C# Entity Framework context.database.create()仍在我的类中:DbMigration
你好!我想了解一下为什么context.Database.Create()仍然在我的类中使用:DbMigration。如果我不删除我的数据库,迁移工作正常。但是如果我放弃我的数据库并开始一个新的。它将遍历我的迁移列表并尝试更新,并将返回一个关于dbo的错误。“tablename”未找到 这是密码C# Entity Framework context.database.create()仍在我的类中:DbMigration,c#,entity-framework,ef-code-first,entity-framework-migrations,C#,Entity Framework,Ef Code First,Entity Framework Migrations,你好!我想了解一下为什么context.Database.Create()仍然在我的类中使用:DbMigration。如果我不删除我的数据库,迁移工作正常。但是如果我放弃我的数据库并开始一个新的。它将遍历我的迁移列表并尝试更新,并将返回一个关于dbo的错误。“tablename”未找到 这是密码 public class DMSDbContextInitializer : DMSDbContextInitializerBase, IDatabaseInitializer<DMSDb
public class DMSDbContextInitializer : DMSDbContextInitializerBase, IDatabaseInitializer<DMSDbContext>
{
public void InitializeDatabase(DMSDbContext context)
{
var dbname = context.Database.Connection.Database;
if (context.Database.Exists())
{
var migrator = new DbMigrator(new MigrationConfiguration
{
AutomaticMigrationsEnabled = false
});
//Get all pending migrations
var pendingmigrations = migrator.GetPendingMigrations().Select(x => new
{
numericid = Convert.ToInt64(x.Split(new[] { '_' })[0]),
migrationid = x
}).ToList();
//Get last migration entry
var latestMigrationHistory = context.GetMigrationHistories().OrderByDescending(x => x.MigrationId).FirstOrDefault();
if (latestMigrationHistory != null)
{
var latestmigrationid = Convert.ToInt64(latestMigrationHistory.MigrationId.Split(new[] { '_' })[0]);
var prevmigrations = pendingmigrations.Where(x => x.numericid < latestmigrationid);
//exclude all prev migration in update and insert a fake history table record for each
foreach (var prevmigration in prevmigrations)
{
context.Database.ExecuteSqlCommand(TransactionalBehavior.DoNotEnsureTransaction,
@"INSERT INTO __MigrationHistory (MigrationId,ContextKey,Model, ProductVersion) VALUES (@p0,@p1,@p2,@p3)",
prevmigration.migrationid,
migrator.Configuration.ContextKey,
latestMigrationHistory.Model,
latestMigrationHistory.ProductVersion
);
}
}
//Execute all valid pending migrations
if (migrator.GetPendingMigrations().Any())
migrator.Update();
/*Some seed and update codes*/
context.SaveChanges();
}
else
{
//Create db
context.Database.Create();
ConfigureFileTableSupport(context, dbname);
ConfigureImageFileTableSupport(context, dbname);
//Initial Data
Seed(context);
}
公共类DMSDbContextInitializer:DMSDbContextInitializerBase,IDatabaseInitializer
{
public void InitializeDatabase(DMSDbContext上下文)
{
var dbname=context.Database.Connection.Database;
if(context.Database.Exists())
{
var migrator=新的DbMigrator(新的MigrationConfiguration
{
AutomaticMiggerationsEnabled=错误
});
//获取所有挂起的迁移
var pendingmigrations=migrator.GetPendingMigrations()。选择(x=>new
{
numericid=Convert.ToInt64(x.Split(new[]{'.})[0]),
迁移ID=x
}).ToList();
//获取上次迁移条目
var latestMigrationHistory=context.GetMigrationHistories().OrderByDescending(x=>x.MigrationId).FirstOrDefault();
如果(latestMigrationHistory!=null)
{
var latestmigrationid=Convert.ToInt64(latestMigrationHistory.MigrationId.Split(new[]{'.})[0]);
var previmigrations=pendingmigrations.Where(x=>x.numericid
在我的context.Database.Create()中,如果我按F11,它将遍历我的类:DbMigration。我似乎找不到这里的错误
这里是DbContext
public class DMSDbContext : BaseDbContext, IDMSDbContext
{
public DMSDbContext()
: base("DMSCtx")
{
}
public DMSDbContext(string connectionstring)
: base(connectionstring)
{
}
public IDbSet<FileMetadata> FileMetadata { get; set; }
public IDbSet<FileMetadataContent> FileMetadataContents { get; set; }
public IDbSet<SharedFile> SharedFiles { get; set; }
public IDbSet<AuditFileMetadata> AuditFileMetadata { get; set; }
public ITransactionScope CreateTransactionScope()
{
return new EfTransactionScope(Database.BeginTransaction());
}
public IEnumerable<T> SqlQuery<T>(string sql, params object[] parameters)
{
return Database.SqlQuery<T>(sql, parameters);
}
