代码之家 › 专栏 › 技术社区 › Ash

sqlbackcopy writetoserver示例。我做错什么了?

sqlbulkcopy sql-server sql c#

Ash · 技术社区 · 15 年前

这可能很长,但我想解释一下我的例子

我有这个密码:

#region [parent table]
DataTable dtParent = new DataTable();
DataColumn dc;

dc = new DataColumn();
dc.DataType = System.Type.GetType("System.Int32");
dc.ColumnName = "Id";
dc.Unique = true;
dc.AutoIncrement = true;
dtParent.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = System.Type.GetType("System.String");
dc.ColumnName = "Title";
dc.Unique = false;
dtParent.Columns.Add(dc);

dtParent.TableName = "aTestSw";
dtParent.PrimaryKey = new DataColumn[] { dtParent.Columns[0] };
#endregion

#region [child table]
DataTable dtChild = new DataTable();

dc = new DataColumn();
dc.DataType = System.Type.GetType("System.Int32");
dc.ColumnName = "Id";
dc.Unique = true;
dc.AutoIncrement = true;
dtChild.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = System.Type.GetType("System.Int32");
dc.ColumnName = "ParentId";
dc.Unique = false;
dtChild.Columns.Add(dc);

dc = new DataColumn();
dc.DataType = System.Type.GetType("System.String");
dc.ColumnName = "Description";
dc.Unique = false;
dtChild.Columns.Add(dc);

dtChild.TableName = "aTestSwChild";
dtChild.PrimaryKey = new DataColumn[] { dtChild.Columns[0] };
#endregion

DataSet DataSet1 = new DataSet();
DataSet1.Tables.Add(dtParent);
DataSet1.Tables.Add(dtChild);

#region [fk]
DataColumn parentColumn = dtParent.Columns["Id"];
DataColumn childColumn = dtChild.Columns["ParentId"];
DataRelation relParentChild = new DataRelation("ParentChild", 
    parentColumn, childColumn);
DataSet1.Relations.Add(relParentChild); 
#endregion

#region [fill parent]
DataRow dr2saveIn = dtParent.NewRow();
dr2saveIn["Title"] = "a";
dtParent.Rows.Add(dr2saveIn);

dr2saveIn = dtParent.NewRow();
dr2saveIn["Title"] = "b";
dtParent.Rows.Add(dr2saveIn);
#endregion

#region [fill child]
dr2saveIn = dtChild.NewRow();
dr2saveIn["Description"] = "c";
dr2saveIn["ParentId"] = dtParent.Rows[0]["Id"];
dtChild.Rows.Add(dr2saveIn);

dr2saveIn = dtChild.NewRow();
dr2saveIn["Description"] = "d";
dr2saveIn["ParentId"] = dtParent.Rows[1]["Id"];
dtChild.Rows.Add(dr2saveIn);   
#endregion

SqlBulkCopy bulkCopy = new SqlBulkCopy(
    "server=aaa;database=bbb;uid=ccc;password=ddd", 
    SqlBulkCopyOptions.TableLock);
bulkCopy.DestinationTableName = "dbo.aTestSw";
bulkCopy.WriteToServer(dtParent);
bulkCopy.DestinationTableName = "dbo.aTestSwChild";
bulkCopy.WriteToServer(dtChild);

当我运行它时,在子表的fk列中得到了“看起来”正确的数据。(0和1) 问题是,保存之后,数据会进入数据库,但这并不好。我没有从父表中得到fk id,而是从C代码中得到0和1。注意:数据库中的表上确实有FK约束。您不能手动添加这些内容,但sqlbackcopy writetoserver没有问题,无论如何都会写入错误的数据(就像没有检查约束一样)

看表格:

CREATE TABLE [dbo].[aTestSw](
 [Id] [int] IDENTITY(1,1) NOT NULL,
 [Title] [varchar](100) COLLATE SQL_Latin1_General_CP1_CI_AS NULL,
 CONSTRAINT [PK_aTestSw] PRIMARY KEY CLUSTERED 
(
 [Id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]


CREATE TABLE [dbo].[aTestSwChild](
 [Id] [int] IDENTITY(1,1) NOT NULL,
 [ParentId] [int] NOT NULL,
 [Description] [varchar](50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL,
 CONSTRAINT [PK_aTestSwChild] PRIMARY KEY CLUSTERED 
(
 [Id] ASC
)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]

ALTER TABLE [dbo].[aTestSwChild]  WITH NOCHECK ADD  CONSTRAINT [FK_aTestSwChild_aTestSw] FOREIGN KEY([ParentId])
REFERENCES [dbo].[aTestSw] ([Id])

ALTER TABLE [dbo].[aTestSwChild] CHECK CONSTRAINT [FK_aTestSwChild_aTestSw]

结果如下:

select * from aTestSw

Id          Title
16          a
17          b

select * from aTestSwChild

Id          ParentId    Description
12          0           c
13          1           d

我做错什么了? 也许我不应该在C里得到这样的身份证。但是如何呢? 还是可能?我的意思是,我的第二个BulkInsert如何知道SQL!!!!身份证在插入?

2 回复 | 直到 12 年前

masoud ramezani 15 年前

使用此选项:

SqlBulkCopyOptions.KeepIdentity

在执行大容量复制操作之前,请将数据库的checkConstraints设置为off。在此之后,使用大容量复制插入数据。完成所有工作后,将checkConstraints设置为on。

upside选项强制数据库保留您的标识值。

jhilden 12 年前

默认情况下,sqlblkcopy会将您的外键转换为nocheck外键。您需要添加选项 SqlBulkCopyOptions.CheckConstraints 为了保持您的外键检查所有现有和所有新数据。