SqlException: 插入语句与外键约束冲突

如何解决SqlException: 插入语句与外键约束冲突

我正在尝试向数据库中的两个表添加值，一个包含主键，另一个是纯外键。我试过先用主键再用外键添加到表中，但无济于事。

表单上执行插入命令的代码：

public static int AddBooking(int DogID,int ClientID)
{
    using (sqlConnection connection = new sqlConnection(_connectionstring))
    {
        connection.open();

        sqlCommand insertClientCommand = new sqlCommand();
        insertClientCommand.Connection = connection;
        insertClientCommand.CommandType = System.Data.CommandType.StoredProcedure;
        insertClientCommand.CommandText = "AddBooking";

        insertClientCommand.Parameters.Add(new sqlParameter("@DogID",DogID));
        insertClientCommand.Parameters.Add(new sqlParameter("@ClientID",ClientID));

        int rowsAffected = insertClientCommand.ExecuteNonQuery();

        connection.Close();

        return rowsAffected;
    }
}

public static int AddBookingInfo(string GroomOption,string Hair,string Teeth,string Nails,string DateOfAppointment,string IsFirstTime,string StartTime,string FinishTime,string Duration,double Price)
{
    using (sqlConnection connection = new sqlConnection(_connectionstring))
    {
        connection.open();

        sqlCommand insertClientCommand = new sqlCommand();
        insertClientCommand.Connection = connection;
        insertClientCommand.CommandType = System.Data.CommandType.StoredProcedure;
        insertClientCommand.CommandText = "AddBookingInfo";

        insertClientCommand.Parameters.Add(new sqlParameter("@GroomOption",GroomOption));
        insertClientCommand.Parameters.Add(new sqlParameter("@Hair",Hair));
        insertClientCommand.Parameters.Add(new sqlParameter("@Teeth",Teeth));
        insertClientCommand.Parameters.Add(new sqlParameter("@Nails",Nails));
        insertClientCommand.Parameters.Add(new sqlParameter("@DateOfAppointment",DateOfAppointment));
        insertClientCommand.Parameters.Add(new sqlParameter("@IsFirstTime",IsFirstTime));
        insertClientCommand.Parameters.Add(new sqlParameter("@StartTime",StartTime));
        insertClientCommand.Parameters.Add(new sqlParameter("@FinishTime",FinishTime));
        insertClientCommand.Parameters.Add(new sqlParameter("@Duration",Duration));
        insertClientCommand.Parameters.Add(new sqlParameter("@Price",Price));

        int rowsAffected = insertClientCommand.ExecuteNonQuery();

        connection.Close();

        return rowsAffected;
    }
}

ProjectDal 中的代码：

CREATE TABLE [dbo].[BookingInfo] 
(
    [BookingID]         INT IDENTITY (101,1) NOT NULL,[GroomOption]       NCHAR(10)    NULL,[Hair]              NCHAR(10)    NULL,[Teeth]             NCHAR(10)    NULL,[Nails]             NCHAR(10)    NULL,[DateOfAppointment] NVARCHAR(50) NULL,[IsFirstTime]       NCHAR(10)    NULL,[StartTime]         NCHAR(10)    NULL,[FinishTime]        NCHAR(10)    NULL,[Duration]          NCHAR(10)    NULL,[Price]             FLOAT(53)    NULL,PRIMARY KEY CLUSTERED ([BookingID] ASC)
)

CREATE TABLE [dbo].[Booking] 
(
    [BookingID] INT IDENTITY (101,[DogID]     INT NOT NULL,[ClientID]  INT NOT NULL,PRIMARY KEY CLUSTERED ([BookingID] ASC),CONSTRAINT [FK_Booking_TodogInfo] 
        FOREIGN KEY ([DogID]) REFERENCES [dbo].[DogInfo] ([DogID]),CONSTRAINT [FK_Booking_ToOwner] 
        FOREIGN KEY ([ClientID]) REFERENCES [dbo].[Owner] ([ClientID]),CONSTRAINT [FK_Booking_ToBookingInfo] 
        FOREIGN KEY ([BookingID]) REFERENCES [dbo].[BookingInfo]([BookingID])
)

两个表的 sql：

    $filemanagerToken = '123456';
    $this->data['scripts_admin'] = '
    <!-- Scripts Admin -->
    <script src="//cdn.ckeditor.com/4.16.0/full/ckeditor.js"></script>
    <script src="'.base_url().'/assets/admin/post/js/post_editor.js">
        var fmKey = '.json_encode($filemanagerToken).';
    </script>';

解决方法

您的代码有很多问题：

BookingID

Booking 不应该是 IDENTITY 列，也不应该是主键（至少不是它本身），因为它只接受来自BookingInfo。您可能希望将其设为具有另一列的主键。
因此您需要从 BookingInfo 插入返回 ID，然后传递到另一个插入。

其他注意事项：

仔细选择您的数据类型：nchar 是固定长度并且会填充空格，使用 nvarchar 代替可变长度。日期应位于 date 或 datetime 列中。布尔值应该放在 bit 列中。任何涉及金钱的东西都需要在 decimal 而不是 float。
指定参数类型、长度和精度
将 SqlCommand 放入 using 块

您的 SQL 代码将如下所示：

CREATE OR ALTER PROCEDURE AddBookingInfo
    @GroomOption NCHAR(10)
.....
    @BookingInfoID int OUTPUT
AS

INSERT BookingInfo
      (GroomOption,....)
VALUES (@GroomOption,...);

SELECT CAST(SCOPE_IDENTITY() AS int);

GO

您的 C# 方面将如下所示：

public static int AddBookingInfo(string GroomOption,string Hair,string Teeth,string Nails,string DateOfAppointment,string IsFirstTime,string StartTime,string FinishTime,string Duration,double Price)
{
    using (SqlConnection connection = new SqlConnection(_connectionstring))
    using (SqlCommand insertClientCommand = new SqlCommand("AddBookingInfo",connection))
    {
        insertClientCommand.CommandType = System.Data.CommandType.StoredProcedure;

        insertClientCommand.Parameters.Add("@GroomOption",SqlDbType.VarChar,10).Value = GroomOption;
        // ......... etc

        connection.Open();
        return (int)insertClientCommand.ExecuteScalar();  // the result is the ID
    }
}

public static int AddBooking(int BookingInfoId,int DogID,int ClientID)
{
    using (SqlConnection connection = new SqlConnection(_connectionstring))
    using (SqlCommand insertClientCommand = new SqlCommand("AddBooking",connection))
    {
        insertClientCommand.CommandType = System.Data.CommandType.StoredProcedure;

        insertClientCommand.Parameters.Add("@BookingInfoID",SqlDbType.Int).Value = BookingInfoId;
        insertClientCommand.Parameters.Add("@DogID",SqlDbType.Int).Value = DogID;
        insertClientCommand.Parameters.Add("@ClientID",SqlDbType.Int).Value = ClientID;

        connection.Open();
        int rowsAffected = insertClientCommand.ExecuteNonQuery();

        connection.Close();

        return rowsAffected;
    }
}

老实说，您的数据模型似乎有些可疑：Booking 和 BookingInfo 之间有什么区别，它们代表不同的概念还是应该在同一个表中？

另外，Duration 应该是一个计算列，因为它可以从其他列中计算出来，并且当您真正想要数据在那里时，您不应该将列声明为 NULL。>

SqlException: 插入语句与外键约束冲突

如何解决SqlException: 插入语句与外键约束冲突

解决方法

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