C# BulkCopy.WriteToServer变化值

Question

我有一个数据表，它是从excel工作表创建的。我正在尝试SqlBulkCopy.WriteToServer。当我这样做时，当我的表模式对“%”列具有Decimal(38,0)类型时，它将我的“%”值转换为0。但是，当数据类型作为浮动时，它将正确插入。我不知道这是怎么回事。我想使用十进制(38，0)，如果可能的话，因为我给出的差表可能超过小数15位。

datatable是所有列的类型字符串，因为我可能必须处理空值。

以下是我的c#代码：

private bool ImportToDataBase(DataTable emeTable)
{
    string serverName = PARR_DBDataObject.ServerName;
    string dbName = PARR_DBDataObject.DBName;
    bool dataUploaded = false;

    using ( SqlConnection conn = SQL.ConnectToDB(dbName, serverName, false))
    {
        conn.Open();
        string createTempTable = $@"CREATE TABLE #Holdings(
                                        [Fund][varchar](25) NULL,
                                        [Percent] [varchar](38) NULL,
                                        [Committed] [varchar](25) NULL,
                                        [DryPowder] [varchar](25) NULL,
                                        [CashBalance] [varchar](25) NULL,
                                        [Trades] [varchar](25) NULL,
                                        [Capital] [varchar](25) NULL,
                                        [MgmtFee] [varchar](25) NULL,
                                        [Cash] [varchar](25) NULL,
                                        [ReportDate] [datetime] NULL);";
        SqlCommand cmd = new SqlCommand(createTempTable, conn);
        cmd.ExecuteNonQuery();

        using(SqlBulkCopy blkCopy = new SqlBulkCopy(conn))
        {
            decimal test = Convert.ToDecimal(emeTable.Rows[0][1]);
            foreach(DataColumn col in emeTable.Columns)
            {
                blkCopy.ColumnMappings.Add(col.Ordinal, col.Ordinal);
            }

            blkCopy.DestinationTableName = "#Holdings";
            blkCopy.WriteToServer(emeTable);

            string sqlSelect = "SELECT * FROM #Holdings";
            SqlCommand emeCmd = new SqlCommand(sqlSelect, conn);
            SqlDataAdapter da = new SqlDataAdapter(emeCmd);
            DataTable testTable = new DataTable();
            da.Fill(testTable);
            da.Dispose();
        }
        string spName = DBDataObject.sp_Insert_Into_CashHoldings;
        SqlCommand cmdSP = new SqlCommand(spName, conn);
        cmdSP.ExecuteNonQuery();

        //SQL.NonQueryStoredProcedure(spName, dbName, serverName, false, 600);
        dataUploaded = true;

    }
    return dataUploaded; 
}

下面是我从临时表中获取数据并进入主表的SQL：

ALTER PROCEDURE [dbo].[sp_Insert_Into_CashHoldings] 

AS
BEGIN
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;

    MERGE t_CashHoldings AS TARGET 
        USING #Holdings AS SOURCE
    ON (TARGET.Fund = SOURCE.Fund AND TARGET.ReportDate= SOURCE.ReportDate)
    WHEN MATCHED THEN
        UPDATE SET TARGET.Percent = SOURCE.Percent, 
                   TARGET.Committed = SOURCE.Committed,
                   TARGET.DryPowder = SOURCE.DryPowder,
                   TARGET.Trades = SOURCE.Trades,
                   TARGET.Capital = SOURCE.Capital,
                   TARGET.MgmtFee = SOURCE.MgmtFee,
                   TARGET.Cash = SOURCE.Cash
    WHEN NOT MATCHED THEN
    INSERT (Fund, Percent, Committed, DryPowder, CashBalance, Trades, Capital, MgmtFee, Cash, ReportDate)
    VALUES (SOURCE.Fund, SOURCE.Percent, SOURCE.Committed, SOURCE.DryPowder, SOURCE.CashBalance, SOURCE.Trades, SOURCE.Capital,
            SOURCE.MgmtFee, SOURCE.Cash, SOURCE.ReportDate);

    DROP TABLE #Holdings;

END

Answer 1

如果这是错误的答案，我可以删除它-但如果你做小数( 38，0)，这意味着你想要一个#，有38位在小数点的左边，并允许0在右边。你可能想要38,10，这意味着38个总数，但左边有28个，右边有10个。如果您的值存储为0.56，那么这可能就是它被切断的原因。

尽管如此，我还是建议您做28,10这样的操作，因为.NET只支持最多28次精度与server的38次比较。如果你以后想给.NET带来一个大的#，它会崩溃的。

希望这能有所帮助！