public int ExecuteSqlCommand(string sql, params object[] parameters)
{
return Database.ExecuteSqlCommand(sql, parameters);
}
public string DatabaseName
{
get { return Database.Connection.Database; }
}
/// <summary>
/// Query the Migration History Table
/// </summary>
/// <returns></returns>
public IList<MigrationHistory> GetMigrationHistories()
{
return Database.SqlQuery<MigrationHistory>("select * from __migrationhistory").ToList();
}
}
public interface IDMSDbContext
{
IDbSet<FileMetadata> FileMetadata { get; set; }
IDbSet<FileMetadataContent> FileMetadataContents { get; set; }
IDbSet<SharedFile> SharedFiles { get; set; }
IDbSet<AuditFileMetadata> AuditFileMetadata { get; set; }
int SaveChanges();
DbContextConfiguration Configuration { get; }
ITransactionScope CreateTransactionScope();
IEnumerable<T> SqlQuery<T>(string sql, params object[] parameters);
int ExecuteSqlCommand(string sql, params object[] parameters);
string DatabaseName { get; }
}
公共类DMSDbContext:BaseDbContext,IDMSDbContext
{
公共DMSDbContext()
:base(“DMSCtx”)
{
}
公共DMSDbContext(字符串连接字符串)
:基本(连接字符串)
{
}
公共IDbSet文件元数据{get;set;}
公共IDbSet FileMetadataContents{get;set;}
公共IDbSet共享文件{get;set;}
公共IDbSet AuditFileMetadata{get;set;}
公共ITransactionScope CreateTransactionScope()
{
返回新的EfTransactionScope(Database.BeginTransaction());
}
公共IEnumerable SqlQuery(字符串sql,参数对象[]参数)
{
返回Database.SqlQuery(sql,参数);
}
public int ExecuteSqlCommand(字符串sql,参数对象[]参数)
{
返回Database.ExecuteSqlCommand(sql,参数);
}
公共字符串数据库名
{
获取{return Database.Connection.Database;}
}
///
///查询迁移历史记录表
///
///
公共IList GetMigrationHistories()
{
return Database.SqlQuery(“select*from _migrationhistory”).ToList();
}
}
公共接口IDMSDbContext
{
IDbSet FileMetadata{get;set;}
IDbSet FileMetadataContents{get;set;}
IDbSet SharedFiles{get;set;}
IDbSet AuditFileMetadata{get;set;}
int SaveChanges();
DbContextConfiguration配置{get;}
ITransactionScope CreateTransactionScope();
IEnumerable SqlQuery(字符串sql,参数对象[]参数);
int EXECUTESQLCOMAND(字符串sql,参数对象[]参数);
字符串数据库名{get;}
}
我不知道您为什么要实现“精确的”/接近EF迁移工作原理的功能 在CreateDatabaseIfNotExists数据库初始化策略之后,您所做的不是吗? 还是只是我没有把你的问题读得足够好
public class SchoolDBContext: DbContext
{
public SchoolDBContext(): base("SchoolDBConnectionString")
{
Database.SetInitializer<SchoolDBContext>(new CreateDatabaseIfNotExists<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new DropCreateDatabaseIfModelChanges<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new DropCreateDatabaseAlways<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new SchoolDBInitializer());
}
public DbSet<Student> Students { get; set; }
public DbSet<Standard> Standards { get; set; }
}
公共类SchoolDBContext:DbContext
{
public SchoolDBContext():base(“SchoolDBConnectionString”)
{
SetInitializer(新的CreateDatabaseIfNotExists());
//SetInitializer(新的DropCreateDatabaseIfModelChanges());
//SetInitializer(新的DropCreateDatabaseAlways());
//SetInitializer(new SchoolDBInitializer());
}
公共数据库集学生{get;set;}
公共数据库集标准{get;set;}
}
阅读更多:
关于迁移的更多信息:我不知道您为什么要实现“精确的”/“接近EF迁移工作原理”的功能 在CreateDatabaseIfNotExists数据库初始化策略之后,您所做的不是吗? 还是只是我没有把你的问题读得足够好
public class SchoolDBContext: DbContext
{
public SchoolDBContext(): base("SchoolDBConnectionString")
{
Database.SetInitializer<SchoolDBContext>(new CreateDatabaseIfNotExists<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new DropCreateDatabaseIfModelChanges<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new DropCreateDatabaseAlways<SchoolDBContext>());
//Database.SetInitializer<SchoolDBContext>(new SchoolDBInitializer());
}
public DbSet<Student> Students { get; set; }
public DbSet<Standard> Standards { get; set; }
}
公共类SchoolDBContext:DbContext
{
public SchoolDBContext():base(“SchoolDBConnectionString”)
{
SetInitializer(新的CreateDatabaseIfNotExists());
//SetInitializer(新的DropCreateDatabaseIfModelChanges());
//SetInitializer(新的DropCreateDatabaseAlways());
//Database.SetInitializer(