mysql - Entity Framework 代码优先与 MySql 错误

Question

Entity Framework 版本 4.3+ 出现以下错误

http://www.cnblogs.com/shouzheng/archive/2012/03/09/2388177.html

(已翻译)Use EntityFramework the Code First Development and one case of MySql database problem

我想使用最新版本的 EF，因为版本 <= 4.1 不提供迁移功能。

MySql.Data.MySqlClient.MySqlException (0x80004005): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'NOT NULL, ProductVersion mediumtext NOT NULL);

ALTER TABLE __MigrationH' at line 6 at
MySql.Data.MySqlClient.MySqlStream.ReadPacket() at
MySql.Data.MySqlClient.NativeDriver.GetResult(Int32& affectedRow,
Int32& insertedId) at MySql.Data.MySqlClient.Driver.GetResult(Int32
statementId, Int32& affectedRows, Int32& insertedId) at
MySql.Data.MySqlClient.Driver.NextResult(Int32 statementId, Boolean
force) at MySql.Data.MySqlClient.MySqlDataReader.NextResult() at
MySql.Data.MySqlClient.MySqlCommand.ExecuteReader(CommandBehavior
behavior) at MySql.Data.MySqlClient.MySqlCommand.ExecuteNonQuery()
at System.Data.Objects.ObjectContext.ExecuteStoreCommand(String
commandText, Object[] parameters) at
System.Data.Entity.Internal.InternalContext.ExecuteSqlCommand(String
sql, Object[] parameters) at
System.Data.Entity.Database.ExecuteSqlCommand(String sql, Object[]
parameters) at
System.Data.Entity.Migrations.History.HistoryRepository.BootstrapUsingEFProviderDdl(XDocument
model) at
System.Data.Entity.Internal.InternalContext.<SaveMetadataToDatabase>b__4()
at
System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action
action) at
System.Data.Entity.Internal.InternalContext.SaveMetadataToDatabase()<br/>
at
System.Data.Entity.Internal.DatabaseCreator.CreateDatabase(InternalContext
internalContext, Func3 createMigrator, ObjectContext objectContext)
at System.Data.Entity.Internal.InternalContext.CreateDatabase(ObjectContext objectContext) at System.Data.Entity.Database.Create() at System.Data.Entity.DropCreateDatabaseAlways1.InitializeDatabase(TContext
context) at
System.Data.Entity.Database.<>c__DisplayClass21.b_0(DbContext c) at System.Data.Entity.Internal.InternalContext.<>c_DisplayClass8.b_6() at System.Data.Entity.Internal.InternalContext.PerformInitializationAction(Action action) at System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization() at System.Data.Entity.Internal.LazyInternalContext.b_4(InternalContext c) at System.Data.Entity.Internal.RetryAction1.PerformAction(TInput input)
at
System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction(Action1 action) at System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase()
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) at System.Data.Entity.Internal.Linq.InternalSet1.Initialize() at
System.Data.Entity.Internal.Linq.InternalSet1.get_InternalContext()
at System.Data.Entity.Internal.Linq.InternalSet1.ActOnSet(Action
action, EntityState newState, Object entity, String methodName) at
System.Data.Entity.Internal.Linq.InternalSet1.Add(Object entity)
at System.Data.Entity.DbSet`1.Add(TEntity entity) at DBPreparationTool.Form1.PrepareDB_Click(Object sender, EventArgs e) in D:\Workspaces\Experiments\FaizeMBRoot\Source\DBPreparationTool\Form1.cs:line 39 at System.Windows.Forms.Control.OnClick(EventArgs e) at System.Windows.Forms.Button.OnClick(EventArgs e) at System.Windows.Forms.ButtonBase.OnKeyUp(KeyEventArgs kevent) at System.Windows.Forms.Control.ProcessKeyEventArgs(Message& m) at System.Windows.Forms.Control.ProcessKeyMessage(Message& m) at System.Windows.Forms.Control.WndProc(Message& m) at System.Windows.Forms.ButtonBase.WndProc(Message& m) at System.Windows.Forms.Button.WndProc(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m) at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m) at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

Answer 1

请参阅此博文:http://brice-lambson.blogspot.com/2012/05/using-entity-framework-code-first-with.html