我正在使用 EF5
将一些数据从一个数据库迁移到另一个数据库。我通常会使用 SQL
来完成类似的操作,但我需要其他功能(例如在 MembershipProvider
中创建用户),并希望在 EF 中完成这一切。我正在迁移大约 100k 行并使用它来执行此操作:
using (var connection = new SqlConnection(connectionString))
{
using(var command = new SqlCommand(commandText, connection))
{
connection.Open();
using (SqlDataReader reader = command.ExecuteReader())
{
while (reader.Read())
{
var employer = new Employer();
employer.EAN = reader["EAN"].ToString();
employer.Name = GetString(reader["EmpName"]);
employer.TaxMailingAddress = new Address
{
StreetAddress = GetString(reader["Street"]),
City = GetString(reader["City"]),
State = GetString(reader["USState"]),
ZipCode = GetString(reader["Zip"])
};
employer.TaxMailingAddress.SaveOrUpdate();
employer.SaveOrUpdate(); // This is where the timeout happens
string dba = GetString(reader["DBA"]);
if (!string.IsNullOrWhiteSpace(dba))
{
employer.AddDBA(new EmployerDba
{
Name = dba
});
}
string email = GetString(reader["Email"]);
if (!string.IsNullOrWhiteSpace(email))
{
var user = CreateNewUser(email);
if (user != null)
{
user.AddAuthorizedEmployer(employer);
user.AddRole(EmployerRole.Admin, employer, true);
}
}
}
}
}
}
我的SaveOrUpdate
方法非常简单:
public void SaveOrUpdate()
{
using (var db = new MyContext())
{
if (db.Employers.FirstOrDefault(x => x.EAN == EAN && x.Id != Id) != null)
throw new Exception("An employer with this EAN has already been registered.");
var employer = new Employer();
if (Id == 0)
{
db.Employers.Add(employer);
employer.CreatedBy = Statics.GetCurrentUserName();
employer.DateCreated = DateTime.Now;
}
else
{
employer = db.Employers.FirstOrDefault(x => x.Id == Id);
employer.ModifiedBy = Statics.GetCurrentUserName();
employer.DateModified = DateTime.Now;
}
employer.EAN = EAN;
employer.Name = Name;
if (TaxMailingAddress != null) employer.TaxMailingAddress = db.Addresses.FirstOrDefault(x => x.Id == TaxMailingAddress.Id);
if (SingleSeparationStatementAddress != null) employer.SingleSeparationStatementAddress = db.Addresses
.FirstOrDefault(x => x.Id == SingleSeparationStatementAddress.Id);
db.SaveChanges();
Id = employer.Id;
}
}
完成该任务大约需要 2.5 小时。但是,在运行数千行(有时 80k,有时少至 7k)之后,我收到此“等待操作超时”异常,始终在 employer.SaveOrUpdate();
。它与 employer.TaxMailingAddress.SaveOrUpdate();
的距离有什么关系吗?是否有“等待交易完成”的交易?也许确保连接有效,如果没有尝试重新创建它或其他什么?感谢您的帮助。
最佳答案
问题最终是用于连接到另一个数据库(我从中获取要导入的数据)的初始数据库连接超时。因此,我最终循环遍历了所有 reader.Read() 语句并将其放入数组中。然后,我循环访问该数组以实际处理数据并将其保存到我的新数据库中。
关于c# - EntityFramework 长时间运行任务的等待操作超时,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/19229258/