给定的ColumnMapping与源或目标中的任何列都不匹配

Question

我不知道为什么我得到上述异常,请有人看看它....

DataTable DataTable_Time = new DataTable("Star_Schema__Dimension_Time");

DataColumn Sowing_Day = new DataColumn();
Sowing_Day.ColumnName = "Sowing_Day";

DataColumn Sowing_Month= new DataColumn();
Sowing_Month.ColumnName = "Sowing_Month";      

DataColumn Sowing_Year = new DataColumn();
Sowing_Year.ColumnName = "Sowing_Year";

DataColumn Visit_Day= new DataColumn();
Visit_Day.ColumnName = "Visit_Day";

DataColumn Visit_Month = new DataColumn();
Visit_Month.ColumnName = "Visit_Month";

DataColumn Visit_Year = new DataColumn();
Visit_Year.ColumnName = "Visit_Year";

DataColumn Pesticide_spray_day = new DataColumn();
Pesticide_spray_day.ColumnName = "Pesticide_spray_day";

DataColumn Pesticide_spray_Month = new DataColumn();
Pesticide_spray_Month.ColumnName = "Pesticide_spray_Month";

DataColumn Pesticide_spray_Year = new DataColumn();
Pesticide_spray_Year.ColumnName = "Pesticide_spray_Year";

DataTable_Time.Columns.Add(Pesticide_spray_Year);
DataTable_Time.Columns.Add(Sowing_Day);
DataTable_Time.Columns.Add(Sowing_Month);
DataTable_Time.Columns.Add(Sowing_Year);
DataTable_Time.Columns.Add(Visit_Day);
DataTable_Time.Columns.Add(Visit_Month);
DataTable_Time.Columns.Add(Visit_Year);
DataTable_Time.Columns.Add(Pesticide_spray_day);
DataTable_Time.Columns.Add(Pesticide_spray_Month);

adapter.SelectCommand = new SqlCommand(
    "SELECT SowingDate,VisitDate,PesticideSprayDate " +
    "FROM Transformed_Table " + 
    "group by SowingDate,VisitDate,PesticideSprayDate", con);

adapter.SelectCommand.CommandTimeout = 1000;

adapter.Fill(DataSet_DistinctRows, "Star_Schema__Dimension_Time");

DataTable_DistinctRows = DataSet_DistinctRows.Tables["Star_Schema__Dimension_Time"];

int row_number = 0;
int i = 3;

foreach(DataRow row  in DataTable_DistinctRows.Rows)
{
    DataRow flatTableRow = DataTable_Time.NewRow();

    string[] Sarray= Regex.Split(row[0].ToString()," ",RegexOptions.IgnoreCase);
    string[] finalsplit = Regex.Split(Sarray[0], "/", RegexOptions.IgnoreCase);
    string[] Sarray1 = Regex.Split(row[1].ToString(), " ", RegexOptions.IgnoreCase);
    string[] finalsplit2 = Regex.Split(Sarray1[0], "/", RegexOptions.IgnoreCase);
    string[] Sarray2= Regex.Split(row[2].ToString(), " ", RegexOptions.IgnoreCase);
    string[] finalsplit3 = Regex.Split(Sarray2[0], "/", RegexOptions.IgnoreCase);             

    flatTableRow["Sowing_Day"] = int.Parse(finalsplit[0]);
    flatTableRow["Sowing_Month"] = int.Parse(finalsplit[0]);
    flatTableRow["Sowing_Year"] = int.Parse(finalsplit[0]);

    flatTableRow["Visit_Day"] = int.Parse(finalsplit2[0]);
    flatTableRow["Visit_Month"] = int.Parse(finalsplit2[0]);
    flatTableRow["Visit_Year"] = int.Parse(finalsplit2[0]);

    flatTableRow["Pesticide_spray_day"] = int.Parse(finalsplit3[0]);
    flatTableRow["Pesticide_spray_Month"] = int.Parse(finalsplit3[0]);
    flatTableRow["Pesticide_spray_Year"] = int.Parse(finalsplit3[0]);

    DataTable_Time.Rows.Add(flatTableRow);

    i++;
}

con.Open();

using (SqlBulkCopy s = new SqlBulkCopy(con))
{
    s.DestinationTableName = DataTable_Time.TableName;

    foreach (var column in DataTable_Time.Columns)
        s.ColumnMappings.Add(column.ToString(), column.ToString());

    s.BulkCopyTimeout = 500;

    s.WriteToServer(DataTable_Time);
}

Answer 1

请记住,对于某些版本的SQL,sqlBulkCopy列区分大小写非常重要.我认为MSSQL 2005.希望它有所帮助

Answer 2

一个原因是SqlBulkCopy区分大小写.按照步骤:

1. 使用ContainsC#中的方法在源表中查找列.
2. 目标列与源列匹配后,获取该列的索引并将其名称赋予SqlBulkCopy.

例如:

//Get Column from Source table 
string sourceTableQuery = "Select top 1 * from sourceTable";

// i use sql helper for executing query you can use corde sw
DataTable dtSource 
    = SQLHelper.SqlHelper
        .ExecuteDataset(transaction, CommandType.Text, sourceTableQuery)
        .Tables[0];

for (int i = 0; i < destinationTable.Columns.Count; i++)
{
    string destinationColumnName = destinationTable.Columns[i].ToString();

    // check if destination column exists in source table 
    // Contains method is not case sensitive    
    if (dtSource.Columns.Contains(destinationColumnName))
    {
        //Once column matched get its index
        int sourceColumnIndex = dtSource.Columns.IndexOf(destinationColumnName);

        string sourceColumnName = dtSource.Columns[sourceColumnIndex].ToString();

        // give column name of source table rather then destination table 
        // so that it would avoid case sensitivity
        bulkCopy.ColumnMappings.Add(sourceColumnName, sourceColumnName);
    }                               
}

bulkCopy.WriteToServer(destinationTable);
bulkCopy.Close();

Answer 3

1. 确保提供ColumnMappings

2. 确保源列名称的所有值均有效且区分大小写。

3. 确保目标列名称的所有值均有效且区分大小写。

4. 使源大小写不敏感

Answer 4

除了上面各种答案中提到的区分大小写之外。检查您是否确实具有相同的列，并且您没有偶然错过任何列。我的一位同事就遇到过这种情况，他缺少 87 列中的一列。因此，只需仔细检查目的地中是否也有源中的每一列。

Answer 5

问题在于s.ColumnMappings.Add(column.ToString(), column.ToString());目标表和源表的映射。DataTable 中至少有一列与目标表不匹配。

原因有很多，但其中之一可能是数据类型不匹配。因此，如果您尝试将文本插入到整数列中。