Question

如何在执行SQL Server事务时阻止以下错误？

我正在尝试将SupplierOrder和VehicleRecord添加到一组两个数据库表中。我正在使用以下内容：

表SQL结构：

CREATE TABLE VSI_VehicleRecords
(
    VehicleRecordID INT IDENTITY(1,1) PRIMARY KEY,
    StockNumber INT NOT NULL,
    Status INT NOT NULL,
    Make VARCHAR(50) NOT NULL,
    Model VARCHAR(50) NOT NULL,
    Colour VARCHAR(50) NOT NULL,
    Spefication VARCHAR(255) NOT NULL
)

CREATE TABLE VSI_SupplierOrders
(
    SupplierOrderID INT IDENTITY(1,1) PRIMARY KEY,
    VehicleRecordID INT FOREIGN KEY REFERENCES VSI_VehicleRecords(VehicleRecordID) UNIQUE,
    Timestamp
)

我编写了一个实用程序方法，它将一组Sql查询作为事务运行：

C＃执行交易：

    SqlTransaction _Transaction;
    OpenConnection();

    _Transaction = __Connection.BeginTransaction();

    try
    {
        for (int i = 0; i < Commands.Length; i++)
        {
            Commands[i].Connection = __Connection;
            Commands[i].Transaction = _Transaction;
            Commands[i].ExecuteNonQuery();
        }
        _Transaction.Commit();
        return true;
    }
    catch (SqlException e)
    {
        _Transaction.Rollback();
    }

上述函数要执行的SQL命令：

    SqlCommand[] _Commands = new SqlCommand[2];

    string _InsertVehicleQuery = "INSERT INTO VSI_VehicleRecords(StockNumber,Status,Make,Model,Colour,Spefication) VALUES (@StockNumber, @Status, @Make, @Model, @Colour, @Specification);";

    SqlCommand _InsertVehicleCommand = new SqlCommand(_InsertVehicleQuery);
    _InsertVehicleCommand.Parameters.AddWithValue("@StockNumber", __StockNumber);
    _InsertVehicleCommand.Parameters.AddWithValue("@Status", __Status);
    _InsertVehicleCommand.Parameters.AddWithValue("@Make", Make);
    _InsertVehicleCommand.Parameters.AddWithValue("@Model", Model);
    _InsertVehicleCommand.Parameters.AddWithValue("@Colour", Colour);
    _InsertVehicleCommand.Parameters.AddWithValue("@Specification", Specification);

    _Commands[0] = _InsertVehicleCommand;

    string _InsertSupplierOrderQuery = "INSERT INTO VSI_SupplierOrders(VehicleRecordID) VALUES (@VehicleRecordID);";
    SqlCommand _InsertSupplierOrderCommand = new SqlCommand(_InsertSupplierOrderQuery);
    _InsertSupplierOrderCommand.Parameters.AddWithValue("@VehicleRecordID", _VehicleRecordID);

    _Commands[1] = _InsertSupplierOrderCommand;

    DataUtility.NonQueryTransaction(_Commands);

但是我收到以下错误：

* INSERT语句与FOREIGN KEY约束“FK__VSI_Suppl_ Vehic _5165187F”冲突。冲突发生在数据库中 “jack_test”，表“dbo.VSI_VehicleRecords”，列'VehicleRecordID'。*

Answer 1

您需要从第一个查询中获取VehicleRecordID - 您当前没有将_VehicleRecordID设置为任何值

为此，您需要在插入SQL后附加;SELECT Scope_Identity()并通过ExecuteScalar执行命令

但是，创建一个存储过程可能更容易和更简洁，该存储过程接受两个查询的所有参数并在SQL Server上完成工作

例如

create proc CreateRecordAndSupplier
(
     @Stocknumber int,
     ... (etc)
)
as
begin
declare @VR int
      INSERT INTO VSI_VehicleRecords(StockNumber,Status,Make,Model,Colour,Spefication) 
      VALUES (@StockNumber, @Status, @Make, @Model, @Colour, @Specification);

      select @VR = Scope_Identity();

      INSERT INTO VSI_SupplierOrders(VehicleRecordID) VALUES (@VR) 
end

事务外键原因：“INSERT语句与FOREIGN KEY约束冲突”

表SQL结构：

C＃执行交易：

上述函数要执行的SQL命令：

1 个答案: