System.Data.SqlClient.SqlException: 'INSERT 语句与 FOREIGN KEY 约束冲突

Question

我在调试期间仍然收到此错误。我不知道该怎么做，因为我已经为 Person 类添加了 AdddressID。

请帮忙！

INSERT 语句与 FOREIGN KEY 约束 \"FK_Person_ToAddress\" 冲突。数据库“DirectoryDatabase”、表“dbo.Address”、“AddressID”列中发生冲突

引发此错误的函数是：

    public void CreatePersonDB(ref Person person)
    {
        string CreatePerson =
            @"INSERT INTO [Person] (FirstName, MiddleName, LastName, AddressID)
                                    OUTPUT INSERTED.PersonID  
                                    VALUES (@FName, @MName, @LName, @AID)";

        using (SqlCommand cmd = new SqlCommand(CreatePerson, OpenConnection))
        {
            // Get your parameters ready                    
            cmd.Parameters.AddWithValue("@FName", person.FirstName);
            cmd.Parameters.AddWithValue("@MName", person.MiddleName);
            cmd.Parameters.AddWithValue("@LName", person.LastName);
            cmd.Parameters.AddWithValue("@AID", person.PrimaryAddress.AddressID);

             try
            {
                person.PersonID = (int)cmd.ExecuteScalar(); //Returns the identity of the new tuple/record}
            }
            catch
            {
                Console.WriteLine("Adresse ID doesn't exist, do you want to add it? [y/n]");
                ConsoleKeyInfo input = Console.ReadKey();

                if (input.Key == ConsoleKey.Y)
                {
                    //create an insert query to the dbo.Adresse the same way you did with the dbo.person.
                    CreateAddressDB();
                }
        }
    }

Person & Address 的数据库 sql 代码如下所示（编辑后）：

CREATE TABLE Address (
AddressID      BIGINT IDENTITY(1,1) NOT NULL,
StreetName     NVARCHAR(MAX) NOT NULL,
HouseNumber    NVARCHAR(MAX) NOT NULL,

CityID         BIGINT NOT NULL,

[PersonID] NCHAR(10) 非空， [PrimaryAddress] INT NOT NULL， CONSTRAINT pk_Address PRIMARY KEY CLUSTERED (AddressID), 约束 fk_Address 外键（CityID） 参考城市 (CityID) 删除无操作 更新无操作）

这是地址表：

CREATE TABLE Person (
PersonID       BIGINT IDENTITY(1,1) NOT NULL,
FirstName      VARCHAR(50) NOT NULL,
MiddleName     NVARCHAR(50) NOT NULL,
LastName       NVARCHAR(50) NOT NULL,

AddressID      BIGINT NOT NULL,

CONSTRAINT pk_Person PRIMARY KEY CLUSTERED (PersonID), 约束 fk_Person 外键（地址 ID） 参考地址 (AddressID) )

Answer 1

在表 dbo.Address 中不存在您的 person.PrimaryAddress.AddressID 值的记录

Answer 2

您正在尝试将AdresseID 插入到Adresse 表中不存在的人员表中。

试试这个：

public void CreatePersonDB(ref Person person)
{
    string CreatePerson =
        @"INSERT INTO [Person] (FirstName, MiddleName, LastName, AddressID)
                                OUTPUT INSERTED.PersonID  
                                VALUES (@FName, @MName, @LName, @AID)";

    using (SqlCommand cmd = new SqlCommand(CreatePerson, OpenConnection))
    {
        // Get your parameters ready                    
        cmd.Parameters.AddWithValue("@FName", person.FirstName);
        cmd.Parameters.AddWithValue("@MName", person.MiddleName);
        cmd.Parameters.AddWithValue("@LName", person.LastName);
        cmd.Parameters.AddWithValue("@AID", person.PrimaryAddress.AddressID);

        try()
        {
            person.PersonID = (int)cmd.ExecuteScalar();   // Returns the identity of the new tuple/record}
        catch()
        {
             DialogResult dialogResult = MessageBox.Show("Adresse ID doesn't exist, do you want to add it?", "Alerte",MessageBoxButtons.YesNo);

             if(dialogResult == DialogResult.Yes)
             {
                 // create an insert query to the dbo.Adresse the same way you did with the dbo.person.
             }
        }
    }
}