jimmy Wu 回答2:

问题 I'm done trying to Google for this. I have installed SQL Server CE 4.0, and have EF 4.1, but I can't get a proper connection string. Nothing on connectionstrings.com applies to me. I just want to create a SqlCeEngine object, but no matter what I try I get some exception. Most recently it's been Unknown connection option in connection string with either "metadata", "app", "provider", or "provider connection string" after it. I know EF requires metadata in the connection string. And I can't

问题 I implemented a bidirectional 1:1 relationship based on this answer: Primary /Foreign Key in Entity Framework I define the bidirectional relation this way: public class Student { public virtual int StudentId { get; set; } public virtual Anamnesis Anamnesis { get; set; } . . . } public class Anamnesis { [Key, ForeignKey("Student")] public int AnamnesisId { get; set; } public virtual Student Student { get; set; } . . . } where, Student is the principal entity and Anamnesis it the entity that