C＃BulkCopy.WriteToServer更改值

Question

我有一个从Excel表创建的数据表。我正在尝试SqlBulkCopy.WriteToServer。当我这样做时，当我的表架构的“百分比”列的类型为Decimal（38,0）时，它将“百分比”值转换为0。但是，当我将数据类型设置为Float时，它可以正确插入。我不确定发生了什么。如果可能的话，我想使用Decimal（38，0），因为给出的电子表格可能会超过15个小数位。

数据表是所有列的字符串类型，因为我可能不得不处理空值。

这是我的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; 
}

这是我的SQL，用于从临时表中获取数据并进入主表：

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