使用SqlBulkCopy插入数据时出错

Question

我正在尝试使用批量插入数据到SQL 2008 SqlBulkCopy.

这是我的表:

IF OBJECT_ID(N'statement', N'U') IS NOT NULL
DROP TABLE [statement]
GO
CREATE TABLE [statement](
  [ID] INT IDENTITY(1, 1) NOT NULL,
  [date] DATE NOT NULL DEFAULT GETDATE(),
  [amount] DECIMAL(14,2) NOT NULL,
CONSTRAINT [PK_statement] PRIMARY KEY CLUSTERED
(
    [ID] ASC
) WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO

这是我的代码:

private DataTable GetTable()
{
    var list = new List<DataColumn>();
    list.Add(new DataColumn("amount", typeof(SqlDecimal)));
    list.Add(new DataColumn("date", typeof(SqlDateTime)));

    var table = new DataTable("statement");
    table.Columns.AddRange(list.ToArray());

    var row = table.NewRow();
    row["amount"] = (SqlDecimal)myObj.Amount; // decimal Amount { get; set; }
    row["date"] = (SqlDateTime)myObj.Date; // DateTime Date { get; set }
    table.Rows.Add(row);

    return table;
}

private void WriteData()
{
    using (var bulk = new SqlBulkCopy(strConnection, SqlBulkCopyOptions.KeepIdentity & SqlBulkCopyOptions.KeepNulls))
    {
        //table.Columns.ForEach(c => bulk.ColumnMappings.Add(new SqlBulkCopyColumnMapping(c.ColumnName, c.ColumnName)));
        bulk.BatchSize = 25;
        bulk.DestinationTableName = "statement";
        bulk.WriteToServer(GetTable()); // a table from GetTable() 
    }
}

所以我收到错误:

SqlDateTime数据源中给定的类型值无法转换为date指定目标列的类型.

为什么？？我该如何解决这个问题？请帮帮我!

Answer 1

使用原始表脚本,以下代码有效.

private static DataTable GetTable()
{
    var list = new List<DataColumn>();
    list.Add(new DataColumn("amount", typeof(Double)));
    list.Add(new DataColumn("date", typeof(DateTime)));
    var table = new DataTable("statement");
    table.Columns.AddRange(list.ToArray());

    var row = table.NewRow();
    row["amount"] = 1.2d;
    row["date"] = DateTime.Now.Date;

    table.Rows.Add(row);
    return table;
}
private static void WriteData()
{
    string strConnection = "Server=(local);Database=ScratchDb;Trusted_Connection=True;";
    using (var bulk = new SqlBulkCopy(strConnection, SqlBulkCopyOptions.KeepIdentity & SqlBulkCopyOptions.KeepNulls))
    {
        bulk.ColumnMappings.Add(new SqlBulkCopyColumnMapping("amount", "amount"));
        bulk.ColumnMappings.Add(new SqlBulkCopyColumnMapping("date", "date"));
        bulk.BatchSize = 25;
        bulk.DestinationTableName = "statement";
        bulk.WriteToServer(GetTable());
    }
}

正如Amal所说,由于Identity列,您需要列映射.

Answer 2

SQL Date类型与SQL DateTime类型不同.我认为表中的日期列需要是DateTime类型,具体取决于您使用它的方式.

SQL日期类型
SQL DateTime类型

更新:

我认为Marc的答案应该有效,但是你可能需要从源DataTable到目的地指定SqlBulkCopyColumnMappings,否则可能会导致映射错误,因为输入表的结构与输出表完全不匹配,即日期顺序和行列交换.

例如

var amount = new SqlBulkCopyColumnMapping("amount", "amount");
var date = new SqlBulkCopyColumnMapping("date", "date");
bulk.ColumnMappings.Add(amount);
bulk.ColumnMappings.Add(date);