我想使用fastmember(Fastmember NuGet)扩展名和sqlbulkcopy将一定数量的自定义对象列表粘贴到我的数据库中。但是它给了我下面的错误:SqlBulkCopy无法将值NULL插入列
An unhandled exception of type 'System.Data.SqlClient.SqlException' occurred in System.Data.dll
Additional information: Cannot insert the value NULL into column 'functionblockId', table '\path...\DBFHX.MDF.dbo.connections'; column does not allow nulls. INSERT fails.
The statement has been terminated.
代码:
private void insertConnection(functionblock functionblock)
{
using (var bcp = new SqlBulkCopy(db.Database.Connection.ConnectionString))
{
foreach (connection item in functionblock.connections)
{
item.functionblockId = 1;
}
using (var creader = ObjectReader.Create(functionblock.connections, "step", "transition","steptotrans", "functionblockId"))
{
bcp.DestinationTableName = "connections";
bcp.WriteToServer(creader);
}
}
}
使用型号首先,实体框架产生如下表:
CREATE TABLE [dbo].[connections] (
[Id] INT IDENTITY (1, 1) NOT NULL,
[step] NVARCHAR (MAX) NOT NULL,
[transition] NVARCHAR (MAX) NOT NULL,
[steptotrans] BIT NOT NULL,
[functionblockId] INT NOT NULL,
CONSTRAINT [PK_connections] PRIMARY KEY CLUSTERED ([Id] ASC),
CONSTRAINT [FK_functionblockconnection] FOREIGN KEY ([functionblockId]) REFERENCES [dbo].[functionblocks] ([Id])
);
的代码工作正常,为不同表中还包含相同的“functionblockId”和相同类别的其他字段(尽管不包含位字段)。
我手动检查了所有我在functionblock.connections列表中的值,然后在具体的对象中它的'functionblockId',它都被一个数字填充。更好的是,就像你在代码中看到的那样,我实际上在我将它硬编码之前填充它进行硬编码。
我不知道为什么会出现此错误,有没有人有想法?
你必须通过使用列映射跳过标识列。您的其他表格是否没有标识列? – 2014-10-01 15:47:23
它确实有一个标识列,后来我发现如果我这样做:ObjectReader.Create(functionblock.connections,“Id”,“step”,“transition”,“steptotrans”,“functionblockId”))它也插入也没有列映射。 – usselite 2014-10-01 16:22:12