我已准备好我的模型代码优先EF ,我在 sql express 和工作上尝试。但我在将其转换为 sql server 时遇到问题:我没有权限重新创建数据库我只能将表添加到空数据库。
我已经看到this answer 但是当我试图复制它时,我对上下文部分有一些麻烦:
public class DropCreateDatabaseTables : IDatabaseInitializer<Context> {
#region IDatabaseInitializer<Context> Members
public void InitializeDatabase(Context context)
我已经将引用放到了System.Data.Entity但是没有用,并且Context类不是System.Runtime.Remoting.Contexts上引用的
代码有问题吗?或者使用EF的最后一个工具是一个更好的解决方案吗?
修改
最后是:
的DbContext:
public class PeopleContext: DbContext
{
public DbSet<Person> People { get; set; }
public DbSet<Adress> Adresses{ get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
// Add Entity type configuration classes
modelBuilder.Configurations.Add(new PersonConfiguration());
modelBuilder.Configurations.Add(new AdressConfiguration());
}
}
初始化器:
public class DropCreateDatabaseTables : IDatabaseInitializer<PeopleContext>
{
public void InitializeDatabase(PeopleContextContext)
{
bool dbExists;
using (new TransactionScope(TransactionScopeOption.Suppress))
{
dbExists = Context.Database.Exists();
}
if (dbExists)
{
// remove all tables
Context.Database.ExecuteSqlCommand("EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'");
Context.Database.ExecuteSqlCommand("EXEC sp_MSforeachtable @command1 = \"DROP TABLE ?\"");
// create all tables
var dbCreationScript = ((IObjectContextAdapter)Context).ObjectContext.CreateDatabaseScript();
Context.Database.ExecuteSqlCommand(dbCreationScript);
Context.SaveChanges();
}
else
{
throw new ApplicationException("No database instance");
}
}
}
呼叫:
class Program
{
static void Main(string[] args)
{
var person= new Person
{
Identifier= "John Doe"
};
Database.SetInitializer(new DropCreateDatabaseTables());
using (var context = new PeopleContext())
{
context.People.Add(person);
context.SaveChanges();
}
}
}
感谢Lukas Kabrt!
答案 0 :(得分:3)
示例中的Context
类应该是您的DbContext
类,即您指定DbSet<>
的类。
示例:的
DbContext类
public class DataContext : DbContext {
public DbSet<Customer> Customers { get; set; }
}
<强> DatabaseInitializer 强>
public class DropCreateDatabaseTables : IDatabaseInitializer<DataContext> {
...
}