У меня возникла та же проблема, я исправил ее с помощью пользовательского класса, унаследованного от MySqlMigrationSqlGenerator, затем переопределил защищенный переопределенный метод MigrationStatement Generate (CreateIndexOperation op) , затем я создал новый класс EFConfiguration наследует от DbConfiguration и задает SetMigrationSqlGenerator с новым классом. это код:
using System;
using System.Collections.Generic;
using System.Data.Common;
using System.Data.Entity;
using System.Data.Entity.Migrations.History;
using System.Data.Entity.Migrations.Model;
using System.Data.Entity.Migrations.Sql;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.EntityFramework;
using MySql.Data.MySqlClient;
namespace customSqlGenerator.Contexto
{
/// <summary>
/// Inherit from MySqlMigrationSqlGenerator by fixing the Index generation method, set the default type in BTREE
/// <para>(the MySql manual says that in the SQL script syntax it is not necessary to specify it for the innoDB engine)</para>
/// </summary>
public class MyCustomMigrationSQLGenerator : MySqlMigrationSqlGenerator
{
private string TrimSchemaPrefix ( string table )
{
if ( table.StartsWith ( "dbo." ) )
return table.Replace ( "dbo.", "" );
return table;
}
protected override MigrationStatement Generate ( CreateIndexOperation op )
{
StringBuilder sb = new StringBuilder ( );
sb = sb.Append ( "CREATE " );
if ( op.IsUnique )
{
sb.Append ( "UNIQUE " );
}
sb.AppendFormat ( "index `{0}` on `{1}` (", op.Name, TrimSchemaPrefix ( op.Table ) );
sb.Append ( string.Join ( ",", op.Columns.Select ( c => "`" + c + "`" ) ) + ") " );
return new MigrationStatement ( ) { Sql = sb.ToString ( ) };
}
}
/// <summary>
/// Inherit from DbConfiguration to set the new QSL script generator and set the conditions to work with MySQL
/// </summary>
public class MyCustomEFConfiguration : DbConfiguration
{
public MyCustomEFConfiguration ()
{
AddDependencyResolver ( new MySqlDependencyResolver ( ) );
SetProviderFactory ( MySqlProviderInvariantName.ProviderName, new MySqlClientFactory ( ) );
SetProviderServices ( MySqlProviderInvariantName.ProviderName, new MySqlProviderServices ( ) );
SetDefaultConnectionFactory ( new MySqlConnectionFactory ( ) );
SetMigrationSqlGenerator ( MySqlProviderInvariantName.ProviderName, () => new MyCustomMigrationSQLGenerator ( ) );
SetManifestTokenResolver ( new MySqlManifestTokenResolver ( ) );
SetHistoryContext ( MySqlProviderInvariantName.ProviderName,
( existingConnection, defaultSchema ) => new MyCustomHistoryContext ( existingConnection, defaultSchema ) );
}
}
/// <summary>
/// Read and write the migration history of the database during the first code migrations. This class must be in the same assembly as the EF configuration
/// </summary>
public class MyCustomHistoryContext : HistoryContext
{
public MyCustomHistoryContext ( DbConnection existingConnection, string defaultSchema ) : base ( existingConnection, defaultSchema ) { }
protected override void OnModelCreating ( System.Data.Entity.DbModelBuilder modelBuilder )
{
base.OnModelCreating ( modelBuilder );
modelBuilder.Entity<HistoryRow> ( ).HasKey ( h => new { h.MigrationId } );
}
}
}
Затем в моем DBContext я добавляю атрибут с конфигурацией, пример:
[DbConfigurationType ( typeof ( MyCustomEFConfiguration ) )]
public class DataBaseContexto : IdentityDbContext<ApplicationUser, ApplicationRole, int, ApplicationUserLogin, ApplicationUserRole, ApplicationUserClaim>
{
public DataBaseContexto () : base ( "defaultConnection" )
{
this.Configuration.LazyLoadingEnabled = true;
}
}