使用 Linq to sql 在子表中插入数据（3 层架构）

Question

我被 asp.net 中的一个简单代码困住了 我想将简单的字符串值插入到 1 个父表（帐户）和 1 个子表（Applicant_bio）。 现在是这样，我可以将数据放入父表中，但是当我尝试访问子表时，它给了我以下错误：

The INSERT statement conflicted with the FOREIGN KEY constraint linq to sql

我已明确将两个主键的值设置为匹配，因此不存在冲突，因为表具有 1 对 1 的关系。 这是我的代码：

public string Retreive_Applicants(Applicant_list user_details)
        {
            newDatabaseDataContext connection = new newDatabaseDataContext();
            //Create a new instance of the applicant object
           account account = new account();
           account.account_id = 1;
           account.account_type = "Applicant";
           account.account_description = "";
           account.account_title = user_details.account_title;
           account.account_password = user_details.account_password;
           connection.accounts.InsertOnSubmit(account);
           connection.SubmitChanges();



           account.applicant_bio= new applicant_bio();
           account.applicant_bio.account_id = account.account_id; //Here's Where I have explicitly set the account id of applicant_bio to account_id of accounts table just created
           account.applicant_bio.applicant_name = user_details.applicant_name;
           account.applicant_bio.applicant_age = user_details.applicant_age;
           account.applicant_bio.applicant_cnic = user_details.applicant_cnic;
           connection.applicant_bios.InsertOnSubmit(account.applicant_bio);
           connection.SubmitChanges(); //Here's where the error occurs
            return "success";
        }

这是数据库详细信息 enter image description here

Answer 1

发生错误是因为 linq 了解您正在尝试使用申请人生物保存一个已经存在的新帐户对象，请尝试同时保存它以这种方式工作：

public string Retreive_Applicants(Applicant_list user_details)
        {
            newDatabaseDataContext connection = new newDatabaseDataContext();
            //Create a new instance of the applicant object
           account account = new account();
           account.account_id = 1;
           account.account_type = "Applicant";
           account.account_description = "";
           account.account_title = user_details.account_title;
           account.account_password = user_details.account_password;

           account.applicant_bio= new applicant_bio();
           //You dont need this line any more
           //account.applicant_bio.account_id = account.account_id; 
           account.applicant_bio.applicant_name = user_details.applicant_name;
           account.applicant_bio.applicant_age = user_details.applicant_age;
           account.applicant_bio.applicant_cnic = user_details.applicant_cnic;           
           connection.accounts.InsertOnSubmit(account);
           connection.SubmitChanges();
            return "success";
        }